These often have a deck of plywood with a cellular insulation and metal foil vapour control layer bonded to the underside and a top layer with an overlay factory bonded to it.
Warm deck roof insulation thickness.
Composite board can be found on both warm and inverted roof applications.
A flat roof where the insulation sits below the waterproof membrane and above the structural deck is a warm roof deck.
The insulation is immediately below the waterproofing layer.
A warm flat roof or a built up roof bur is one where all the insulation is above the joists deck making them part of the warm fabric of the building.
How to install insulation in a flat roof with timber deck insulated above the joists.
The insulation may be fully or partially bonded to the vapour control layer or laid loose.
The vapour control layer is above the decking but below the insulation.
Saint gobain insulation uk manufacture and supply glass mineral wool slabs and rolls along with rigid polyisocyanurate pir boards that can be considered suitable for a wide range of applications across flat roofs whether you re looking to insulate at joist level or above the roof deck in your flat roof construction.
Warm deck the insulation is placed over the rafters and then a felt is placed on top.
Of the insulation and tacked to the joists before applying the plasterboard.
The thickness of insulation will vary depending on the manufacturer s specification.
The joist size depends on your span but assuming you are going out say 3m or so your joists would be about 150 deep.
So called because the insulating layer is located above the roof rafters and between the structural supports a warm deck roof results in a temperature for the roof and loft area that is consistent with the rest of the.
A warm roof has the insulation above the structural deck which is thus kept warm.
Add to this the firring pieces for slope say 75 max.
18 thickness of deck.
Warm deck insulation 1.
The waterproof layer is above the insulation and a vapour control layer is placed below the insulation.
Cold flat roofs are typically avoided as you d need to install ventilation which can prove problematic for many reasons relating to space labour costs etc.
The battening and tiling is then fixed down over.
Pitch roof u value 0 16 w m2k 2 warm deck pitched roof the insulation is placed over the rafters and then a felt is placed on top.
Set the quinn therm qrfr ply insulation boards onto a wide 30mm bead of vapour resistant sealant applied to the upper surface of all the joists and cross noggins.
Min 125 thickness of insulation board then finish on top.
Warm flat roofs do not need to be ventilated as the insulation is.
The warm deck roof design is the modern method for flat roof construction and is preferred wherever this option is possible.
The battening and tiling is then fixed down over.
The insulation can be adhered mechanically fixed or loose laid.
