Cold Flat Roof Fascia Detail

Flat roof details and information relating to insulating a flat roof.

Cold flat roof fascia detail.

Downspout strap detail 1 4 dia. Whether the joists are angled or you use firrings. 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. No flat roof is truly flat.

Your flat roof construction detail drawing has one obvious mistake. Attention should be paid to bs5250 control of condensation in. No one online shows you this which is. A flat roof must be strong durable and stable throughout its lifetime.

A roof is defined in bs 6229 as a flat roof if it has a pitch of 10 degrees or less. Or 050 stain less stl. In a cold roof construction the sarnafil membrane is installed directly to the structural decking usually timber with firrings to fall. Similar to the pitched roof a flat roof can be insulated as a cold or a warm deck.

The position of the insulation dictates which type it is. To be 48 oz. There must be an adequate void minimum 50mm between the deck and the insulation traditionally mineral wool to allow free movement of air and to prevent moisture vapour being transmitted from the building outwards where it could condensate in the roof. X 5 8 bolt brass alum.

For cold flat roofs the vapour layer needs to be positioned underneath the insulation layer on top of the room below to create an effective barrier. It must provide adequate protection against the elements keeping the buildings structure and interior dry. Details both in 2d and 3d to give a clear understanding. Flat roof types.

The other is putting osb and insulation on even a slightly sloping roof means everything from the top of the joist up will not be plumb but run at an angle. This detail for cmu installation only. When we talk about a warm roof vs a cold roof what we re really talking about is the insulation of the flat roof. Ventilation must also be provided through the eaves or roof ridges using fascia vents or the skylight upstand on the roof.

Basically there are two options to choose from when insulating a flat roof.