EP2381048A1 - Platte, Wärmeisolierung für Dach und Anwendung - Google Patents

Abstract

The panel (1a) has parallelogram shape at non-right angle in a plane, where the panel is made of rigid, sectile and elastic insulating material i.e. expanded polystyrene. Two edges of the parallelogram are entered into contact with adjacent panels and in the V shape that is dissymmetrical. Notches are formed close to edge on small sides of the parallelogram. Studs are arranged on an outer surface of the panel to assure perfect ventilation under lathing. A channel is arranged on a large side of the outer surface of the panel to allow drainage of condensed water.

Description

The present invention relates to roof insulation for buildings.

In the first place, the invention relates to insulation panels for roofing.

A roof is generally made with sloped rafters spaced about 600mm apart, and connecting a low side beam (called a sand pit fault) to a horizontal top beam (called a blackout). Then horizontal slats are fixed on said rafters with a spacing allowing the mounting of tiles.

In order to isolate such a roof from the inside, the space left between the rafters must be filled with insulation, which allows the heat to pass easily. The quality of such insulation will depend on the proper filling of the space, and the maintenance in time of this good filling. If spaces are left empty, where the air can circulate, and so hot air and cold air can mix, this constitutes "thermal bridges", through which the heat will pass preferentially, and the insulation will be globally deteriorated and ineffective. If one succeeds a good insulation between the rafters, it is the chevron itself which ends up allowing more heat to pass than the added insulation, and constitutes itself a thermal bridge. We can then improve the overall insulation by also removing this thermal bridge.

The internal insulations for roofing are made according to the state of the art for example by mineral wool, glass wool or rock wool, enclosed between two rafters.

The main disadvantage of this solution lies in the short duration of the insulation performance. Mineral wools are insulating thanks to air trapped in the fibers. Already at the installation, about 15% of the performance is lost by the pressure exerted for handling and installation. Part of the air escapes immediately. Then, under the effect of moisture and dust, the wool sinks, and more air escapes. A report by the CSTB (Scientific and Technical Center for Building) indicates that 10 years after installation, the insulation performance has fallen to 15% of its original value.

Withdrawals and openings at the joints are impossible to seal. There are therefore thermal bridges that seriously damage the insulation.

In addition the mineral wools are irritating to the skin, which makes the pose unpleasant. In addition, they are classified as carcinogenic in category 3 by CSTB and radioactive.
We can use wood wool, hemp, etc ... non-carcinogenic or radioactive.

They also have all the other disadvantages mentioned above, and in particular the loss of performance over time.

There is a pose alternative which consists of flocking. It involves injecting small particles of cellulose or polyurethane foam into spaces created between the roof, the rafters and panels, for example wood chipboard, fixed under the rafters. This alternative makes it possible in principle to overcome the loss of insulation to the laying observed in the wool panels, but it has the disadvantage that the filling control is difficult to perform, and the installation imperfections are only detectable 'with an infrared camera. In addition, the insulation qualities deteriorate very quickly over time, about twice as fast as with wool panels. As for fibers, the air begins to flow and escape where loss of efficiency over time.

Another solution of the state of the art consists for example of polyurethane panels. These panels are rigid, and therefore not likely to sag in time. But once installed, this type of panel has openings at the joints between two adjacent panels and between a panel and the adjacent chevron, which constitute enormous thermal bridges. To seal these openings is used foam, for example polyurethane also. This leads to extra work, which is often not done correctly, so that there are still some openings at some joints. These constitute thermal bridges through which heat passes, and which seriously deteriorate the overall insulation performance. Another solution sometimes applied is to make two layers of polyurethane panels, the joints of the second layer being offset from those of the first layer. This solution is labor intensive, and does not improve the problem, however, without solving it completely, only for the joints between two adjacent panels, and does nothing to remove the openings between panels and adjacent chevrons. In addition it increases the difficulty of implementation.

The joints of these panels are often "closed" with an adhesive, but it is recognized that no glue for maintaining these materials lasts more than two years due to temperature variations: in winter, it freezes at the roof and in summer, the temperature can exceed 65 ° C under the tiles.

In addition, the gas that gives the polyurethane foam its insulating power, is not trapped in closed cells and escapes over time thus making the material porous and ineffective thermally.
In addition, polyurethane is highly flammable and releases toxic gases in case of fire. Because of this, it is forbidden to use for public buildings.

It is also more expensive than mineral wool and polystyrene.

There is therefore a need to find a solution to significantly reduce thermal bridging, and ensure a durable insulation performance, while using an authorized material for public buildings.

The invention aims to meet these needs, and to solve many of the problems posed by the state of the art.

For this purpose it is proposed a panel for interior insulation of a roof to be inserted between rafters of said roof. This panel is remarkable in that it is made of a rigid insulating material, elastic and breakable and that it has in plan a parallelogram shape with a right angle.

Rigidity allows stability of panel geometry over time, thus maintaining insulation performance for many years. The fact that air, the only natural insulator on earth, is trapped in closed cells, is a guarantee of thermal efficiency over time, the product being classified as rot-proof (according to CE standards). The oblique positioning as well as the spacing of 2 mm of the breakable parts arranged on each side of the panel can compress the panels on the one hand against the rafters of the roof, on the other hand against the adjacent panels, so that the panel by seeking to return to its original shape, which is the characteristic trend of an elastic material, fills the interstices due to imperfections in geometry, in particular rafters of the roof. Finally the parallelogram shape gives greater flexibility to the panel, thus making it possible to catch larger imperfections than could a rectangle (parallelogram at right angles).

According to a particular embodiment of the invention, the two edges of said parallelogram intended to come into contact with adjacent panels are V-shaped. Thus, despite all the pressure exerted by one panel on an adjacent panel, the two panels will remain perfectly flush against each other without any risk of opening of the insulating structure and level thermal bridges such as those encountered with rectangular panels polyurethane.

According to a preferred embodiment of the invention said V-shaped is asymmetrical, the small branch of the V preferably being oriented towards the outer face of said roof. This arrangement allows an easier installation of the panels and a seal tight to temperature and humidity.

According to a particularly preferred embodiment of the invention, several notches are arranged close to the edge of the two small sides of said parallelogram, with a depth greater than half the thickness of said panel, preferably of the order of 80%. the thickness of said panel. It is thus possible, by breaking the edge at the location of one of the notches (scored part) modify the width of said panel to adapt to the actual spacing observed between two rafters of said roof.

According to a preferred embodiment of the invention, the material constituting the panel is expanded polystyrene. This material is classified M1 fire by the CSTB, and has no toxicity or gene for the editor.

According to another preferred embodiment of the invention, pads are arranged on the outer face of said panel. This gives perfect ventilation under the battens.

According to another preferred embodiment of the invention, at least one groove is disposed on one of the long sides of the outer face of said panel, said groove forms a channel. Thus, this arrangement allows the drainage of the condensation water.

According to a particularly preferred embodiment of the invention, the thickness of said panel is greater than that of the rafters of said roof, so that by covering said panels by a non-elastic plaster board type panel, a board air is trapped between the chevron and said non-elastic panel. This provision eliminates the thermal bridge constituted by said rafters.

Finally, the invention relates to an interior roof insulation in which panels according to the invention are placed between the rafters of said roof for example by the interior of the building.

Alternatively to be placed on uneven surfaces, the roof insulation according to the invention is made with panels which have a geometry or a generally rectangular plate shape namely two relatively flat faces and four end edges, two of which large and two small.

These panels are fixed on the rafters of the roof or on the roofing by a counter battens.

Thus, these panels intended to be placed on the rafters or in any case the frame of the roof supporting tiles, are placed on surfaces whose flatness is not certain. As a result, the panels can move relative to the rafters and / or between them.

In addition, some frames are not flat from the beginning and / or for others, the wood plays and the flatness changes and disappears over time.

To solve this problem, it has been realized panels having on the side of the first face, on at least one end edge, a groove facing at least one tab of an end edge of another panel , said tongue coming to marry said groove to stabilize the assembly formed by the assembled panels.

This tongue / groove geometry is the geometry known since prehistory in the form of a dovetail and tenon / mortise fasteners.

Thus, the assembled panels form a whole and are maintained but can separate and develop hollows between the panels.

This specific geometry, if it maintains the stability of the panels attached to each other, does not guarantee insulation or sealing. The moisture comes from the rain if the tiles are defective, but also in much more penetrating form, through the roof, between the tiles, whether it comes from powdery snow or condensation.

Today, a person skilled in the art, in order to guarantee the watertightness, poses materials of the type of a film typically of geotextile material on a double lathing over paneling or plasterboard. (Placo-plaster being a trademark of LAFARGE)

This response to moisture has serious limitations.

Already, we see the need for additional work to pose these materials that add up. In the case of a roofing, it is imperative to put a first against lathing on which is stretched the underlayment film, the latter being fixed by a second against lathing. The film is thus caught between two slats which requires at least five cm in height. The panels can, in addition, play following the lack of flatness; tests and analyzes have shown that thermal bridges are created where the panels rebel. As a result, the insulation is no longer ensured, a single passage allowing the entry of external cold.

To thermally insulate and to ensure a seal, the skilled person is led to ask in addition to polyurethane foam material and adhesive at the joints.

In addition, no adhesive for these materials or adhesive films lasts more than two years due to temperature variations: in winter, it freezes at the roof and in summer, the temperature can exceed 65 ° C under the tiles.

Therefore, after a relatively short time for a building, additional materials laid for insulation and sealing can no longer perform their functions.

The object of the invention is to provide flatness over time and to solve these problems and to eliminate the lower counter-lathing. For this, there is provided an insulating panel for roofing characterized in that said panel has on said end edge on the side of its second face a second tab facing a second groove of the other panel to ensure in time sealing.

In order to isolate already existing buildings, the invention also relates to the use of panels according to the invention for a quick and direct installation between the rafters of a roof.

The present invention also relates to the use of insulating panels in accordance with those described for a quick and direct installation on rafters or voliging to ensure total waterproofness to rainwater and condensation, to powder snow and to dust.

• La figure 1 représente la face extérieure d'un panneau 1 selon l'invention ;
• La figure 2 représente la face intérieure d'un panneau 1 selon l'invention ;
• La figure 3 représente une vue du chant A du grand côté inférieur du panneau de la figure 1 ;
• La figure 4 représente une vue du chant B du grand côté supérieur du panneau de la figure 1 ;
• La figure 5 représente une vue du chant C d'un petit côté du panneau de la figure 1 ;
• La figure 6 représente une vue du chant D d'un petit côté du panneau de la figure 1 ;
• La figure 7 représente une structure de plusieurs panneaux 1, 1a, 1b, selon l'invention montés entre deux chevrons 9, vue de dessous la toiture ;
• La figure 8 représente la structure de la figure 7, vue en coupe.
• La figure 9 représente un type de panneau jointif pour l'isolation de toiture selon l'invention vu de dessus ;
• La figure 10 représente le panneau de la figure 9 vu du côté droit présentant sa première bordure.
• La figure 11 représente le panneau de la figure 9 vu du côté gauche représentant sa deuxième bordure.
• La figure 12 représente le panneau de la figure 9 vu de face présentant sa troisième bordure.
• La figure 13 représente le panneau de la figure 9 vu d'arrière représentant sa quatrième bordure.
• La figure 14 représente, vue de côté en éclaté, la jonction d'une isolation de toiture selon l'invention réalisée au niveau de la petite bordure de panneaux du type de la figure 9.
• La figure 7 représente, vue de côté en éclaté, la jonction d'une isolation de toiture selon l'invention réalisée au niveau de la grande bordure de panneaux du type de la figure 9.

Other advantages of the invention will appear on reading the description of a nonlimiting exemplary embodiment and the appended drawings, in which:

• The figure 1 represents the outer face of a panel 1 according to the invention;
• The figure 2 represents the inside face of a panel 1 according to the invention;
• The figure 3 represents a view of the singing A of the large lower side of the panel of the figure 1 ;
• The figure 4 represents a view of the singing B of the large upper side of the panel of the figure 1 ;
• The figure 5 represents a view of the singing C of a small side of the panel of the figure 1 ;
• The figure 6 represents a view of the singing D of a small side of the panel of the figure 1 ;
• The figure 7 represents a structure of several panels 1, 1a, 1b, according to the invention mounted between two rafters 9, seen from below the roof;
• The figure 8 represents the structure of the figure 7 , sectional view.
• The figure 9 represents a type of joined panel for the roof insulation according to the invention seen from above;
• The figure 10 represents the panel of the figure 9 seen from the right side with its first border.
• The figure 11 represents the panel of the figure 9 seen from the left side representing his second border.
• The figure 12 represents the panel of the figure 9 seen from the front with its third border.
• The figure 13 represents the panel of the figure 9 seen from behind representing its fourth border.
• The figure 14 represents, in exploded side view, the junction of a roof insulation according to the invention made at the level of the small border of panels of the type of the figure 9 .
• The figure 7 represents, in exploded side view, the junction of a roof insulation according to the invention made at the level of the large border of panels of the type of the figure 9 .

The panel 1 for interior insulation of roof represented by the Figures 1 to 4 has two outer and inner faces 2, 3, having a parallelogram shape, the short sides C and D having a length P of about 500 mm, and the long sides A and B having a length G of about 780 mm, for a mounting between two rafters 4 whose spacing E is about 600 mm. The acute angle α of the parallelogram is about 50 °. This panel 1 made of expanded polystyrene material in the embodiment variant shown in the figures has four side edges: the A and B sidewalls on the long sides of the parallelogram and the C and D sides on its short sides. Plots 4 are arranged on the outer face 2. These pads allow ventilation under the lathing 10, and therefore an improved life of the lathing 10 and tiles 11. The outer face 2 still has the side of the edge B of the channels 5. These channels 5 allow the evacuation of the condensation water.

The song A is represented in front view of the figure 3 . The reference signs representing the same elements appearing in several figures are kept identically. This view shows the notches 6 made near the edges C and D. In the variant shown, five notches 6 are arranged, 5 mm wide, and spaced 2 mm, and a depth of 80% compared to the thickness of the panel. They allow at the time of assembly of the panel to adjust the width of the panel to the actual space between two rafters 9, breaking by hand at one of the notches 6. This gives a new song C or D perfectly planar over the entire thickness in contact with the adjacent chevron 9. We see in fact at the figure 8 that the thickness of the panel 1 is greater than that of the chevron 9 so that the "broken" part is not in contact with the chevron 9, thus ensuring a perfectly flat edge on all the part in contact with said chevron 9.

The song B is represented in front view of the figure 4 . This song is similar to the song A, with in addition 5 channels disposed on the outer face, to evacuate the condensation water.

The songs C and D are represented in front view of figures 5 and 6 by the example of the song C, the song D being symmetrical to the song C. There is observed the particular profile of the songs A and B, in the form of asymmetrical V-shape. The small branch 7 of the V is located towards the outer face of the panel, and in the exemplary embodiment shown has a width of 20 mm over a height of 30 mm. The large branch 8 of the V, located towards the inner face of the panel has in the embodiment shown a width of 130 mm, a height also 30 mm. The total thickness of the panel is in this case 150 mm.

The figure 7 presents a mounting of several panels 1,1a, 1b.

The first panel 1, mounted at the bottom of the roof, must be cut along a line perpendicular to its short sides. It thus takes a triangular or trapezoidal shape, and has a type B edge to receive the next panel 1a. Said panel 1a following is engaged, its edge A leaning against said edge-type B of the panel 1, after being adjusted in length through the notches 6, as indicated above. The elasticity due to the material as well as the remaining notches 6 makes it possible to compress the panels 1, 1a, 1b by putting them in place.

Thus the panels 1, 1a, 1b are held by compression between the rafters 9, their elasticity to fill the imperfections of the rafters 9 and thus remove the thermal bridges in the vicinity of the rafters 9. A pressure is exerted also by the panel 1a, 1b on the adjacent panel 1, 1a, creating again a perfectly closed joint between the two panels, the V-shaped to prevent any risk of sliding between two adjacent panels 1.

According to an embodiment not shown, one can slightly bevel edges C and D to partially compensate the elastic deformation due to the notches 6, and even beyond, create a residual bevel shape, which can be closed by foam polyurethane. This embodiment may be particularly suitable in the case of rafters 9 whose geometry is of particularly poor quality.

We see at the figure 8 mounting in sectional view. Plots 4, typically of a height of 4 mm and a diameter of 20 mm are arranged on the outer face 2 of the panel 1, thus creating an airy space under the lathing 10. This prevents moisture from settling and does not deteriorate slats 10 or tiles 11.

Once the panels 1 mounted between the rafters 9 of the drywall 12 are attached to the roof to properly close the structure, and have a hard surface that can be dressed, or for hanging objects. Due to the thickness of the panels 1 of polystyrene greater than the thickness of the rafters 9 a gap is created between the plasterboard 12 and the chevron 9, trapping an air space 13 unventilated, which is a good insulator thermal. This removes the thermal bridge linked to the chevron 9 itself.

1. a. Suppression des ponts thermiques,
2. b. Une jointure parfaite entre les panneaux,
3. c. Une longévité accrue du lattage grâce aux plots cylindriques d'une hauteur de 4mm sur sa face supérieure qui assurent une parfaite ventilation sous ce dernier.
4. d. Une facilité de pose, adaptée pour des non professionnels

This first series of variants of interior insulation panels according to the invention allow the following advantages over the state of the art:

1. at. Suppression of thermal bridges,
2. b. A perfect join between the panels,
3. vs. Longer life of the lathing thanks to the cylindrical studs with a height of 4mm on its upper face which ensure perfect ventilation under the latter.
4. d. Easy installation, suitable for non-professionals

Many variants are possible, especially from the dimensional point of view. The lengths P of the small and G of the long sides of the parallelograms as well as its angle α may vary, the panels 1 being able to have, for example, a substantially diamond-like shape, or even with a length G of the long side A, B smaller than the length P small sides C, D, without departing from the scope of the invention. Moreover, the V shape can be replaced by a tilde shape, or any other form capable of ensuring that two adjacent panels compressed towards each other remain flush with respect to each other.

The roof insulation panel manufactured according to another alternative embodiment, shown from above in FIG. 19, has two faces: the upper face 2 and the lower face 3. This panel 1 made of expanded polystyrene material in the embodiment shown in the figures has four side edges: the two large borders A and B and the two small edges C and D. Plugs 14 are disposed on the upper face 2. These pads allow ventilation of the counter battens fixed on the panel and screwed through it in the rafters of the roof (not shown). The upper face 2 still has the side of the border B of the grooves 15. These grooves 15 allow the evacuation of rainwater and condensation.

The border A is represented from front view on the panel of the Fig 10 . The reference signs representing the same elements appearing in several figures are kept identically. The border A has an upper groove 16 running over most of its length L and a deeper lower groove 17 also running over most of its length L. This length L is identical at the top and bottom, but offset. Thus, the upper face 2 is not rigorously superimposed on the lower face 3.

Border B is represented front view on the Fig 11 . This border has two tabs 18 and 19 complementary grooves 16 and 17 intended to match the grooves 16 and 17 of an adjacent panel. The lower tongue which protrudes more than the lower tongue has a groove 22 and the tongue 18 a groove 23 as it appears on the Fig. 4 which represents the border C seen from the front.

The border C has a large lower tab 20 and a small upper tab 21. These tabs 20 and 21 run over most of the length 1 of the border C.

The border D, over most of its length 1, has a lower groove 22 and an upper groove 23. The edge D of a first panel 1a cooperates with the edge C of a second panel 1b; thus the tongue 20 matches the groove 22 and the tongue 21 matches the groove 123. The faces C and D are also in the upper part of length 1 offset with respect to the length 1 of the lower parts.

The assembly of the panels 1a, 1b, 1e to obtain the roof insulation is by sliding the grooves 15, 16, 22 and 23 in the tabs 18, 19, 20 and 21.

The shape of the tabs 18, 19, 20 and 121 makes it possible to give them a clip effect during assembly of the panels. Thus, it is obtained a good flatness and a good joint between the panels.

In addition to the junction, the double groove and tongue assembly system in the upper and lower part of the edges A and B, C and D with channeling in the tongues, makes it possible to obtain the tightness and insulation of all the panels 1a, 1b and 1e assembled.

The pipes 24, 25, 26 and 27 incorporated or formed in the tongues 18, 19, 20 and 21 drain the rainwater and condensation to the sewer and prevent the installation of a roofing film as require the known groove-tongue junction systems.

Some tabs 19 and 120 have thicknesses at their ends which prohibit any gap between the panels 1a, 1b and 1c. producing a clipping effect.

This extra thickness combined with the good join avoids the thermal bridges that the tests have detected with panels of the state of the art. Thus, it is no longer necessary to add additional materials collages and foams.

• une grande bordure d'extrémité A et une petite bordure d'extrémité C présentent chacune les deux languettes, l'autre grande bordure d'extrémité B et l'autre petite bordure d'extrémité D du rectangle formées par le panneau la présentant les rainures 16, 17, 22, 23 destinées à épouser les languettes 18, 19, 20, 21 de panneaux voisins 1b, 1e de l'isolation pour toiture ;
• la première languette plus grande que la deuxième languette d'une même bordure présente un bossage d'extrémité ;
• sont prévues sur une partie de sa deuxième face des rainures d'évacuation 15 s'étendant jusqu'à une grande bordure d'extrémité B ;
• des plots 14sont disposés sur la deuxième face 2 pour assurer une ventilation parfaite sous le contre lattage ;
• au moins une rainure est plus profonde que la longueur de la languette venant l'épouser pour former une canalisation d'évacuation d'eau résiduelle ;
• les différentes parties sont en polystyrène expansé.
• les languettes 19, 20 présentent des surépaisseurs à leurs extrémités pour assurer un jointement parfait entre les panneaux dans le temps et garantir la suppression totale des ponts thermiques.

According to other advantageous features of the panel according to the invention:

• a large end edge A and a small end edge C each have the two tabs, the other large end edge B and the other small end edge D of the rectangle formed by the panel having the grooves 16, 17, 22, 23 intended to match the tabs 18, 19, 20, 21 of neighboring panels 1b, 1e of the roof insulation;
• the first tongue larger than the second tongue of the same border has an end boss;
• there are provided on a portion of its second face exhaust grooves 15 extending to a large end edge B;
• studs 14 are arranged on the second face 2 to ensure perfect ventilation under the batten against;
• at least one groove is deeper than the length of the tongue coming to marry to form a residual water discharge pipe;
• the different parts are expanded polystyrene.
• the tongues 19, 20 have thicknesses at their ends to ensure a perfect joint between the panels in time and ensure the complete removal of the thermal bridges.

The combinations of the different embodiments shown in the drawings or described above are not outside the scope of the invention.

Reference signs:

1.

Sign,

1a

Sign,

1b

Sign,

1 C

Sign,

2.

Upper face,

2a

Upper side

2b

Upper side

2c

Upper side

3.

Lower side,

3a

Lower side

3b

Lower faces

3c

Lower side

4

plots,

5

Canals,

6

nicks,

7

Small branch of the V,

8

Great branch of the V,

9

Chevrons,.

10

Lattes,

11

Roof tiles,

12

Plasterboard,

13

Air blade,

14

plots,

14a

plots

14b

plots

14c

plots

15

grooves,

16

Groove,

17

Groove,

18

Tongue,

19

Tongue,

20

Lower tab,

21

Upper tongue,

22

Lower groove,

23

Upper groove,

24

Sewer

25

Sewer

26

Sewer

27

Sewer

AT

border,

B

border,

VS

border,

D

border,

The

Great length,

1

Length of small borders.

AT

Big bottom side of panel 1,

B

Large upper side of panel 1,

VS

Small side of the panel 1,

D

Small side of the panel 1,

The

Length of the long sides of the panel,

1

Length of the short sides of the panel.

E

Space between two adjacent chevrons

The reference signs inserted after the technical features mentioned in the claims are intended only to facilitate the understanding of the latter and in no way limit the scope.

Claims (15)

Panel (1) for interior insulation of a roof to be inserted between rafters (9) of said roof, characterized in that said panel is made of a rigid insulating material, breakable and elastic, and in that it has in plan a form of parallelogram with angle (α) not right. Panel (1) according to claim 1 wherein the two edges (A, B) of said parallelogram intended to come into contact with adjacent panels are V-shaped. Panel (1) according to one of the preceding claims wherein said V-shaped is asymmetrical, the small branch (7) of the V preferably being oriented towards the outer face of said roof. Panel (1) according to claim 1 wherein several notches (6) are arranged close to the edge of the short sides (C, D) of said parallelogram, a depth greater than half the thickness (E) of said panel, preferably of the order of 80% of said thickness, making it possible, by breaking the edge at one of the notches (6), to modify the length of said panel in order to adapt it to the actual spacing observed between two rafters (9) of said roof, typically the songs (C, D) are bevelled. Panel (1) according to one of the preceding claims wherein the material constituting said panel is expanded polystyrene. Panel (1) according to one of the preceding claims wherein pads (4) are disposed on the outer face (2) of said panel to provide perfect ventilation under the lathing (10). Panel (1) according to one of the preceding claims wherein at least one channel (5) is disposed on one of the long sides of the outer face (2) of said panel, to allow drainage of the condensation water. Panel (1) according to one of the preceding claims wherein the thickness (E) is greater than that of the rafters (9) of said roof, so that by covering said panels by a non-elastic panel (12) of type plasterboard, an air gap (13) is trapped between the chevron (9) and said non-elastic panel (12), thus eliminating the thermal bridge formed by said rafters. Roof insulation comprising panels which may be according to one of the preceding claims, having on the side of the first face (2), on at least one end edge (A, D), an assembly groove with at least one tongue of an end edge (CE) of at least a second panel having the edge strip, said tongue coming to marry said groove of the first panel to stabilize the assembly formed by the assembled panels, characterized in that said panel has on said end edge on the side of its second face a second tab facing a second groove of the second panel to ensure in time the flatness and in that tabs (19, 20) have extra thicknesses to their ends to ensure a perfect joint between the panels in time and ensure the complete removal of thermal bridges. Roof insulation according to claim 9 wherein the panel (1) has a large end edge (A) and a small end edge (C) each have the two tabs, the other large end edge (B). ) and the other small end edge (D) of the rectangle formed by the panel (1a) having the grooves (16, 17, 22, 23) intended to match the panel tabs (18, 19, 20, 21) neighbors (1b, 1c). Roof insulation according to claim 9 or 10 wherein the panel (1) has the first tongue larger than the second tongue of the same edge has an end boss. Roof insulation according to claim 9, 10 or 11 wherein the panel (1) has on a portion of its second face discharge grooves (15) extending to a large end edge (B), typically at least one groove is deeper than the length of the tongue coming to marry to form a residual water discharge pipe. Roof insulation according to one of claims 9 to 12 wherein the panel (1) has studs (4) which are arranged on at least one face (2) to provide perfect ventilation under the batten. Use of panels (1, 1a, 1b) according to any one of claims 1 to 8 for a quick and direct installation between the rafters (9) of a roof. Use of roof insulation comprising insulating panels (1) with drainage grooves (15) according to one of claims 9 to 13 to ensure total waterproofness to rainwater and condensation, to powdery snow and dust.

Images