i have a flat roof with 8" joists that i want to re-insulate with Kingspan 'slab' insulation
Will 100mm be sufficient? and should i leave the remaining 4" gap above the insulation for ventilation?
How much gap should i leave for the electric cables that run through the joists and how much free space should downlights have?
Thanks
Will 100mm be sufficient? and should i leave the remaining 4" gap above the insulation for ventilation?
How much gap should i leave for the electric cables that run through the joists and how much free space should downlights have?
Thanks