Being lightweight they do not impose significant additional loads on existing structures.
Roof rafter insulation boards.
Fits rafter or joist spacings of between 320mm and 395mm.
Bare foam board one sided sheathing board or double sided which is also reference as structural insulated panels.
Celotex polyisocyanurate pir foam insulation boards are easy to cut and handle.
To create a warm pitched roof insulation such as kingspan kooltherm k7 pitched roof board should be fitted between and over the rafters.
Rigid polyisocyanurate pir foam insulation boards from celotex are among the most thermally efficient commonly available insulation materials on the market.
Once up at roof level the between rafter boards can be cut accurately to fit the rafter spacings.
There will also be kooltherm k7 pitched roof board between the rafters image credit.
Both products are high performance pir insulation boards which have been specifically designed for this type of roof construction.
Reduces heat loss and energy bills.
Full installation instructions included.
Made from flame retardant material.
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 sarking membrane.
The rafters are joined together by a horizontal ridge board at the top and tied together by ceiling joists at the bottom.
The previous four options are all used beneath the roof.
If 180mm is to be installed then 100mm board might be introduced between the rafters there has to be a minimum 25mm air gap between the insulation and the underside of the tiles or slates with an 80mm board running across the rafters.
As this requires fitting insulation above the rafters the roof covering will have to be removed in order to fit the insulation.
Squeeze to fit for easy installation between rafters or floor joists.
Kingspan with a warm roof the usual process is to split the insulation into two layers.
Insulating a pitched roof above the rafters is the common method chosen for new builds and re roofing existing detached buildings as it provides superior thermal performance for the building.
This means insulating between or below the sloping beams that form the construction and support a sloping roof.
For this method of pitched roof insulation we recommend using quinn therm qr roof insulation boards between the rafters and quinn therm ql kraft insulation boards below the rafters.
Insulating the rafter space will give you a warm loft.
Uncompressed size 610 x 402 x 60mm.
It typically has 3 variations.
Insulating the roof above the rafters is known as warm roof insulation as the rafters are brought into the insulated envelope of the building.
This roof type will require a breathable membrane like kingspan nilvent to be fitted above the insulation.
Rigid foam board is just above the roof deck or an exterior insulation option.
The construction build up for this can be seen on our online u value calculator.
