I can't see how you'd ever get a block in. It only looks like a 20mm deep recess to me.
In the back like this more modern one:
That's my thinking too - and the thermal bridging seems much worse, not to mentioning hitting steel when you want to put up a curtain pole.
What kind of lintel is this? If you look closely, it's not possible to set a block in at the back, and yet it appears to be a cavity lintel.
450mm is a popular choice. Enough room for 2 courses of blocks inner, and 6 of bricks on the outer skin.
100mm hardcore, 50mm blind but in reality it's 35 to 50 depending due to slight undulations on the hardcore.
You may be right but I was asked to include one in an extension 8 years ago so have been doing it ever since. Note that this is a 'insulation...
I'm pouring a 100mm slab that's 4.7M by 5.0M. The slab is on 100mm PIR insulation. My spec has A142 mesh, but I've found that I've only order two...
2 inch wide braces for me too.
Thanks for the tip. I'm going to hold off weighing in my three buckets of scrap for a while.
Oh blimey I hadn't seen those.
The eaves tiles look beautifully saggy too.
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