Celotex high performance thermal pir insulation boards for insulating between and over rafters with thicknesses ranging from 12mm to 200mm and lambda as low as 0 022 w mk.
Celotex roof insulation between rafters.
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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 pitched roofs whether you re looking to insulate at joist level or at rafter level in your pitched roof construction.
As for insulating below the joists an insulating laminate insulation bonded to plasterboard such as celotex pl4000 or a separate rigid pir insulation board finished with a separate sheet of plasterboard can be securely fixed to the joists to provide an internal finish to the roof.
Being lightweight they do not impose significant additional loads on existing structures.
Alternatively battens can be secured to the underside of the.
2 insulation between and over rafters.
Where headroom and rafter depth is limited celotex insulation may be fitted between and over the rafters.
Depending on the specifics of the roof it may be possible to fully fill the rafter depth or in most cases leave a 25mm or 50mm air gap between the top face of the insulation and the.
Celotex polyisocyanurate pir foam insulation boards are easy to cut and handle.
The saint gobain insulation uk u value calculator gives you instant access to calculating a proposed insulation thickness and product options or giving an indicative calculation on a proposed construction detail.
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Once up at roof level the between rafter boards can be cut accurately to fit the rafter spacings.
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