Alternative roofing
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smokey-fitz wrote: »Great job, looks good. How is this roof cost wise as apposed to a standard slate roof? I have an old farm yard stone shed im planning to renovate, starting to get quotes this coming week.
Also what way are you doing insulation? Are you getting insulated cladding or insulating it seperate? Or both?
It's insulated separately. It's called a warm roof. 100mm PIR board on top of the rafter and rock wool or similar between the rafters. 18mm plywood on top of PIR , then a breathable membrane and fix sheeting straight to it.
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Superdaddy wrote: »It's insulated separately. It's called a warm roof. 100mm PIR board on top of the rafter and rock wool or similar between the rafters. 18mm plywood on top of PIR , then a breathable membrane and fix sheeting straight to it.
Looks good.. lovely view too. Thanks for the tip, sounds like a great job too.0 -
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Provided the builder is well experienced leaks shouldn't be a huge risk. What I would say is that in the last 7 or 8 houses I've priced there has been torch on felt and single ply membranes specified as the finish on the roof. It is just my opinion but I think these finishes are a quick job. If it were my own house I wouldn't consider them, an asphalt flat roof really is the only flat roof. If you do for some reason go for torch on felt, make sure that the installer doesn't use a roll of this felt and a roll of that felt, make sure it is a complete roof system from the one manufacturer and make sure you get a written guarantee from the manufacture at the end, generally at some stage a rep from the company will call during the installation to take a few pictures and provide some level of quality control.
We built a lot of flat roof buildings, in the UK in particular (see pics of but one), and I would have to disagree - even our own office building is flat-roofed, and in a single ply membrane. For clarity, we don't do the water-proofing, only the structure under it.
Bituminous membranes / asphalt I wouldn't put on any roof these days, and have not long ago replaced that with a single ply membrane on my mother-in-laws house - after 2 x claims with insurer for leaks, they simply declined to repair it any more, and we put a new mono-pitch roof on it instead, with a single ply membrane.
Asphalt is not maintenance-free, and that's the issue imho.
Another finish to consider, and which I like, is GRP -Glass Reinforced Plastic.
Whichever you pick, as above, buy a 'system' with a comprehensive guarantee.
As others have pointed out though, insurance on any flat roof building is a major problem here. The rule of thumb is that if the flat area exceeds 15% of the total area, and providing you can even get a quote, then you could be looking at up to a large loading - multiples of a 'standard' house in fact.
The other thing to bear in mind is the definition of a 'flat roof'. You can have a 'flat roof'.....at 30 degree pitch
... so there is a scope to design something that is 'flat' but at a pitch above that which would fall foul of insurers rules. I can't remember for sure, but I think the pitch to stay above is 5 degrees. Ode To The Motorist
“And my existence, while grotesque and incomprehensible to you, generates funds to the exchequer. You don't want to acknowledge that as truth because, deep down in places you don't talk about at the Green Party, you want me on that road, you need me on that road. We use words like freedom, enjoyment, sport and community. We use these words as the backbone of a life spent instilling those values in our families and loved ones. You use them as a punch line. I have neither the time nor the inclination to explain myself to a man who rises and sleeps under the tax revenue and the very freedom to spend it that I provide, and then questions the manner in which I provide it. I would rather you just said "thank you" and went on your way. Otherwise I suggest you pick up a bus pass and get the ********* ********* off the road”
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pauldavis123 wrote: »Glass fiber is the only one, think about it, they build boats out of it.
Most products come back to the fitter, fail to correctly ventilate glass fibre and your boat may just hit an ice berg
Also Glass fibre needs a parapet with zinc or plaster or cedar or something on it because I could think of nothing worse than looking at glass fibre every morning. Out of general curiosity what kind of guarantees are going with glass fibre roofs anyone know?? 0 -
Most products come back to the fitter, fail to correctly ventilate glass fibre and your boat may just hit an ice berg Also Glass fibre needs a parapet with zinc or plaster or cedar or something on it because I could think of nothing worse than looking at glass fibre every morning. Out of general curiosity what kind of guarantees are going with glass fibre roofs anyone know??
Well one that I know of has a 20 or 25 year material guarantee, and is Agrément Bord Approved.Ode To The Motorist
“And my existence, while grotesque and incomprehensible to you, generates funds to the exchequer. You don't want to acknowledge that as truth because, deep down in places you don't talk about at the Green Party, you want me on that road, you need me on that road. We use words like freedom, enjoyment, sport and community. We use these words as the backbone of a life spent instilling those values in our families and loved ones. You use them as a punch line. I have neither the time nor the inclination to explain myself to a man who rises and sleeps under the tax revenue and the very freedom to spend it that I provide, and then questions the manner in which I provide it. I would rather you just said "thank you" and went on your way. Otherwise I suggest you pick up a bus pass and get the ********* ********* off the road”
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