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Thank you John. That was how i was seeing it, hence posing the question. So in principle, if the 40mm were full, then a 50 won't be (at least initially), hence going up a size for the vertical bit would suffice. That could work for me. (Old&Bold, your humour is one step beyond my ability to...

Part H table 2 & diag 3. Gradient limits for unvented branch pipes. I understand the reason to put a maximum gradient on - to avoid unsealing traps. (eg washbaisin on 40mm can achieve maximum of 3M on 18mm/M) Is is correct to assume that if the pipe must turn completely vertical for part of a...

So my first excavation at the trap. Solid concrete, hard going (no screed). ~12 cM, then sub-base hardcore below. No DPC at all. The (all falling off) internal Marley tile appears to be the only form of DPC in this case.

No- space is really really tight ! Think I'll go with a liquid then. Thanks.

I'm aware of pumps, but trying to avoid them. Also no space at all. A liquid DPM wouldn't physically connect to the polythene though would it, or is overlap and pressure regarded as adequate?

LOL. - But on your second point, I get that air won't bridge a DPC, only something needs to fill it in.

I'll be building a ground floor shower room. It won't be a wet room, but the tray will be directly on the floor. (Concrete, early 1970's, no insulation) The 90mm wide shower trap has pipe invert at about 70mm. Allowing 18mm/M fall, I'll need to dig down to ~ 110mm below ex floor at the point...

Well it was a job I said I'd do if the rot were only on the surface. Rgds

Hi Ree. I respect your answer, so don't get me wrong. Only I wouldn't be here if I just "used a builder" every time. (And I have had experience of some shocking builders as well as some good ones). So to replace the entire lintel (which I won't take on myself)..not just the outer rotten...

That looks like a massively inefficient set up, even if it didn't smoke you out in the process. Probably would burn a lot of wood and you'd still need radiators. And when you are not burning it, heat from the room goes straight up the chimney. Open fires are not the stuff of the 21's century...

Edwardian house solid brick. I am looking for minimum disruption fix here. Ex. timber lintel (softwood) ~65 x ~200 section has rotted in outer exposed half above two 500mm wide windows. Inner 100mm of lintel after I dig in is solid. (See pics, clicky magnify). Interior of property is smart...

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