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Sealing/water-proofing corrugated cement sheets

Does anyone have any experience/advice regarding sealing/water-proofing corrugated cement roofing sheets?

The sheeting would be ~30 years old (unsure whether it's asbestos), it's a garage roof and looks in generally good condition, no obvious cracks or damage but some moisture/damp seems to be getting through the sheeting - presumably because the material is slightly porous?

Not a major leak, just drips appearing on the underside of the sheeting following rain, letting moisture into the garage.

I've seen you can get various waterproofing paints/coatings, wondered if anyone had used these and had any comments/recommendations?

Comments

  • tony6403
    tony6403 Posts: 1,257 Forumite
    Part of the Furniture 1,000 Posts Combo Breaker
    edited 10 January 2014 at 11:57PM
    I have used Thompson's water seal on concrete blocks and it sealed them completely.
    Assuming that it is just a porous roof and that there are no areas where rain is being driven under it, that would be my choice if I were dealing with your roof .
    Forgotten but not gone.
  • phill99
    phill99 Posts: 9,093 Forumite
    Part of the Furniture 1,000 Posts
    It'll be asbestos
    Eat vegetables and fear no creditors, rather than eat duck and hide.
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