FR2469509A1 - Undulating expanded polystyrene sheet - to support insulation between roof rafters and provide channels for ventilation - Google Patents

Abstract

An undulating sheet profile is fixed to the underside of a conventional tiled roof to support a layer of insulation material sprayed on to the underside of the sheet. The undulating profile provides channels for air to circulate between the tiles and the insulation to reduce the degree of thermal shock due to variations in external temps. Pref. the undulating sheet is made of expanded polystyrene of density 10-25 kg/m3 in stepped corrugations with a depth of 3-15 cm and a pitch of 10-30 cm. Specifically claims use as panels 100-250 cm long, 50-125 cm wide, laid between the rafters with the channels parallel to the rafters.

Description

 The present invention relates to a method of thermal insulation of a traditional inclined sub-roof, with the aid of an insulating product applied by projection onto a support of a special shape enabling the roof to retain its usual characteristics.

 To date, various methods of insulating a sub-roof are known, using insulators such as glass wool, rock wool, expanded polystyrene or composite materials in the form of rolls, mattresses, panels, sheets. , etc. These methods have the drawback of using complex implementation techniques: ventilation must be preserved between the insulating layer and the covering (tiles, shingles, slates, etc.) in order to limit the thermal shock received by this roofing and prevent its deterioration (bursting of the tiles). As otherwise it is necessary to protect the insulation from humidity or the direct action of water in case of failure of the 'waterproofing of the roof, it is necessary to provide a waterproof film between the cover and the insulation; ventilation between waterproof film and insulation is necessary to prevent condensation in the insulation.

It can therefore be seen that this technique is complicated, requires double ventilation and is generally difficult to implement.

 The process which is the subject of the invention makes it possible to avoid these drawbacks.

 It consists in placing under the roof, between the rafters and under the battens, sheets of expanded polystyrene of low thickness comprising a profile of special shape and making it possible to ensure ventilation between insulation and roofing. An insulating product put in place by projection is applied to the polystyrene sheets, between the rafters, to a thickness of several cm. When the volume under the roof must be fitted, it is possible to fix under the rafters or purlins a finishing facing (cardboard plasterboard, paneling, particle board, plywood, etc ...).

The invention will be better understood on reading the particular examples of implementation given below without implied limitation.

According to a first embodiment of the invention, there is shown in Figure] a cross section of an insulated roof according to the invention, in Figure 2 a vertical section of this dreary roof.

 The battens (1) are fixed according to traditional techniques on the rafters (2) and support the cover consisting of mechanical tiles (3) or any other material usually used (shingles, slates, etc ...). The special expanded polystyrene plates (4) are fixed under the battens (]), by stapling or nailing; These special plates (4) are shown in FIG. 3, and have longitudinal waves or grooves with a pitch of 10 to 30 cm. The thickness of the plate is small, 1 to 3 cm, compared to its other dimensions: width 50 cm to 125 cm, length 100 cm to 250 cm.

 The special plates are cut to precise dimensions on site so that they can be adjusted between two successive rafters. Covering at the end of the plate is always done according to the configuration (5), so that any water infiltration under the cover is evacuated.

The insulation (6) to be applied by spraying is applied between the rafters, on the polystyrene profile plate. The thickness of this insulating layer is such that its surface is flush with the underside (7) of the rafters, or exceeds and coats this underside, providing dirty insulation (6a) in line with the rafter.

A finishing facing (8) is fixed under the rafters. This facing optionally includes a vapor barrier (9) preventing vapor migration to the insulation.

 According to another embodiment of the invention, we see in Figure 4 a vertical section of an insulated roof according to the invention.

 The battens (10) are fixed according to traditional techniques on the rafters (13) by stapling or nailing. The insulator (12) to be applied by projection is used between the purlins (13) on the polystyrene profiled plates (14). The thickness of this insulating layer is several centimeters, its maximum thickness being limited to the height of the purlins but may be less as er. (15).

 A finishing facing (16) with or without vapor barrier is then fixed under the purlins (13).

 The process which is the subject of the invention allows thermal insulation of an underlay to be produced very economically, but can also be used in other cases where the support wall does not allow direct projection of an insulator. , or that ventilation is required between the support and the insulation.

The main advantages of the process are as follows:
- it makes it possible to produce a ventilated air gap between the layer of insulating material and the cover, thus avoiding any thermal shock on this cover.

- In case of cover failure, damaged cover, accidental water infiltration, snow blown by the wind, any water passages through the cover do not reach the insulation of the roof and therefore do not alter not the thermal insulation itself: the water is evacuated thanks to the ribbed polystyrene plate.

 - The insulation support consisting of a special sheet of expanded polystyrene, (or any other material having identical mechanical characteristics, water tightness and vapor permeability characteristics), comprising ribs or longitudinal waves, due to its minimal thickness, very low resistance to the passage of water vapor. There is therefore no risk of condensation in the insulation.

 - In case it is necessary to install a vapor barrier in front of the insulation (for example for rooms with very high humidity), this vapor barrier can be put in place before the finish facing or can even be previously glued to the finish siding.

The process which is the subject of the invention can be used in all cases where the application of an insulation by spraying cannot be done directly for various reasons 9 need for ventilation, impossibility of adhesion on the support. it can be used for thermal insulation of apartment buildings, industrial, commercial or public premises. A particularly interesting application is the insulation of roofs of residential houses.

Claims (4)

1. A method of thermal insulation of traditional inclined roofs using an insulating product applied by spraying onto a support, characterized in that this support has a special shape enabling the roof to retain its usual characteristics.  2. Method according to claim 1 characterized in that the specially shaped support comprises waves or longitudinal ribs exceeding 10 to 30 cm and 3 cm to 15 cm high. 3. Method according to claims 1 and 2 characterized in that the specially shaped support consists of an expanded polystyrene plate of density 10 to 25 kg / m3, of length 100 cm to 250 cm, of width 50 cm to 125 cm and of low thickness with regard to these latter dimensions.  4. Method according to claims I and 2 characterized in that the specially shaped support may be made of a material other than expanded polystyrene but having mechanical characteristics, water tightness characteristics and permeability to identical steam.