Pitched Roof Insulation Building Regulations

No ventilation is required for these types of roofs.

Pitched roof insulation building regulations.

The below drawing shows the u value requirements set out for new properties in the building regulations for each element walls floors and roofs. If the new roof covering is going to be different than the old one and this will affect the roof in the event of a fire. Warm deck this is where the insulation is placed on top of the rafters joists and the roof covering is then placed over the insulation. Each element enables the roof to span across the building and support the tiles covering on top as well as being able to transfer the loads weight created by any wind and snow down to the walls.

If the pitched roof insulation is to be installed in the rafters there are further options. Firstly will the roof insulation in a pitched roof be laid at the ceiling or the rafters. If you are replacing more than 25 of the roofing area then you will also need to replace the thermal insulation. There are two ways to insulate a roof.

The existing roof structure that forms the loft space has a number of timber elements that make the overall pitch. Final thing you should pay attention to when adding pitched roof insulation is the quality of the chosen insulation material through bba certificates and its ability to conform to the values prescribed by applicable building codes. The actual specification required for a compliant building and necessary building fabric u value targets may vary depending on the actual overall proposed specification and the outcome of the energy. As this requires fitting insulation above the rafters the roof covering will have to be removed in order to fit the insulation.

Warm roof insulation or cold roof. In addition roofs must provide good thermal insulation and prevent the spread of fire from adjacent or adjoining properties. Pitch roof this is where tiles or slates are used and a void is usually created underneath. To create a warm pitched roof insulation such as kingspan kooltherm k7 pitched roof board should be fitted between and over the rafters.

According to the uk building regulations pitched roofs should achieve the u value of 0 18 w m2 depending on. The limiting u value the maximise u value which cannot be exceeded required under current building regulations for the roof is 0 20w m. Summary of flat roof building regulations. Flat roof this usually consists of felting which has a slight fall to allow rain water to drain off.

In order to satisfactorily fulfil this function over a period of years it must be strong stable and durable. There is a requirement when refurbishing a roof to. Cold deck this is where the insulation is placed between the joists rafters or in between the ceiling joists in the case of a pitch roof. The function of a roof is to protect the building below from the weather.

Pitched roofs overview.