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When you have a Internal wall insulation , why do you need a 25mm gap?

If you have blockwork wall with cladding like below. Why do you not need a waterproof membrane in front of the blockwork?

what is the difference between vapour barrier and vapour control layer?

anyone know how to fix aluminium panel to a steel column?

i need to add external render cladding to the outside of my steel column. Can someone please help me with the buildup detail.

For a protected corridor, do you need to put 2 layers of fireline plasterboard on both side of the timber wall? Or can you just put 2 layer of fireline plasterboard on the protected corridor side and one layer of normal plasterboard on the other side ?

hi, I was wondering if anyone could help me? The plasterboard will be fixed using the dot and dab method. For internal moisture do i require a vcl barrier? Or does the foil facing insulation within the cavity have a intergated vapor barrier inner face

I have noticed on the internet and in books a cavity wall with double skin blockwork wall doesn’t have cavity trays and weepholes just is rendered. Why is that?

I have blockwork cavity wall with timber cladding does it require breathable membrane as block has high water absorption and is porous. Which I highlighted in yellow

I was wondering if anyone could help me ? I have a car port and a porch which leads to the main door would the carport require a fire door to be put in to stop fire spreading? onto the porch and to front door. Does carport roof require any insulation this for building regulation drawings...