Warm Roof Soffit Detail

Flat soffit stopping at end wall.

Warm roof soffit detail.

The flat roof shown above shows warm deck roof construction. Aluminum soffit and fascia absorb heat and will make your roof and attic extremely hot which will decrease your home s overall energy efficiency because you ll have to rely more on your air conditioner. Due to the insulation being over the top of the roof the timber structure beneath is warm which is why the term warm roof is formed. The fall of the roof is achieved by using firring pieces with a fall of 1 in 40.

Warm roof construction requires that the entire roof construction is encapsulated within the insulation envelope of the building to be kept warm. Vinyl soffit and fascia are the clear winners. Additional construction details drawings. Steve from london flat roofingexplains how warm flat roof construction works in this excellent short video.

There is no reason to use a pork chop eave. The ceiling joists are used as the platform for the roof coverings. A warm flat roof is formed by placing a layer of insulation over the top of the roof structure. Cad details document name pdf dwg download all cad construction details 37 1 mb 3 4 mb mc01 identification of roof areas 694 kb 167 kb mc01a single layer underlayment 678 kb 302 kb mc01b double layer underlayment 711 kb 322 kb mc02 vent pipe flashing 626 kb 349 kb mc03 valley.

If you are not able to use an angled soffit use one of the two flat soffit details illustrated below. Fascia and soffit construction details most houses have fascia running along all of the eaves the overhangs at the bottom of the roof. Although there is a low risk of condensation with warm roof construction it is very difficult to seal all joints gaps and penetrations against all water vapour transmission. In this type of construction the insulation is placed below the waterproof covering and on top of the roof deck and vapour barrier.

This is a detail to avoid at all costs. Warm deck roof a warm deck roof is where the insulation is placed on top of the rafters joists and the roof covering is then placed over the insulation. No ventilation is required for these types. The object being to design out the possibility of warm moisture laden air coming into contact with a cold surface and condensing.

Vinyl is resistant to cracking warping and rotting so it s virtually maintenance free. If you must use a flat soffit stop the flat portion of the soffit at the wall to align with the corner board.