JP4792059B2 - Shielding sheet for roof - Google Patents

Description

The present invention is laid or to stretched the roof of the building while decreasing solar heat conduction efficiently, which relates to the roof blocking sheet for blocking rain or the like, direct the member to particularly form the roof lowering the indoor temperature to prevent the temperature becomes high by sunlight, as well as a perfect energy-saving measures and prevention of global warming, it relates to a roof shielding sheet may reduce the rain.

  Conventionally, a roof of a building such as a house, a building, or a factory or a warehouse is usually directly exposed to sunlight, and such a roof becomes high temperature by direct sunlight, and the heat is conducted and the room becomes high temperature. Especially in metal roofs such as folded plate roofs and tin roofs, the temperature rise is remarkable. If the room temperature rises, the operating time of air conditioners and the like will increase, and the amount of electricity used will increase, leading to global warming.

  As a countermeasure against such a high temperature, there is a conventional one that improves ventilation of the space in the attic space to ventilate and blocks the influence from the roof. Moreover, the actual situation is that the roof itself has a heat insulating structure, and heat conducted from the roof is cut off to prevent the indoor temperature from rising.

  However, the conventional method for improving ventilation through the attic space has a problem that the structure of the building is complicated and the construction cost is increased. In addition, when a fan or the like is used for ventilation, there is a problem that running cost is required and maintenance is required.

  On the other hand, the method of using a roof as a heat insulating structure has a problem that the construction cost increases because the roof structure itself is complicated and a material for heat insulation is incorporated. Moreover, when it constructs on the roof of a ready-made building, it will be the reconstruction of the whole roof, and there also exists a problem that construction cost will rise.

  Therefore, it is impossible to apply any of these methods to buildings such as factories, large stores, warehouses, garages, etc., especially in the case of metal roofs using roof tiles or folded plates. The direct sunlight causes a significant increase in heat and affects the room, so there is a problem with its effect.

  There is also a technique of coating a roof with a heat-resistant paint that reflects light or the like and reduces heat absorption. However, since the heat-resistant paint reflects light, there is a problem that the reflected light reaches a nearby building or road, causing a temperature rise or being dazzled by the reflected light. And when heat-resistant paint is applied to the roof, the surface area of the roof is usually larger than the flat area, so in some cases, it is necessary to apply at least 1.5 times the flat area, which increases the cost of painting. . Furthermore, although there is an effect of heat insulation immediately after coating, there is also a problem that heat absorption increases as the surface becomes dirty.

  For this reason, there is a strong demand for the development of a method that efficiently lowers the indoor temperature of a building with a relatively simple method with no performance degradation, no environmental impact, and low cost. Preventing building temperature rises due to solar heat and lowering the room temperature will lead to lower power consumption, and will contribute to the prevention of global warming.

  In addition, in the case of a metal roof, depending on the roof structure, when it rains, the rain directly hits the roof surface. There is also. For this reason, in areas where heavy rains frequently occur, even if it rains, the indoor rain noise is low, and there is a strong demand for quiet indoor work.

The present invention has been made under the circumstances as described above, and an object of the present invention is to provide a roof blocking sheet that suppresses a rise in the temperature of the roof or naturally cools, and blocks rain and the like. By laying or stretching the roof sheet on the ready-made roof, the roof itself can be protected from direct sunlight by a simple structure, and the roof (indoor) can be heated by natural cooling. Prevent it efficiently and efficiently .

In addition, when heavy rain falls, there is also a soundproofing effect that significantly suppresses the propagation of the sound into the room .

The present invention relates to a roof blocking sheet, and the object of the present invention is to provide a plurality of transmission holes having a diameter of 80 to 150 mm in a rectangular sheet of polyethylene resin having heat blocking characteristics and rain and light blocking characteristics. The aperture ratio of the entire transmission hole is 3 to 8% with respect to the rectangular sheet material, the thickness of the rectangular sheet material is 0.2 to 2.0 mm, and the end portion has a diameter. It is accomplished by being reinforced with ropes made of polyethylene resin 2.0 to 6.0 mm, or is more accomplished by providing a further eyelet to the end.

  The roof blocking sheet of the present invention is a sheet having a heat shielding property in which permeation holes are regularly arranged or scattered and has a characteristic of blocking light and rain, and is easily laid or stretched on a metal roof. It is excellent in durability and heat resistance, and if it is laid or stretched with a space on the roof, it can dissipate heat due to reflection from the sheet and naturally generated airflow, suppressing temperature rise, and direct sunlight It is possible to efficiently prevent the temperature rise caused by the above.

  In addition, the roof where the roof blocking sheet is laid or stretched has a space between the roof top surface and the roof blocking sheet, and the airflow is naturally formed by the permeation holes provided in the roof blocking sheet. In addition, heat flow due to direct sunlight can be reduced or suppressed, and the roof can be prevented from being heated due to direct sunlight shining on the upper surface of the roof. Wind (air) enters and exits the space formed between the top surface of the roof and the roof barrier sheet, ventilates the air and cools the roof. This prevents the roof barrier sheet from rising, In addition, it is possible to prevent the roof blocking sheet from being damaged, and further, there is an effect of draining rainwater or the like accumulated in the roof blocking sheet from the permeation hole. When the wind blows, the flow velocity on the upper surface of the seat is faster than that on the lower surface of the seat, so that lift occurs due to the airflow. However, since 3 to 8% of the holes are formed in the sheet, the lift is canceled out, and the sheet can be prevented from being lifted or fluttered.

  Such operational effects of the present invention are not artificially or mechanically performed, but are performed as they are, so that there is an economic effect that does not require running costs.

  Furthermore, although the roof of the present invention uses a combustible polyethylene resin as a roof blocking sheet, it has a thickness of 0.2 to 2.0 mm, so it is laid or stretched on a roof of 0 to 30 degrees. When installed, the heat propagation function of the sheet is attenuated or lost, and the temperature rise of the sheet is suppressed, so that it acts as a non-combustible material and satisfies the requirements of the Building Standard Law.

  In the present invention, a plurality of transmission holes having a diameter of 80 to 150 mm are arranged on a sheet material having a heat shielding characteristic (a characteristic that reflects and does not absorb heat) and rain and light shielding characteristics, and the aperture ratio of the entire transmission hole is The roof blocking sheet, which is 3 to 8% of the sheet material, is laid or stretched with a space (about 50 to 90 mm) on the roof. The roof shielding sheet has excellent durability and heat resistance, blocks sunlight and rain, and naturally occurs in the reflection of the roof shielding sheet itself and in the space (gap) between the roof shielding sheet and the roof surface. A heat radiation (cooling) action is generated by the air flow, and a temperature rise due to direct sunlight can be suppressed, and an indoor temperature rise based on the direct sunlight can be efficiently prevented.

  Even if it rains, most of the rain reaches the roof surface after colliding with the shielding sheet, so that most rain noise is blocked by the roof shielding sheet. For this reason, the rain sound of a roof can be suppressed significantly.

  The roof sheet can be easily laid or stretched on the roof (tile bar or folded plate) directly on the ready-made metal roof or via a fastener, so there is no need to remodel or renovate the ready-made roof. It is very cheap.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a plan view of a roof blocking sheet 10 according to the present invention. The sheet material of the roof blocking sheet 10 has a heat blocking characteristic and a polyethylene resin (polyethylene 92.0) having a blocking characteristic against rain and light. To 97.0% by weight, 1.0 to 3.0% by weight of organic additives such as amines or phenols, and 0.5 to 5.0% by weight of inorganic additives such as pigments and calcium carbonate). It has a rectangular sheet shape having a width of about 3 to 8 m, a length (depth) of about 1.5 to 6 m, and a thickness of about 0.2 to 2.0 mm (desirably 0.4 to 0.8 mm). A plurality of circular transmission holes 11 having a diameter of about 80 to 150 mm (desirably 100 to 120 mm) are regularly (lattice-shaped) arranged at a predetermined pitch on the entire surface of the roof blocking sheet 10. Brass eyelets 12 used at the time of laying or laying on the roof are provided at a predetermined pitch on the periphery of the shielding sheet 10 for use.

  The opening ratio of the entire through hole 11 with respect to the entire surface of the roof blocking sheet 10 is about 3 to 8%, and preferably 4 to 6%. The aperture ratio of the entire transmission hole 11 with respect to the sheet is determined by the diameter and number of the transmission holes 11, and is generated through the heat reflection effect of the roof blocking sheet 10 and the space between the roof blocking sheet 10 and the roof surface. The aperture ratio is about 3 to 8%, preferably 4 to 6%, because of natural cooling by the airflow. When the aperture ratio is less than 3%, natural cooling by the air flow is inhibited, and when the aperture ratio is greater than 8%, the heat reflection effect is reduced and the shielding effect against light and rain is reduced.

  In addition, in this example, although the permeation | transmission hole 11 of the blocking sheet 10 for roofs is made circular, even if it is a rectangle, a triangle, and a polygon, what is necessary is just the said aperture ratio 3-8%. The material of the roof shielding sheet 10 is preferably the above-mentioned polyethylene-based resin, but various fabric sheets, vinyl sheets, rubber material sheets, etc. can also be used, have heat shielding properties, light resistance, heat resistance and durability. It may be any material that can withstand rain, wind, rain, snow, and the like.

  Further, the eyelet 12 is for fixing and attaching to a folded plate of a metal roof. In the case of a screw-type folded plate, the eyelet 12 can be used for fixing with screws or bolts and nuts. The stacked folding plate is not necessarily required because the end portion is folded and used by being sandwiched between fixing members such as angle members. Moreover, even if it is not an eyelet, it may be a hole that can be fixed with screws or bolts and nuts.

  In the present invention, such a barrier sheet 10 for a roof is laid or stretched on a ready-made metal roof, for example, a roof made of a closed-type folded plate or a stacked folded plate, or a roof on which tiles are arranged. The height from the roof surface of the hose-type folded plate or the stacked-type folded plate is about 50 to 90 mm, and this forms a space for airflow between the roof blocking sheet 10 and the roof-type folded plate. When the height is low, such as a tile, a space (gap) of about 50 to 90 mm is formed between the roof and the roof surface by laying or stretching through a high-level fastener.

  The inclination of the metal roof is usually not less than 0 degrees and not more than 30 degrees. Then, when laying or stretching the roof blocking sheet 10, the end portion (peripheral portion) may be reinforced with an end portion reinforcing material such as a polyethylene rope in order to reinforce the end portion. The diameter of the end reinforcement is about 2.0 to 6.0 mm, preferably 3.0 to 5.0 mm. Polypropylene is usually used as the end reinforcement rope, but the same polyethylene as that for the roof blocking sheet 10 is desirable from the viewpoint of recycling.

  FIG. 2 shows an example in which one roof blocking sheet 10 is laid or stretched on a metal roof 20, FIG. 2 (A) is a plan view, and FIG. 2 (B) is a front view (details are shown in FIG. 2). 3) and FIG. 2C are side views (details are FIG. 4). The roof 20 is composed of a plurality of folded plates 21 of a top-down type or a stack-type, and steel tight frames 24A and 24B are provided on the upper and lower portions of the roof 20, and the end surface portion of the roof 20 is provided. The separation distance L1 from the roof blocking sheet 10 to about 500 mm or more. The reason why the separation distance L1 is provided is that heat dissipated by the airflow becomes larger when the end portion is separated than when the entire roof surface is covered. It is effective to cover 70 to 90% of the roof area with the roof blocking sheet 10.

  Then, a fastener 22 is interposed at the top of the folded plate 21 and fixed with bolts and nuts (or screws) 23. In this case, the eyelet 12 is used in the case of a screw-type folded plate, but in the case of a stacked type folded plate, a roof blocking sheet without the eyelet 12 is used, and the end portion is folded and a fixing member such as an angle member is used. Use to fix. Details thereof will be described later.

  FIG. 5 shows an example in which four roof blocking sheets 10A to 10C are laid or stretched on the metal roof 20, FIG. 5 (A) is a plan view, FIG. 5 (B) is a front view, FIG. 5C is a side view. In the case of FIG. 2, steel tight frames 24A and 24B are provided at the upper and lower portions of the roof 20, and the distance L1 from the end surface of the roof 20 to the roof blocking sheet 10 is about 500 mm or more. It is the same. The roof blocking sheet 10A1 and the roof blocking sheet 10A2 are examples in which the separation distance L3 between the sheets is set to zero. The distance L2 between the roof blocking sheets 10A1 and 10A2 and the roof blocking sheets 10B and 10C is set to about 0 to 500 mm, and the distance L3 between the roof blocking sheet 10B and the roof blocking sheet 10C is set to about 0 to 500 mm. . These separation distances L1 to L3 take into consideration the convenience of construction of the roof shielding sheet and the heat shielding effect of the roof shielding sheet. It is effective to cover 70 to 90% of the roof area with the roof blocking sheets 10A1, 10A2 to 10C.

  Even when a plurality of roof blocking sheets are laid or stretched as shown in FIG. 5, the fasteners 22 are interposed at the top of the folded plate 21 and fixed with bolts and nuts (or screws) 23. At this time, similarly, in the case of a closed-type folded plate, the eyelet 12 is used, but in the case of a stacked-type folded plate, a roof blocking sheet without the eyelet 12 is used, and the end portion is folded and an angle member or the like is used. Fix using a fixing member.

  It should be noted that the closed plate may also be fixed using a fixing member such as an angle member by folding the end portion without using the eyelet. The details will be described next.

  6A and 6B, a trapezoidal square pyramid shaped fastener 221 is fixed to the top of the screw-clamping folded plate 21A, and the rounded round head bolt 222 is attached to the hole in the top of the fastener 221 and the eyelet 12 of the roof blocking sheet 10. In this example, both ends of the bolt 222 are fastened and fixed with nuts 223A and 223B, and the roof blocking sheet 10 is attached to the roof 20. A groove 224 is provided at the bottom of the fastener 221, and the groove 224 is fitted with a rail-shaped protrusion 211 existing on the top of the fastening plate 21 </ b> A, and the groove 224, the protrusion 211, Thus, the fastener 221 is fixed to the clamped folded plate 21A. By using the clasp 221 having a height, a space (height of about 50 to 90 mm) is formed between the roof blocking sheet 10 and the fastening plate 21A.

  FIG. 7 also shows an example of a structure in which the roof blocking sheet 10 is similarly attached to the top of the fastening plate 21A, and a groove 226 provided at the bottom of the trapezoidal square pyramid shaped fastener 225. Is fitted with a rail-shaped protrusion 211 present on the top of the clamped folded plate 21, and the fastener 225 is fixed to the clamped folded plate 21A. A tightening hexagon bolt 227 is suspended below the clasp 225. By tightening the hexagon bolt 227 from both sides, the clasp 225 can be more firmly fixed to the clamped folded plate 21A. Then, the square-headed round head bolt 222 is passed through the hole at the top of the fastener 221 and the eyelet 12 of the roof blocking sheet 10, and both ends of the bolt 222 are fastened with nuts 223A and 223B to fix the roof blocking sheet 10. Attached to the fastening plate 21A. By using the clasp 225 having a height, a space (50 to 90 mm) for generating an air current is formed between the roof blocking sheet 10 and the fastening plate 21A.

  Next, an example in which the roof blocking sheet 10 is mounted on the overlapping folded plate 21B will be described with reference to FIGS. Since there is no protrusion 211 in the clamped folded plate 21A at the top of the stacked folded plate 21B, the construction method is different from that of the clamped folded plate 21A.

  FIG. 8 is an example in which the roof blocking sheet 10 is attached to the X part (midway part) of FIG. 2. First, a rectangular parallelepiped shaped fastening member 230 is attached to the top of the stacked folded plate 21 B with bolts and nuts 231. Fix it. Then, the roof blocking sheet 10 is laid on the upper surface of the fastener 230, and the roof blocking sheet 10 is fastened with screws 232. By sequentially performing this at a predetermined pitch, the roof blocking sheet 10 is mounted on the stacked folded plate 21B. Also in this case, since the clasp 230 with a height is used, the space (50-90 mm) which produces an airflow between the blocking sheet 10 for roofs and the laminated folding plate 21B is formed.

  9 and 10 show an example in which the roof blocking sheet 10 is attached to the Y portion (end portion) of FIG. 2. First, a pipe-shaped fastener 233 having a rectangular cross section is attached to the top of the overlapped folded plate 21B. Secure with nut 234. The reason why the one end of the fastener 233 is open and inclined is to make it easy to tighten the bolt / nut 234 from above with a tool, and may be inclined at both ends or may be flat at both ends. .

  After the fastener 233 is fixed to the top of the stacked folded plate 21B, a rectangular parallelepiped pipe-like fastener 235 and a pipe-like square member 236 are further placed in contact therewith, and the fastener 235 and the square member 236 are bolts and nuts. The roof blocking sheet 10 is placed on the fasteners 235 and the square members 236. Then, an angle member 237 having an L-shaped cross section that engages with the square member 236 is brought into contact, and the roof blocking sheet 10 is sandwiched between the square member 236 and the angle member 237 and fixed with screws 238.

  Note that the clasp 233 does not necessarily have to be a pipe shape, as long as the blocking sheet can be fixed.

  As described above, when the roof blocking sheet 10 according to the present invention is attached to a folded plate and laid or stretched on the roof, as shown in the schematic view of FIG. While being reflected by the surface, airflow (wind) is generated by the space formed between the transmission hole 11, the roof blocking sheet 10 and the folded plate, and ventilation is achieved. Therefore, the heat shielding effect by the roof shielding sheet 10 is very large.

  That is, since the thickness of the roof blocking sheet 10 is as thin as 0.2 to 2.0 mm, the amount of heat stored in the sheet itself can be suppressed, and the roof blocking sheet 10 is separated from the roof surface by about 50 to 90 mm and is fastened. Therefore, the amount of heat propagation to the roof is suppressed. Furthermore, the air-blocking sheet for the roof, the roof and the like are cooled by heat dissipation, and the temperature rise is suppressed.

  FIG. 12A shows a conventional roof in which the roof blocking sheet is not laid or stretched, and heat from the sun is conducted into the room to raise the room temperature. On the other hand, when the roof blocking sheet 10 is laid or stretched on the roof as shown in FIG. 12B, the heat from the sun is reflected by the roof blocking sheet 10 and the heat entering the room is reduced. An increase in temperature can be suppressed or prevented.

  The black roof, silver roof, and white roof were measured using a lamp with a heat source temperature of about 75 ° C., about 30 cm away from the lamp, and the temperature rise was measured 5 minutes after the lighting. As a result, the following differences were found. The black roof was 62.9 ° C., the silver roof was 40.9 ° C. without the shielding sheet, the silver roof was 33.5 ° C. with the shielding sheet, and the white roof was 41.8 ° C.

FIG. 13 is experimental data showing the temperature suppression effect of the present invention. For a 20 m ² prefabricated building with a folded plate roof shape, the outside temperature, the temperature on the folded plate with a roof blocking sheet, and the roof without a blocking sheet The temperature on the folded plate at the top, the ceiling back temperature with the roof blocking sheet, and the ceiling back temperature without the roof blocking sheet were measured over time. As a result, the outside air temperature was almost the same before construction of the roof shielding sheet (without the roof shielding sheet), but the ceiling temperature reached 57.7 ° C, and the temperature on the folded plate rose to 64 ° C. On the other hand, it was confirmed that after the roof blocking sheet was constructed (with the roof blocking sheet), the maximum was 43 ° C on the back of the ceiling and 48.6 ° C on the folded plate. The maximum difference was 14.7 ° C on the back of the ceiling and 15.8 ° C on the folded plate, and the average temperature decreased by 11.5 ° C or more.

  From the experimental data shown in FIG. 13, it is clear that the temperature drops by 5 to 15 ° C. behind the ceiling and power saving is about 15% or more when converted into the amount of electricity used, and the effect of the present invention is remarkable.

  Moreover, when the room temperature improvement effect simulation is performed by the residential thermal load calculation program “SMASH” that has been approved by the national government in the housing performance display system, a roof blocking sheet is laid or installed in the indoor environment shown in FIG. The ceiling back temperature and the room temperature in the case of the above are the characteristics shown in FIG. 15, and the ceiling back temperature and the room temperature in the case where there is no roof blocking sheet are the characteristics shown in FIG.

The space configuration used in this experiment is a living room portion of 3.6 m × 1.8 m × 2.0 m, a ceiling back of 3.6 m × 1.8 m × 0.2 m, and a floor area of 6.48 m ^2. It is. And the natural ventilation frequency | count shall be 1.0 times / h and the solar radiation absorption rate of a roof member is set to 0 when the interruption | blocking sheet | seat for roofs exists. From this, it can be seen that the effect of the present invention is great.

  Further, according to the roof sheet or roof of the present invention, even if it rains, all of the rain does not hit the roof surface and is mitigated by the roof sheet, so that indoor noise is reduced. For this reason, the effect is great especially in a place where there is a lot of rainfall.

  In the above description, the roof blocking sheet itself is directly laid or stretched on the roof. However, as shown in FIG. 17, the blocking sheet 42 described above is formed on a rectangular frame 41 made of wood, synthetic resin, or metal. It is also possible to form a relatively small shielding sheet body 40 having a structure in which the shielding sheet 40 is stretched, and to arrange and secure the shielding sheet body 40 on the roof 43 as shown in FIG. In FIG. 18, six blocking sheet bodies 40 are arranged on the roof 43, but the number is arbitrary, but 70 to 90% of the roof area is covered with the blocking sheet 42 and the frame body 41. . Further, the opening ratio of the transmission holes 43 to the sheet 42 is also about 3 to 8%.

  The vertical position of the blocking sheet 42 with respect to the frame body 41 is arbitrary. That is, the blocking sheet body 40 may be stretched on the upper surface of the frame body 41, may be stretched on the lower surface of the frame body 41, or may be stretched in the middle as shown in FIG.

  FIG. 19 shows another blocking sheet body 50. A plurality of strip-shaped blocking sheets 52 are stretched on a rectangular frame 51, and a slit 53 of about 5 to 20 mm is transmitted between adjacent blocking sheets 52. FIG. It is provided as a hole. In this case, the opening ratio of the slit 53 is about 5 to 15% with respect to the blocking sheet 52, and 70 to 90% of the roof area is covered with the blocking sheet 52 and the frame body 51.

  In the above, a metal roof is taken as an example of the roof, and the case where a roof blocking sheet is laid or stretched on a hull-type folded plate and a stacked folded plate is described, but the roof is not limited to these roofs. Instead, the roof blocking sheet may be laid or stretched by forming an appropriate space between the roof and the roof blocking sheet. The effect is particularly great for metal roofs, but is not limited to metal roofs.

  The above description shows one embodiment of the present invention, and mere design changes and modifications by conventional means that achieve the same operational effects are included in the embodiments of the present invention.

It is a top view which shows an example of the blocking sheet for roofs concerning this invention. It is a figure which shows the structural example which laid or stretched | interrupted the roof blocking sheet (one sheet) on the roof. FIG. 3 is a detailed view of FIG. FIG. 3 is a detailed view of FIG. It is a figure which shows the structural example which laid or stretched | interrupted the roof blocking sheet (three sheets) on the roof. It is a structural diagram which shows an example of the attachment of the blocking sheet for roofs to a helical fastening plate. It is a structural diagram which shows the other example of the attachment of the blocking sheet for roofs to a hose type folding plate. It is a structural diagram which shows an example of the attachment of the interruption | blocking sheet | seat for roofs to a laminated folding board. It is a structural diagram which shows an example of the attachment of the interruption | blocking sheet | seat for roofs to a laminated folding board. It is a structural diagram which shows an example of the attachment of the interruption | blocking sheet | seat for roofs to a laminated folding board. It is a schematic diagram which shows the effect | action (flow of a heat | fever and a wind) of the roof of this invention. It is a schematic diagram which shows the effect | action (heat insulation) of the roof of this invention compared with the former. It is a characteristic view which shows the effect of this invention. It is a figure which shows the example of data which performed the measurement for confirming the effect (heat insulation) of this invention. It is a figure which shows the temperature characteristic example of the conventional roof. It is a figure which shows the temperature characteristic example of the roof of this invention. It is a perspective view which shows the other example of the interruption | blocking sheet | seat (frame structure) for the roof of this invention. It is a figure which shows the example which has arrange | positioned the interruption | blocking sheet | seat for roofs of FIG. 17 on the roof. It is a top view which shows the further another example of the interruption | blocking sheet | seat (frame structure) for the roof of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 House 2 Metal roof 3 Folding board 10 Roof working apparatus 11, 12 Sled member 13A-13D Support member 14A-14C Board | plate material 15 Rope 20-25 Folding board 30 Metal roof 31 Folding board

Claims (2)

A plurality of transmission holes having a diameter of 80 to 150 mm are arranged in a rectangular sheet of polyethylene resin having heat shielding characteristics and rain and light shielding characteristics, and the aperture ratio of the entire transmission holes is smaller than that of the rectangular sheet material. 3-8%, the thickness of the rectangular sheet material is 0.2-2.0 mm, and the end is reinforced with a rope made of polyethylene resin having a diameter of 2.0-6.0 mm Insulation sheet for roof characterized by being made. The roof blocking sheet according to claim 1, wherein eyelets are further provided at the end portions.