Warm Flat Roof Build Up

Warm cold and inverted.

Warm flat roof build up. In the warm flat roof construction there is insulation packed into every possible space where air can flow. A lot goes into the build up between the waterproof surface of the roof and the ceiling in the room below. There are three recognised designs of flat roof construction. Or else on the interior of the building just.

Warm flat roof fully packed with insulation to prevent any condensation build up. 4 essentials for a successful flat roof like any part of a building s exterior flat roofs should be constructed to withstand natural and human forces with the minimum of attention. Flat roofs have a reputation of failing early but improvements in strength flexibility ageing and weather resistance mean that if built with care using the correct materials today s high performance felts can have a life span of up to 20 years. Warm roof build ups can be installed on most modern construction material types such as concrete timber and timber based sheets.

Flat roofs are hard to replace. Thermoplastic or elastomeric are the most effective and should extend up adjacent walls at least 150mm from the roof surface. A thermal layer of fibreglass polystyrene or other insulating material should be inserted either above the roof decking the warm roof model which is suitable for homes or permanent residences. They can be built up from profiled metal decks as the insulation selected would provide enough rigidity to span the open sections of such decks.

Where insulation above the roof void allows the air underneath to stay warm avoiding condensation but also allows for an air flow should one be deemed to be required through the joists. This could mean flat roofs may not raise the same red flags they used to. If you have an existing cold roof in need of refurbishment it should be converted to a warm roof see sketch 1 to meet part l of the building regulations. This includes structural joists to hold up a roof deck usually of timber boarding a suitable membrane to reduce the risk of condensation and a layer of insulation to keep the warmth in.

In a warm roof the thermal insulation is immediately below the membrane finish the structural deck any voids and the ceiling are at a temperature close to that of the building s interior condensation control is achieved by using an air and vapour control layer avcl on the warm side of the insulation. Some observers suggest it s harder to replace a flat roof than a traditional pitched shingle roof because of the labor required to remove its layers especially on older flat roofs. But now flat roofs often are constructed with fewer layers because of improved waterproofing technology.