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Hopefully this is a quick one for the experts out there. I’m building a garden office. Floor joists are in 145 x 45 and will celotex in between. Noggins every 40cm. On top can I get away with 11mm marine ply or should I really only be thinking about 18mm? Is there really that much difference...

Hello all, Looking for some guidance here. We are having an extension built onto our 1930's house (semi). The new walls are built from block with a 100mm cavity. The cavity is filled with 50mm celotex. Once finished, the exterior walls will be rendered. My question, is it worth insulating...