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Thread: Loft insulation and storage

  1. #1
    Regular Member JuzzyD's Avatar
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    Default Loft insulation and storage

    Sorry for the strange topic! We moved in 9 months ago and have decided to redo the loft insulation as there's not much of it and what is there is very old (plus we're freezing in this weather!)

    I'm thinking of putting in the recommended 10-11" which will mean that it would be in two layers - one inbetween the joists and one across the top.

    Whats the best way to provide for storage on top if this? Would we need to build a platform on legs down to the joists? I can't see that we would just lay some boards down on top of the insulation across the joists as this would just crush the insulation?

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    Regular Member blr123's Avatar
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    Best just put the layer in between the joists and floor the rest leaving hatches where there are joit boxes etc

    Bryan

    PS do you have water storage tanks in the loft?

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    Regular Member greeningr's Avatar
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    Funny this topic has come up.

    I'm flooring my loft this weekend.

    Our loft has extra insulation approx 11" so I'm putting additonal rafters on top of the exisiting (running across the existing) and then putting the flooring down.

    You need to have an inch min air gap between the insulation and the flooring to allow the air to circulate.

    Hope this helps

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    Regular Member JCB's Avatar
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    Now then mate -

    On a new build house under current B.Regs, we lay 300mm in total - 100mm between the ceiling joists, and 200mm laid at 90degrees to that...

    Storage is a problem in new house lofts now, especially with that much insluation.

    The only thing I can suggest is that you lay rigid insulation (polystyrene stuff) such as Celotex GA3000 - say 100mm thick between your josts, then you can just lay T&G chipboard on the ceiling joists...

    edit: never squash your fibreglass down - it won't work how it is designed and therfore'll be a waste of money!

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    Regular Member JCB's Avatar
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    Quote Originally Posted by greeningr View Post
    Our loft has extra insulation approx 11" so I'm putting additonal rafters on top of the exisiting (running across the existing) and then putting the flooring down.
    250mm? Sounds like your house is relatively new mate? Circa 5years old?

    Do you have roof trusses or rafters and purlins? If it trusses, watch how much you counter battern and lay flooring on, especially if your storing on top of that as well.....trusses aren't manufactured to take storage loads!

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    Regular Member JuzzyD's Avatar
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    Thanks for the replies.

    We don't have a water tank (combi boiler) so thats not a problem.

    JCB - is the polystyrene type insulation any good compared to the fibreglass type?

    I'm not too hot on whats what trusses and purlins-wise - the house is ex-authority, mid terrace (2nd of a block of four) that was built around 1953, what it most likely be?

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    Regular Member JuzzyD's Avatar
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    Actually got another query - our roof pitch goes down beyond the level of the ceiling joists (so we have a small section of pitched ceiling in the rooms below). I assume that we would have to leave some form of gap between the top of the insulation and the roof for ventilation? If so what kind of distance?

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    Regular Member greeningr's Avatar
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    Quote Originally Posted by JCB View Post
    250mm? Sounds like your house is relatively new mate? Circa 5years old?

    Do you have roof trusses or rafters and purlins? If it trusses, watch how much you counter battern and lay flooring on, especially if your storing on top of that as well.....trusses aren't manufactured to take storage loads!
    House was built in 1950 but has had additional insulation added by previous owners

    No roof trusses, rafters and purlins so okay, also area that I'm boarding out is above the central load supporting wall.

    Thanks Anyway

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    Regular Member JCB's Avatar
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    Jolly good greeningr.

    Juzzy - 100mm of celotex isn't as good as 250mm fibreglass, but mm for mm Celotex is much better...

    I'd suggest 100mm celotex where you want to board, and 300mm fibreglass in the eaves (lowest part of slopey bit in loft), only a gap of around 50mm between top of insulation and underside of roof required.

    You prob wont have trusses in an ex-authority house built in the 50's so don't worry....

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    Regular Member JuzzyD's Avatar
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    Thanks JCB, I'll price it up tommorrow.

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