DK3184711T3 - STONE WOOL INSULATION PANELS, INSULATION SYSTEM AND INSTALLATION METHOD - Google Patents

Description

Description [0001] The invention relates to insulating panels made from mineral wool, and in particular rockwool. Such insulating panels may be used on the underside of a roof. According to an earlier technique, a first layer of insulating panels is arranged between rafters of the frame and a second layer of insulating panels is arranged below the rafters and the first layer of insulating panels.

[0002] In such an application, the insulating panels make it possible to provide the thermal and acoustic insulation for the use of attics. The use of mineral fiber panels, in particular rockwool, makes it possible to give buildings good fire resistance. Document EP 0,683,288 Al discloses the features of the preamble of claim 1. A need has been felt to make the installation of the insulation easier and faster. The invention improves this situation.

It more particularly aims to provide an insulating panel that is quicker to install.

[0003] To that end, the invention proposes an insulating panel having the features of claim 1 and having an upper face and a lower face. The lower face is parallel and opposite to the upper face. The panel has a first longitudinal side and a second longitudinal side, parallel and opposite to the first longitudinal side. The panel comprises a rockwool body with a substantially homogeneous density. At least one profiled groove is made in said insulating panel from the upper face and from the first longitudinal side. Said groove has a rectangular section with a first surface parallel to the upper face and closer to the upper face than to the lower face and a second surface parallel to the first longitudinal side. The first longitudinal side is flat between the groove and the lower face. The second longitudinal side is flat and extends continuously between the upper face and the lower face. The second surface of the groove extends continuously from the upper face.

Thus, a rafter can be housed in the groove while the second longitudinal side of the panel bears against another rafter. The slot performs a localized separating function of two parts of the insulating panel in the direction of the thickness, the part located between the two rafters on the one hand, and the part located below the rafters on the other hand. The region of the first adjacent part of the slot in the transverse direction can be slightly deformed, resiliently and optionally plastically during the insertion between the two rafters. This provides good airtightness between each rafter and the insulating panel in question. The deformation also favors the temporary holding of the panel before it is permanently fastened. An operator can hold the panel in one hand while using the other hand to fasten it. Thus, a single panel performs the insulating function between the rafters and the insulating function below the rafters. The installation time is greatly decreased. A single operator can place the insulating panel. The panel has a sufficient mechanical strength to allow reversible deformations under the application of pressure on the second surface of the groove, resulting from placement by hand. The holding of the panel between two rafters is made easier. According to claim 1, at least one profiled slot is made in said insulating panel from the second surface of the groove. Said slot has a depth greater than its width. Said slot has a first edge and a second edge parallel and opposite to the first edge. The first edge is closer to the lower face and the second edge closer to the upper face. The first edge is coplanar with the first surface of the groove. The second surface of the groove extends continuously between the upper face and said slot. The capability for lateral resilient deformation is increased.

[0004] In one embodiment, the second surface of the groove is flat and extends continuously between the upper face and the first surface of the groove.

The groove is strictly rectangular. Manufacturing is simplified.

[0005] In one embodiment, the body has a substantially homogeneous density.

[0006] In one embodiment, the distance between the second surface and the first longitudinal side is less than the distance between the upper face and the first surface. The proper holding of the panel is favored.

[0007] In one embodiment, the density of the panel is between 20 and 80 kg/m3, preferably between 45 and 60 kg/m3, for example between 50 and 55 kg/m3. It may then have a specific shape and be placed easily by an operator.

[0008] In one embodiment, the distance between the upper face and the lower face is between 100 and 600 mm, preferably between 150 and 300 mm. Quality insulation is provided while benefiting from quick installation.

[0009] In one embodiment, the distance between the first longitudinal side and the second longitudinal side is between 400 and 800 mm, preferably between 500 and 700 mm. Panels of significant length may thus be placed quickly.

[0010] In one embodiment, the distance between the upper face and the first surface of the groove is between 40 and 200 mm, preferably between 50 and 80 mm. The temporary holding of the panels by gripping between two rafters is satisfactory.

[0011] In one embodiment, the distance between the first longitudinal side and the second surface of the groove is between 20 and 120 mm, preferably between 35 and 60 mm. One thus prevents the layer of the panel located below the groove, in the installed position, from deforming excessively downward.

[0012] In one embodiment, the depth of the slot, considered between the second surface of the groove and the blind end of the slot, is between 8 and 40 mm, preferably between 10 and 20 mm. A sufficient flexibility is imparted in the region located above the slot, in the installed position of the panel, to accommodate distance variations between two rafters.

[0013] The panel may comprise a vapor barrier on one of the two faces.

[0014] The invention also proposes an insulation system comprising at least one hanger positioned between two panels.

[0015] The hanger is in contact with the first longitudinal side of said panel and with the second longitudinal side of an adjacent panel. The hanger comprises a first flat end flush with the groove and making it possible to fasten the hanger to a rafter, a second end opposite to the first projecting with respect to the lower face of said panel and equipped with a support member intended to support a plasterboard rail, and bendable tabs, one for contact with the lower face of said panel, the other for contact with the lower face of the adjacent panel, the hanger being in one piece. Thus, the operator holding a panel in one hand between two rafters can have one hand free to bend the tabs, which provide stable maintenance of the panel. Thus, all of the panels for a roof can be installed. Then the operator installs the rails and continues the work. The installation is very fast.

[0016] The invention also proposes a method for installing roof insulation, in which: a first hanger is attached to a first rafter and a second hanger is attached to a second rafter adjacent to the first, an insulating panel as described above is brought into position with the second surface of said groove in contact with the edge of the first rafter and the second longitudinal side in contact with the edge of the second rafter, the first surface of said groove in contact with the first rafter, the first and second rafters applying a nonzero compression force between the second surface of said groove and the second longitudinal side, a tab of the first hanger and a tab of the second hanger are bent against the lower face of the panel, each at one lateral end of said lower face, a tab of the first hanger and a tab of the second hanger remaining available for respective adjacent panels.

[0017] Such a method is particularly cost-effective while being appreciated by installation operators.

[0018] "Profiled" here refers to the property according to which a panel has a constant cross-section over its length. The description of a cross-section taken in any location of the length is then sufficient.

[0019] Other features and advantages of the invention will appear upon reading the following description, and the appended drawings, in which: figure 1 is a cross-sectional view of an insulating panel according to one aspect of the invention; figure 2 is a view of the panel of figure 1 installed between two rafters; figure 3 is a perspective view of a hanger in the initial state; figure 4 is a perspective view of an installed hanger; figure 5 is a cross-sectional view of an insulation system according to one aspect of the invention; figures 6 and 7 are perspective views of a hanger in the initial state and the installed state; and figure 8 is a cross-sectional view of an insulation system according to one aspect of the invention.

[0020] The recent increase in the thicknesses of insulation installed on an incline on roofs is creating new difficulties. When the thickness of the insulating panel was smaller than the height of the rafter, the insulating panel was housed between two rafters. A plasterboard panel could be fastened directly to the rafters or fastened via a rail or furring. The installation of insulating panels with thickness exceeding 100 mm led to the technique of installing two panels, one arranged between the rafters and the other below the rafters. This installation technique is slow and expensive.

[0021] Here, a rafter refers to the piece of frame that supports the batten or the laths on which the tiles or slates rest. The rafters are arranged in the direction of the slope of the roof. The rafters generally rest on horizontal pieces of frame called purlins. The roof insulation makes it possible to take advantage of the space in attics as livable space.

[0022] The applicant has developed a panel providing high quality insulation according to the current standards and quick and easy installation.

[0023] The insulating panel 1 essentially comprises a mineral wool body, preferably made from rockwool. The body is in a single piece. The body has a homogeneous density. A vapor barrier can be added to it.

[0024] As illustrated in figure 1, the insulating panel 1 comprises an upper face 2 and a lower face 3 that are parallel. The lower face 3 is opposite to the upper face 2. The upper 2 and lower 3 faces form the main surfaces of the insulating panel 1. The insulating panel comprises a first longitudinal side 4 and a second longitudinal side 5 that are parallel. The second longitudinal side 5 is opposite to the first longitudinal side 4. The longitudinal sides 4 and 5 extend over the length and over the thickness of the insulating panel 1. The upper 2 and lower 3 faces extend over the length and the width of the insulating panel 1. The insulating panel 1 is profiled.

[0025] The insulating panel 1 can be made according to a continuous in-line manufacturing technique.

[0026] A groove 6 and a slot 7 are made in the insulating panel 1. The groove 6 is longitudinal, thus retaining the profiled nature of the insulating panel 1. The groove 6 has a rectangular section. The groove 6 is made from the upper face 2 and from the first longitudinal side 4 of the insulating panel 1. In other words, the groove 6 is made from a corner of the insulating panel 1. The groove 6 has a first surface 8 parallel to the upper face 2. The groove 6 has a second surface 9 parallel to the first longitudinal side 4.

In the illustrated embodiment, the dimension of the second surface 9 in the direction of the thickness of the insulating panel 1 is larger than the dimension of the first surface 8 in the direction of the width. In other words, the groove 6 has a depth larger than its width. [0027] The slot 7 is made in the insulating panel 1 from the groove 6. More specifically, the groove 7 is arranged in the insulating panel 1 from the second surface 9 of the groove 6. The slot 7 has a first edge 10 and a second edge 11. The edges 10 and 11 of the slot 7 are parallel. A blind end 12 can be perpendicular to the first and second edges 10 and 11. The slot 7 is made by removing material, for example by milling. Alternatively, the blind end is narrow, the slot 7 being cut by a solid blade, for example a knife. The slot 7 is profiled, thus retaining the profiled nature of the insulating panel 1. The first edge 10 of the slot 7 is coplanar with the first surface 8 of the slot 6. The second edge 11 of the slot 7 is arranged between the first surface 8 of the slot 6 and the upper face 2. In other words, the first edge 10 is located on the side of the lower face 3, while the second edge 11 is located on the side of the lower face 3. The slot 7 has a depth greater than its width. In other words, the dimension of the blind end 12 considered in the direction of the thickness of the insulating panel 1 is smaller than the dimension of the first and second edges 10 and 11 considered in the direction of the width of the insulating panel 1.

[0028] The first surface 8 is continuous. The second surface 9 is continuous. The second side 5 of the insulating panel is continuous. Continuous refers to a surface obtained by cutting a rockwool pad using a flat tool. Thus, the first surface 8 of the groove 6 is flat. The second surface 9 is flat. The second side 5 of the insulating panel is flat.

[0029] In another embodiment, the insulating panel 1 has no slot. The groove 6 is rectangular strictly speaking. The first surface 8 and the second surface 9 come together at a right angle. The second surface 9 extends continuously between the upper face 2 and the first surface 8.

[0030] The insulating panel 1 offers a sufficient mechanical strength to be inserted between two rafters 20 and 21, see figure 2. The compression is reflected by reversible deformations in the elastic domain. A slight pressure can be applied by the inner faces of two adjacent rafters while deforming the insulating panel 1 resiliently. A plastic deformation is avoided.

[0031] More specifically, each rafter 20, 21 has a rectangular section. Each rafter has a lower face 20a, 21a, an upper face 20b, 21b supporting the laths, not shown, a lateral face 20c, 21c and an opposite lateral face 20d, 21d. The lateral face 20d of the rafter 20 faces the lateral face 21c of the rafter 21. The lateral face 20d is in contact with the second surface 9 of the groove 6. The lateral face 21c of the rafter 21 is in contact with the second longitudinal side 5 of the insulating panel 1. The lower face 20a of the rafter 20 is in contact with the first surface 8 of the groove 6.

[0032] The slot 7 appears to be smaller in the direction of the width of the insulating panel 1 in figure 2 compared with figure 1. This is due to the deformation of the insulating panel 1 by compression between the two rafters 20 and 21. More specifically, the region of the insulating panel 1 comprised between the plane of the upper face 2 and the plane of the second edge 11 of the slot 7 on the one hand, and comprised, along a perpendicular plane, between the plane of the second surface 9 of the slot 6 and a plane parallel to the previous one and passing through the blind end of the slot 7 is resiliently compressed. The slot 7 thus makes it possible to favor the deformation of said region while preventing said deformation from extending to other parts of the insulating panel 1, for example to a region comprising the first surface 8 of the groove 6 or the first longitudinal side 4 of the insulating panel 1. Regular contact between the first surface 8 of the groove 6 and the lower surface 20a of the rafter 20 participates in quality insulation.

[0033] The first longitudinal side 4 of the insulating panel 1 and the lateral face 20c of the rafter 20 are coplanar. The second longitudinal side 5 is coplanar with the surface 21c of the rafter 21.

[0034] The upper face 2 of the insulating panel 1 is offset relative to the upper surfaces 20b and 21b of the rafters 20 and 21, allowing a space to remain. Such a space is desired to allow good ventilation of the roof. In the event such a space is not useful, the upper face 2 of the insulating panel 1 can be coplanar with the upper faces 20b and 21b of the rafters 20 and 21.

[0035] In one embodiment, the depth of the groove 6 in the direction of the thickness of the insulating panel 1 is between 20 and 50% of the thickness of the insulating panel 1. The width of the groove 6 in the direction of the width of the insulating panel 1 can be between 5 and 10% of the width of said insulating panels 1.

[0036] The groove 6 has a depth greater than its width. In one application, the thickness of the insulating panel 1 is between 100 and 600 mm, preferably between 150 and 300 mm, for example equal to 205 mm. The width of the insulating panel 1 is between 400 and 800 mm, preferably between 500 and 700 mm, for example equal to 600 mm. The width of the insulating panel 1 is equal to the distance between two rafters increased by the width of one rafter. The width of the groove 6 can be between 20 and 120 mm, preferably between 35 and 60 mm, for example equal to 50 mm. The width of 50 mm is in particular appropriate for a rafter 60 mm wide. It is thus possible to provide a groove 6 width that is 5 to 15 mm smaller than the width of the corresponding rafter.

[0037] The depth of the groove 6 in the direction of the thickness of the insulating panel 1 can be between 40 and 200 mm, preferably between 50 and 90 mm, for example equal to 60 mm. The depth of 60 mm is appropriate for a rafter 80 mm high while leaving a space of 20 mm high above the upper face 2 between the lateral faces 20d and 21c of the rafters 20 and 21.

[0038] The first surface 8 of the groove 6 is in contact with the lower face 20a of the rafter 20 with a low contact pressure.

[0039] It is possible to provide nominal dimensions equal to the height of the rafter considered in the direction of the thickness of the insulating panel 1 and the sum of the depth of the groove and any space between the rafters above the upper face 2 of the insulating panel 1. The contact is provided between the first surface 8 of the groove 6 and the lower face 20a of the rafter 20 while avoiding a deformation. It is thus possible to keep good flatness of the first longitudinal side 4 of the insulating panel 1 for the contact with the second longitudinal side of an adjacent panel, visible in figure 5. The second longitudinal side 5 of a second panel comes into contact with the side face 20c of the rafter 20 and the first longitudinal side 4 of the insulating panel 1.

[0040] In the state shown in figure 2, the insulating panel 1 is kept between the rafters 20 and 21 due to the resiliency in the direction of the width offered by the deformable region of said insulating panel 1 located between the slot 7 and the upper face 2, near the second surface 9 of the slot 6. Furthermore, the slot 7, by increasing the deformation capability of said deformable region, makes it possible to reduce any deformation of the part of the second longitudinal side 5 in contact with the lateral face 21c of the rafter 21. Indeed, a deformation of the second longitudinal side 5 is preferably to be avoided in order to offer a flat surface for the contact with the first longitudinal side 4 of an adjacent panel whose roof 6 surrounds the rafter 21. In the mode with no slot, the deformation is local.

[0041] In figures 3 and 4, a hanger 30 is shown respectively in the state in which said hanger 30 is fastened to a rafter and allows the insertion of an insulating panel 1 and in the state in which said hanger 30 participates in holding two insulating panels in place located each on one side. The hanger 30 essentially assumes the form of a thin tongue. The hanger 30 can be made from metal, for example galvanized steel. The hanger 30 is in one piece. The hanger 30 can have a thickness of between 0.4 and 10 mm, preferably between 0.5 and 0.8 mm. The hanger 30 has a generally rectangular body 31 with holes 32 allowing the passage of fastening screws on a rafter. The holes 32 are arranged at a first end of the body 31. At the opposite end of the body 31 in the direction of the length of said body, the hanger 30 is provided with a support member 33 for a rail or furring in the form of two projections extending laterally.

[0042] The hanger 30 also comprises two tabs offset relative to the attachment member 33 toward the other end. The tabs 34 and 35 are obtained by partial cutting from the body 31. The tabs 34 and 35 are attached to the body 31 by a continuous portion over a small length, for example around a centimeter, and are separated from the body 31 by a cutout on the side of the end provided with holes 32. The length of the tabs 34 and 35 may be about 40 to 70% of the total length of the hanger 30. The width of the tabs 34 and 35 is significantly smaller than the width of the body 31, such that the bending operation causes the bending of the tabs 34 and 35 while retaining the flat shape of the body 31. [0043] Due to the material of the hanger 30, the tabs 34 and 35 can be bent substantially at a right angle so as to support the lower faces 3 of two adjacent panels. The hanger 30, which is provided to be arranged between two adjacent panels, has a small thickness. Figure 5 illustrates an insulating system in place installed on an incline below a roof. Only the rafters 20 and 21 of the framework have been shown in order to simplify the drawing. A hanger 30 is fastened to the rafter 21, for example, by screwing. The majority of the body 31 of the hanger 30 is arranged between the first longitudinal side 4 of a first insulating panel and the second longitudinal side 5 of a second insulating panel, said longitudinal sides being in contact with one another over their length with the exception of the location where the hanger 30 is arranged.

[0044] The tabs 34 and 35 have been bent at a right angle. The tabs 34 and 35 participate in holding the insulating panels in place. A furring or rail 36 is attached to the attachment member 33 of the hanger 30. A space can be left between the rail and the lower face 3. The furrings or rails are arranged horizontally at regular intervals. Below the rail 36, a plasterboard 37 is fastened, for example using screws.

[0045] The insulating system thus formed offers excellent thermal properties. The lower face of the rafters is covered by a significant insulating thickness. The rafters themselves participate in the insulation due to their inherent properties.

[0046] The installation of the insulating system can be done as follows. An operator first places hangers 30 on a side face 20c, 21c of the rafters using a gauge or preset reference marks, the hangers being in the state illustrated in figure 3. The tabs 34 and 35 are coplanar with respect to the body 31 of the hanger 30. The tabs 34 and 35 leave the passage free to install the insulating panels 1. Then, the operator inserts the insulating panels 1 between the rafters. Each rafter is thus arranged in a groove 6 of an insulating panel 1. The hangers 30 provide a guide for the insertion of the insulating panels 1. The insertion of the panel 1 between the adjacent rafters 20 and 21 may require slight force. In this step, the force may be provided by both hands of the operator, who, once this operation is performed, has one hand freed by the holding provided by the gripping between the rafters.

[0047] Then, once the panel 1 is inserted, the operator holds said panel 1 with one hand while benefiting from the holding provided by the resiliency of the deformable zone of the insulating panel 1 in contact with the second surface 9 of the groove 6. With the other hand, the operator bends a tab 34 at a right angle on one side of the insulating panel 1 and a tab 35 on the other side of the insulating panel 1, thus providing holding at both lateral ends of the lower face 3 of an insulating panel 1. Of course, what has been described in cross-section illustrated in figure 5 is reproduced at regular intervals in the direction of the length of the insulating panels 1 and the rafters to provide sufficient holding. An insulating panel can be held by about 4, 6 or 8 tabs.

[0048] The adjacent panel can be inserted in the same way while taking advantage of the lack of unevenness offered by the hanger 6 before the bending of the tab intended for said corresponding insulating panel. Once the insulating panels are placed, the operator installs and attaches the furrings or rails 36. The operator lastly installs the plasterboards 37. To install the insulating panels, the operator can work alone.

[0049] In figures 6 to 8, a second embodiment of a hanger is shown. A hanger 30 is respectively shown in the state in which said hanger 30 is fastened to a rafter and allows the insertion of an insulating panel 1 and in the state in which said hanger 30 participates in holding two insulating panels in place each located on one side. The hanger 30 is essentially in the form of a thin tongue. The hanger 30 can be made from metal, for example galvanized steel. The hanger 30 is in one piece. The hanger 30 may have a thickness between 0.4 and 1 mm, preferably between 0.5 and 0.8 mm. The hanger 30 has a body 31 provided with holes 32 allowing the passage of fastening screws on a rafter. The holes 32 are arranged at a first end of the body 31. At the opposite end of the body 31 in the direction of the length of said body, the hanger 30 is provided with a support member 33 for a rail or furring in the form of two projections extending laterally. The body 31 is generally in the form of a Latin cross with two lateral extensions 39 and 40. The lateral extensions 39 and 40 are square.

[0050] The hanger 30 also comprises two tabs 34 and 35 that are offset relative to the attachment member 33 toward the other end. The tabs 34 and 35 originate from the lateral extensions 39 and 40. The tabs 34 and 35 are obtained by partial cutting from the body 31. The tabs 34 and 35 are attached to the body 31 by a continuous portion over a short length, for example of about a centimeter, and are separated from the body 31 by a cutout on the side of the end provided with the holes 32. The length of the tabs 34 and 35 can be about 30 to 70% of the total length of the hanger 30. The width of the tabs 34 and 35 is significantly smaller than the width of the body 31, such that the bending operation causes the bending of the tabs 34 and 35 while preserving the flat shape of the body 31 and the lateral extensions 39 and 40. The tabs 34 and 35 are bent in the same direction, cf. figure 7. The tabs 34 and 35 are bent substantially at a right angle.

[0051] On the side of the lateral extensions 39 and 40 opposite to the tabs 34 and 35, the hanger 30 comprises a loop 38 surrounding the support member 33. The loop 38 matches the shape of the body 31 between the lateral extensions 39 and 40 and the support member 33 and with the support member 33. The loop 38 is U-shaped. The loop 38 has outer edges aligned with the outer edges of the tabs 34 and 35. The loop 38 is formed by cutting out a sheet metal blank. The loop 38 is bent in the direction opposite the tabs 34 and 35, cf. figure 7. The loop 38 is bent substantially at a right angle. The loop 38 forms a bendable holding tab for a panel.

[0052] Due to the height of the lateral extensions 39 and 40, the loop 38 and the tabs 34 and 35 are offset in terms of height. In other words, the loop 38 and the tabs 34 and 35 are offset in the direction of the thickness of the insulating panel 1, cf. figure 8. The offset is negligible.

Claims (11)

An insulation panel (1) consisting of an upper surface (2) and a lower surface (3) parallel and opposite to the upper surface, a first longitudinal side (4) and a second longitudinal side (5), parallel and opposite to the first longitudinal surface. page (4), wherein said panel comprises a base piece made of stone wool; at least one profiled groove (6) is made in said insulation panel (1) from the upper surface (2) and from the first longitudinal side (4), said groove (6) having a square section with a first surface (8) in parallel with the upper surface (2) and closer to the upper surface than on the lower surface and a second surface (9) parallel to the first longitudinal side (4), the first longitudinal side (4) being flat between the groove (6) and the lower surface (3), the second longitudinal side (5) is flat and extends continuously between the upper surface (2) and the lower surface (3), the second surface (9) of the groove (6) is flat and extending continuously from the upper surface (2), characterized in that it comprises at least one profiled opening (7) formed in said insulation panel (1) from the second surface (9) of the groove (6), wherein said opening (7) has a depth greater than its width, said opening (7) having a first edge (10) and a second edge (11) parallel and opposite to the first edge, the first edge (10) closer to the lower face (3) and the second edge (11) closer to the upper face (2), the first edge (10) being coplanar with the first surface (8) of the roller, the second surface (9) of the groove (6) extends continuously between the upper surface (2) and the opening (7). The panel of claim 1, wherein the second surface (9) of the groove (6) is flat and extends continuously between the upper surface (2) and the first surface (8) of the groove (6). Panel according to one of the preceding claims, wherein the distance between the second surface (9) and the first longitudinal side (4) is less than the distance between the upper surface (2) and the first surface (8). Panel according to any one of the preceding claims, wherein the density of the panel consists of between 20 and 80 kg per square meter. and preferably between 45 and 60 kg per cubic meter. cubic meters. Panel according to any one of the preceding claims, wherein the distance between the upper surface (2) and the lower surface (3) is between 100 and 600 mm, and preferably between 150 and 300 mm, and the distance between the first longitudinal side. (4) and the other longitudinal side (5) are between 400 and 800 mm, and preferably between 500 and 700 mm. Panel according to any one of the preceding claims, wherein the distance between the upper surface (2) and the first surface (8) of the groove is between 40 and 200 mm, and preferably between 50 and 80 mm. Panel according to any one of the preceding claims, wherein the distance between the first longitudinal side (4) and the second surface (9) of the groove is between 20 and 120 mm, and preferably between 35 and 60 mm. The panel of claim 1, wherein the depth of the opening (7) located between the second surface (9) of the groove and the blind end of the opening (7) is between 8 and 40 mm, and most preferably between 10 and 20 mm. An insulation system comprising at least two panels, of which at least one (1) is in accordance with any one of the preceding claims, and at least one suspension part (30) is placed between two panels and in contact with the first longitudinal side of said panel and with the second longitudinal side of an adjacent panel, wherein the hinge portion comprises a flat first end flush with the groove, a second end opposed to the first protruding with respect to the lower surface (3) of said panel and provided with a support member (33), intended to support a plasterboard rail (36) and with flexible tabs (34, 35); one for contact with the lower face (3) of said panel (1) and the other for contact with the lower face of the adjacent panel, the hanging portion being integral. The system of claim 9, wherein the tabs (34, 35) are arranged one on each side of a central portion (31) extending from the first end to the second end. A method of installing roof insulation, in which: (a) a first hanging portion is secured to a first rafter and a second hanging portion is secured to a second rafter adjacent to the first; b) an insulation panel according to any one of claims 1 to 6. is brought into position with the second surface of said groove in contact with the edge of the first groove and the second longitudinal side in contact with the edge of the second groove, the first surface of said groove in contact with the first groove where the first and the second bar applies a non-zero compressive force between the second surface of said groove and the second longitudinal side; (c) a tab of the first hanging portion and a tab of the second hanging portion are bent toward the lower side of the panel, each in one lateral end of said lower surface, wherein a tab of the first hanging portion and a tab of the second hanging portion remain accessible to respective adjacent panels.