Warm Roof Cold Roof

Warm Roof & Cold Roof Venting

Warm Roof & Cold Roof Venting

I had the conversion done 20 years ago. The flat roof has a very shallow slope and consists of joists, surmounted by furring pieces, transverse spacing battens for ventilation, ply deck with mushroom ventilators, and multiple felt layers.  It is also penetrated by a soil pipe near the condensing boiler vent. The ply deck appears to be in sound condition but blackened, presumably by condensation. 

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New Flat Roof Wembley HA0

New Flat Roof Wembley HA10

As you can see when I went to look at this roof it was cold and snow was still around. Apart from the flashings being all over the place the roof looked quite flat, an easy one to overlay! If you look at the roof around the pipe in the center you can see that its cracked and the roof is actually leaking badly from this area, its very hard to get the old type felts to dress around details like the pipe.

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Stripping an Old Felt Roof Laid Onto Decking

Note the little dots on the decking, indicating they opted to use a perforated 1st coat of felt. The idea behind this is that the 2nd coat of felt will only partially bond to the decking. This ensures that when it fails, the next roofer can remove the old felt without having to hack away at the decking. This can be a common problem, because when roofers don’t follow manufacturers’ instructions, and fully bond the roof, the cost of removing the old roof covering could be considerably more expensive.

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Parapet Wall Chimney Pots Being Dressed With EPDM Single Ply Rubber

This gives an idea as to what we were up against. Our specification for this new flat roof was to strip the old roof, apply insulation and re-roof using EPDM rubber. Just what we were going to do with the parapet walls and chimneys was always going to be up for debate and, as part of the pricing, we had discussed that a Provisional Costs (PC) sum should be put to one side to deal with the renovation of this area.

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Thermal Bridging of an Insulated Flat Roof, Through the Front Fascia

In this video I explain problems with insulating a roof using the warm and cold roof construction methods. Whatever new flat roof covering you choose, e.g. EPDM rubber, Kemper, Liquid Rubber Triflex, if the specification of the insulation is not correct you could have problems which could include rotting joists.

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