JP2011074649A - Roof structure, and sheet metal member for use in the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roof material laid instead of odd tiles commonly laid at the side of a ridge in conventional clay tile roofing. <P>SOLUTION: A sheet metal member 3 is laid long sideways instead of the odd tiles in a roof structure 1 having a pitched roof on which the odd tile is laid between a pantile 21 and a ridge tile 26. Work for cutting tiles when the side of the ridge is not settled with a true material is thereby dispensed with, and since the number of tiles is replaced with the sheet metal member 3, a material cost can be reduced. As the same constitution, a sheet metal member is laid instead of the odd tiles in a roof structure having a pitched roof with the odd tiles laid near an intersecting part of three roof faces where a corner ridge and a main ridge intersect. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a roof structure in a ridge of a roof covered with roof tiles and a member used for the roof structure.

In general, the construction of a roof material in a house is performed according to various types such as the type, gradient, shape, and size of the roof. Recently, efforts have been made to reduce the amount of waste generated at home construction sites as much as possible, and many methods and systems have been devised.

  In roof tiles, as in the invention described in Patent Document 1, for example, a roofing method (hereinafter referred to as a system construction method) according to a certain law is being adopted so that it is difficult for waste to be generated on site, and is spreading. . As shown in FIG. 13, a plurality of tiles (work tiles that spread over a special part of the roof) that are used in the corner building 13 and have a working width based on a certain rule are made into parts, and the working length is changed for each roof gradient. Put the corner building by setting. As a result, the amount of tiles to be cut in the corner building is reduced compared to the previous method of roofing tiles, and it has become possible to significantly reduce waste, especially on the dormitory roof.

JP2002-188246

  However, the roofing by the system method as described above is not limited to the invention of Patent Document 1 and has the following specific problems. In the system construction method, the corner ridge is constructed according to certain rules, so the working length of the roof tile is fixed by the slope. Since roof roof tiles have various working lengths, the roof tiles have a fixed working length, so when the tiles are delivered to the end of a large building, there are many cases where it is not possible to store the roof tiles or the functional tiles as they are (generally flat plates). In the method of laying roof tiles or flat roof tiles, the working length can be adjusted somewhat, so it was possible to assign roof tiles so that half-lengths would not occur at the end of large buildings). As shown in FIG. 14, in this state, it was necessary to cut all the roof tiles and working roof tiles that reach the uppermost stage according to the half-end length. This work requires a lot of work such as generation of dust when cutting, generation of waste material of unnecessary parts, addition of drilling work to provide nail holes that have disappeared due to cutting, etc. There was a problem. Furthermore, even when the half-length is small, one roof tile must be used and cut, which is a waste.

  Therefore, in the case of roofing by the system construction method, we intensively studied to propose a roofing material that can be roofed at low cost and saves labor regardless of the half-length generated at the edge of the building. We found the fact that a special member corresponding to the situation should be newly set. Accordingly, an object of the present invention is to provide a roofing material that can be used in place of a half-end tile at the ridge, which is common in conventional tile roofing.

  In order to solve the above-mentioned problems, the present invention has a structure in which a sheet metal member is installed horizontally in place of the half-end tile in a roof structure having a sloped roof in which a half-end tile is placed between a cross tile and a crown tile. Is adopted.

  By adopting the above configuration, the working length adjustment range of the sheet metal member can be set widely, and when a half-end length occurs near the large building, the sheet metal member can be removed without cutting the roof tile and spreading the half-end tile. It can be used as an alternative, and roofing can be completed up to the large building without cutting work.

  As a similar configuration, in a roof structure having a sloped roof where half-edge tiles are laid near the portion where the three roof surfaces where the corner ridge and the large ridge intersect, a sheet metal member is installed instead of the half-end tile. The configuration is adopted.

  By adopting the above configuration, even when a half-length occurs near the intersection of the main building and the corner building, a sheet metal member is used as an alternative to the half-end tile cut from the roof tiles and the functional tiles. Roofing near the intersection with the building can be completed. This configuration is particularly effective for laying the building roof at the ridge end.

  In addition, the sheet metal member according to the present invention has a length in the flow direction that is 1/3 of the total length of the roof tile and equal to or less than the total length. In addition, by adopting the means that it has an overlap of a predetermined length or more in the flow direction with the roof tile installed in the lower stage, and is fixed to the ridge rafter and covered with the crown tile, only the working width of the crown tile An unsatisfactory waterproof performance can be secured, and a sheet metal member having an optimal dimension can be provided.

  Furthermore, by adopting the means that the fixed height to the ridge rafter has a ridge that has a variable structure, the return gradient depending on the vertical position of the roof tiles and / or the tiles to be laid in the uppermost stage It is not limited to (described later), and can be stored neatly. The variable structure is mark is provided so as to advance the folding position is known, notches and grooves, the determination of the position folded along a line or the like has been made, the prospect is likely erected position folded during processing.

The above-described roof structure is a horizontally long sheet metal member that is sown instead of a half-end tile that is laid between a roof tile and a crown tile, and the sheet metal member is located below the main body portion and the head-side long side of the main body portion. It is configured by adopting a sheet metal member formed of an extending head finding surface and a flange portion integrally formed with the main body portion and having a fixed height to the ridge rafter having a variable structure.

  According to the roof structure of the present invention, in the roof structure of a tiled roof in which the working length of the roof tile is determined, such as a system construction method, the sheet metal member is constructed in place of the half-finished tile, so it is troublesome to cut the roof tile and the working tile Can be used as a substitute for a plurality of roof tiles and functional tiles, so that the cost of materials can be greatly reduced.

  According to the sheet metal member of the present invention, it is possible to provide the above-described roof structure, and the effect of hardly generating waste on site is exhibited.

The perspective view of the sheet metal member concerning the present invention is shown. Similarly, a plan view is shown. Similarly, a side view is shown. The other Example of the side view which concerns on this invention is shown. The enlarged view of the collar part of the sheet metal member concerning the present invention is shown. Similarly, another embodiment of the enlarged view of the buttocks is shown. Similarly, another embodiment of the enlarged view of the buttocks is shown. Sectional drawing of the roof structure using the sheet-metal member based on this invention is shown. The roof structure using the sheet-metal member which concerns on this invention WHEREIN: Sectional drawing of the state in which half end length does not generate | occur | produce is shown. Sectional drawing in the state where half-end length is large is shown in the roof structure using the sheet metal member concerning the present invention. The front view of the other Example of the sheet-metal member based on this invention is shown. Similarly, the right side view is shown. Similarly, a plan view is shown. Similarly, a perspective view is shown. An external view of a typical dormitory roof is shown. The perspective view of the conventional dormitory roof is shown. Sectional drawing of the conventional roof structure is shown.

The best mode for carrying out the present invention will be described below with reference to FIGS. In the present invention, the roof tile refers to a thick roof material such as a ceramic tile or a cement tile, and may simply be a tile. As shown in FIG. 12, in the roof part, the large ridge 12 refers to the highest portion extending in the horizontal direction among the roofs constituted by two roof surfaces, and the corner ridge 13 is a flat portion 10a (10c). -The two roof surfaces of the small flat part 10b cross at an obtuse angle, and say the site | part extended in the diagonal direction with respect to the big ridge 12. FIG. The building side refers to the vicinity of the large ridge 12 and the roof tiles sown at the top unless otherwise specified. The half-length 16 here is the length of roofing that is required from here, excluding the working length of the roof tiles that have been sown from the eaves to the uppermost level. ) Is the length that does not fit. The half-end tile 22 is a tile placed at the half-end length 16 described above and fits in the most part of the building, and cannot fit in the real thing. Therefore, the roof tile is cut with the head side remaining a predetermined length according to the half-end length 16. Say. In the present invention, this expression is used for both the roof tile 21 and the working tile (a dedicated tile that goes to a special part of the roof such as the adjustment corner tile 25). The length in the present invention refers to the flow direction between the eaves on the roof surface, and the width refers to the direction of the rows.

Example 1
As shown in FIG. 5, the basic roof structure 1 of the present invention is constructed such that a pier 50 is constructed on a field board 10 with a tile working length pitch, and the top of the field board constituting the roof has a purlin support. 51 is constructed. A ridge rafter 52 for supporting and fixing the ridge tile 26 is further attached to the upper part of the ridger bracket, and a waterproof tape 53 is applied so as to cover the sheet metal member 3 constructed on the two roof surfaces across the ridge, The sheet metal member 3 is constructed instead of the half-end tile 22. Finally, the roof tile 26 is fastened to the roof rafter 52, and the basic storage of the roof structure 1 is completed.

1 to 3b, the basic structure of the sheet metal member 3 has a finding surface 32 that extends downward from the head side end of the main body 31, and further extends in the ridge direction from the lower end of the finding surface. A folded portion 33 is provided, and an elastic sealing material 54 is provided on the lower surface thereof. Further, a water return 34 extending upward from the bottom end portion of the main body 31 is formed up and provided with a nail hole 43 for fastening to the ridge rafter 52, and a collar 35 is provided further upward. . The elastic sealing material 54 is made of, for example, ethylene-propylene-diene rubber (EPDM).

As shown in FIGS. 4 a to 4 c, the flange 35 has a rising surface 37 continuously formed with the upper end of the water return 34 as a base point 36, and a horizontal surface on the side opposite to the main body 31 via a bent portion 38. It has a horizontal part 39 extending in the direction. A mark 40 is provided on the rising surface 37, and the mark includes a notch 41, a groove 42, a line, etc. in order to improve workability for changing the mounting height of the sheet metal member 3 described later. Using the means, the bending position can be confirmed at a glance.

  Next, each part of the sheet metal member 3 will be described in detail. The width of the sheet metal member is preferably a working width corresponding to 3 to 6 pieces of the roof tile. The sheet metal member 3 replaces the half-end tiles 22 and spreads the roof. However, the number of sheet metal members 3 increases and the construction becomes troublesome when the working width is about one sheet of the roof tiles. On the other hand, for example, if the working width is 8 to 10 sheets of the roof tile, it is too long, it becomes difficult to handle, transport, manage and construct, and it becomes difficult to process the sheet metal member 3. Therefore, if the length of the sheet metal member 3 is about five working widths of the roof tile, it is suitable in terms of construction labor and cost.

  The length of the sheet metal member 3 is preferably about 1 to 3 to 1 in the total length ratio of the roof tile 21 at the base portion 31 base. If the total length of the roof tile is 350 mm, the length of the sheet metal member is 117 to 350 mm. The working width of the roof tile 26 in the flat roof tile is actually about 200 mm to 240 mm although there is no JIS standard or the like, and the width of the working width of the roof tile 26 that can cover the two roof surfaces constituting the large building 12 is as follows. In consideration of the width of the ridge rafter and the like, the width of the ridge tile is approximately 90 mm. When the roof tile 21 is delivered to the ridgeline in real size, the range of the roof tile 26 covered by the roof tile 26 is approximately 50 mm on the bottom side of the roof tile. Considering the gradient elongation rate of the main body (with respect to the calculation of the height of the roof tile on the horizontal basis) and the above-mentioned covering range of 20 mm, further looking at the covering margin, The total length ratio of the roof tile 21 is 1/3 or more. In the above case, the sheet metal member is an example of the shortest length. However, when the sheet metal member is the longest, it is up to the full length of the roof tile 21 that makes sense as an alternative to the half-end tile 22, and the total length exceeds 1. In this case, the length of the sheet metal member 3 is about 1/3 to 1 of the overall length of the roof tile 21 because it is better in terms of strength and aesthetics to put one true roof tile than to make the sheet metal member 3 longer. It is sufficient and can accommodate any half-length.

  It is preferable that the height of the finding surface 32 that hangs downward from the eaves side end of the main body 31 of the sheet metal member 3 is about 10 to 15 mm. By providing this finding surface, it is possible to improve the rain performance. Since the finding surface 32 has a steep slope substantially perpendicular to the main body 31, when the rainwater received by the main body 31 flows down in the eaves direction, the flow rate of rainwater can be increased on the finding surface 32. As a result, rainwater can flow down in the direction of the eaves without entering the roof. Furthermore, since the finding surface 32 is configured by a surface different from the main body 31, it has strength against external forces such as twisting of the sheet metal member 3. And the appearance surface of a roof tile can be reproduced in a pseudo manner, the entire roof has a sense of unity, and a finish comparable to that of a homogeneous roof material is possible, so that the design surface is excellent.

The folded portion 33 is formed by being folded back in the ridge direction from the lower end of the finding surface 32, and an elastic sealing material 54 is attached to the surface of the folded portion 33 that faces the roof tile. Thereby, after the rainwater received by the main body 31 flows down and travels through the finding surface 32, the rainwater does not enter the inside of the roof, and the waterproof performance can be further improved. The same applies to the folded portion 33 not in the ridge direction but in the eaves direction. Note that the folded portion 33 is not necessarily required, and it is possible to paste it directly on the roof tiles and take the rain, but by setting the folded portion 33 and the elastic sealing material 54 in advance, the construction at the site can be performed. The troublesomeness disappears.

On the other hand, the water return 34 extending upward from the ridge side end of the main body 31 is provided with a height of about 5 to 20 mm, and rainwater received on the main roof 31 or the roof tiles that are sprinkled on the lower side is caused by wind or the like. And the sheet metal member 3 is prevented from entering the roof surface through a gap. In order to further improve the waterproof performance, the entire upper end of the water return 34 excluding the flange portion 35 may be bent in the direction of the eaves and formed in a spiral shape.

  A hook 35 that can be hooked on the ridge rafter 52 is provided above the water return 34. The flange portion 35 is integrally formed with the main body portion 31, the finding surface 32, and the like. A rising surface 37 is formed about 10 to 40 mm with the upper end of the water return 34 as a base point 36, and further extends about 10 to 20 mm in the horizontal direction opposite to the main body 31 via the bent portion 38. The rising surface 37 between the base point 36 and the bent portion 38 is provided with a mark 40 for adjusting the height of the main body 31, and the mounting height of the main body 31 can be changed.

The mark 40 has an object of making it easy to process the sheet metal member 3 at the site and unifying the folding position when it is desired to change the mounting height of the main body 31. The return slope of the roof tile (the roof tile itself is thick and overlaps in the length direction, so the tile surface where the slope is discontinuous becomes looser than the roof surface where the slope is continuous. It is necessary to change the mounting height according to the remaining half-end length, and the distance between the field ground and the roof surface of the half-end tile will change. Thus, the marks for processing the sheet metal member 3 are provided at predetermined intervals or at predetermined positions.

As the form of the mark 40, as shown in FIGS. 4a to 4c, both ends 37a of the rising surface 37 have a substantially rectangular notch 41 at a predetermined interval or a substantially triangular notch 41 having both ends 37a as bases, A groove 42 or a line is provided in the entire width of the rising surface 37 so that the processing position of the flange 35 can be seen at a glance. If there are about two marks, such as notches, the height can be adjusted in three steps, and the height can be adjusted regardless of the half-end length 16, but the present invention is not necessarily limited thereto.

  The material of the sheet metal member 3 is preferably a material excellent in durability and corrosion resistance, such as a material coated with a stainless steel plate or an aluminum-zinc alloy plated steel plate. Many parts of sheet metal members are exposed to solar radiation, but it is preferable to select materials that do not easily deform, corrode, or deteriorate as roofing materials because they are replaced by roof tiles. is there. The thickness of the sheet metal member 3 is selected to be about 0.3 mm to 0.6 mm in consideration of practical aspects and the like.

  The color of the sheet metal member 3 is variously set to be the same color or similar color to the roof tile. By making the color the same as or close to the color of the roof tile, only the sheet metal member of the entire roof is not different in color, and even if it is not a homogeneous material, it is inconspicuous. Therefore, even if a sheet metal member is used, roofing that is inferior to a tiled roof is possible on the entire roof.

  The construction method of the present invention will be described below. FIG. 5 is a sectional view of a basic roof structure 1 embodying the present invention. While the true roof tile 21 and the roof tile 26 are less covered, the half-end length 16 is short, so that the half-end tile 22 accommodated here is smaller. With small half-edge tiles, the amount of waste generated by cutting the tiles is large, and it is difficult to open the nail holes in the roof tiles lost due to the cuts. In this invention, the merit of low cost and labor saving in such a case is great. FIG. 6 is a cross-sectional view of the roof structure 1 in a case where the roof tiles are stored as real objects up to the building. In this case, there is basically no half-end length 16 and there is no significant problem with the rain or aesthetics even if there is no building sheet metal 3, but if the sheet metal member 3 is present, the effect is more effective on the waterproof surface. FIG. 7 shows a cross-sectional view of the roof structure 1 when the half-end length 16 is large. In this case, since the distance from the building to the true roof is wide, the mounting position is lowered so that the gradient of the sheet metal member 3 is not stiff. In addition, in a present Example, the case where a half edge tile generate | occur | produces is shown in the building roof which is a general roof shape which employ | adopted the system tile. In the case of a gable roof, the corner building 13 does not exist and the system construction method is not necessarily adopted. However, if the generation of half-end tiles is unavoidable by adjusting the working length, such as the flow length is short, it corresponds to this embodiment. It shall be.

Since the present invention is an invention related to the building, the construction method for the general part is omitted. However, the building 50 is constructed with the pier 50 and the purlin support 51 as the groundwork. It is assumed that a rafter 52 is attached.

If it is installed near the ridge, the occurrence of a half-length of 16 may be unavoidable due to the relationship between the flow length of the roof and the working length of the roof tile. Conventionally, a true roof tile is cut and stored in this half-end length 16, but in the present invention, the sheet metal member 3 is attached in place of the roof tile to be cut. First, based on the half-end length 16, the attachment height of the buttocks to the ridge rafter is set. In the example of FIG. 4a, since the horizontal portion 39 and two places of marks are provided, the state in which the notch 41 does not process the flange portion 35 and the total three stages of processing any of the two places of marks can be adjusted. In consideration of the return gradient, when the half end length 16 is short, the flange portion 16 is attached as it is, and as the half end length 16 becomes longer, the upper notch 41a, the lower notch 41b and the machining position are changed, Lower the entire body, especially the bottom side. In the processing, the horizontal portion in the initial state is bent once using a sheet metal scissors or the like so as to be substantially flush with the rising surface, and is bent again at the position of the mark as necessary to form the horizontal portion 39. Next, the horizontal part 39 is hooked on the upper surface of the ridge rafter 52 to fix the water return or the rising surface to the side surface of the ridge rafter. At least two or more places are fixed to either the rising portion or the horizontal portion, and the sheet metal member 3 is brought into a stable state. Finally, the roof tile 26 is rolled and fixed with screws or the like. Since the ridge tile 26 is fixed in a state of covering the sheet metal member 3, the ridge tile 26 is fixed to the ridge rafter 52 against the floating of the sheet metal member.

As described above, when half-end tiles 22 are generated in the construction of the roof of the roof, labor can be saved in labor by cutting the sheet metal member 3 over the roof as an alternative without cutting the tiles. While achieving cost reduction, it is possible to create a roof structure with the same appearance and the same appearance as a roof tile of the same quality.

(Example 2)
Here, as another embodiment of the present invention, a sheet metal member attached to the end of a building where a large building and a corner building appear on a roof such as a dormitory roof shown in FIGS. 8 to 11 will be described. As a basic shape, as shown in FIG. 12, the difference from the first embodiment is that the three roof surfaces of the flat portion 10a, the small flat portion 10b, and the flat portion 10c, which are found on the dormitory roof, can be covered. A substantially U-shape is formed so as to wrap the ridge end of the rafter 52. In addition, the collar portion 35 is provided so as to face each other with the ridge rafter 52 interposed therebetween, and the other basic shapes are the same as those in the first embodiment. In consideration of the processing of the horizontal portion 39, the facing flange portions 35 may be shifted from each other. In addition, the code | symbol a, b, and c shall be attached | subjected as a classification | category for the main-body part and finding part of the sheet-metal member 3 in a present Example.

  The structure of the sheet metal member 3 includes a flat portion main body 30a (30c) covering the flat portion of the roof surface and a small flat portion main body 30b covering the small flat portion as main bodies, and further, a finding surface 31a (31c) and 31b is provided. A water return 34a (34c) and a flange 35a (35c) are provided at the ridge side end of the main body, and the water return has an interval of about the thickness of the rafters. It is designed to fit into the edge of the ridge rafter. Note that the gap between the flat main bodies 30a and 30c is preferably about 40 to 50 mm in consideration of the thickness of the purlin support 51 and the like in the ridge rafter 52 because the ridge rafter 52 enters.

  The structure of the sheet metal member may be about 1 to 3 working widths of the roof tile 21 in the main body 30a (30c) covering the flat portion 10a (10c), and the main body 30b covering the small flat portion 10b is the top of the small flat portion. It suffices if it can cover the substantially triangular roof surface. In general, there are various lengths of the main building 12 even if it is called a dormitory roof. In a dormitory roof where the plan view of the roof is close to a square, the length of the large ridge 12 is only a few working widths of the roof tile 21. Since there are not a few examples, the lengths of the main body portions 30a and 30c may be short so as to be compatible with these roofs. In addition, two or more collar portions 35 are provided in accordance with the length of the main body portion 31 so that they can be locked to the ridge rafter 52. The sheet metal member 3 of the present embodiment can be used together with the sheet metal member of the first embodiment to cover the entire roof ridge.

  The sheet metal member of the present embodiment is substantially U-shaped and has an inclination that matches the slope of the roof surface to some extent, so it is difficult to integrally form the sheet as it is, so it is divided into several parts. After being processed and molded, a U-shaped sheet metal member may be formed by connecting by riveting or the like. In addition, it is not limited to this manufacturing method, The best method is employ | adopted suitably.

  The construction of the sheet metal member of the present embodiment is basically the same as that described in detail in the first embodiment. The construction at the ridge end where the two corner ridges 13 and the large ridge 12 intersect each other is to fit the opening of the U-shaped sheet metal member 3 into the ridge end until the hook 35 is caught by the ridge rafter 52. At this time, the flange portion 35 is bent in advance according to the half end length 16. When the sheet metal member 3 is fitted, it is fixed to the ridge rafter using a screw or the like. Finally, the roof tile 26 and the roof tile (not shown) are fixed to the roof rafter 52 and the construction is completed.

  In addition, although the specific example of the structure and construction method of the sheet-metal member 3 in this invention was demonstrated, this invention is not limited to said favorable example, In the range which does not deviate from the fundamental technical idea, it can change suitably. it can. For example, a sheet metal member corresponding to a special part of the roof shape, such as a different ridge roof, a single-flow roof, or a wall of a lower house, may be set. Moreover, the same effect as the present invention can be exhibited even in a shape that can cover the roof of the two ridges so that the two roofs constituting the large ridge can be covered like a ridge tile.

  INDUSTRIAL APPLICABILITY The present invention can be widely applied to a construction method for a ridge, a roof structure for a ridge, and the like in roofing with a thick roof material such as a roof tile.

DESCRIPTION OF SYMBOLS 1 Roof structure 10 Roof 11 Base plate 12 Large building 13 Corner building 16 Half edge length 21 Bar roof tile 22 Half edge tile 25 Adjustment corner roof tile 26 Roof tile 3 Sheet metal member 31 Main body part 32 Finding surface 33 Folding part 34 Water return 35 Anchor part 36 Base point 37 Standing surface 37a Both ends 38 Bent part 39 Horizontal part 40 Marking 41 Notch 42 Groove 43 Nail hole 50 Plinth 51 Purlin support 52 Mouth rafter 53 Waterproof tape 54 Elastic seal material

Claims (8)

  A roof structure having a sloped roof in which a half-edge tile is laid between a roof tile and a crown tile, wherein a sheet metal member is installed horizontally in place of the half-end tile. In a roof structure having a sloped roof in which half-end tiles are laid near a portion where three roof surfaces intersecting a corner ridge and a large ridge cross, a sheet metal member is used instead of the half-end tile. Roof structure.   The roof structure according to claim 1 or 2, wherein the sheet metal member has a length in a flow direction of 1/3 of a total length of the roof tile and equal to or less than the total length.   3. The sheet metal member according to claim 1, wherein the sheet metal member has an overlap of a predetermined length or more in a flow direction with a roof tile installed in a lower stage, is fixed to a ridge rafter, and is covered with a crown tile. Roof structure. The roof structure according to claim 1 or 2, wherein the sheet metal member has a flange portion that has a variable height structure for fixing to the ridge rafter. The roof structure according to claim 5, wherein the collar portion is provided with a mark that does not require height measurement. The roof structure according to claim 6, wherein the mark is formed by a notch.   A horizontally long sheet metal member that is sown instead of a half-end tile that is sown between a roof tile and a crown tile, wherein the sheet metal member includes a main body part and a head finding surface that extends downward from the head-side long side of the main body part. A flat plate member comprising: a flange portion integrally formed with the main body portion and having a variable height fixed to the ridge rafter.