How to insulate a roof.
Pitched roof u value building regs.
Pitch roof this is where tiles or slates are used and a void is usually created underneath.
These figures are the notional dwelling specification to demonstrate compliance as the regulations do allow a slightly worse performance of one component if it is compensated by better performance of another.
The limiting u value the maximise u value which cannot be exceeded required under current building regulations for the roof is 0 20w m.
Table 1 below shows the u values required by building regulations for each component each decade during construction of a new dwelling.
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These are expressed as a u value which needs to be achieved.
A lower u value indicates better insulation properties hence u value requirements usually specify a maximum value.
In addition roofs must provide good thermal insulation and prevent the spread of fire from adjacent or adjoining properties.
The below drawing shows the u value requirements set out for new properties in the building regulations for each element walls floors and roofs.
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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.
Heat rises and therefore the building regulations requirements for heat loss through roofs are more stringent than those for walls.
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 first decision is whether to insulate a pitched roof at ceiling or rafter level.
The u value requirments for building elements are outlined in part l.
U value requirements the u value of a building element i e walls floors or roofs is a measure of the thermal efficiency or heat loss through that element the lower the u value the better the thermeal efficiency of the element.
Flat roof this usually consists of felting which has a slight fall to allow rain water to drain off.
The function of a roof is to protect the building below from the weather.
The lower the u value the more efficient the construction is at keeping heat flow through the structure to a minimum.
Pitched roofs overview.
So the lower the u value the better.
Of the building regulations 2007.
According to the uk building regulations pitched roofs should achieve the u value of 0 18 w m2 depending on the circumstances.
Are u values important in the building regulations approved document part l.
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.
To enable compliance with the requirements of the building regulations to be demonstrated full details of the new roof will be needed including.
