A lower u value indicates better insulation properties hence u value requirements usually specify a maximum value.
Pitched roof u value building regs.
The function of a roof is to protect the building below from the weather.
The below drawing shows the u value requirements set out for new properties in the building regulations for each element walls floors and roofs.
Pitch roof this is where tiles or slates are used and a void is usually created underneath.
To enable compliance with the requirements of the building regulations to be demonstrated full details of the new roof will be needed including.
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.
Flat roof this usually consists of felting which has a slight fall to allow rain water to drain off.
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.
In addition roofs must provide good thermal insulation and prevent the spread of fire from adjacent or adjoining properties.
These are expressed as a u value which needs to be achieved.
The lower the u value the more efficient the construction is at keeping heat flow through the structure to a minimum.
Are u values important in the building regulations approved document part l.
Pitched roofs overview.
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The first decision is whether to insulate a pitched roof at ceiling or rafter level.
Building regulations standards set the levels of thermal insulation required when carrying out building work either for new build or refurbishment projects.
How to insulate a roof.
Heat rises and therefore the building regulations requirements for heat loss through roofs are more stringent than those for walls.
According to the uk building regulations pitched roofs should achieve the u value of 0 18 w m2 depending on the circumstances.
In order to satisfactorily fulfil this function over a period of years it must be strong stable and durable.
So the lower the u value the better.
Wall 1 with u value of 0 3 w m2 k will lose heat at half the rate of wall 2 which has a u value of 0 6 w m2 k.
The limiting u value the maximise u value which cannot be exceeded required under current building regulations for the roof is 0 20w m.
The required u value will depend on the location of the project england scotland or wales type of building domestic or non domestic and the application floor wall or roof.
Table 1 below shows the u values required by building regulations for each component each decade during construction of a new dwelling.
Of the building regulations 2007.
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