Sprayed underside roof insulation?
Question:Anyone had this installed? bit worried about long term effects and what happens if the roof needs repairing. Would appreciate comments from anyone who has had it done or knows more about the process.
Answers:
Please,please,please,whatever you do, DO NOT have this done. The foam can clog up the drain channels in the tiles/slates, causing water to back up and enter the roof void. It prevents the roof from "breathing", causing condensation,interstitial condensation, and consequently reducing the effectiveness of the existing quilt loft insulation. Also, if in the future you come to sell your home and a building surveyor spots that you've had this work done, he will advise the prospective buyer to knock off the cost of having the roof recovered (average £4000+ for a terraced house slate roof), so any meagre benefits the insulation company may claim you will gain, will be lost many times over. The problems with this type of roof insulation are almost always condensation based, and many European countries have requirement that there be 50mm of space between the foam and the roof covering, so the "spray on" method is not really viable. Also, as you said, roof repairs will be a nightmare!
dont do it, they are all a big con, it cause condensation and rotting timbers, they charge a fortune too.
some companies have been on BBC1s watchdog programme.
http://www.bbc.co.uk/consumer/tv_and_rad...
http://www.diynot.com/forums/viewtopic.p...
http://www.diynot.com/forums/viewtopic.p...
the whole system is flawed, have a read of the forums. There are people who have it, but wont know the damage it is doing for another 10 years. I had one of their salesman call round, very arrogant and not interested once i said i would get another quote before signing up.
Doing this will not stop the roof from aging, a slate roof will grow old and crumble away from the insulation. Anyway, if you insulate the roof itself, you will be losing all the heat needed to fill the roof space, better to lay at least 6 inches (150mm) glass fibre on the top of your ceiling. (And if you are a Scotsman, you could always take it with you if you move house...... OK Scotsmen come at me two at a time, I can handle you all, no sense of humour have you?
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