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Hi I recently emptied my radiators to move one. Once I filled them up I noticed the hot water from the taps goes hot and then mild and hot again, etc. This would imply there is an airlock somewhere. What I don't understand is how an airlock is in the hot water pipes from emptying the...

Could someone confirm if a gap is required on the wall between kingspan and membrane attached to the wall? So, I'm not asking about best practice but legal requirement. I ask as I have 75mm joist and 75mm kingspan and no gap between membrane on the wall and the kingspan. This is for an...

Sorry - this has probably been asked numerous times, but... Please can someone give me advice and guidance on a wood extensions. I've reviewed the government planning page, but require some further clarification. I want to build a wood extension that is within the rules stated on the...