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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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Old Mineral Felt Roof

Enquiry Regarding Old Mineral Felt Roof

I have converted the garage into a games room and the ceiling has damp patches and the fuse has blown for the lighting. The roof has a drainage hole in one corner which is not very effective , as I have previously seen water pooling on top of the roof.  I would also like better insulation in the roof as there is a lot of heat loss and wind that comes through the ceiling light fittings.

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Solar Reflective Paint Asphalt

Insulating a Flat Roof With Tapered Insulation

Not only are we insulating this old felt roof, but we are also reversing the way the water drains on the roof; one side of the roof is going to be built up so that all the water drains in the opposite direction. In the attached photos you can see we’ve started to set up some of the insulation, and we’re working out just how this jigsaw puzzle goes together.

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Decking Over GRP Roof Pimlico

Problem With GRP Flat Roof

7 years ago we bought a 3 storey house in Pimlico with the intention of retiring there sometime around 2014. One of the attractions of the property was that the entire roof was a roof garden of some 45.1 square metres. We did the place up in order to rent it, which included installing a new GRP roof and new lead flashings. We then put timber decking over this as the walking surface of the roof garden.

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