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Hi got Concrete blockwork below ground around 70cm deep Supporting a timber outbuilding I’m making in the garden. It’s letting water in, external stuff is not working, my french drain is pants, dpm has clearly failed. With neighbours garden walls so close and timber structure already built...

Oh again re vapour, I will have an inner and outer door. I will have a 1” gap between the two which I will not seal across the threshold or between the architraves so hopefully this would be one way for moisture to evaporate from the void between the walls. This will be at the front and rear of...

It’s based on the building shown in this YouTube vid. Perhaps will be more clear than my description

Hi thanks for replying. Re vapour control, I will have mechanical ventilation from the inside to outside but nothing from the space between the walls. I can’t have any openings in the outer skin other than doors for sound insulation and the two vents to the inner room. re Rockwool, the mineral...

Hi folks, inexperienced builder doing a garden studio for music purposes. Making a 6 by 4.5m studio in a limited space in my garden. I based the design on a tried and tested timber frame twin stud with Rockwool and double layer of plasterboard on the interior with green glue between the boards...