There will also be kooltherm k7 pitched roof board between the rafters image credit.
Warm pitched roof insulation thickness.
For a warm roof solution you will need to install insulation in the plane of the roof pitch that is immediately below the sloping roof.
Cold deck the insulation can be placed between the rafters or it can be placed between the ceiling joists.
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.
Level for a cold pitched roof or at rafter level if a living area within a warm roof construction is desired.
This will help to avoid your roof space becoming.
It is possible to achieve very high levels of insulation in pitched roofs where the insulation is positioned at ceiling level because the insulation thickness is largely unrestricted by construction considerations.
A range of high performance insulation products for a variety of pitched roofs including loft insulation between and over rafters and pitched roof sarking.
The idea behind a vapour control layer is to install it on the room side of the insulation so it blocks the passage of warm moist air rising into the pitched roof structure.
Our u value calculator is free and simple to use for calculating u values specific to your roof construction design.
When specifying the insulation for the pitched roof it is important that the thickness of insulation used achieves the required u value.
A major factor influencing the design of pitched roofs with insulation at ceiling level is the type of roof tile underlay chosen.
Cold deck roof a cold deck roof is where the insulation is placed between the joists rafters or in between the ceiling joists in the case of a pitch roof.
Kingspan with a warm roof the usual process is to split the insulation into two layers.
There is a requirement when refurbishing a roof to have a minimum u value of 0 18 w m k in england and wales but for a complete re roof in wales the minimum u value required is 0 15 w m k.
Introduction warm cold roofs this guidance offers guidance on the difference benefits between warm and cold roofs.
The battening and tiling is then fixed down over.
This approach can be used to create an unventilated roof structure helping to keep out unwanted drafts.
As there s no insulation below rafters headroom is maximised creating more useable space.
The below table shows the thickness of insulation required for a typical warm roof construction with insulation fitted above the rafters.
The roof insulation thickness will vary dependent on the required u value.
Warm deck the insulation is placed over the rafters and then a felt is placed on top.
Ventilation is required for these roofs.
