The floor joists in the attic are about 100mm in height, i need to put down 270mm of insulation, whats the safest way of increasing the height of the joists
loft insultation
- Thread starter nobbysnuts
- Start date
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Install 100mm insulation
Then fit 170mm timbers running at right angles to the existing joist.
Then fill the new void between timbers.
Then fit 170mm timbers running at right angles to the existing joist.
Then fill the new void between timbers.
Why do you need to, are you intending to board over?
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J
joinerjohn
Builder Centre have a special offer on DIY loft insulation at the moment.
170mm rolls for only £3 per roll. Time to double up on loft insulation.
170mm rolls for only £3 per roll. Time to double up on loft insulation.
the floors not boarded as yet thats the issue with joists that are only about 100mm high and insulation that needs to be 270mm, what want to do is increase the joist hight put down the insulation and then board the attic floor to use it as storage space
Follow my instruction then, put 170mm deep timbers at right angles to the existing joist and fill in the voids with insulation.
Must add, that you need to be careful when electric cables are run through thermal insulation, as this will effect the safe current capacity the cable can carry can carry, this is mostly an issue with socket circuits. Lighting circuits that are protected by 5/6 amp fuse/breaker are normally okay.
So if you do have any electric cables in the loft insulation, it could well need to be moved to a safe location or upgraded.
If you can tell me what you have, cable size, circuit type and fuse/breaker size can offer better advice.
Must add, that you need to be careful when electric cables are run through thermal insulation, as this will effect the safe current capacity the cable can carry can carry, this is mostly an issue with socket circuits. Lighting circuits that are protected by 5/6 amp fuse/breaker are normally okay.
So if you do have any electric cables in the loft insulation, it could well need to be moved to a safe location or upgraded.
If you can tell me what you have, cable size, circuit type and fuse/breaker size can offer better advice.
Always dangerous to assume anything
Just checking you were going to board the loft; go with PBD method
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