The limiting u value the maximise u value which cannot be exceeded required under current building regulations for the roof is 0 20w m.
Flat roof extension building regs.
Building regulations for insulating a roof.
To enable compliance with the requirements of the building regulations to be demonstrated full details of the new roof will be needed including materials and their dimensions and performance properties.
When installing or repairing a flat roof you must adhere to building regulations.
Part h of the building regulations regarding drainage state that water should drain to one or two edges.
A lower u value indicates better insulation properties hence u value requirements usually specify a maximum value.
Insulating flat roof extensions.
This is placed over the roof joists and an board normally external ply is laid on top.
U value of a flat roof.
Heat rises and therefore the building regulations requirements for heat loss through roofs are more stringent than those for walls.
To comply with part l of the building regulations flat roofs must achieve u values of 0 18 w m k or lower.
The steels or rsj s rolled steel joists are often built into one or both walls to give added stability to the roof structure.
It must provide adequate protection against the elements keeping the buildings structure and interior dry.
On a basic level flat roof construction comes in the form of roofing timbers or joists as they are more commonly known or steels that are laid across two uprights walls in most cases.
Flat roof warm deck the type of insulation for this is usually of a rigid type and the thickness will vary depending on the manufacturer s specifications.
To comply with part l of the building regulations 2010 all roofs to rooms except those in unheated buildings should be thermally insulated to a maximum u value of of 0 18 w m k.
There must be a slope of 1 80.
A roof is defined in bs 6229 as a flat roof if it has a pitch of 10 degrees or less.
Flat roof this usually consists of felting which has a slight fall to allow rain water to drain off.
Below from the dwelling and has not less than three quarters of its roof area and one half its exposed wall area made from.
A flat roof must be strong durable and stable throughout its lifetime.
Thickness varies according to the manufacturer s specifications.
This usually consists of felting which has a slight fall to allow rain water to drain off to enable compliance with the requirements of the building regulations to be demonstrated full details of the new roof will be needed including materials and their dimensions and performance properties.
