I'm currently renovating my house. There are small bits I'm doing myself, though not as much as I'd like to and nothing on Mikes scale.
I need to screw some 60mm celotex externally to a timber gable. I need some plastic washers for the screws, is there something specific I should be getting? And is there a rule of thumb for the diameter of the washer for a given thickness of celotex? On this occasion its 60mm.
Cheers
Mark