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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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Cavity insulating stone walls
hi
With all this talk of insulation, is it workable to cavity insulate stone walls with random cavity? I would have thought so, though expect a lot of filing holes would be needed. But I know its advised not to cavity insulate some wall types. NT |
#2
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Cavity insulating stone walls
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#4
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Cavity insulating stone walls
Weatherlawyer wrote:
Phil L wrote: wrote: With all this talk of insulation, is it workable to cavity insulate stone walls with random cavity? I would have thought so, though expect a lot of filing holes would be needed. But I know its advised not to cavity insulate some wall types. definately not. A housing estate was insulated in Scotland (new build) and was later found to have undressed stone on the cavity side....after six months or so all the houses got damp, and I mean seriously damp, fungus growing outof walls, timbers rotting everywhere, the rsidents had to move out while the houses were ripped apart and the insulation removed. The *minimum* cavity size to be filled must be at least 50mm, with undressed stone this is impossible to gauge, some places it might be 75mm and others only 35mm...it just doesn't fill and water ingress is the result. So what you are saying is that all cavity fills are likely to cause problems but that with a wide enough span, most homes get away with it? Most homes have a cavity of 50mm or more, CWI isn't garuanteed under this thickness so no (registered) installer would do it, and certainly not undressed stone....it's possible to get it done as a foreigner, cash only, no garuantee etc, and then twelve months later pay about 5K to have it all removed. Whilst it explains the uselessness of modern cill board sizes, it doesn't alleviate fears of TB resurgence. I get the impression some of us are living in time bombs. Is it really so? No. Almost all CWI installers have insurance backed 25 year garuantees issued by CIGA http://www.ciga.co.uk/ Who are independant of the CWI industry, meaning that even work completed by companies who have long since gone out of buisness is still covered. Any jobs done during the 'cowboy' period during the late seventies will either have been repaired or demolished before now, and it's a requirement during house purchases to provide the garuantee, so it's unlikely many houses are 'timebombs', given that problems will show themselves within weeks or months of CWI installation. Check your brickwork with an hose pipe. If some of the bricks are upside down it will show. Most face bricks are designed to shed water. I doubt it is crucial but in a frost.... (Just thought I'd frighten you while we are telling horror stories. And now children: Good night!) I've made a small jpeg to show what I mean: http://i1.tinypic.com/rvybgy.jpg |
#5
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Cavity insulating stone walls
Phil L wrote: Any jobs done during the 'cowboy' period during the late seventies will either have been repaired or demolished before now, and it's a requirement during house purchases to provide the garuantee, "We've lost it" is usually sufficient ;-) MBQ |
#6
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Cavity insulating stone walls
There are differing build techniques with stone depending on the type
of stone - compare for instance the small slab stones on the Northumberland moors with the great chunks of granite in Aberdeen. In my own cottage - sand stone and whin - the walls are approaching 3 ft thick and consist of outer and inner skins of large stones with lime mortar, and all the rubbish - and that is what it was called - goes into the middle without any mortar. It's a real pain when you are making a hole right through for pipes,etc as the small stones just keep on falling down. Now to insulation - the original stone floors were replaced in the 20's with fully vented wooden floors and the walls were lath and plastered. Unfortunately they hadn't heard of insulation then and all the underfloor ventilation went up to the roof space behind the L & P; result freezing cold rooms permanently. So off with the L & P - restrap, rockwool, membrane, plasterboard; result warm house. That's the way to go but it is possible that may not work for you. Rob |
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