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The question: Is bolting 2 - 9x3 beams togther with dog tooth plates and bolts the same strength as bolting 3 - 9x2 beams togther with dog tooth plates and bolts ? On paper, the 9x2 is better grade timber because is rated at C16 So that will make it slightly stronger. 9x3 tends to be a little...

Would using 9" hollow blocks be okay for a small single-storey extension? The outside is getting covered with XPS insulation and plastered. So the old drawback of cold\damp bridging that hollows are known for will be gone?

Borrowed image.. The roof is planned to be a pitched gable side to side. Parapets are need because we are building right on the boundary. What's the best way to sit the roof ? Straps ? A beam bolted to the wall ?

Is it okay to extend a hip by extending the jack rafters up onto the new ridge board or Should the jack rafters above the hip board be removed back to the full common rafter and then replace them with full common rafters tied back the the lower jack rafters ? From this photo (purely...

Can anyone recommend a good brand of plate plate solar panel for a self install? Something made in Germany/Austria that is not re-badged junk from China !

I have a Thermostatic valve directly off the top of the cylinder. I get the impression that the hot standing water is leaking heat back up the cold feed pipe. Would a NRV or loop be advisable or is that standard for that type of valve? And of course the valve could be faulty

I just got a boiler stove put in and it has boiled the water a few times in the last few mornings that I lit it. water has come out the expansion tank overflow. Any suppestions to what I could check? All valves are open and it is an 'open system' like it should be. Pipe stat is set to...