Wow! For one day's work and £100? of materials
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10 years ago
Cavity wall insulation
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10 years ago
I didnt realise you lived in a mansion.
NT
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10 years ago
Does sound very expensive. Our neighbours had this done a while ago and it was nowhere near that sort of loot...
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10 years ago
I don't think you even know what the term means.
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10 years ago
You know you can hire the machine and DIY for much less?
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10 years ago
/ You know you can hire the machine and DIY for much less?/q
For foam?
Jim K
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10 years ago
/ You know you can hire the machine and DIY for much less?/q
For foam?
Jim K
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10 years ago
I just used an old hoover (with polystyrene bead).
NT
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10 years ago
Not quite, but it is a largish 4 bed house plus 4 room annex.
Mike
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10 years ago
/ You know you can hire the machine and DIY for much less?/q
Indeed, I didn't know hire kit was available for injecting foam. Even if it is the grant will probably outweigh the saving and hassle of DIM.
Mike
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10 years ago
Not when you're being asked to pony up £2484 as per the OP
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10 years ago
Just had a quick look at DIY options.
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Kits are for sale @£560 per kit and a quick calculation suggests I would need at least 3 kits so that's £1680. Then there would be the hire of scaffolding as one wall would be impossible to reach without. Add to that the materials to tube 14 air bricks.
Take into account my time and the risks associated with working at heights, and the fact that I'm not an approved installer so no grant, no guarantee, no certification when I come to sell the house.
£2484 now doesn't sound so bad!Mike
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10 years ago
Polystyrene bead's much cheaper, but has lower insulation due to the air vo ids. I suppose in principle you could mix the 2, inject bead then foam.
Can you not inject from inside? It would avoid a lot of brick damage.
Can you not use foam?. Inject it around, let it set, come back to do the wa ll.
Just a case of comparing costs. Granted work doesnt usually work out cheape r IMLE.
What is there to go wrong later? Guarantees on lots of one product arent wo rth much in practice. If a company has a significant run on them, it closes and restarts.
Why would you need it? Show pics of the work, receipts for the materials, a nd bills before & after.
How long would it take to do the job? I've not done foam cwi.
NT
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10 years ago
Its the air that insulates. the solid bits conduct much better than the air.
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10 years ago
Yep. And the air trapped in foam insulates much better than airgaps between beads, because its not free to move.
NT
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10 years ago
Not as effectively if it's allowed to circulate.
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10 years ago
How is it going to circulate, with close packed beads the gaps are so small you need a lot of pressure to get much flow. In may case there are no air gaps except at the top of the cavity so air flow will be negligible.
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10 years ago
The whole point of putting foamy products in cavities is to reduce the slow airflow, thus much cutting heat loss. Sheet expanded polystyrene insulates better than bead because it has foam where beads leave gaps.
NT
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10 years ago
Air *voids* were previously mentioned...
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10 years ago
Grant now up to £4,900!
Mike