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.
Warm flat roof insulation regulations.
In this case ventilation is required and the roof can still become wet with condensation which may cause materials to decay.
The sandwich warm deck roof is the most common type of flat roof.
If 180mm is to be installed then 100mm board might be introduced between the rafters there has to be a minimum 25mm air gap between the insulation and the underside of the tiles or slates with an 80mm board running across the rafters.
The definition of a flat roof according to bs 6229 is having a pitch less than 10 o to the horizontal however some in the industry would consider up to 15 o as their definition of a flat roof.
Warm roof construction is considered to be much more efficient and is an easier build.
Flat roofs there are two common forms of construction for flat roofs.
Ventilation is required for these roofs.
The insulation is placed below the waterproof covering and is either mechanically fixed or bitumen bonded on to the top of the deck.
Cold roofs and warm roofs.
Warm deck roof with this type of roof the insulation is placed above the roof deck but below the weatherproofing.
Insulating a flat roof using the warm roof construction method means you place the roof insulation over the timber decking.
There should be no insulation below the deck and no ventilation is required.
Inverted warm deck 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.
U value of a flat roof.
Warm deck sandwich or cold deck.
Insulation can also help to limit condensation and contribute to acoustic insulation depending on the type of insulation used.
As you can see below there are separate regulations for england wales and scotland.
Cold roofs have the waterproof layer placed directly onto the roof deck and the insulation inside the roof just above the ceiling.
With a warm roof the usual process is to split the insulation into two layers.
Find warm flat roof cold flat roof insulation solutions at iko polymeric.
Others would treat even steeper pitches as flat roofs.
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.
Insulating the roof the cold roof method means you place the insulation between the joists with ventilation above the roof insulation.
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There are two types of flat roof.
The insulation boards in an inverted warm deck are laid over the structural deck and the waterproof covering.
