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No the new extension has a cavity, the existing structure (brick wall) doesn't. I meant the brick wall previously, sorry if it was confusing. The extension (that starts at the point of the render as seen in the photo) is a wall made of two leafs of blockwork with a cavity, and K-rend render...

Maybe I don't fully understand what you propose. The water will come through, yes, the same way as it comes now presumably, but how will we be able to tell what's at fault. Filling the pipe with a hose is similar to water coming down during/after heavy rainfall (there's about 45sqm of roof...

Divergence of opinions here :) There isn't any localised stain on the outside at the point of the connection (end of the pipe), but there are signs of water travel in all directions downwards. It could be that the leak is further upstream. A crack in the pipe perhaps? although from the photo I...

Thanks but the problem is that there's no immediate feedback because the water travels slowly inside the wall and eventually shows on the inside much later. The leak is likely small because even during heavy rain there's no noticeable immediate change in the wall.

We built an extension on ground floor of a Victorian house. The extension is L shaped with a thin part connecting it to the existing structure. The roof is a green sedum roof, with a waterproofing membrane collecting all the rain water and channeling it to a pipe that goes through the ceiling...

Hah, yes, I'm sure damp problems will disappear after we leave the EU :)

Should I also invite the tax officer to inspect my bank account just in case, and my wife to check my web browser history? :whistle: Before I do that I want to weigh the certainty of extra cost and inconvenience in the short term (extra rent for the additional waiting time and emotional cost...

Yes, true. :-/

I'm answering my own question. From Ecotherm's FAQ: Can you full fill a wall cavity with PIR board? PIR board is not designed for a full fill cavity and typically requires a minimum 25mm cavity from the external brick / block course to prevent moisture transference. Now, how strict is this...

Indeed. This is why I'm trying to form an independent opinion. Very true, and there are points that it's <25mm especially where there's some excess mortar from the block building (forming a bridge between the insulation boards and the outer block leaf). The question is what to do now. One...

The drawings had (starting from inside and going out): - inner block 140mm - insulation boards 60mm - empty cavity 50mm - stone cladding 75mm We had a hard time arranging the stone and we decided to switch to block and render instead, block 100mm and render 25mm. The builder aligned the block...

85mm cavity with 60mm insulation leaving only 25mm air.

Location is London, so exposure zone 1. It's not too close to neighbouring walls, these are about 1.5m and 3m on two sides and ~30m on one side (backing into a garden). Drawings had 50mm cavity with 75mm outer wall which was meant to be stone cladding. Then we changed it to block plus render...

Hello, I'm having an extension built. The wall is made up of an inner block leaf, an insulation layer (60mm ecotherm), a cavity, and an outer block leaf, with 25mm of external render on top. The cavity was supposed to be 50mm wide but the builder made it narrower (approx 25mm). He insists that...

After reading some more, it seems that people in general recommend foam underlays, as long as they are dense enough. With that in mind I'm leaning towards the Tredaire Sensation, that at 145kg/m3 is significantly more dense than the Dreamwalk for example (110kg/m3), and still very cheap (half...

But does the underlay have to only match the life of the carpet? What if it lasts the lifetime of two carpets? If I have to change carpets every ten years for example, and with standard underlay I would change that at the same time, but axfelt can last for twenty years so that I replace it the...

My budget could accommodate the Axfelt, so I would get it if it's worth it. When you say it's over the top compared to the carpet, does that mean it's overkill? If the carpet lasts 5-10 years with the other, inferior underlays, under very heavy wear (so presumably more with normal wear), does...

what did you end up deciding in the end?

Hello, We are refurbishing our flat and need carpets for four bedrooms and a corridor, all on the same level, (60sqm net total area, about 75sqm if you take rectangles surrounding all rooms, about 85 sqm if you account for wastage based on carpet roll width of 4 or 5m). Before we started...