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Thread: Holes in asbestos roofing sheets

  1. #1
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    Holes in asbestos roofing sheets

    Anybody with good tips on repairing holes in asbestos roof sheets? Only a few over the shed roof golf ball size so needing a cost effective solution without needing to replace sheets/roof. Cheers

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    Re: Holes in asbestos roofing sheets

    Have done a few with fibreglass matting. If you can gain access to roof from above a quick wire brush in the grinder to clean/rough it up will help (if you're sure they're fibre cement). Sticky tape will do a remporary repair aswell.
    Ond lle bu'r arad' ar y ffridd Yn rhywgo'r gwanwyn pr o'r pridd

  3. #3
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    Re: Holes in asbestos roofing sheets

    I have had success with Flashband in the past

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    Re: Holes in asbestos roofing sheets

    We've done fibre cement sheets from underneath using pieces of skylights and a decent waterproof no nails type stuff. Used skylight as we could see through it to make sure the gunk gave an all round seal. I'm not keen on getting up on to sheds and am much happier underneath them! Assume it'd work on asbestos too?
    Stay in Northamptonshire - meadowviewcottages.co.uk

  5. #5
    Member Agri Design's Avatar
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    Re: Holes in asbestos roofing sheets

    Full sheet can be fitted from underneath.

    Some info here on my website.

    There are fixings on the market for doing it from the likes of Filon. The product is called Filon Fixsafe



    David

    Agri Design
    Agri Design specialise in the design of agricultural buildings.

  6. #6
    Senior Member Huffy's Avatar
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    Re: Holes in asbestos roofing sheets

    I get up on the shed roof with a pair of ladders and planks along the steps .
    Cordless drill and tech screws , mastic , wire brush and some 25 litre plastic barrell cut into strips with tin snips . Cut a patch a bit bigger than the hole , mastic around the edge and theen 2 tech screws top and bottom . Smooth over the mastic with your finger (rubber gloves)

    Bobs your uncle

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    Re: Holes in asbestos roofing sheets

    Quote Originally Posted by Huffy View Post
    I get up on the shed roof with a pair of ladders and planks along the steps .
    Cordless drill and tech screws , mastic , wire brush and some 25 litre plastic barrell cut into strips with tin snips . Cut a patch a bit bigger than the hole , mastic around the edge and theen 2 tech screws top and bottom . Smooth over the mastic with your finger (rubber gloves)

    Bobs your uncle
    Flashband is waaaay easier than that!

  8. #8
    Senior Member Huffy's Avatar
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    Re: Holes in asbestos roofing sheets

    Quote Originally Posted by WillyScale View Post
    Flashband is waaaay easier than that!
    Aye , but tech screws dont lift

  9. #9
    Senior Member 4wd's Avatar
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    Re: Holes in asbestos roofing sheets

    Similar idea to sliding lengths of rooflight underneath, I've 'fixed' three or four leaks from sheets with a crack in the valley by using a length of old plastic guttering cut in half lengthways.
    You soon run out of spare roof light sheets but most of us have bits of plastic guttering and they can be longer if need be.
    Anything stuck on the outside is going to leak or move eventually I think.

  10. #10
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    Re: Holes in asbestos roofing sheets

    Put gaffa tape over the hole and paint over with Acrypol waterproof paint. Temporary solution but quick to do.

  11. #11
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    Re: Holes in asbestos roofing sheets

    your safe enough on the sheets, just remember to always stand on the head of the nails there's always a purlin underneath your foot then.
    there are two types of roof lights, one made of fibre, it doesn't let as much light through but its a lot stronger and longer lasting.
    the others are cheaper and very see through, but be careful drilling them they will crack very easy. go for the fibre ones if you can.
    the twisty nails will unscrew with a mole grips, easy job.

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    Re: Holes in asbestos roofing sheets

    For small holes and cracks.I use silicone sealer.economy type from screwfix 2 tube.Sticks to wet asbestos sheets from the underneath of course.

  13. #13
    Senior Member 4wd's Avatar
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    Re: Holes in asbestos roofing sheets

    Quote Originally Posted by rogerm View Post
    I have had success with Flashband in the past
    I got a roll of this to try.
    With asbestos sheets do you try to scrub them, or use primer?
    Any disturbance seems to make more dust than it removes, apart from any health risk.
    Also it looks like ideally you want to warm it after applying, is a gas blowtorch OK as it's a fair way to trail wires for a heatgun!

  14. #14
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    Re: Holes in asbestos roofing sheets

    Quote Originally Posted by 4wd View Post
    I got a roll of this to try.
    With asbestos sheets do you try to scrub them, or use primer?
    Any disturbance seems to make more dust than it removes, apart from any health risk.
    Also it looks like ideally you want to warm it after applying, is a gas blowtorch OK as it's a fair way to trail wires for a heatgun!
    I've been very pleased with aluminium backed flashband onto both lime/cement plaster walls, and old wooden boarded ones. As far as I'm concerned, primer is essential, and works very well onto most surfaces if any accumulations of loose dust are brushed off roughly. Primers from different sources do vary a lot, from thick and tarry to quite watery, and you may need to try some to find which you like best. They have some sort of rubbery sticky stuff in them as well as bitumen. However, on a warmish day there's no need for a heat gun at all, though you might need one in frosty conditions, when the flashband goes awkwardly stiff as well as being less sticky. In winter I take my roll of band into the kitchen and leave it there overnight to warm it up, and it stays handleable long enough to get a few metres on.

  15. #15
    Senior Member sprocket's Avatar
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    Re: Holes in asbestos roofing sheets

    Quote Originally Posted by banjo View Post
    your safe enough on the sheets, just remember to always stand on the head of the nails there's always a purlin underneath your foot then.
    there are two types of roof lights, one made of fibre, it doesn't let as much light through but its a lot stronger and longer lasting.
    the others are cheaper and very see through, but be careful drilling them they will crack very easy. go for the fibre ones if you can.
    the twisty nails will unscrew with a mole grips, easy job.
    Maybe OK if purlins are 7 x 2`s, but we went to resheet a roof couple of years back & 3 x 2 pulins turned to dust as we removed sheets due to woodworm. All looked OK from distance.

  16. #16
    Senior Member wr.'s Avatar
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    Re: Holes in asbestos roofing sheets

    Quote Originally Posted by 4wd View Post
    I got a roll of this to try.
    With asbestos sheets do you try to scrub them, or use primer?
    Any disturbance seems to make more dust than it removes, apart from any health risk.
    Also it looks like ideally you want to warm it after applying, is a gas blowtorch OK as it's a fair way to trail wires for a heatgun!
    Blow torch is ideal. Only needs a couple of seconds though and use a dry rag to gently smooth it down or wear a glove. The bitumen burns a bit when it gets hot.
    Don't itch for something if you're not prepared to scratch for it.

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