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Sounds like a silly question, but what's the best way of connecting 40mm waste pipe to a 110mm knockout on a bottle gully. Knockout seems a little shallow for something like this https://www.screwfix.com/p/mcalpine-drain-connector-110mm/ Is that the best method?

My parents have had a porch built with a flat roof cut into the existing pitched roof. The walls are damp externally so I took a quick look at the roof and thought it looked rough. The dampest part is to the left of the front door. The builder has come back and squeezed a tube of silicone in...