Just looking at cost of insulated plasterboard, surprised in the cost difference. Guess there is a time saving though on a ceiling it may make it more difficult.
120mm celotex in between 200mm rafters on low pitch vaulted ceiling. Choice is either 37.5mm insulated PB over top (25mm insulation) or 25mm cross batten the rafters and fit 25mm celotex between, tape over battens to celotex making the foil of the celotex the VCL (or staple a plastic sheet over everything) Doesn't totally eliminate cold bridging but it's a very viable option.
Heard it said the battering method can reduce later movement cracks in the plasterboard although whether it's true I don't know.
Best I've seen 37.5mm insulated PB sheet is £31.50 (inc vat). Insulation on it's own £11.99 (25mm) a sheet of pb 12 or 9mm about £7.50 + battens probably £2 worth a sheet? so £21.49 plus the foil tape probably adds £1 or plastic sheeting. So at worst a £9 difference, on a 34m2 ceiling it's £300.
What do you guys choose in these instances and for which reasons?
Thanks
120mm celotex in between 200mm rafters on low pitch vaulted ceiling. Choice is either 37.5mm insulated PB over top (25mm insulation) or 25mm cross batten the rafters and fit 25mm celotex between, tape over battens to celotex making the foil of the celotex the VCL (or staple a plastic sheet over everything) Doesn't totally eliminate cold bridging but it's a very viable option.
Heard it said the battering method can reduce later movement cracks in the plasterboard although whether it's true I don't know.
Best I've seen 37.5mm insulated PB sheet is £31.50 (inc vat). Insulation on it's own £11.99 (25mm) a sheet of pb 12 or 9mm about £7.50 + battens probably £2 worth a sheet? so £21.49 plus the foil tape probably adds £1 or plastic sheeting. So at worst a £9 difference, on a 34m2 ceiling it's £300.
What do you guys choose in these instances and for which reasons?
Thanks