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2 basins back to back, 2 separate bathrooms. studwall between rooms Stack is about 2.5metres away. which would be best and meet building regs? option 1: run 2 separate 40mm pipes to stack. option 2: connect into horizontal soil pipe (Top of soil pipe with a boss) from each sink, about 1m...

Hi Wanting to build a ground floor extension with a gable roof approx 25 degrees joining a hip roof approx 40 degrees . This gable will start at the end of the bungalow and finish about half way along, this part is straight forward was wondering how the valley board and lead from gable roof...