How do you fix battening over 100mm thick PIR insulation.
I need to go into standard brick work (an old chimney breast).
My thoughts are to 'glue' the PIR (foil backed both sides) to the brick work with expanding foam, then fix 25x50mm battening with some sort of long fixing that goes through the PIR and into the brick work.
Insofast do something that doesn't require battening, but it seems an expensive way to put up plaster boards, £15 + delivery for just 20 fixings. plaster board screws are recommended every 150mm, so you'd get through quite a few of these.
I've thought of using a series of wooden battens on the brick wall, and simply use very long wood screws to go through the 100mm PIR, but that would require 150mm 6 screws - that would probably split the battens.
I need to go into standard brick work (an old chimney breast).
My thoughts are to 'glue' the PIR (foil backed both sides) to the brick work with expanding foam, then fix 25x50mm battening with some sort of long fixing that goes through the PIR and into the brick work.
Insofast do something that doesn't require battening, but it seems an expensive way to put up plaster boards, £15 + delivery for just 20 fixings. plaster board screws are recommended every 150mm, so you'd get through quite a few of these.
I've thought of using a series of wooden battens on the brick wall, and simply use very long wood screws to go through the 100mm PIR, but that would require 150mm 6 screws - that would probably split the battens.