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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...

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...

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...