A standard board with a coat of SBR is more waterproof. Water resistant is a way to make people pay more. If they get damp they snap over you back when you pick them up same as standard board.
Don't use mastercrete for external render. A builder I worked for used to get it and had similar problems. It would rub up mint then next day little cracks would appear, drove me nuts. After trying allsorts went to ordinary portland cement and everything went back to normal. Whatever additives...
I had the same thing on a couple of extentions I did. After talking to my chippie mate he told me it's down to building regs. The hip bearer has to be the same dimensions as the roof joist so you end up with that low corner. I ended up packing down the joists with strips of plasterboard to get...
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