JP2001164711A - Waterproof sheet for roofing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waterproof sheet for roofing, by which excellent appearance and durability can be obtained and which has excellent aging resistance such as crack resistance, rupture resistance or the like. SOLUTION: The waterproof sheet 10 for roofing, by which a roof is formed by laying on a roof foundation having a pitch, is used as an object, the waterproof sheet has a sheet body 20 composed of a soft synthetic resin and rib- shaped projections 30 integrally formed on the surface 21 of the sheet body 20. The rib-shaped projections 30 are continuously extended linearly along the sheet longitudinal direction X, and a plurality of the rib-shaped projections 30 are arranged in parallel at regular intervals in the sheet cross direction. The rib-shaped projections 30 are set in height of 1.0-20 mm and width of 1.0-50 mm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproofing sheet for roofing which is applied to sloped roofs such as reinforced concrete (RC) and lightweight cellular concrete (ALC) houses and buildings, such as single-flow and double-flow roofs.

[0002]

2. Description of the Related Art Conventionally, when forming a sloping roof in a building or a house, a roofing roof is constructed as a water-resistant layer on a roof basement, and a viscosity fixing tile or a cement roofing tile is applied thereto using a predetermined fixing jig. , Glass tiles, metal tiles, color vests,
It is common to install roofing panels such as colonial, but roofing structures using tiles or panels are not always sufficiently satisfactory in terms of wind resistance, waterproofing, construction workability, etc. .

In recent years, a waterproof sheet made of a soft synthetic resin, synthetic rubber, or the like has been fixed on a roof base with an adhesive or the like, and the edges of adjacent waterproof sheets have been joined and fixed to form a roof. There has been proposed a sheet-roofed roof.

In this sheet roof, a waterproof sheet having a larger area can be used as compared with a tile, a panel, or the like.
Since the area that can be constructed at a time is large, the construction workability can be improved, and the edges of the adjacent waterproof sheets can be securely joined and fixed to each other, so that the wind resistance and the waterproofness can be improved.

[0005]

However, the conventional waterproofing sheet for roofing has a thickness of at most about 1 to 2 mm, is flat and poor in three-dimensional appearance, cannot provide a good aesthetic appearance, and particularly has a slope. At present, it is not used for the roof with the ceiling.

[0006] When the thickness of the waterproof sheet is increased, a three-dimensional effect can be imparted at the overlapping portion and a good appearance can be obtained. However, the thick waterproof sheet has too high rigidity. , It is not possible to obtain sufficient flexibility, it is difficult to fit the waterproof sheet into the base of the roof sufficiently, and this reduces the workability of construction, and the thickness of the sheet increases.
Material costs rise and costs increase, which is not practical.

Further, in a conventional waterproofing sheet for roofing, if it is used for a long period of time that greatly exceeds the service life under severe conditions, defects such as cracks and breaks may occur due to aging such as internal distortion. As a result, the waterproof property may be impaired, and further improvement in durability is required. Furthermore, once a crack or break occurs, there is a problem that the crack or the like spreads over a wide area at an early stage, thereby increasing damages such as water leakage.

[0008] Further, the waterproof sheet may be deformed in the surface direction due to aging due to long-term use, and there is a concern that a design pattern or the like applied to the sheet surface may be deformed into an irregular shape and deteriorate the aesthetic appearance. By the way.

The present invention solves the above-mentioned problems of the prior art, can be easily constructed while reducing costs, can obtain sufficient waterproofness and wind resistance, and can maintain good aesthetics for a long time. In addition, it is an object of the present invention to provide a waterproofing sheet for roofing, which can further improve the durability and, even if a defect such as a crack or a break occurs, can minimize damage caused by the defect.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a waterproofing sheet for roofing, which is laid on a sloped roof base to form a roof. And a sheet main body made of a soft polymer material having a height of 1.0 to 20 mm and a width of 1.0.
The gist is provided with a streak of 0 to 50 mm.

In the waterproofing sheet for roofing of the present invention, the sheet body is made of a soft polymer material having a waterproof property such as a soft synthetic resin or a synthetic rubber. Since a large area can be used, the construction area per sheet is large, the area that can be constructed at a time is large, and construction workability can be improved. Furthermore, in the waterproofing sheet for roofing of the present invention, since the sheet itself has sufficient waterproofness, it is not necessary to apply a special waterproofing treatment to the roof foundation, and accordingly, the number of working steps can be reduced. Workability can be further improved.

Further, in the present invention, in the laid waterproof sheet, the edges of the adjacent waterproof sheets can be securely joined by solvent welding, hot air welding, an adhesive or the like.
Sufficient waterproofness and wind resistance can be obtained.

Further, in the present invention, since the streak projection having a specific configuration is integrally formed on the surface of the sheet main body, it is possible to improve the deterioration resistance of the streak formation portion.
As a result, deterioration resistance such as tensile strength of the entire sheet can be improved. For this reason, it is possible to effectively prevent the occurrence of problems such as cracks due to aging deterioration such as internal distortion during long-term use, and to further improve durability.

Furthermore, even if the sheet itself is to be broken or broken due to long-term use or the like, the progress of the crack or the like can be reliably stopped at the portion of the streak-like projection, and the crack or the like spreads widely. Can be prevented, and damage such as water leakage due to cracks can be minimized.

Further, since the streaks are formed on the surface of the sheet main body, a three-dimensional effect is given by the shading of the streaks and a good aesthetic appearance can be obtained.

In addition, since the sheet itself can be given an appropriate rigidity by forming the streak-like projections, good shape retention can be obtained. For this reason, the surface portion of the waterproof sheet can be prevented from being deformed into an irregular shape due to aging or the like, and the above-described good appearance can be maintained for a long time.

Further, since it is not necessary to increase the thickness of the sheet body, the thickness of the sheet body can be reduced.
For this reason, sufficient flexibility can be given to the sheet itself, the waterproof sheet can be sufficiently fitted to the roof base without gaps, and the construction workability can be further improved. In addition, the material thickness can be reduced because the sheet thickness is small, so that the cost can be reduced.

Hereinafter, the configuration of the present invention will be described in more detail with reference to the drawings.

As shown in FIGS. 1 to 4, a waterproofing sheet (10) for roofing according to the present invention is laid on a sloped base (2) to form a sheet roof (1). It is.

The waterproof sheet (10) of the present invention is made of a soft polymer material having waterproof properties, for example, a soft thermoplastic resin such as a soft polyvinyl chloride resin, a polyolefin resin, a vinyl chloride thermoplastic elastomer, or a polyolefin thermoplastic elastomer. It is made of a synthetic rubber or the like in addition to the synthetic resin, and may be formed of a single material, or may be formed by laminating one or more kinds of materials. Among them, in particular, those made of a thermoplastic resin can be preferably employed because the production can be easily performed by utilizing extrusion molding or the like.

The waterproof sheet (10) of the present invention comprises a sheet body (20) and streaks (30) integrally formed on the surface of the sheet body (20).

The sheet body (20) has a thickness (T)
Is preferably 1 to 4 mm, more preferably a lower limit of 1.5 mm or more and an upper limit of 3 mm or less. That is, if the thickness is too large, the rigidity becomes too high, and sufficient flexibility may not be obtained, and the workability may be reduced. On the other hand, if it is too thin, appropriate rigidity and strength cannot be secured, and cracks and breaks may occur early.

The width (W) of the sheet body (20) is 3
00 to 2500 mm, preferably with a lower limit of 1000 mm
As described above, the upper limit is preferably adjusted to 2000 or less. That is, if the sheet width (W) is too small, the work area per sheet is reduced, the number of sheets to be constructed is increased, and the workability may be reduced. On the other hand, if the sheet width (W) is too large, it becomes difficult to carry the sheet or unwind the sheet when laying the sheet, and the workability may be reduced.

Further, it is preferable that a reinforcing layer (25) made of fiber is interposed in the sheet body (20) in the middle in the thickness direction. That is, by interposing the fiber reinforcing layer (25), the rigidity and strength of the sheet main body (20) can be efficiently improved, good morphological stability can be obtained, and cracks and breaks are also generated. Can be prevented more reliably.

As the fiber reinforcing layer (25), a layer made of an inorganic fiber such as a glass fiber or an organic synthetic fiber such as a polyester fiber can be suitably used. Further, the installation height (H) of the fiber reinforcing layer (25) is 0.2T to 0.2T from the back side of the sheet, when the thickness of the sheet body is "T".
It is preferable to set 5T, specifically, 0.2 to
Preferably, it is set to 2.0 mm.

In the present invention, the height (t) from the surface of the sheet body (20) is 1 to 20 m.
m, preferably the lower limit is 1.5 m
It is preferable to set the upper limit to 6 mm or less. Further, the width (w) of the streak-like projection (30) needs to be set to 1 to 50 mm, and preferably, the lower limit is set to 5 mm or more and the upper limit is set to 10 mm or less. That is, when the projection height (t) is too low or the projection width (w) is too small, the presence of the streak-like projection (30) disappears,
The waterproof sheet (10) cannot be given a three-dimensional effect, and not only does not give a good aesthetic appearance, but also cannot give a suitable strength or rigidity, which is not preferable. Conversely, if the protrusion height (t) is too high or the width (w) is too large, the rigidity becomes too high, and sufficient flexibility cannot be obtained, resulting in a decrease in construction workability. At the same time, manufacturing becomes difficult and costs increase, which is not preferable.

In the present invention, the streak-like projections (30) are formed linearly so as to be continuous in the sheet length direction (purlin direction X), and are formed along the sheet width direction (gradient direction Y). It is preferable to form a plurality in parallel at intervals of.
That is, when adopting this configuration, as a roofing material,
Good design properties can be imparted, and moderate strength and rigidity can be imparted to the entire sheet with good balance. When this configuration is adopted, the interval (P) between adjacent streak projections is preferably set to 100 to 1000 mm, more preferably, the lower limit is 300 mm or more, and the upper limit is 600 mm or less. That is, if the projection interval (P) is too small, the strength and rigidity become too high, which may not only make the construction difficult but also make the production difficult. Conversely, if the projection interval (P) is too wide, there is a possibility that good design properties and appropriate strength and rigidity cannot be obtained.

In the present invention, as shown in FIG. 5, the streaks (30) are formed intermittently along the sheet length direction (X), or as shown in FIG. The stripe-shaped projections (30) adjacent in the direction (Y) may be formed in a stepped manner so as to be shifted in the sheet length direction (X). Further, the streak-like projections (30) may be formed along the sheet width direction (Y) or may be formed obliquely to the sheet length direction (X).

In the present invention, as shown in FIG. 7, the streak-like projections (30) are formed in parallel in the length direction (X) and the width direction (Y), and are arranged in a grid. You may do it. When the streak-like projections (30) are arranged in a grid shape in this way, when a problem such as an internal stress or a crack occurs, the streaks are formed within one frame formed by the grid-like streak-like projections (30). In addition, the progress of cracks and the like can be stopped with certainty.

In the present invention, the streaks (30)
Need not necessarily be formed to extend linearly along the surface (21) of the sheet body, but may be formed to extend in a meandering manner, for example, in a wavy shape.

In the present invention, the streak-like projection (30) is preferably formed in a polygonal shape having an edge. That is, the edge portion (35) is visually emphasized, and a good three-dimensional effect can be obtained. Further, particularly in the case of forming a quadrangular shape among polygonal shapes, the edge portions (35) (3)
The balance between the degree of enhancement of 5) and the degree of enhancement of the outer surface of the projection is improved, and a more favorable three-dimensional effect can be provided.

In the present invention, however, the cross-sectional shape of the streak-like projections (30) is not particularly limited, and may be, for example, a semicircle or a combination of a circle and a polygon other than the above-mentioned polygonal shape. May be formed.

In the present invention, when the cross-sectional shape of the streak-like projection (30) is formed in a square shape, the side surface (31) on the lower side (eave tip side) of the streak-like protrusion (30) in the gradient direction (Y).
May be formed so as to rise substantially at right angles to the surface (21) of the sheet body (20). That is, in this configuration, a dark shaded portion can be formed between the eaves side surface (31) of the streak-like projection (30) and the sheet body surface (21). (3
The height of 0) is further emphasized, and a more excellent three-dimensional effect can be provided.

Further, in the present invention, the corner (3) between the side surface (31) of the eaves and the sheet body surface (21) is provided.
By forming an arc shape by adding a radius (R) to 1a), it is possible to prevent stress due to aging or the like from concentrating at the corner (31a), effectively prevent sheet deterioration,
The durability can be further improved.

In the present invention, the streaks (30)
Side (32) of the upper side (ridge side) in the gradient direction (Y) at
Is formed so as to be tilted toward the eaves, and the side (3
The angle of inclination (θ) with respect to the sheet body surface (21) in 2) is preferably set smaller than a right angle. In other words, when this configuration is adopted, the side surface of the streak projection ridge (32)
This makes it difficult for dust and dirt, as well as rainwater, to accumulate, and the sheet surface can be kept in a good condition.

Specifically, the inclination angle (θ) of the side surface (32) of the stripe projection ridge with respect to the sheet body surface (21) is set to 30.
It is good to set to about 70 °. That is, if this angle (θ) is too small, the boundary between the sheet main body surface (21) and the streak projection (30) becomes unclear, and the streak projection (3)
The presence of 0) may not be sufficiently imparted, and a good aesthetic appearance may not be obtained. Conversely, if the inclination angle (θ) is too large, dirt, dust, and the like easily accumulate on the side surface (32) of the streak projection ridge.

In the present invention, the streak-like projections (30) are preferably formed at positions corresponding to the eaves-side edges of the sheet body (20). In other words, when this configuration is employed, a more favorable three-dimensional effect can be imparted by the thickness of the sheet located on the lower side in the overlapping portion of the edge portions of the sheet.

In the present invention, it is preferable to form a concavo-convex pattern (26) with a large number of concavo-convex portions on the surface (21) of the sheet body to further improve the aesthetic appearance. In addition, since the edges of the adjacent waterproof sheets are joined by welding or bonding, when forming an uneven pattern on the surface of the sheet body, the surface of the edge of the sheet below the portion to be overlapped and joined is joined. Is preferably formed on a smooth surface in order to sufficiently secure the bonding strength with the edge of the adjacent waterproof sheet.

Further, if necessary, the sheet body surface (2
In 1), a color pattern may be provided.

The waterproofing sheet for roofing of the present invention (10)
Can be easily manufactured using, for example, extrusion molding. In this case, when the streaks (30) are formed along the sheet length direction (purlin direction X), the streaks (30) can be formed at the same time as the extrusion molding, and the production can be performed more efficiently. can do.

In the case of forming an uneven pattern (26) on the sheet surface or forming streaky projections along the sheet width direction (Y), an extruded sheet (waterproof sheet) is required at the time of extrusion molding.
A concavo-convex pattern or the like can be formed by pressing a molded roll against the surface, or the concavo-convex pattern or the like can be formed on the surface of the waterproof sheet after molding by using, for example, a hot press molding method. In the present invention, needless to say, the method of forming the waterproof sheet (10) and the method of forming the uneven pattern are not limited to the above-described methods.

When the waterproofing sheet (10) for roofing of the present invention is applied, a fixing disk (5) made of a resin-coated steel plate or the like is fixed on a roof base (2) at an appropriate interval with fixing nails or the like. , A waterproof sheet (10) is laid on the roof foundation (2), and a required portion of the waterproof sheet (10) is joined and fixed to the fixing disk (5) by solvent welding or hot air welding. It is possible to suitably employ a so-called insulation method or a so-called adhesive method in which substantially the entire back surface of the waterproof sheet (10) is bonded and fixed to the roof base (2) with an adhesive.

When laying a plurality of waterproof sheets (10) in parallel in this manner, the edges of adjacent waterproof sheets are joined by fusion bonding or bonding. Edges of adjacent tarpaulins
By overlapping and joining, a step can be formed by the overlapped portion, and a more excellent three-dimensional appearance and aesthetic appearance can be obtained, and the waterproofness can be further improved.

In the above description, the case where the waterproof sheet of the present invention is applied to a double-flow roof is described. However, the present invention can also be applied to a sloped roof such as a single-flow roof.

[0045]

EXAMPLES Examples of the present invention and comparative examples for deriving the effects will be described below.

[0046]

[Table 1]

Example 1 Extrusion molding was performed using a soft polyvinyl chloride resin as a molding material, and the thickness was 2 mm, the width was 1 m,
A roofing waterproof sheet having a length of 10 m was manufactured. In addition,
At the time of this extrusion molding, as shown in Table 1 above, the surface of the waterproof sheet has a height of 1 mm and a width of 8 mm.
Were formed continuously along the sheet length direction and at intervals (pitch) of 450 mm in the sheet width direction.

<Examples 2 to 7> As shown in Table 1 above, a roofing waterproof sheet having the following structure was produced by the same method as described above.

A waterproof sheet in which streaks having a height of 4 mm and a width of 8 mm were formed at a pitch of 450 mm on the sheet surface was prepared as Example 2.

A waterproof sheet in which streak projections having a height of 14 mm and a width of 8 mm were formed at a pitch of 450 mm on the sheet surface was prepared as Example 3.

A waterproof sheet in which streaks having a height of 4 mm and a width of 3 mm were formed at a pitch of 450 mm on the sheet surface was prepared as Example 4.

A waterproof sheet in which streak-like projections having a height of 4 mm and a width of 40 mm were formed at a pitch of 450 mm on the sheet surface was prepared as Example 5.

A waterproof sheet in which streaks having a height of 4 mm and a width of 8 mm were formed at a pitch of 100 mm on the sheet surface was prepared as Example 6.

A waterproof sheet in which streaks having a height of 4 mm and a width of 8 mm were formed at a pitch of 800 mm on the sheet surface was prepared as Example 7.

A waterproof sheet in which streaks having a height of 4 mm and a width of 8 mm were formed at a pitch of 50 mm on the sheet surface was prepared as Example 8.

[0056]

[Table 2]

<Comparative Examples 1 to 5> As shown in Table 2 above, using the same method as described above, a waterproof sheet having no flat portions on the sheet surface was produced, and Comparative Example 1 was obtained.

A waterproof sheet in which streaks having a height of 25 mm and a width of 8 mm were formed at a pitch of 450 mm on the sheet surface was prepared as Comparative Example 2.

A waterproof sheet in which streaks having a height of 4 mm and a width of 60 mm were formed at a pitch of 450 mm on the sheet surface was prepared as Comparative Example 3.

0.5 mm high and 8 mm wide on the sheet surface
The waterproof sheet in which the streak projections of No. were formed at a pitch of 450 mm was produced.

On the sheet surface, a height of 4 mm and a width of 0.5 mm
The waterproof sheet in which the streak projections of No. were formed at a pitch of 450 mm was produced.

<Evaluation> Each of the waterproof sheets obtained as described above was evaluated for appearance, productivity, workability (construction workability), and suppression of the spread of defects at the time of deterioration (cracks).

At this time, the external appearance was visually observed after the sheet was applied, and a streak-like projection gave a good three-dimensional appearance in terms of design. The specimens that were inferior when viewed from above were evaluated as “Δ”, and those with no stereoscopic effect were evaluated as “×”.

Regarding the productivity, it was difficult to stably produce the product which was able to be produced stably by the usual production method and a product of sufficient quality was obtained. A product of reasonable quality was rated as “Δ”, and a product that could not be produced stably and had poor quality was rated as “×”.

The workability is moderately flexible.
"○" indicates that it can be easily adapted to the roof foundation and can be easily constructed. Although it is somewhat less flexible, it will be adapted to the roof foundation to the extent that there is no problem in actual use. Those that could be done were evaluated as "△", and those that could not be well adapted to the roof ground and were difficult to construct were evaluated as "x".

Regarding the suppression of the spread of the defect at the time of deterioration, when a defect such as a crack occurred, the progress of the defect could be stopped with a certain degree of difficulty within the minimum range.
For practical purposes, those that could be stopped within a small range that did not hinder were evaluated as “△”, and those that could not stop the progress of the defect within a small range were evaluated as “x”.

Based on each of these evaluations, each waterproof sheet was comprehensively evaluated (comprehensive evaluation), and a very good product was evaluated as “◎”, and a good product as a practical product. "O", "Good" for good, "X" for poor.

These evaluations are also shown in Tables 1 and 2 above. As is clear from the evaluation results, those of Examples 1 to 8 related to the present invention can be judged to be excellent products as waterproofing sheets for roofing.

On the other hand, Comparative Examples 1 to 5, which deviate from the gist of the present invention, had some problems as a waterproofing sheet for roofing. For example, when there is no streak as in Comparative Example 1, a three-dimensional effect cannot be obtained, and not only a good appearance cannot be obtained, but also the spread of cracks cannot be sufficiently suppressed. Furthermore, as in Comparative Examples 4 and 5, even if the waterproof sheet has streaky projections, if the projection height and width are too small, a three-dimensional effect cannot be obtained, and a good appearance can be obtained. However, the spread of the cracks could not be sufficiently suppressed by the projections. Comparative Example 2,
If the streak projection is too large as in 3, it is not flexible, it is difficult to fit it into the roof base, and good workability cannot be obtained. Until the resin was sufficiently filled, good productivity could not be obtained.

In the waterproof sheet of Example 1, although the height of the projections was formed slightly lower, the spread of the cracks could be suppressed to a level that would not hinder practical use. Furthermore, in the waterproof sheet of Example 8, compared with Examples 1 to 7,
Although the spacing between the projections was slightly narrow, and the flexibility was slightly difficult, the construction could be performed with a good finish.

[0071]

As described above, according to the waterproofing sheet for roofing of the present invention, it is possible to easily perform the construction while reducing the cost, to obtain sufficient waterproofness and wind resistance, and to obtain good waterproofness. This makes it possible to maintain a beautiful appearance for a long period of time, further improve durability, and even if a defect such as a crack or break occurs, the effect of the damage can be minimized.

In the present invention, when the streaks are formed in a predetermined arrangement, there is an advantage that the above-mentioned effects can be obtained more reliably.

In the present invention, when a soft synthetic resin is used as the sheet material, there is an advantage that the sheet can be manufactured more easily by extrusion molding or the like.

In the present invention, when a fiber reinforcing layer is interposed in the sheet body, there is an advantage that rigidity and strength can be improved.

In the present invention, when a large number of uneven portions (irregular patterns) are formed on the sheet surface, there is an advantage that a better appearance can be obtained.

In the present invention, when streak projections having a unique shape are formed, there is an advantage that a better appearance can be obtained and durability can be further improved.

In the present invention, when the streak projections are formed at predetermined intervals, there is an advantage that the above-described effects can be obtained more reliably.

In the present invention, in the case where the streak-like projections are arranged at the eaves edge of the sheet body, the thickness of the lower sheet is more excellent in the overlapped portion of the sheet edge portions. There is an advantage that a three-dimensional effect can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a sheet roof to which a roofing waterproof sheet according to the present invention is applied.

FIG. 2 is a sectional view showing a waterproof sheet according to the present invention.

FIG. 3 is an enlarged cross-sectional view showing a periphery of a streak projection in a waterproof sheet according to the present invention.

FIG. 4 is a plan view showing a waterproof sheet according to the present invention.

FIG. 5 is a plan view showing a first modification of the waterproof sheet according to the present invention.

FIG. 6 is a plan view showing a second modification of the waterproof sheet according to the present invention.

FIG. 7 is a plan view showing a third modification of the waterproof sheet according to the present invention.

[Explanation of symbols]

 2: Roof base 10: Roofing waterproof sheet 20: Sheet body 21: Sheet surface 25: Fiber reinforced layer 26: Concavo-convex pattern 30: Streak-like projections 31: Eaves side 31a: Inset 32: Building side h: Projection height w: Projection width P: Projection interval X: Purlin direction Y: Gradient direction θ: Inclination angle

Claims (11)

[Claims] 1. A roofing waterproofing sheet laid on a sloped roof base to form a roof, comprising: a sheet body made of a waterproof high-polymer material; Are integrally formed in a form extending in a streak shape along the surface, and have a height of 1.0 to 20 mm and a width of 1.0 to 5
A roofing waterproofing sheet having 0 mm streaks. 2. A plurality of the streak-like projections extend in a direction (purlin direction) orthogonal to a direction in which the slope is provided (gradient direction), and are provided in parallel at predetermined intervals in the slope direction. The waterproofing sheet for roofing according to claim 1. 3. The soft polymer material is made of a soft synthetic resin selected from a soft polyvinyl chloride resin, a polyolefin resin, a vinyl chloride thermoplastic elastomer, and a polyolefin thermoplastic elastomer. 3. The waterproofing sheet for roofing according to 1 or 2. 4. The waterproofing sheet for roofing according to claim 1, wherein a fiber reinforcing layer is interposed in the middle of the sheet body in the thickness direction. 5. The roofing waterproof sheet according to claim 1, wherein a number of uneven portions are formed on the surface of the sheet body. 6. The roofing waterproof sheet according to claim 1, wherein the streak-like projections are formed in a substantially square cross section. 7. The roofing waterproof sheet according to claim 6, wherein a lower side surface (eave tip side) of the streak-like projection in a gradient direction is formed substantially perpendicular to a surface of the sheet body. 8. An upper side (ridge side) of the streak projection in the gradient direction is formed so as to be inclined toward the eaves tip side, and an inclination angle of the side surface with respect to the surface of the seat body is set smaller than a right angle. The waterproofing sheet for roofing according to claim 6 or 7, which is made. 9. A side surface on the eaves tip side of the streak projection,
The roofing waterproof sheet according to any one of claims 6 to 8, wherein a corner formed between the sheet and the surface of the sheet body is formed in an arc shape. 10. An interval between adjacent streaks is 100.
The roofing waterproofing sheet according to claim 2, wherein the waterproofing sheet is set to a thickness of from 1000 mm. 11. The roofing waterproofing sheet according to claim 2, wherein the streak-like projection is provided at a position corresponding to an edge on the eaves tip side of the sheet body.