Im a if the house has cavity walls they are their for a reason The amount of houses that have the air ventilation bricks filled with silicon and then suffer with damp is quite astonishing.
I'm building my house with cavity walls made of CMU as the interior masonry wythe and bricks as the exterior masonry wythe, and I'm considering doing a hybrid insulation with 4in of open cell foam on the interior face of the exterior masonry wythe (for its air barrier / thermal + acoustic properties) and 4in of Rockwool on the exterior face of the interior masonry wythe (mainly for its acoustic properties). In 20 or 25 years' time will I be able to remove the foam without damaging the mineral wool? Or will I need to remove both? At that point in time how exactly will I install the new hybrid insulation? If that proves impossible I will consider using only open cell foam...
what a con, I bet most of the companies who are removing it were putting it on 15 years ago. Both at the cost to the tax payer. It's as big a con as the rising damp industry
Nice work, if you have a nice brick house that does feel warm all the year round, just need heating on sometimes during winter season, is it worth having it done with that render over brick work and insulation inside as you are doing it? It looks a nice finish. Reason I'm asking; a company here in UK already have done insulation under my lovely wooden floor. But, they said as you do. You will not see the difference when done. But they have spoiled my floor. They used the wrong nails on my floorboards. The other part of the contract is rendering outside and putting insulation, you have done a great job but I'm not sure I should go ahead after them spoiling my floor. They sent an expert floor fitter. afterwards to inspect the work. He agreed they have done poor workmanship. But said it would not be possible to match the floor boards with replacement wood. Also it would cause further damage removing the nails. He said his preference is oak rather than pine. But, they didn't agree to do anything about it. There are gaps, holes, and big nail heads showing. I took before and after pictures. It's spoiled my living room.
@@krakatoa16 Surprisingly it's colder. It used to be much warmer this time of year. But before there were no gaps in the floor. A professional joiner came to take a look. He said the work was unprofessional. That the wrong nails had been used. There are big gaps which are not possible to fill. Plus even if I was to get reclaimed wood to replace those floorboards. They would not match. He said there was only two options: if I want to have wooden floor. Replace the entire floor or cover with engineered wood. I showed him the pictures taken of the floorboards before they did the work. That was when he confirmed it was not a professional job. But company that hired the the contactors that did the work has not since replied. I didn't see the work being done. I was in the kitchen and the workers had blocked the door. I could only get out into the back garden. I could hear them swearing and cursing every time they made a mistake. When the workers showed a few pictures of under my floor. There were none showing the underlay insulation. They said they put it in after taking the final pictures. They also broke my slat curtains. That were £40 to replace.
No it's not. If you have CWI like mine that's over thirty years old and has been damaged by water ( toilet overflow pipe dribbling water into cavity ) then yes, you have to have it removed because it will cause mould and damp which I have. Then after it has been cleaned out and dried for a certain amount of time, then install new insulation. I haven't had any problem with the CWI, only that it's old and probably sagged and the recent flood damage.
@@jooie444 the cavity has been designed to be damp and moist, the separation of the two walls keeps it ventilated and allows any moisture to dry out while also stopping it from reaching the internal wall causing damp and moisture internally. You shouldn't fully fill the cavity.
@@jhutfre4855 well, the brittish regulations allow rockwool insulation to fill the entire cavity (100mm) but celotex should only fill half the cavity (50mm void and 50mm celotex against the internal wall). Celotex insulation is also about twice as effective as rockwool. In the UK the government gave grants for people to fill their cavities with the insulation shown in the video but it created major damp issues as it allowed the water to breach and flood the cavity and they were then sued and made to remove the insulation.
