what you mean 2 skins with no cavity?0 is the minimum.
Really daft question so sorry about this, I bought some knauf cavity slabs 100mm, you can compress it easy so I can get it into a 50mm cavity, is that ok to do that? I mean compress to fir in a smaller cavity as to what its says which is for a 100mm cavity?thanks mate good to know, gonna do a 50mm cavity its a small room already and trying to claw some space inside.
You will actually increase the density by compressing the insulation and reduce the thermal performance. 50mm thick insulation will be more efficient.Really daft question so sorry about this, I bought some knauf cavity slabs 100mm, you can compress it easy so I can get it into a 50mm cavity, is that ok to do that? I mean compress to fir in a smaller cavity as to what its says which is for a 100mm cavity?
Just means more compressed.
Great thanks 50mm into 50mm.You will actually increase the density by compressing the insulation and reduce the thermal performance. 50mm thick insulation will be more efficient.
No matter how you try and achieve the thermal resistance with masonry, it all ends up being around 300mm thick in any case.thanks mate good to know, gonna do a 50mm cavity its a small room already and trying to claw some space inside.
With such a small extension 8x8feet(?) I would be OK with accepting 50mm, possibly with an increase in insulation in the roof and/or floor as a trade off if practical or even topping up the existing roof. You can do an average U value calc but for such a small extension it doesn't really warrant it, but this would need to confirmed with building control.No matter how you try and achieve the thermal resistance with masonry, it all ends up being around 300mm thick in any case.
Your only hope of gaining extra space via the solid masonry route is to involve EWI and render (), if you must. The alternative is fitting insulation (75mm ish) to the interior of the room - doubly horrendous when you consider fixing anything to the walls later on.
Why would a small extension not benefit from the latest Building Regulations? I'm not getting this.. because it's small I can dodge the reg's.. thing?for such a small extension it doesn't really warrant it, but this would need to confirmed with building control.
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