The type of insulation required will depend on the immediate environment in your area and specific building regulations.
Flat roof insulation building regs.
No ventilation is required for these types of roofs.
The building regulations for flat roofs can seem like a lot to understand which is why we have put together a simple guide of the things you need to know about when it comes to considering the building regulations for flat roofs.
The roof thermal insulation would normally have to be improved.
U value of a flat roof.
It must provide adequate protection against the elements keeping the buildings structure and interior dry.
Building regulations for insulating a roof heat rises and therefore the building regulations requirements for heat loss through roofs are more stringent than those for walls.
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.
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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.
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 limiting u value the maximise u value which cannot be exceeded required under current building regulations for the roof is 0 20w m.
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.
You will need approval however if.
The removal or alteration to any roof elements could affect.
Flat roof types.
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.
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There are two ways to insulate a roof.
A lower u.
Insulation can also help to limit condensation and contribute to acoustic insulation depending on the type of insulation used.
Depending on where you live in the uk snowfall must also sometimes be considered in determining the gradient of the fall.
If you want to carry out repairs on or re cover less than 25 per cent of the area of a pitch or flat roof you will not normally need to submit a building regulations application.
In warm deck roofs however the insulation is positioned above the structural deck.
If you are replacing more than 25 of the roofing area then you will also need to replace the thermal insulation.
Summary of flat roof building regulations.
