There should be no insulation below the deck and no ventilation is required.
Warm flat roof insulation regulations.
Others would treat even steeper pitches as flat roofs.
Insulating the roof the cold roof method means you place the insulation between the joists with ventilation above the roof insulation.
Below that there are more detailed guides to the thermal insulation parts of building regulations standards.
Warm deck roof with this type of roof the insulation is placed above the roof deck but below the weatherproofing.
Insulation can also help to limit condensation and contribute to acoustic insulation depending on the type of insulation used.
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.
With a warm roof the usual process is to split the insulation into two layers.
Warm roof construction is considered to be much more efficient and is an easier build.
There are two types of flat roof.
Insulating a flat roof using the warm roof construction method means you place the roof insulation over the timber decking.
When building a flat roof it is vital that a degree of falls is built into the construction to ensure rainwater run off.
Cold roofs have the waterproof layer placed directly onto the roof deck and the insulation inside the roof just above the ceiling.
Inverted warm deck roof.
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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 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.
The insulation boards in an inverted warm deck are laid over the structural deck and the waterproof covering.
Ventilation is required for these roofs.
The sandwich warm deck roof is the most common type of flat roof.
For guidance on roof insulation please contact us on 44 01257 488 000.
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.
Find warm flat roof cold flat roof insulation solutions at iko polymeric.
As you can see below there are separate regulations for england wales and scotland.
Warm deck sandwich or cold deck.
Flat roofs there are two common forms of construction for flat roofs.
U value of a flat roof.
