When they do cavity wall insulation, do they always drill about 30 holes in the side of the house? I've never had it done myself as this house already had it, but my neighbour (2 storey semi-detached house) had it done recently and I thought they just drilled one big hole where they pumped it in. The council are doing all the flats (2 stories only) near here and they drilled about 30 1 to 2 inch holes all over the wall aswell. Even if they fill them in, they're obviously going to be noticeable.
Another question - with a semi-detached, do you share a cavity? If so how does only one owner get cavity wall insulation?
My house has harled walls, so when each hole was filled with a small amount of cement, the guys plucked ten or so wee stones off the currounding area and pushed them into the visible cement. The result is that the holes are quite hard to spot. Maybe council workers wouldn't do that though.
"Do I need to be at home for the installation? Yes. Our installers need to check your gas appliances and make sure your= walls are clear before they start installing cavity wall insulation."
Gas?
"My house is semi detached / terraced, will the cavity wall material go = into my neighbour=E2=80=99s walls? No =E2=80=93 if the neighbour=E2=80=99s house is already insulated then = our material will stop where it meets theirs. If it is not already insul= ated, our installers will fit a cavity barrier at the party wall line, u= sually made from bristle brush. This will prevent any trespass of materi= al."
Trespass of material indeed, surely a neighbour wouldn't complain about = free insulation?
"How long does cavity wall insulation last? For the lifetime of the building."
Which surprises me. I would have thought they were all done by now, yet= the council is going round all the flats (2 storey) here doing it. Whe= n I asked one of the tenants, she said she thought they were redoing it = as it had crumbled away.
"Will my gas appliances be safe after installing cavity wall insulation?=
Yes. Our installers will carry out gas spillage tests on your gas applia= nces both before and after the installation, to make sure that they are = working efficiently and safely. If there are any problems with ventilati= on, they will advise you. If your appliance is over 7kw, you will requir= e a Combustion Vent to be fitted in your wall to allow sufficient ventil= ation. Our surveyor will advise you of this."
How on earth can a cavity fill affect gas ventilation?
-- =
People are more violently opposed to fur than leather because it's safer= to harass rich women than motorcycle gangs.
If I go in my loft, I can see the foam protruding from the top of the walls, so I always assumed they just pumped it in and the air was pushed out into the loft. So why the holes?
Because an air-brick vent through the whole wall providing necessary fresh air in a room with an open fire might be broken. And then it might get filled up by the insulation, blocking the supply of fresh air.
The installers who did my house replaced one air brick specifically for this reason, though not in a room with a fire in it - just so the room vent still worked.
Please Sir. Please Sir I know what it is too.... Here it is called Roughcasting. Typically done by Plasterers or Roofers/Slaters. AND there are two local types- WET casting, where a slurry of cement and stones is flicked at the wall, every man has his own mix and wrist action. Difficult to learn. and DRY casting, where a just rendered wall has dry stones flicked at it. Much easier to learn. OlavM Overlooking the Clyde where it meets the Sea
And, you're not gonna know *where* to drill them. When done on the outside, they drill the mortar at the intersection of three bricks. That way, they know they're not gonna hit a tie.
I didn't realise it was Scottish. My mother and father call it that and she's from Yorkshire and he's from London. Also, the people who didn't know what I meant were Scottish.
I see, that's not going to be on most houses, and they'll know if there is one. So quite why everyone has to be in I don't know. Maybe it's for the vent ones which need inside access.
So why do they drill so many, is it just to let the air out as the gunge goes in, or do they poke it in them all. Seems to me that drilling so many holes would weaken any dodgy bricks in the outer wall. Also if all they do is skim them before decorating the building does this not leave a lot of places where damp could get in some years down the road? I live in a single walled house. Maybe I need to build a house around the outside so I can have it fitted!
In my case the air could have just floated into the loft. Aren't all cavities open at the top?
I think you can add bricks round the outside. Definitely insulation. But I don't think any of it is worth the effort and cost just to save a tiny amount of gas. The only insulatipon I ever did was double glazing, and that was for noise abation, not insulation.
Just had mine done and yes they pump the liquid into every hole, they do it in layers up the wall to ensure a complete fill. Once filled with coloured mortar the holes hardly show.
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