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Hi. Thank you for the reply. Every where I read talks about using these fix for insulation or insulation with 6mm ply already bonded on the insulation. Can these be used when the is 18mm ply on top of the insulation? Would they require a poilt hole? Would the dome head show through the EPDM...

Hi. Please could someone please provide some advice on new flat roof fixing. I am current building an extension with a flat roof. The roof will be of the following make up. 175mm roof joists. Timber firrings 18mm ply deck VCL 125 celotex insulation 18mm ply top EPDM membrane The...