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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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General: Supadeck or under-tile?

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    • CommentAuthorRoberts
    • CommentTimeAug 5th 2007
     
    Hello, I hope someone can advise which is the better solution for insulating a utility/ storage loft:

    1. 123mm Supadeck over ceiling joists, with breathable fabric stapled to joists to reduce dirt.

    2. 50mm Celotex between/ under rafters

    The loft hatch is small, so the Celotex would have to be cut on the ground floor.

    Any advice very welcome
    • CommentAuthortony
    • CommentTimeAug 6th 2007
     
    1. don't store stuff in the loft either throw it away or sell it

    2 If you must have a storage area there I would always insulate at ceiling level and 300mm of quilt is good then 50mm air space then a simple wooden floor deck. Supadeck is more expensive and I would be concerned about moisture build ups.

    3. Insulating under the rafters is a waste of time and effort as wind will for sure get in and around it making it useless
    •  
      CommentAuthorNovy Mlyn
    • CommentTimeAug 8th 2007
     
    Tony, wouldn't stuff in the loft act as thermal mass for heat coming in from the sun?
    • CommentAuthorRoberts
    • CommentTimeAug 8th 2007
     
    Thank you for the advice. I shall consider.

    Am interested to know if anyone has used Supadeck. It's a better solution for me than a floor deck over mineral wool because I need to keep a boarded route to access the boiler.

    To reduce the risk of moisture build-up I could put a vapour resistant layer on the underside of the bathroom ceiling.
    • CommentAuthormoogaloo
    • CommentTimeAug 13th 2007
     
    Posted By: tony1. don't store stuff in the loft either throw it away or sell it

    2 If you must have a storage area there I would always insulate at ceiling level and 300mm of quilt is good then 50mm air space then a simple wooden floor deck. Supadeck is more expensive and I would be concerned about moisture build ups.

    3. Insulating under the rafters is a waste of time and effort as wind will for sure get in and around it making it useless


    1. There is storage and storage, some stuff is used and needs to be kept somewhere, it is surely greener to use a loft for storage then to buy a bigger house with an extra room

    2. Is it possible to isulate from the room below and lower the ceailing, if the ceiling is high enough, so if you have 100mm joists you could put 200mm under the ceiling on the floor below and plasterboard over and then 100mm between the joists and deck over the top?

    3. Can you qualify what you mean by this? Why will it for sure get in and why will that make it useless?
    • CommentAuthorRoberts
    • CommentTimeAug 15th 2007
     
    Thanks for the extra advice moogaloo.

    There is room to insulate under the ceilings but it is more disruptive - for example, we have fitted floor to ceiling alcove wardrobes in the main bedroom that would be affected.

    I'm also not sure why undertile insulation would mean the wind would get in. That doesn't happen in regular loft conversions!

    There's very little information available on the options - surprising as it is a very common problem!

    I'm inclined to board out half the loft in Supadeck and leave the other half as mineral wool - and staple cotton sheeting to the rafters to stop the dirt getting in.

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