trying my best
Junior Member
- Joined
- Apr 30, 2009
- Messages
- 11
- Reaction score
- 0
Afternoon all! Situation is old sloping tiled roof above ongoing loft conversion. 50mm air gap to be maintained under tiles between rafters then 80mm of solid foam type Kingspan insulation between rafters, then Thinsulex multi-foil insulation across underside of rafters at right angle followed by 25mm battens nailed under this to take plasterboards. Depth of rafers means that apart from the 50mm undertile gap all the space is taken up by insulation.
Yes I know regards derating the 2.5mm T&E that I'll be using for downlighting but would prefer not to run through all this insulation so was wondering about something like using small trunking without the capping on, open side up with just the odd short piece of cpping to retain the cable in the trunkingfixed to rafters where necessary just below the 50mm air gap and cutting a rebate in the Kingsmill to fit up to this. This would mean the cable was not in insulation and it would be possible to rewire in future without too much hassle. It would also mean that the Kingsmill would only loose a 25mm x 25mm channel down one side to accommodate the trunking.
Or even better, your suggestions.
Also trying to make my mind up as to wether to run underfloor cables beneath the chicken wire and fibreglass loose on the ceiling below or clip to joists, 50mm + down, above the insulation? But again has implication if rewiring.
Just want to here any good practical best practice ways etc. Thanks for any inputs, back soon.
Yes I know regards derating the 2.5mm T&E that I'll be using for downlighting but would prefer not to run through all this insulation so was wondering about something like using small trunking without the capping on, open side up with just the odd short piece of cpping to retain the cable in the trunkingfixed to rafters where necessary just below the 50mm air gap and cutting a rebate in the Kingsmill to fit up to this. This would mean the cable was not in insulation and it would be possible to rewire in future without too much hassle. It would also mean that the Kingsmill would only loose a 25mm x 25mm channel down one side to accommodate the trunking.
Or even better, your suggestions.
Also trying to make my mind up as to wether to run underfloor cables beneath the chicken wire and fibreglass loose on the ceiling below or clip to joists, 50mm + down, above the insulation? But again has implication if rewiring.
Just want to here any good practical best practice ways etc. Thanks for any inputs, back soon.