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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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Insulating roof between rafters
Well, I'm running a sadistic hardware experiment at the moment, running 2 pcs and an ultrasparc in the loft. Despite my long-standing must-do job of putting insulation in the loft it remains unstarted, so I think now is as good a time as any. (If I have a burst of energy tonight I will probably cave in and bring the poor machines back down into the office). It's a victorian terraced house with standard roof construction (the name escapes me at the moment, but they're not trusses). My plan is to install as thick kingspan or celotex between the rafters as I can get away with, whilst leaving a ventilation gap of 50mm between the insulation and the sarking/tiles. At the apex I will sacrifice a little headroom and fix some insulation horizontally so that there is a ventilation route connecting both sides and all gaps betwen the rafters. At the edges I'll leave a small gap & install vertical insulation so that there is no airgap underneath & into the loft, but ventilation is maintained from any gaps in the soffits up to the rafter ventilation space. Everything will be sealed as far as is possible. There are 2 air vents per roof face, about 1m from the apex. Does anyone see any fault with this plan, and do I need to install any additional vents (if so, how - I really don't fancy climbing on the roof)? -- Richard Sampson email me at richard at olifant d-ot co do-t uk |
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