JPH0428352Y2

JPH0428352Y2 -

Info

Publication number: JPH0428352Y2
Application number: JP1985094757U
Authority: JP
Priority date: 1985-06-21
Filing date: 1985-06-21
Publication date: 1992-07-09
Also published as: JPS622728U

Description

【考案の詳細な説明】〔産業上の利用分野〕本考案は建築、構築物の内、外装の横張り壁体
を形成し、かつ、縦目地をコーキング材によつて
密封した構造とするのに有用なサイデイングボー
ド（以下、単にボードという）に関するものであ
る。〔従来の技術〕従来から使用されているこの種ボードとして
は、例えば特公昭51−29339号、実公昭51−
11882号、実公昭54−26649号などがある。しか
しながら、この種ボードにおいて最大の欠点は化
粧面が山状になり、これを用いて形成した壁体は
連続した山のような外観となることであつた。ま
た、この種ボードは化粧面が設計上、平坦（エン
ボス加工も含む）であり、かつ、単なる段差、凹
凸にすぎず立体感に欠ける不利があつた。その
他、この種ボードにおいては、落とし込み型の連
結構造としたボードも知られているが、立体感、
防水性、断熱性、施工性、経済性に欠ける不利が
あつた。その上、表面材として厚さ0.27〜0.36mm
程度のカラ−鋼板等を用い、芯材として合成樹脂
発泡体を用いたボードによつて形成された壁体で
は、縦目地β′に第５図ｂに示すようにバツクアツ
プ材２５とコーキング材２６を充填する必要があ
つた。しかしながらコーキング材２６は微小面積
の表面材の端部とのみ接着しているにずぎず、合
成樹脂発泡体を接着しているコーキング材２６の
部分は接着強度にほとんど寄与しないものであ
る。その結果、コーキング材２６は表面材の僅か
な木口面との接着にすぎず、外力、または耐候的
劣化によつて容易に破損したり、充填作業に熟練
を必要とし、かつ、外観を美しくしあげなければ
ならず、施工に長時間を要する等の不利があつ
た。さらに、この種ボードは連続ラインで生産さ
れ、走行カツタで切断されるため、その木口が長
尺化粧面の端面側で変形、所謂木口付近が圧縮さ
れて変形した状態（前ダレ）が生ずる不利があつ
た。〔考案の目的〕本考案は上述したような欠点を除去するため、
化粧面部を側面、傾斜面からほぼ三角形状に形成
した化粧溝により複数の水平な化粧片に分割し、
かつ、化粧溝の傾斜面と雄型連結部に設けた傾斜
片とによつて鏡面反射と乱反射の関係で外観上、
化粧片が浮き出して見えるようにして立体感を強
化し、かつ、化粧溝の側面と傾斜面との中間に窪
部を形成してボードを連結した際の目地部の外観
と化粧溝の外観を酷似したものとして、壁体に統
一した立体感に富んだ横のラインを生み出し、美
しい外観とする共に、化粧面部の反り、捩じれ、
ペコツキを防止し、ボードを広幅に形成して経済
性、施工性を改善すると共に、化粧面部の一側縁
に雄型連結部、他端に雌型連結部を形成し、か
つ、化粧溝の側面と雌型連結部の側壁の高さをほ
ぼ同一とし、壁体を形成したときに化粧面部が陰
影により立体的に見えるようにし、その上、雄型
連結部の差込縁の上側には毛細管現象の阻止と雨
返しを図る溝部を形成して連結部の防水性を向上
し、また化粧面部、および雄型連結部の傾斜片の
短尺方向の側端縁の少なくとも一方を内方に折り
曲げて端面壁を形成し、ボードを付き合わせる縦
目地部の形成を容易に、かつ、美しくし、縦目地
に対するコーキング材の植設を極めて容易に、短
時間で、しかも仕上がり面を美しく、さらに接着
力を十分に発揮できるようにし、芯材が露出した
り、コーキング材が破損したりしないようにし、
かつ、ボードの施工を容易に１人の作業員で、し
かも熟練を要さずに行うことのできる落とし込み
タイプとしたボードを提案するものである。〔考案の構成〕以下に図面を用いて本考案に係るボードの代表
的な実施例を詳細に説明する。すなわち、第１図
は上記ボードＡを示す斜視図であり、例えば表面
処理鋼板、亜鉛・ニツケル合金メツキ鋼板、アル
ミ・亜鉛合金メツキ鋼板（商品名ガルフアン、ガ
ルバリウム鋼板、スーパージンク）、アルミニウ
ム板、アルミニウム合金板、銅板、クラツド鋼
板、制振鋼板等の１種からなる金属板（平板、エ
ンボス加工板も含む）、または合成樹脂板をロー
ル、プレス、あるいは押出成形などの１種により
成形した表面材１と、表面材１の裏面に充填した
芯材２３と、芯材２３の裏面を被覆したシート状
の裏面材２４とからサンドイツチ状に構成したも
のである。すなわち、表面材１は第２図に示すよ
うに、化粧面部２、雄型連結部７、雌型連結部１
６とから構成したものである。さらに説明する
と、化粧面部２はボードＡの長手方向に沿つて少
なくとも１本以上形成した化粧溝３と化粧溝３に
よつて複数に分割された化粧片２ａ，２ｂとから
形成するものである。この化粧溝３は化粧片２ａ
とθ₁（θ₁≒90°）で交わる側面４と、化粧片２ｂと
θ₂（θ₂≦90°）で交わる傾斜面５とから断面をほぼ
三角形状に形成すると共に、側面４と傾斜面５と
の中間に窪部６を形成したものである。さらに化
粧溝３は化粧面部２の中央に１本、あるいは化粧
面部２を３〜５分割するように複数本配列したも
のであり、主に化粧面部２の反り、捩じれ、ペツ
コキを防止すると共に、化粧片２ｂ：傾斜面５が
１：５〜５：１位の割合とし、従前の化粧リブと
異なる大きな陰影を醸し出して化粧面部２の立体
感を強化する、所謂化粧片２ａ，２ｂと傾斜面５
と化粧溝３間の鏡面反射、乱反射のコントラスト
によつて凹凸感を醸し出すと共に、第３図に示す
ように横目地αの断面と化粧溝３の断面とを同じ
か、それに近い断面としてボードＡ間の目地部を
化粧溝化して壁体の意匠性を向上するものであ
る。雄型連結部７は化粧面部２の一端を前記した
化粧溝３の傾斜面５の角度θ₂とほぼ同じ角度θ₃で
屈曲した傾斜片８と、その端縁を外方に化粧片２
ａ，２ｂとほぼ平行に突出した差込縁９と、差込
縁９の先端を内方に折り曲げ、次に外方に屈曲し
て断面をほぼＵ字状に形成した係合溝１２と、係
合溝１２の下縁１３を外方へ突出した延長部１４
と、必要に応じて延長部１４の先端をはぜ状に屈
曲した舌片１５とから形成したものである。さら
に詳しく説明すると、傾斜片８は化粧溝３の傾斜
面５と化粧片２ｂとの角度θ₂に相応する角度θ₃で
傾斜して屈曲するため、雨水の流れをよくし、目
地部に雨水が貯留するのを防止すると共に、目地
部の立体感を助長し、かつ、働き幅を増大するの
に役立つものである。また、差込縁９の上面には
ボードＡの長手方向と平行に窪ませた溝部１０
と、先端に設けた補強リブ（図ではパイプ状）１
１とを形成する。この差込縁９は後述する嵌合溝
２０に嵌合し、また係合溝１２は嵌合溝２０の下
縁１９を挿入してボードＡの連結構造を２重と
し、係合力、防水性、気密性を向上するものであ
る。また、連結構造内には溝部１０によつて空〓
が形成されるため、毛細管現象が防止されると共
に、補強リブ１１が連結構造内の雨返しの機能を
果たすため、防水性が大幅に向上する。また舌片
１５は延長部１４の先端の波打ちを防止すると共
に、作業の際、延長部１４の端部による負傷を阻
止するものである。雌型連結部１６は化粧面部２
の下端を内方へ化粧溝３の側面４の角度θ₁に相応
した角度θ₄で屈曲した側壁７と、その下端を内方
へ屈曲して上縁１８とし、上縁１８の先端を外方
に折り曲げて下縁１９とし断面Ｕ字状に形成した
嵌合溝２０と、下縁１９の先端をはぜ状に屈曲し
た舌片２１とから形成したものである。さらに説
明を加えると、下縁１９は、第３図に示すよう
に、差込縁９を嵌合溝２０に嵌合する際に係合溝
１２に挿入され、ボードＡの連結構造を２重と
し、より係合力、防水性を強化するのに役立つも
のである。また、舌片２１は第１図に示すように
上はぜ状に形成し、裏面材２４の一端縁を挟持し
たり、また、下はぜ状に屈曲することも可能であ
る。また、２２は端面壁で化粧片２ａ，２ｂ、お
よび傾斜面５、傾斜片８の短尺方向の側端の少な
くとも一方を垂直に、または任意角度、例えば30
〜150°位に傾斜して屈曲して形成したものであ
る。この端面壁２２は化粧片２ａ，２ｂ、および
傾斜面５、傾斜片８の反り、捩じれ、前ダレを防
止するための補強と、第５図ａに示すようにコー
キング材２６との接着面として機能すると共に、
ボードＡの端面側からの雨水、熱、太陽光線の浸
入を遮断して後述する芯材２３を保護するのに役
立つものである。さらに説明を加えると、端面壁
２２はボードＡの木口の変形を防止することによ
り、ボードＡの端縁が直線状となり、美観性を向
上させると共に、第５図ａに示すように縦目地β
においてコーキング材２６との有効接着面積を大
きくすることにより、コーキング材２６の防水、
パツキング機能を十分に発揮させ、かつ、振動等
によるコーキング材２６の剥離を発生しにくくす
るものである。なお、端面壁２２は化粧片２ａ，
２ｂ、および傾斜面５、傾斜片８のそれぞれに設
けるものであり、またその形状は窪部６、係合溝
１２、嵌合溝２０にかからないような形状で、芯
材２３の裏面より突出しない範囲で任意形状に形
成することができる。芯材２３は表面材１の裏面
の化粧面部２、雄型連結部７、雌型連結部１６に
よつて囲まれた樋状部分に少なくとも充填し、主
にボードＡに断熱性を付与するものであり、副次
的に接着性、不燃材、クツシヨン材、防音材など
の機能を有する素材の１種からなるものである。
具体的には合成樹脂発泡体、ロツクウール、グラ
スウール、シージングボード、石膏ボード、木毛
セメント板等からなり、原料で吐出し、成形、硬
化、自己接着させるもの、あるいは成形体などの
１種からなるものである。なお、成形体を用いる
場合には芯材２３と表面材１、裏面材２４間に接
着剤（図示せず）が必要である。さらに説明する
と、芯材２３としては主に合成樹脂発泡体を用
い、例えばポリウレタンフオーム用樹脂、フエノ
ールフオーム用樹脂、ポリイソシアヌレートフオ
ーム用樹脂、およびこれらに難燃剤、難燃助剤
（硼砂、メタ硼酸ソーダ、三酸化アンチモン、炭
酸カルシウム、水酸化アルミニウム）、ベントナ
イト、パーライト粒、シラスバルーンの１種以上
を添加したものなどからなるものである。また、
芯材２３の裏面には雌型連結部近傍に凹部２３ａ
を設ける。この凹部２３ａはボードＡを連結した
際の連結部のガタ、段差を防止し、壁体の美観性
を損なわないようにするためのものである。２４
は裏面材で少なくとも芯材２３の裏面を覆つてボ
ードＡをサンドイツチ構造体とし、ボードＡ自体
の機械強度を向上すると共に、不燃シート、防水
膜、遮熱シート、吸水シート、防音シート、パツ
キング材などの機能として役立つものであり、例
えばアスベスト紙、クラフト紙、アスフアルトフ
エルト、金属箔（Al、Fe、Pb、Cu）、合成樹脂
シート、ゴムシート、布シート、石膏紙、水酸化
アルミ紙、ガラス繊維不織布等の１種、または２
種以上をラミネートしたもの、あるいは防水処
理、難燃処理されたシートなどからなるものであ
る。ここで上記各部の大きさについて簡単に説明す
る。第１図、および第２図に示すように化粧片２
ｂ，２ａの長さをそれぞれL₁，L₂、傾斜面５の
範囲をW₁、傾斜片８の範囲をW₂、差込縁９の先
端から係合溝１２の最奥までの距離をl₁、差込縁
９の先端から溝部１０の傾斜片８の端部までの距
離をl₂、係合溝１２の最奥から延長部１４の端縁
までの距離をl₃、嵌合溝２０の最奥から下縁１９
の先端までの距離をl₄、嵌合溝２０の最奥から側
壁１７の下端までの距離をl₅、凹部２３ａの範囲
をl₆、側面４の高さをh₁、側壁１７の高さをh₂、
化粧片２ａ，２ｂから芯材２３の裏面までの高さ
をh₃、h₄とすると、l₁≒l₄，l₂≦l₅，l₃≒l₆，h₁≒
h₂，h₃≒h₄であり、またL₁：W₁＝１：５〜５：
１，L₂：W₂＝１：５〜５：１の関係にある。す
なわち、上記関係は、ボードＡを連結した際、化
粧溝３と目地部が酷似した外観となり、壁体に統
一したラインを生み、意匠性に富む壁体を形成
し、また傾斜面５、傾斜片８と化粧片２ａ，２ｂ
の鏡面反射、乱反射によりボードの立体感が向上
するためのものである。なお，L₁，L₂、および
W₁，W₂はL₁≒L₂，W₁≒W₂であることが望まし
いが、必要に応じて、L₁＞L₂またはL₁＜L₂，W₁
＞W₂またはW₁＜W₂、すなわちL₁：W₁≠L₂：
W₂のような関係とすることも可能である。ここで、本考案に係るボードＡと従来のボード
A′とを比較してみる。実施例として第１図に示
すように表面材１としてカラー鋼板（板厚0.27
mm）を用い、化粧片２ｂ：傾斜面５、化粧片２
ａ：傾斜片８を５：２の割合で形成し、芯材２３
はポリイソシアヌレートフオームを原料状態で吐
出し、反応、発泡させて密度30Kg／m³に形成し、
裏面材２４としてアルミ・クラフト紙を用意して
第１図に示すようなボードＡを製造した。これに
対し、比較例として第４図に示すような端面壁２
２のないボードA′を成形した。なお、比較例は、
長さ、厚さ、材料は実施例と同じものを用いた。
この両ボードＡ，A′に対し、次のような各種テ
ストを行つた。すなわち○イ湿熱、乾燥試験、○ロ芯
材２３の密度バラツキ試験、○ハ縦目地β，β′（第
５図ａ，ｂに示し、実施例はａ、比較例はｂのよ
うに形成した）の防水試験、○ニコーキング材２６
充填時の作業性、○ホ製造した後での外観観察、○ヘ
不良品率（木口の外観からみて）の測定、○ト切断
時における変形の測定を行つた。その結果は次表
のようになつた。なお、○イは80±５℃で、105分
で乾燥し、90％RHで２時間放置した後の各化粧
片の中心における平面からの高さ（凸状を＋、凹
状を−とする）、○ロは芯材２３の密度が全幅に亘
つて略一定とした際と、大きく変動した際であ
り、前者としては30〜33Kg／m³、後者としては20
〜40Kg／m³でボイドも多く見られる発泡組織の時
の化粧面部２の外観、○ハは縦目地β，β′に対し、
70Kgｆの圧力で水を噴射したときの裏面への漏水
と縦目地β，β′の破損状態、○ニは同一長さ、幅に
対する充填時間、○ホはボードＡ，A′の全体観察、
○ヘは木口面が原因で不良となるボードＡ，A′の
割合、○トは切断により生ずる前ダレによる変形で
ある。【表】【表】なお、，は化粧面部の高さが１mmだけ増減
すると裏面材２４の幅方向に対する収縮、または
伸びは12mmとなる。は木口に芯材２３の発泡組
織が露出し、充填不良、発泡組織の不均一がみえ
るためである。〔施工例〕いま、第１図に示すようなボードＡを第３図に
示すように横張りして壁体を形成すると仮定す
る。なお、ボードA₁，A₂は表面材１に0.27mm厚
のカラー鋼板を用い、裏面材２４にはアルミ・ク
ラフト紙を用い、芯材２３は表面材１と裏面材２
４の間にポリイソシアヌレートフオーム用原料を
吐出し、反応、発泡させ、次にキユアして一体化
したものである。そこで、主柱、間柱、防水シー
ト等からなる壁下地（図では防水シートを使用し
ない場合の壁下地を示す）２７に第ｎ段目のボー
ドA₁の延長部１４を釘２８を介して固定する。
次に第ｎ＋１段目のボードA₂の雌型連結部１６
の嵌合溝２０をボードA₁の雄型連結部７の差込
縁９に嵌挿し、第３図のような横目地αを形成す
るものである。また縦目地βはボードＡの短尺方
向の側端縁を突き合わせることにより、第５図ａ
に示すように形成する。すなわち、縦目地βにバ
ツクアツプ材２５を挿入し、その後でコーキング
材２６を化粧面部２から突出しないように充填す
ればよいものである。このようにして形成した縦
目地βは、従前の横張り用ボードの縦目地（第５
図ｂに示す）β′と異なり、表面材１とコーキング
材２６との接着面積が大きいため、防水性、施工
性、耐振性にすぐれたものとなる。なお、土台部
分にはスタータ（図示せず）、出、入隅等の部分
（図示せず）にはコーキング材、役物を用いる必
要がある。〔その他の実施例〕以上説明したのは本考案に係るボードＡの一実
施例にすぎず、第６図ａ〜ｉ〜第１１図ａ〜ｎに
示すように形成することもできる。すなわち、第
６図ａ〜ｉは化粧溝３の変形例であり、ａ，ｂ図
は化粧片２ａと側面４、または側面４と窪部６と
の中間に立体感の強化を図る面取り面３ａを設け
た化粧溝３、ｃ図はθ₁を鋭角、または図示しない
が鈍角に形成した化粧溝３、ｄ〜ｈ図は窪部６の
形状を変形した化粧溝３、ｉ図は窪部６を除去し
た化粧溝３である。また第７図ａ〜ｒは雄型連結
部７のその他の実施例であり、ａ図は舌片１５を
下はぜ状に形成した雄型連結部７、ｂ，ｃ図は延
長部１４に段差を設けた雄型連結部７、ｄ図は下
縁１３に対し係合溝１２の上縁１２ａを角度θ₅と
なるように形成した雄型連結部７、ｅ図は差込縁
９全体を上方に傾斜した雄型連結部７、ｆ図は延
長部１４、または下縁１３に長手方向と平行に突
条１４ａを形成した雄型連結部７、ｇ図は延長部
１４、または下縁１３に凹条１４ｂを形成した雄
型連結部７、ｈ，ｉ図は突条１４ａと凹条１４ｂ
を形成した雄型連結部７、ｊ図は溝部１０を２本
形成した雄型連結部７、ｋ，ｌ図は係合溝１２の
上縁１２ａの途中、または先端に突条１２ｂを形
成した雄型連結部７、ｍ図は舌片１５部分を上方
に屈曲した雄型連結部７、ｎ図は溝部１０を除去
した雄型連結部７、ｏ図は溝部１０、および補強
リブ１１を除去した雄型連結部７、ｐ〜ｒ図は傾
斜片８の端縁を上方に屈曲し、次に外方に屈曲し
て差込縁９を形成した雄型連結部７である。また
第８図ａ〜ｍは雌型連結部１６の実施例であり、
ａ図は上縁１８の途中に長尺方向と平行に形成し
た溝１８ａ、あるいは図示しないがリブを形成
し、防水、係合力の強化を図つた雌型連結部１
６、ｂ図は下縁１９にａ図と同じような溝１９ａ
を形成した雌型連結部１６、ｃ，ｄ図は嵌合溝２
０の形状を図示するように形成した雌型連結部１
６、ｅ，ｆ図は側壁１７の下縁と上縁１８によつ
て形成される角部を図示するように形成し、防水
性、段差の強化を図る雌型連結部１６、ｇ図は嵌
合溝２０をつぼ状に形成した雌型連結部１６、ｈ
図は上縁１８を側壁１７と角度θ₆になるように傾
斜した雌型連結部１６、ｉ図は舌片２１をしたは
ぜ状に折り曲げて形成した雌型連結部１６、ｊ，
ｋ図はθ₄を鋭角、または鈍角に形成した雌型連結
部１６、ｌ図は下縁１９を側壁１７より外方に突
出し、施工の際のガイドとして機能するようにし
た雌型連結部１６、ｍ図は下縁１９の先端を内方
に屈曲し、そのまま延長して芯材挟持片２１ａを
形成し、芯材２３と表面材１の一体化を強化する
と共に、雌型連結部１６付近の芯材２３の漏洩を
防止するようにした雌型連結部１６である。な
お、第６図ａ〜ｉ〜第８図ａ〜ｍにおいては端面
壁２２を省略した表面材１のみを示し、板厚を省
略している。また、第９図ａ〜ｅは端面壁２２の
変形例であり、芯材２３裏面より下方に突出しな
い程度に、任意形状に形成したものである。さら
に、第１０図ａ〜ｇは第２図ａにおけるイ−イ線
で切断した時の表面材１のみの端面図であり、ａ
図は端面壁２２を内方に屈曲した表面材１、ｂ図
は化粧面部₂の一端縁にのみ端面壁２２を形成し
た表面材１、ｃ図は端面壁２２を外方へ傾斜した
表面材１、ｄ，ｅ図は端面壁２２の１つを直角に
形成し、他方を内方、または外方へ傾斜した表面
材１、ｆ図は一側端縁の端面壁２２、または図示
しないが両側端縁の端面壁２２の先端を外方に短
く屈曲し、コーキング材２６のストツパとして機
能させるフランジ２２ａを設けた表面材１、ｇ図
は端面壁２２の先端にはぜ状の舌片２２ｂを形成
した表面材１である。また、第１１図ａ〜ｎはボ
ードＡのその他の実施例であり、ａ図は裏面材２
４の一端を雄型連結部７の端縁よりΔlだけ突出
したボードＡ、ｂ図は舌片１５で裏面材２４の一
端を挟持し、かつ、舌片１５を上方に屈曲したボ
ードＡ、ｃ，ｄ図は裏面材２４の一端、または図
示しないが両端を表面材１と芯材２３の中間に配
設したボードＡ、ｅ図は裏面材２４の両端を舌片
１５，２１で挟持しないボードＡ、ｆ図は芯材２
３を複数の素材（同質、異質）から形成したボー
ドＡ、ｇ，ｈ図は裏面に流通溝２９を少なくとも
１本設けたボードＡでエアサイクル効果を付加し
たボードＡ、ｉ図は化粧溝３を複数本設けたボー
ドＡ、ｊ図はボードＡのほぼ中央からθ₇で屈曲
し、全体をゆるいＶ字状に形成したボードＡ、ｋ
〜ｍ図は芯材２３を表面材１に下方に膨出したボ
ードＡ、ｎ図はハツチングで示す位置のすくなく
とも１ケ所にコーキング材、あるいはパツキング
材３０を植設したボードＡである。なお、図示し
ないが、必要に応じて芯材２３の裏面に裏面材２
４を貼着しないボードＡも形成できるものであ
る。勿論、第６図ａ〜ｉ〜第１１図ａ〜ｎを各々
組み合わせたボードＡとすることもできる。〔考案の効果〕上述したように本考案に係るボードによれば、
化粧面部を少なくとも１本以上の化粧溝を形成
したため、強度が十分に補強されて反り、捩じ
れ、ペコツキが防止でき、また化粧面部が山状に
なつたりすることがない。雄、雌型連結部を前
記した落し込み構造にしたため、１人でも十分に
施工でき、かつ、目地幅（横）を一定にすること
ができる。差込縁の上側に溝部を形成したた
め、毛細管現象を阻止すると共に雨返しとして機
能するため連結部の防水性が向上する。化粧溝
の形状と目地部の形状を酷似したものにしたた
め、壁体に統一した横のラインを生み、壁体に立
体感を付与すると共に、美観性を向上することが
できる。化粧片：傾斜片、化粧片：傾斜面を
１：５〜５：１のように傾斜片、傾斜面の幅を従
来より大きくしたため、乱反射と鏡面反射により
化粧片を浮き出して立体感のある壁体を形成でき
る。各化粧面片、および傾斜面、傾斜片の少な
くとも一側端縁に端面壁を形成したため、芯材の
分布ムラ、表面材の成形による残留歪によつても
凹凸の反りが見掛け上現れない。ボードの切断
時の前ダレにる変形が皆無となる。縦目地のコ
ーキングが極めて容易に、かつ、確実となる。
ボードをサンドイツチ構造としたため、防音性、
断熱性、防振性、耐火性、耐結露性、および機械
強度が大幅に向上する。ボードを広幅にできる
ため、施工性に富み、しかも素材幅を有効に利用
できるので経済性にすぐれる。等の効果がある。 [Detailed description of the invention] [Industrial field of application] This invention is used to form horizontal walls for the interior and exterior of buildings and structures, and to create a structure in which the vertical joints are sealed with caulking material. This invention relates to a useful siding board (hereinafter simply referred to as a board). [Prior Art] Examples of this type of board that have been used in the past include Japanese Patent Publication No. 51-29339 and Utility Model Publication No. 51-29339.
These include No. 11882 and Utsuko No. 54-26649. However, the biggest drawback of this type of board is that the decorative surface becomes mountain-like, and walls formed using it have the appearance of a continuous mountain. In addition, this type of board had the disadvantage that the decorative surface was flat (including embossing) by design, and lacked a three-dimensional effect due to mere steps and irregularities. In addition, boards with a drop-in type connection structure are also known among this type of board, but they have a three-dimensional effect,
It had the disadvantages of lacking waterproofness, heat insulation, workability, and economy. Besides, the thickness is 0.27~0.36mm as surface material.
In a wall formed of a board using synthetic resin foam as a core material, a back-up material 25 and a caulking material 26 are used at vertical joints β' as shown in FIG. 5b. I needed to fill it up. However, the caulking material 26 only adheres to the edge of the surface material in a minute area, and the portion of the caulking material 26 that adheres to the synthetic resin foam hardly contributes to the adhesive strength. As a result, the caulking material 26 only has a slight adhesion to the end surface of the surface material, is easily damaged by external force or weather-resistant deterioration, requires skill in the filling process, and does not have a beautiful appearance. However, there were disadvantages such as the long time required for construction. Furthermore, since this type of board is produced on a continuous line and cut with a running cutter, the end of the board is deformed on the end face side of the long decorative surface, resulting in a compressed and deformed state near the end (front sag). It was hot. [Purpose of the invention] In order to eliminate the above-mentioned drawbacks, the present invention
The decorative surface part is divided into a plurality of horizontal decorative pieces by a decorative groove formed in an approximately triangular shape from the side and sloped surfaces.
In addition, the appearance is improved due to the relationship between specular reflection and diffuse reflection due to the inclined surface of the decorative groove and the inclined piece provided on the male connecting portion.
The decorative piece is made to stand out to enhance the three-dimensional effect, and a recess is formed between the side surface of the decorative groove and the sloped surface to improve the appearance of the joint and the appearance of the decorative groove when the boards are connected. As something very similar, it creates a horizontal line with a unified three-dimensional effect on the wall, giving it a beautiful appearance, as well as preventing warping, twisting, and
In addition to preventing flattening and improving economy and workability by forming the board wide, a male connecting part is formed on one side edge of the decorative surface part and a female type connecting part is formed on the other end, and the decorative groove is The height of the side wall and the side wall of the female type connecting part are made almost the same, so that when the wall is formed, the decorative surface part looks three-dimensional due to the shading. A groove is formed to prevent capillary action and return rain to improve the waterproofness of the connection part, and at least one of the decorative surface part and the side edge in the short direction of the inclined piece of the male connection part is bent inward. This makes it easy and beautiful to form the vertical joints where the boards are joined together, making it extremely easy to install caulking material on the vertical joints, in a short time, with a beautiful finished surface, and with excellent adhesion. Make sure that the force is fully exerted and that the core material is not exposed or the caulking material is damaged.
In addition, the present invention proposes a drop-in type board that can be easily constructed by one worker without requiring any skill. [Structure of the invention] Representative embodiments of the board according to the invention will be described in detail below with reference to the drawings. That is, FIG. 1 is a perspective view showing the above-mentioned board A, and includes, for example, a surface-treated steel sheet, a zinc/nickel alloy plated steel sheet, an aluminum/zinc alloy plated steel sheet (product name: GULF-AN, GALVALUM steel plate, SUPER ZINK), an aluminum plate, and an aluminum plated steel sheet. A surface material made of metal plates (including flat plates and embossed plates) made of one type of alloy plate, copper plate, clad steel plate, vibration-damping steel plate, etc., or a synthetic resin plate formed by one type of roll, press, or extrusion molding. 1 , a core material 23 filled on the back surface of the surface material 1 , and a sheet-like back material 24 covering the back surface of the core material 23 in a sandwich-like structure. That is , as shown in FIG .
It is composed of 6. To explain further, the decorative surface portion 2 is formed from at least one decorative groove 3 formed along the longitudinal direction of the board A and decorative pieces 2a and 2b divided into a plurality of pieces by the decorative groove 3. This makeup groove 3 is the makeup piece 2a.
The side surface 4, which intersects at θ ₁ (θ ₁ ≒90°), and the inclined surface 5, which intersects the decorative piece 2b at θ ₂ (θ ₂ ≦90°), form an approximately triangular cross section, and the side surface 4 and the inclined surface A depression 6 is formed in the middle between the surface 5 and the surface 5. Furthermore, the cosmetic groove 3 is one in the center of the decorative surface part 2 , or a plurality of grooves are arranged so as to divide the decorative surface part 2 into 3 to 5 parts, and mainly prevents the decorative surface part 2 from warping, twisting, and being bent. Cosmetic piece 2b: The ratio of the sloped surface 5 is about 1:5 to 5:1, and the so-called decorative pieces 2a, 2b and the sloped surface create a large shadow different from the conventional decorative rib and enhance the three-dimensional effect of the decorative surface part 2 . 5
The contrast between specular reflection and diffused reflection between the decorative grooves 3 and 3 creates a sense of unevenness, and as shown in FIG. The joints between the walls are made into decorative grooves to improve the design of the wall. The male connecting part 7 has an inclined piece 8 bent at an angle θ 3 that is approximately the same as the angle θ ₂ of the inclined surface 5 of the decorative groove ₃ , and the decorative piece 2 with its edge outward.
an insertion edge 9 protruding substantially parallel to a and 2b; an engagement groove 12 in which the tip of the insertion edge 9 is bent inward and then outward to form a substantially U-shaped cross section; Extension portion 14 protruding outward from the lower edge 13 of the engagement groove 12
and a tongue piece 15 which is bent into a seam shape at the tip of the extension part 14 as required. To explain in more detail, since the inclined piece 8 is bent at an angle θ 3 corresponding to the angle θ ₂ between the inclined surface 5 of the decorative groove ₃ and the decorative piece 2b, it improves the flow of rainwater and allows rainwater to flow into the joint. This prevents the accumulation of water, promotes the three-dimensional appearance of the joint, and helps increase the working width. Further, on the upper surface of the insertion edge 9, a groove 10 is recessed parallel to the longitudinal direction of the board A.
and a reinforcing rib (pipe-shaped in the figure) provided at the tip 1
1. This insertion edge 9 fits into a fitting groove 20 which will be described later, and the lower edge 19 of the fitting groove 20 is inserted into the engaging groove 12 to make the connection structure of the board A double, which improves the engagement force and waterproof property. , which improves airtightness. In addition, there is an air gap in the connecting structure by the groove portion 10.
is formed, thereby preventing capillary phenomenon, and since the reinforcing ribs 11 function as rain repellents within the connection structure, waterproofness is greatly improved. Further, the tongue piece 15 prevents the tip of the extension part 14 from waving and also prevents injuries caused by the end of the extension part 14 during operation. The female connecting portion 16 is the decorative surface portion 2
The side wall 7 has its lower end bent inward at an angle θ ₄ corresponding to the angle θ ₁ of the side surface 4 of the decorative groove 3; It is formed from a fitting groove 20 which is bent toward the lower edge 19 and has a U-shaped cross section, and a tongue piece 21 whose tip of the lower edge 19 is bent into a seam shape. To explain further, the lower edge 19 is inserted into the engagement groove 12 when the insertion edge 9 is fitted into the engagement groove 20, as shown in FIG. This helps to further strengthen the engagement force and waterproofness. Further, the tongue piece 21 can be formed into an upper ridge shape to sandwich one end edge of the back material 24, as shown in FIG. 1, or can be bent into a lower ridge shape. Reference numeral 22 denotes an end wall that allows at least one of the side ends of the decorative pieces 2a, 2b, the inclined surface 5, and the inclined piece 8 in the short direction to be vertically or at an arbitrary angle, for example, 30°.
It is curved and inclined at an angle of ~150°. This end wall 22 serves as a reinforcement for preventing the decorative pieces 2a, 2b, the inclined surfaces 5, and the inclined pieces 8 from warping, twisting, and sagging, and as an adhesion surface for the caulking material 26 as shown in FIG. 5a. Along with functioning,
This serves to block the infiltration of rainwater, heat, and sunlight from the end surface side of the board A, thereby protecting the core material 23, which will be described later. To explain further, the end wall 22 prevents the deformation of the end of the board A, thereby making the edge of the board A straight, improving the aesthetic appearance, and making the vertical joint β as shown in FIG. 5a.
By increasing the effective adhesion area with the caulking material 26, the waterproofing of the caulking material 26,
This allows the packing function to be fully exhibited and makes it difficult for the caulking material 26 to peel off due to vibrations or the like. Note that the end wall 22 has decorative pieces 2a,
2b, the inclined surface 5, and the inclined piece 8, and its shape is such that it does not cover the recessed portion 6, the engagement groove 12, and the fitting groove 20, and does not protrude from the back surface of the core material 23. It can be formed into any shape within a range. The core material 23 is filled at least in a gutter-shaped part surrounded by the decorative surface part 2 , the male connecting part 7 , and the female connecting part 16 on the back surface of the surface material 1 and mainly provides heat insulation properties to the board A. It is made of one type of material that has secondary functions such as adhesiveness, noncombustible material, cushioning material, and soundproofing material.
Specifically, it consists of synthetic resin foam, rock wool, glass wool, sheathing board, gypsum board, wood wool cement board, etc., and it consists of one type of material such as one that is discharged with raw materials, molded, hardened, self-adhesive, or a molded body. It is something. In addition, when a molded body is used, an adhesive (not shown) is required between the core material 23, the surface material 1 , and the back material 24. To explain further, the core material 23 is mainly made of synthetic resin foam, such as resin for polyurethane foam, resin for phenol foam, resin for polyisocyanurate foam, and flame retardants and flame retardant aids (borax, methane). It consists of one or more of the following: sodium borate, antimony trioxide, calcium carbonate, aluminum hydroxide), bentonite, pearlite grains, and shirasu balloons. Also,
There is a recess 23a on the back side of the core material 23 near the female connecting part.
will be established. This concave portion 23a is provided to prevent rattling and level differences in the connecting portion when the boards A are connected, and to prevent the aesthetic appearance of the wall from being impaired. 24
covers at least the back side of the core material 23 with a backing material to make the board A a sandwich structure, which improves the mechanical strength of the board A itself, as well as a noncombustible sheet, a waterproof membrane, a heat shielding sheet, a water absorbing sheet, a soundproof sheet, and a packing material. For example, asbestos paper, kraft paper, asphalt felt, metal foil (Al, Fe, Pb, Cu), synthetic resin sheet, rubber sheet, cloth sheet, gypsum paper, aluminum hydroxide paper, glass. Type 1 or 2 of fiber non-woven fabric etc.
It is made of a laminate of seeds or more, or a sheet that has been treated with waterproofing or flame retardant treatment. Here, the sizes of the above-mentioned parts will be briefly explained. As shown in FIGS. 1 and 2, the makeup piece 2
The lengths of b and 2a are L ₁ and L ₂ respectively, the range of the slope 5 is W ₁ , the range of the slope piece 8 is W ₂ , and the distance from the tip of the insertion edge 9 to the deepest part of the engagement groove 12 is l ₁ , the distance from the tip of the insertion edge 9 to the end of the inclined piece 8 of the groove portion 10 is l ₂ , the distance from the innermost part of the engagement groove 12 to the edge of the extension portion 14 is l ₃ , the fitting groove Lower edge 19 from the deepest part of 20
The distance to the tip of is l ₄ , the distance from the deepest part of the fitting groove 20 to the lower end of the side wall 17 is l ₅ , the range of the recess 23a is l ₆ , the height of the side surface 4 is h ₁ , the height of the side wall 17 h ₂ ,
If the heights from the decorative pieces 2a, 2b to the back surface of the core material 23 are h ₃ and h ₄ , l ₁ ≒ l ₄ , l ₂ ≦ l ₅ , l ₃ ≒ l ₆ , h ₁ ≒
h ₂ , h ₃ ≒ h ₄ , and L ₁ :W ₁ =1:5~5:
1, there is a relationship of L ₂ :W ₂ =1:5 to 5:1. In other words, the above relationship means that when the boards A are connected, the decorative grooves 3 and the joints have a very similar appearance, creating unified lines in the wall, forming a wall with rich design, and also making the slope 5, the slope Piece 8 and cosmetic pieces 2a, 2b
This is to improve the three-dimensional appearance of the board through specular reflection and diffused reflection. Note that L ₁ , L ₂ , and
It is desirable that W ₁ and W ₂ satisfy L ₁ ≒ L ₂ , W ₁ ≒ W ₂ , but if necessary, L ₁ > L ₂ or L ₁ < L ₂ , W ₁
>W ₂ or W ₁ <W ₂ , that is, L ₁ :W ₁ ≠L ₂ :
A relationship such as W ₂ is also possible. Here, board A according to the present invention and conventional board
Let's compare it with A′. As an example, as shown in Fig. 1 , a colored steel plate (thickness 0.27
mm), decorative piece 2b: inclined surface 5, decorative piece 2
a: The inclined pieces 8 are formed at a ratio of 5:2, and the core material 23
The polyisocyanurate foam is discharged as a raw material, reacted and foamed to a density of 30Kg/ ^m3 ,
A board A as shown in FIG. 1 was manufactured by preparing aluminum kraft paper as the backing material 24. On the other hand, as a comparative example, an end wall 2 as shown in FIG.
A board A′ without 2 was molded. In addition, the comparative example is
The length, thickness, and material used were the same as in the example.
The following various tests were conducted on both boards A and A'. Namely, ○A moist heat, drying test, ○B density variation test of core material 23, ○C vertical joints β, β' (shown in Figure 5 a and b, Examples were formed as shown in a and comparative examples were formed as shown in b) ) Waterproof test, ○ Niko King material 26
We measured workability during filling, observation of the external appearance after manufacturing (○), measurement of the defective product rate (in view of the appearance of the butt end) in (○), and measurement of deformation during cutting in (○). The results were as shown in the table below. In addition, ○A is the height from the plane at the center of each cosmetic piece after drying at 80 ± 5 ° C for 105 minutes and leaving at 90% RH for 2 hours (convex shape is +, concave shape is -) , ○B shows the cases when the density of the core material 23 is approximately constant over the entire width and when it varies greatly, the former being 30 to 33 kg/m ³ and the latter being 20
Appearance of the decorative surface part 2 when the foam structure is ~40Kg/m ³ and many voids are observed. ○C is for the vertical joints β and β′
Leakage to the back side and damage to vertical joints β and β′ when water is injected at a pressure of 70 kgf, ○D indicates filling time for the same length and width, ○E indicates overall observation of boards A and A′,
◯ indicates the proportion of boards A and A' that are defective due to the end surface, and ◯ indicates deformation due to front sagging caused by cutting. [Table] [Table] Note that if the height of the decorative surface portion increases or decreases by 1 mm, the shrinkage or elongation of the back material 24 in the width direction will be 12 mm. This is because the foamed structure of the core material 23 is exposed at the end of the wood, resulting in poor filling and non-uniformity of the foamed structure. [Construction Example] Now, assume that boards A as shown in FIG. 1 are laid horizontally as shown in FIG. 3 to form a wall. In addition, boards A ₁ and A ₂ use a 0.27 mm thick colored steel plate for the surface material 1 , aluminum kraft paper is used for the back material 24, and the core material 23 is composed of the surface material 1 and the back material 2.
4, raw materials for polyisocyanurate foam were discharged, reacted and foamed, and then cured and integrated. Therefore, the extension part 14 of the nth board A ₁ was fixed to the wall base 27 consisting of main pillars, studs, waterproof sheets, etc. (the figure shows the wall base when no waterproof sheet is used) via nails 28. do.
Next, the female connecting part 16 of the n+1st stage board _A2
The fitting groove 20 is fitted into the insertion edge 9 of the male connecting portion 7 of the board _A1 to form a horizontal joint α as shown in FIG. In addition, the vertical joint β is formed by butting the side edges of the board A in the short direction, as shown in Fig. 5a.
Form as shown. That is, it is sufficient to insert the backup material 25 into the vertical joint β and then fill the caulking material 26 so as not to protrude from the decorative surface portion 2 . The vertical joint β formed in this way is similar to the vertical joint (fifth joint) of the conventional horizontal board.
Unlike β' (shown in FIG. b), since the bonding area between the surface material 1 and the caulking material 26 is large, it has excellent waterproofness, workability, and vibration resistance. Note that it is necessary to use a starter (not shown) for the base, and caulking material and accessories for the exit and entry corners (not shown). [Other Embodiments] What has been described above is only one embodiment of the board A according to the present invention, and it can also be formed as shown in FIGS. 6 a-i to 11 a-n. That is, FIGS. 6A to 6I show modified examples of the decorative groove 3, and FIGS. 6A and 6B show a chamfered surface 3a between the decorative piece 2a and the side surface 4, or between the side surface 4 and the recess 6 to enhance the three-dimensional effect. Fig. c shows a decorative groove 3 in which θ ₁ is formed at an acute angle or an obtuse angle (not shown), Figs. This is the decorative groove 3 with the . Figures 7a to 7r show other embodiments of the male connector 7 , in which figure a shows the male connector 7 in which the tongue piece 15 is formed in the shape of a lower flap, and figures b and c show the extension part 14. A male connecting part 7 with a step, d figure shows a male connecting part 7 in which the upper edge 12a of the engagement groove 12 is formed at an angle θ ₅ with respect to the lower edge 13, and figure e shows the entire insertion edge 9. The male connecting part 7 is inclined upward, the figure f shows the extension part 14, or the male connecting part 7 in which the protrusion 14a is formed on the lower edge 13 in parallel with the longitudinal direction, and the figure g shows the extension part 14, or the lower edge. Male type connecting part 7 with grooved line 14b formed on 13. Figures h and i show the protruding line 14a and grooved line 14b.
The male connecting part 7 with two grooves 10 formed in the figure J, and the male connecting part 7 having two grooves 10 formed therein, and the figures K and L having a protrusion 12b formed in the middle or at the tip of the upper edge 12a of the engagement groove 12. Male type connecting part 7 , figure m shows male type connecting part 7 with tongue piece 15 bent upward, figure n shows male type connecting part 7 with groove 10 removed, figure o shows groove 10 and reinforcing rib 11 removed. Figures p to r show a male connector 7 in which the end edge of the inclined piece 8 is bent upward and then bent outward to form an insertion edge 9. Moreover, FIGS. 8a to 8m show examples of the female type connecting portion 16 ,
Figure a shows a female connecting portion 1 in which a groove 18a is formed in the middle of the upper edge 18 in parallel with the longitudinal direction, or a rib (not shown) is formed to improve waterproofing and engagement force.
6. In figure b, there is a groove 19a on the lower edge 19 similar to figure a.
Figures c and d show the fitting groove 2.
Female type connecting portion 1 formed as shown in the shape of 0
Figures 6, e, and f show a female connecting part 16 formed as shown in the corner formed by the lower edge and upper edge 18 of the side wall 17 to strengthen waterproofness and step height. Female type connecting portion 16 , h in which the matching groove 20 is formed into a pot shape
The figure shows a female connecting part 16 whose upper edge 18 is inclined at an angle θ ₆ with the side wall 17, and figure i shows a female connecting part 16 formed by bending the tongue piece 21 into a seam shape.
Figure K shows a female connecting part 16 in which θ ₄ is formed at an acute or obtuse angle, and Figure L shows a female connecting part 16 in which the lower edge 19 protrudes outward from the side wall 17 to function as a guide during construction. , m shows that the tip of the lower edge 19 is bent inward and extended as it is to form a core material holding piece 21a, which strengthens the integration of the core material 23 and the surface material 1 and also closes the area near the female connecting portion 16 . The female connecting portion 16 is designed to prevent the core material 23 from leaking. In addition, in FIG. 6 a to i to FIG. 8 a to m, only the surface material 1 with the end wall 22 omitted is shown, and the plate thickness is omitted. Moreover, FIGS. 9a to 9e show modified examples of the end wall 22, which is formed into an arbitrary shape so as not to protrude downward from the back surface of the core material 23. Furthermore, FIGS. 10a to 10g are end views of only the surface material 1 when cut along line E-I in FIG. 2a, and a
The figure shows the surface material 1 with the end wall 22 bent inward, the figure b shows the surface material 1 with the end wall 22 formed only on one end edge of the decorative surface section ₂ , and the figure c shows the surface material with the end wall 22 inclined outward. Figures 1 , d and e show one of the end walls 22 formed at right angles and the other inclined inwardly or outwardly. The surface material 1 is provided with flanges 22a that are bent briefly outward at the tips of the end walls 22 on both sides and function as stoppers for the caulking material 26. Figure g shows a flap-shaped tongue piece 22b at the tip of the end wall 22. This is a surface material 1 formed with. 11a to 11n show other embodiments of board A, and figure a shows backing material 2.
Board A in which one end of the 4 protrudes from the edge of the male connecting portion 7 by Δl, board A in figure b, board A in which one end of the back material 24 is held between the tongue piece 15, and the tongue piece 15 is bent upward. , d shows a board A in which one end of the back material 24 or both ends (not shown) are arranged between the surface material 1 and the core material 23, and e shows a board in which both ends of the back material 24 are not held between the tongue pieces 15 and 21. Figures A and f are core material 2.
3 is made of multiple materials (same and different). Figures g and h are board A with at least one circulation groove 29 on the back side, board A with an air cycle effect added, and figure i is board A with decorative groove 3. Board A, j is a board with multiple boards A, k bent at θ ₇ from approximately the center of board A, and formed into a loose V-shape as a whole.
Figures 1 to m show a board A in which the core material 23 is bulged downward from the surface material 1 , and Figure n shows a board A in which a caulking material or packing material 30 is planted at at least one location indicated by hatching. Although not shown, a back material 2 may be attached to the back surface of the core material 23 if necessary.
It is also possible to form a board A to which no 4 is attached. Of course, the board A may be a combination of each of FIGS. 6 a to 11 to 11 a to n. [Effects of the invention] As mentioned above, according to the board according to the invention,
Since at least one decorative groove is formed in the decorative surface part, the strength is sufficiently reinforced and warping, twisting, and flattening can be prevented, and the decorative surface part does not become mountain-like. Since the male and female joints have the above-mentioned drop-in structure, even one person can perform the work, and the joint width (horizontal) can be kept constant. Since the groove is formed on the upper side of the insertion edge, it prevents capillary phenomenon and functions as a rain cover, improving the waterproofness of the connecting part. Since the shape of the decorative groove and the shape of the joint are made to be very similar, it is possible to create a unified horizontal line on the wall, give the wall a three-dimensional feel, and improve its aesthetics. Decorative piece: Slanted piece, Decorative piece: Slanted surface with a ratio of 1:5 to 5:1, and the width of the sloped surface is wider than before, so the decorative piece stands out due to diffuse reflection and specular reflection, creating a wall with a three-dimensional effect. Can form a body. Since an end wall is formed on each decorative surface piece, the sloped surface, and at least one side edge of the sloped piece, no apparent warpage of unevenness appears even due to uneven distribution of the core material or residual strain due to molding of the surface material. There is no deformation caused by front sagging when cutting the board. Caulking of vertical joints becomes extremely easy and reliable.
The board has a sanderch structure, which provides soundproofing and
Thermal insulation, vibration isolation, fire resistance, condensation resistance, and mechanical strength are significantly improved. Since the board can be made wide, it is easy to install, and the width of the material can be used effectively, making it highly economical. There are other effects.

[Brief explanation of the drawing]

第１図は本考案に係るボードの一例を示す斜視
図、第２図は上記ボードの表面材を説明する説明
図、第３図は上記ボードを用いて形成した壁体の
係合状態を示す部分断面図、第４図は比較例を示
す斜視図、第５図ａ，ｂは縦目地の状態を説明す
る説明図、第６図ａ〜ｉ、第７図ａ〜ｆ、第８図
ａ〜ｍ、第９図ａ〜ｅ、第１０図ａ〜ｇ、第１１
図ａ〜ｎはその他の実施例を示す説明図である。 Fig. 1 is a perspective view showing an example of a board according to the present invention, Fig. 2 is an explanatory view explaining the surface material of the board, and Fig. 3 shows an engaged state of a wall formed using the board. FIG. 4 is a perspective view showing a comparative example; FIGS. 5 a and b are explanatory views explaining the state of vertical joints; FIGS. 6 a-i, 7 a-f, and 8 a ~m, Figures 9a-e, Figures 10a-g, 11th
Figures a to n are explanatory diagrams showing other embodiments.

Claims

[Scope of utility model registration request]

A horizontally long metal plate or a synthetic resin plate is used as a surface material, and a decorative groove consisting of at least one side surface and an inclined surface is provided in the decorative surface portion of the surface material to divide the decorative surface portion into a plurality of decorative pieces. An inclined piece inclined in the same manner as the decorative surface of the decorative groove at one end of the decorative surface portion, an insertion edge whose end edge of the inclined piece is bent outward substantially parallel to the decorative piece, and a tip of the insertion edge. Fold inward,
Next, a male connecting portion is provided, which is composed of an engaging groove that is bent outward and has a substantially U-shaped cross section, and an extension portion that projects the lower edge of the engaging groove outward. The other end of the decorative surface part is fitted with an inwardly bent side wall and the insertion edge in which the lower end of the side wall is bent inwardly and then outwardly to form a substantially U-shaped cross section. In the siding board, a female connecting portion is provided, the back surface of the surface material is integrally filled with a core material, and the back surface of the core material is covered with a sheet-like back material. A recess is formed between the sloped surface and the side surface of the groove, and the ratio of decorative piece: sloped surface and decorative piece: sloped piece is 1:5 to 5:1. A groove section recessed parallel to the longitudinal direction and a reinforcing rib are formed at the tip of the groove section on the upper side of the rim, and a decorative piece of the decorative surface part, an inclined surface of the decorative groove, and an inclined piece of the male connecting part are formed. What is claimed is: 1. A siding board characterized in that an end wall is formed in which at least one side edge in the short direction of the board is bent inward.