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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book.

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    Ok, it's a tall order!

    Got an old roof window in an unheated ventilated loft, single glazed glass fixed into steel frame with putty, which has dried over the summer and cracked loose, now letting rain in.

    I want a sealant goop that I can use as a short term repair till next Spring.

    Tried a "weatherproof sealant" which claims to set underwater, but it will not adhere to the damp glass. Working off a roof ladder in the rain, I can't get the glass dry.

    Any suggestions?

    Much appreciated!
    • CommentAuthorArtiglio
    • CommentTimeSep 28th 2021
    CT1 would be my product of choice, but can’t say i’ve tried it as proposed.
    • CommentAuthorowlman
    • CommentTimeSep 28th 2021
    Getting the glass dry is essential whatever you use but you could try heavy gauge, self adhesive, aluminium tape. You could try drying the glass and frame with a hot air gun first, which you may also need to remove the putty for a permanent fix in Spring
    • CommentTimeSep 28th 2021 edited
    https://www.sealantsonline.co.uk/Products/Damp-wet-tolerant-sealants-adhesives ? It mentions CT1 in particular.

    Do you need the light/view through the window until spring? Just putting a piece of plastic-covered ply over the top and sealing the plastic to the roof might be an alternative.
    Posted By: WillInAberdeenTried a "weatherproof sealant" which claims to set underwater, but it will not adhere to the damp glass.

    There is a big difference to being water / weather proof or setting under water and adhering to a wet surface.

    Posted By: WillInAberdeenWorking off a roof ladder in the rain, I can't get the glass dry.

    I would suggest waiting until the rain stops then as suggested above (gently) dry the glass off with a hot air gun - then I would use a silicon based adhesive sealant
    • CommentAuthortychwarel
    • CommentTimeSep 28th 2021
    Aquasure, its is flexible urethane type glue used for the repair of drysuits etc will set underwater.
    • CommentAuthorCliff Pope
    • CommentTimeSep 28th 2021
    Thanks all. Too wet today for taking heat guns up ladders, but the forecast is dry(ish) tomorrow so will have another go once everything dries out.
    • CommentAuthorSimonD
    • CommentTimeSep 29th 2021
    In my current build I've been using a selection of products from Soudal and have been very impressed with their Fix-All sealant adhesive. I even managed to glue Knauf Exterior Aquapanel to wood fibre insulation boards on the side grain for some bespoke reveal details and the bond was so strong, it wasn't coming apart at all without ripping the woodfibre board. Seals glass...obviously :bigsmile:
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