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

Is soild blockwork porous and permeable ?

Stop water penetration? I believe the foil facing insulation will do it that and drained cavity

For water penetration

Why do you not need breathable membrane for blockwork when it is porous?

Why is that? Blockwork is porous

Quick question why are breathable membrane pointless to fix to blockwork ?

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?

What ur suggesting is for facade cladding i dont need all of that for just a column in between sliding doors

I would like to do something like this On the column would you just put timber batten and insulation,sheathing board and then the plastic or aluminium board

Without cold bridging

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.

Is just 1or 2 layers either side?

Can i have fire line plasterboard on the protected side and standard plasterboard on the other side ?

No. An protected hallway for mean of escape

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 ?

How do you stop internal water vapour damaging the permeable blockwork?