In order to satisfactorily fulfil this function over a period of years it must be strong stable and durable.
Pitched roof u value building regs.
Flat roof this usually consists of felting which has a slight fall to allow rain water to drain off.
These are expressed as a u value which needs to be achieved.
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.
Heat rises and therefore the building regulations requirements for heat loss through roofs are more stringent than those for walls.
The below drawing shows the u value requirements set out for new properties in the building regulations for each element walls floors and roofs.
The first decision is whether to insulate a pitched roof at ceiling or rafter level.
Table 1 below shows the u values required by building regulations for each component each decade during construction of a new dwelling.
A lower u value indicates better insulation properties hence u value requirements usually specify a maximum value.
How to insulate a roof.
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To enable compliance with the requirements of the building regulations to be demonstrated full details of the new roof will be needed including.
Are u values important in the building regulations approved document part l.
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 u value requirments for building elements are outlined in part l.
Building regulations standards set the levels of thermal insulation required when carrying out building work either for new build or refurbishment projects.
The lower the u value the more efficient the construction is at keeping heat flow through the structure to a minimum.
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.
So the lower the u value the better.
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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.
In addition roofs must provide good thermal insulation and prevent the spread of fire from adjacent or adjoining properties.
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.
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.
Pitched roofs overview.
Of the building regulations 2007.
The function of a roof is to protect the building below from the weather.
