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new workshop - insulation advice needed

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Bluechip:
I suggest you are very careful re: cavity wall insulation.

One of my acquaintances has serious damp problems in a house that had none before.

He had it done 'cos it was   'free'.

The cost of remedial works is currently £18K +

No-one is interested in holding their hands up naturally ...  :bang:

So, if some Gubberment agency recommends it, remember that's what they did with diesel cars too ....  :thumbup:

This ... just one of many sites documenting the failure.



http://www.askjeff.co.uk/cavity-wall-fill/

awemawson:

--- Quote from: David Jupp on April 26, 2017, 03:00:00 AM ---Maybe think what might happen in a fire situation.  Personally I'd try to sty clear of Polystyrene.  Other materials better in terms of fumes/smoke evolution and resistance to fire spread.

--- End quote ---

David, I agree entirely that polystyrene is nasty stuff in a fire - not only toxic flumes, but it drips burning globules that cling to clothing. I did however choose to use it under my workshop floor - great 100 mm thick slabs of the stuff - but as it's covered in 6" of concrete I don't envisage many problems, even in a very intense fire  :ddb:

hermetic:
 There is an easy solution to the fire problem, try not to set fire to your workshop :D, and have plenty of extingishers and hosepipes to hand whenever you are doing anything iffy! Kingspan is good, but not fireproof, though it is under normal circumstances, self extinguishing, but not 4 times as good as polystyrene, and VERY expensive. The purpose of all insulation is to trap a layer of air to prevent heat escaping by conduction and convection. Kingspan gets a lot of its "extra" rating from having the reflective foil on it, which only prevents radiated heat escaping, and most buildings have very little true radiated heat in them. Believe me, by the time the fire gets to the polystyrene, I will be long gone and in the next county! The polystyrene in my forge and welding area will be behind plasterboard and skim, which is rated as 30 min fire delay. I have however taken the precaution of removing all the wiring from the insulated roof space. There are many hundreds of thousands of buildings insulated with polystyrene, and the incidence of  fires has never been lower, except of course unless you happen to own a recycling yard full of materials you can't sell. Chi-CHING!

picclock:
@vintageandclassicrepairs
The exterior walls are solid concrete blocks - no cavities. My current thinking is 12mm osb with 30 or 40mm celotex on 50mm battens which will leave a small air gap behind, supposedly for a vapor barrier - which I don't understand. :scratch:

Not sure what to do about the floor which is a concrete slab. Because the building has been extended the slab has been cast in two parts. Looking at the planning permission info this was done in around 1986, so I,m not sure if planning regs. stipulated foam under the concrete back then for insulation. On the plus side there appears to be no damp at all so it likely works however it was done. Initial thoughts are to just paint the floor with garage floor paint then cover with lino - as I currently have. Any other ideas most welcome.

Best Regards

picclock

chipenter:
10mm foam interlocking tiles at work areas work realy well , both for comfort and temperature .

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