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Posted By: gravelldBuilders should be engineers really, involved in the appliance of scientific research into building healthy, safe, sustainable dwellings.
Posted By: gyrogearpart of said operations involving sticking their self-identifying bar-code stickers onto each part of structure that they touch...so that site inspections would identify who did what...
Posted By: mike7Yes, it's Knauf dritherm earthwool, 75mm thick nominally, in a 100mm cavity. so presumably this is intended to be a 'partial fill cavity' , described as one option on the packaging
Posted By: djhPosted By: mike7Yes, it's Knauf dritherm earthwool, 75mm thick nominally, in a 100mm cavity. so presumably this is intended to be a 'partial fill cavity' , described as one option on the packagingHmm, I'm surprised to learn that it's approved for partial fill. I wouldn't have thought that it has sufficient stiffness to leave a clear cavity. I see that the BBA cert http://www.knaufinsulation.co.uk/sites/knaufuk/files/downloadfile/dritherm_bba_certificate.pdf lists certain specific retaining clips for use in partial fill applications. I wonder if they have been used?Knock the wall down and start again would seem to be the sensible option.
Posted By: MarkyPI've used dritherm - good stuff. I think the oversizing of the cavity is to allow for the insulation to expand. I've used dri-therm 32 and it does expand once unpacked a good way beyond it's stated thickness. You'd easily fully fill a 140 -150mm cavity with 125mm thick insulation. I think brickies that have used it before tend to oversize to allow for this, fitting it into a cavity of similar size to the stated thicknes and the expansion combined with inevtiable mortar snots tends to push out the brick/blockwork and they stuggle to keep the wall flat.this stuff can be really tightly butted and knits together well. There's really no excuse for those gaps. Even if the ties arent falling quite right you can make a small slit cut in the batt to allow it fit down over the tie to sit tightly on the batt below it.
Posted By: tonycost :) fibreglass is cheapest bang for your buck in terms of u value. also no possibility of thermal bypass. bricks and blocks work out cheaper than other methods too.Mine is pretty much a solid wall with 300mm EWI and a brick rain screen, I used high lime mortar so no damp or wet problems.
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