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I've finished constructing a block wall with a radius on the boundary of my property. I think I may have boobed on my scratch coat with 5:1 sand cement ratio when it should have been 4:1. Can I get away with a 5:1 finish coat or should I weaken it to 6:1? The wall faces roughly west in the SW...

I'm constructing a workshop from dense block and now I have the timber roof on, I want to render the exterior blockwork. Can anyone please advise me of the correct mix ratio's for the 50/50 sand, cement and lime? Also, If I apply a scratch coat and final coat what are their approximate...

The central heating works fine. The domestic hat water does not. The only way to get dhw is to fire up the ch and then turn on a hot tap. I've just replaced the diverter valve according to advise given to me on another boiler forum site but...no joy Supplementry info: 1 - Extractor fan...