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Only single layer of brick and plasterboard. Been up number of years and now the single level extension with a flat roof is cracking (through/around) the bricks. Should I use a concrete lintel with metal in it, more than 1, or a metal lintel or a RSJ cut down? Should I opt for...

Which is the better method for quality and longevity? Thanks :) Will I only need one proper layer for the torch option?

What Polystyrene brands are there? Thanks I forgot what the handyman said.

Something to do with windows I think.

PIR e.g. Celotex or Kingspan. Is Rockwall preferred over PIR panels like Celotex? Based on the thickness required and it seems 65mm of rockwool isn´t thick enough to insulate sufficiently, what mm of Celotex / Kingspan / Xtratherm is required? I´ve heard 40mm is thick enough (according to...