Pitched Concrete roof heat insulation

External heat insulation of concrete pitched roof

The external insulation housing and separated in conventional inverted type according to the position of the heat insulating in relation to the sealing layer as in roof insulation:

Conventional Roof external insulation

A roof made of reinforced concrete needs a flattening layer of lightweight concrete made with specific granules Expanded Polystyrene ISOLBETON density of 300kg/m3 for minimal impact on the construction, and for additional thermal and sound insulation. Onto the lightweight concrete is welded or riveted a film that would serve as a vapor barrier. With wooden planks a grid is formed and in the spaces between we place the insulation material. On top we position the sealing membrane, which is nailed to studs onto wooden rafters. In the position of each pin is inserted washer synthetic rubber or other elastic material in order to prevent water penetration of the positions of the holes opened in the film. Alternatively, it can be formed a second wooden substrate above the insulating layer and the sealing membrane can be nailed or glued on that.

Above the membrane at regular intervals are fixed horizontal slats for anchoring of tiles between which is positioned the second layer of thermal insulation material to reduce the thermal bridges created by wooden beams of the first layer. If prior to the placement of horizontal cubits interposed another layer of wooden rafters, the roof is ventilated using suitable ventilation holes for the inlet of air from the edge of the tile and the exit of the hot air longer than the ridge of the roof. In this case if the second insulating layer used to create a ventilation gap then the thickness of the thermal insulation should be smaller than the thickness of the purling.

For the first heat insulating layer is suggested the use of Expanded Polystyrene with graphite ΝΕOCOAT TX EPS 100 or ISOPLAK TX EPS 120, ISOPOR EPS 150 and ISOCOAT TX EPS 80 and for the second ΝΕOCOAT TΤ EPS 100 or ISOPLAK TX-ΤΤ EPS 120 and ISOCOAT TΤ EPS 80 in total thickness according to the regulation of Energy Efficiency of Buildings.

Inverted Roof external insulation

A roof made of reinforced concrete needs a flattening layer of lightweight concrete made with specific granules Expanded Polystyrene ISOLBETON density of 300kg/m3 for minimal impact on the construction, and for additional thermal and sound insulation. Onto the lightweight concrete is welded or riveted a film that would serve as a vapor barrier. In the case of the inverted type, the membrane is operated both as a vapor barrier and sealing layer. With wooden planks a grid is formed and in the spaces between we place the insulation material. Alternatively it can be covered by wooden substrate or left free.

Above the insulating layer at regular intervals horizontal slats are fixed for anchoring the tiles between which is positioned the second layer of thermal insulation material to reduce the thermal bridges created by wooden beams of the first layer. If prior to the placement of horizontal cubits interposed another layer of wooden rafters, the roof is ventilated using suitable ventilation holes for the inlet of air from the edge of the tile and the exit of the hot air longer than the ridge of the roof. In this case if the second insulating layer is used to keep a gap for ventilation then the thickness of the thermal insulation should be smaller than the thickness of the purling.

For the first heat insulating layer is suggested the use of Expanded Polystyrene with graphite ΝΕOCOAT TX EPS 100 or ISOPLAK TX EPS 120, ISOPOR EPS 150 and ISOCOAT TX EPS 80 and for the second ΝΕOCOAT TΤ EPS 100 or ISOPLAK TX-ΤΤ EPS 120 and ISOCOAT TΤ EPS 80 in total thickness according to the regulation of Energy Efficiency of Buildings.

Alternatively, instead of using the heat insulating materials above, we can use the system for inclined roofs ISOLTETTO which is shaped Expanded Polystyrene (EPS) with special airing channels and channels/drivers for the placement of horizontal benchmarks in the suitable way for the Roman and Dutch (concrete) tile with surface 35,7cm and eliminates any thermal bridges thus a second heat insulating layer and layer of airing is not needed. It is placed in suitable thickness according to the regulation of Energy Efficiency of Buildings. ISOLTETTO offers big facility and speed in the manufacture assembling in one layer all the rest.

The ventilation on the roof in countries like Greece with sunshine is absolutely necessary because the tiles grow temperatures above 60 ° C during summer because the sun's rays hit the roof almost perpendicular to the longest day of sunshine and lead to overheating of the roof complicating the task of insulating layer in the event of a special thermal bridges but without them. The layer of suitably calculated airing layer with rightly calculated holes in the base and the top of tile layer abducts in permanent base part of heat that absorb the tiles and turns it in the atmosphere, since motionless air that exists between the tiles and the heat insulating layer is kept warm, its density is decreased and goes up coming out from the holes at the top of the roof giving its place to fresh cool air creating a current of air that helps the operation of the roof and the heat insulating layer.