ceiling board over insulation

S

sammoseley

hi
need to insulate garage ceiling with 50 mill celotex and board over, would you normally
fix celotex to joists ( needs to be under joists as loft insulation in between) then screw boards through to joists presumably needing 70mm or longer screws or is there an easier way? not sure if boards can be screwed into just the insulation..
also an air gap would be a bonus so same question applies

cheers as always
Sam
 
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