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Hi I wondered if somebody could help me I need to concrete my back yard it is 440cm in length 295 width and it slopes down to 25cm at the bottom my question is how thick should the concrete be by the back door and how much sand cement etc would I need Cheers Kev

Hi wondering if anyone could help me i have bought an old B&B which has a comercial fire alarm system in i want to take one of the smoke detectors out of a small bedroom and leave all the others working and turn it into a wet room it seems to have two cables coming in each with a red and black...