Once up at roof level the between rafter boards can be cut accurately to fit the rafter spacings.
Roof rafter insulation boards.
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.
This means insulating between or below the sloping beams that form the construction and support a sloping roof.
Being lightweight they do not impose significant additional loads on existing structures.
The construction build up for this can be seen on our online u value calculator.
As this requires fitting insulation above the rafters the roof covering will have to be removed in order to fit the insulation.
The previous four options are all used beneath the roof.
The rafters are joined together by a horizontal ridge board at the top and tied together by ceiling joists at the bottom.
Kingspan with a warm roof the usual process is to split the insulation into two layers.
Our insulation solutions for warm roofs maximise both space and thermal efficiency whilst also contributing to acoustic performance.
Squeeze to fit for easy installation between rafters or floor joists.
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.
Bare foam board one sided sheathing board or double sided which is also reference as structural insulated panels.
Rigid foam board is just above the roof deck or an exterior insulation option.
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.
Rigid polyisocyanurate pir foam insulation boards from celotex are among the most thermally efficient commonly available insulation materials on the market.
It typically has 3 variations.
Insulation is friction fitted between rafters with the option to underline the rafters with a layer of thermal laminate to further enhance thermal performance.
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.
To create a warm pitched roof insulation such as kingspan kooltherm k7 pitched roof board should be fitted between and over the rafters.
Made from flame retardant material.
This roof type will require a breathable membrane like kingspan nilvent to be fitted above the insulation.
Insulating the roof above the rafters is known as warm roof insulation as the rafters are brought into the insulated envelope of the building.
Full installation instructions included.
Uncompressed size 610 x 402 x 60mm.
Fits rafter or joist spacings of between 320mm and 395mm.
There will also be kooltherm k7 pitched roof board between the rafters image credit.
Insulating the rafter space will give you a warm loft.
Pack of 3 total cover is 0 74m.
