Cavity Wall Insulation

2 Mar 2009
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United Kingdom
I have obtained a couple of quotes for cavity wall insulation. One installer uses the product InstaFibre White Wool from InstaGroup.

Would appreciate any comments from anybody who has had experience of this product.

Also, I was advised by the surveyor that because they cannot have access to the upper half of the side walls of the house, they will have to inject the material from inside the house in the loft area. Is it safe to drill holes in walls from the inside of the house and and then fill the holes with the with the insulation material?
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The best form of insulation is urethane, but it does come with one draw-back in that after initial injection and during curing the material gives of a certain amount of fumes - if you imagine someone using airfix glue on a big scale thats the sort of smell you will get - and it is advised to have plenty of ventilation e.g. open windows/doors to disperse the fumes, for this reason alone it is best to have a urethane systems installed during the summer months when the weather is a bit kinder.

The benefits of urethane are that it is waterproof and vapour proof thereby providing an effective barrier to both penetrating rainwater which may affect some of the other insulation materials and being vapour resistant you will not suffer problems associated with thermal bridging and condensation.

The proposed method of installation is ok, if some of the guys doing the installing could get away with it they would probably love to do all the installation from the inside of the house as it would save them quite a bit of time by being able to run around the house rather than have to climb up and down a scaffold, only problem is would you want to go around after them making good to all the damaged walls!


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