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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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    • CommentAuthortonya
    • CommentTimeOct 12th 2021
    Is there any way to determine whether corrugated roofing has asbestos content cheaply? I have a roof on an outside building and its leaking and wish to replace it. Fortunately i found a Council refuse point that will take it but before I get into removing it would like to know whether it contains the dreaded asbestos.
    • CommentAuthortony
    • CommentTimeOct 12th 2021
    No! Ring on the pricing,has it a name on it, is it white on top, does it snap easily, how old is is it?

    Recommend double bagging it and tell them you are bringing it to them
    Plenty of places around which will do a test on a sample for £40 -£70. Carefully take your sample with due precautions (see HSE asbestos essentials site), double-bag it, mark its provenance, send it off and that should tell you, unless you are unlucky enough to have a roof which is a mix of asbestos and non-asbestos!
    • CommentAuthortonya
    • CommentTimeOct 13th 2021
    Thank you for your comments/thoughts.
    I had same on a garage in the grounds the same property and after finding council who would take it bagged it up and did so.Since it naturally creates dust when breaking it down it's good to know what it is. I reckon its from late 50's or early 60's. Ihave come across thin grey flat stuff before which I reckon was-only a small sheet. This is thicker and doesn't snap easily. I also have a flat with a garage and it is one of many (about 30) They need to be replaced and its maintained they are asbsestos but as far as I know no check has been made. Given what they want to charge I will send a sample away. Interestingly my son who lives in the flat saw a surveyor looking at the roof on behalf of his client (who was potential buyer). Surveyor thought it was asbestos but no test was made. All too easy for those who can benefit from it being asbestos to simply say it is.
    • CommentTimeOct 13th 2021
    Posted By: tonyaAll too easy for those who can benefit from it being asbestos to simply say it is.

    I think it's more likely the reverse, to be fair. All too easy for a surveyor to be sued for saying something wasn't asbestos when it is. Same result though. An abundance of caution. But it's either caution or pay for a test.
    • CommentAuthorrevor
    • CommentTimeOct 13th 2021
    Is the sheet repairable. I have had cracks in "asbestos" sheets and sealed them with a butyl mastic. I would not bother getting it tested. Assume it contains asbestos. Wet the sheet with a water hose or watering can and suit yourself up with a disposable suit and mask and carefully remove it. Double bag it in strong plastic for your local refuse centre. There was a transition period when sheets went over to non asbestos and they have a brown line on the sheet so I was told by an agricultural roofer.
    When replacing broken rooflights on one of our buildings, which I was hoping wasn’t Asbestos sheets, I noticed when I got up close to it, that printed along the very edge of the sheet (on the long edge where they overlap each other) was the word ASBESTOS
    my understanding was that type of roofing pretty much always has asbestos in it
    • CommentTimeOct 13th 2021
    What type? AFAIK non-asbestos equivalents directly replaced all (?) patterns of asbestos sheets? So it cd be asbestos or non-.
    I went to a CPD about corrugated cement fibre sheeting but I can't recall the date - might have been in the 1980s - when they stopped using Asbestos and switched over to non-asbestos using the same machines. Now they also put plastic tape inside to hold them together if they crack - I seem to recall this might have been an indicator that it is non-asbestos because it is more recent (please don't rely on this anyone!)
    • CommentAuthorphiledge
    • CommentTimeOct 14th 2021
    Unless youre prepared to pay £1000s for a licensed contractor to treat it like blue or brown asbestos, and given that youve already removed one roof, theres probably no point in having it tested?? Just treat it like white asbestos which is far less hazardous. As already suggested damp the sheets down while removing them, work up wind, wear a properly fitted ffp2 mask, gloves and suit. Handle the sheets gently so your not creating dust or breaking them and keep them dampened. When the garage floor has dried hoover the dust up and pop the hoover bag in the asbestos skip with the sheets and ppe.
    • CommentAuthortonya
    • CommentTimeDec 10th 2021
    Thanks for all your comments. I will remove it and bag up as I did before and just treat it with respect (or should it not be disrespect!) and take to council depot that takes it not too far away. However thinking of best replcement before taking it off....
    • CommentTimeDec 15th 2021 edited
    I find all varieties of profiled sheet offensive - except classic 'corrugated iron' profile (3" pitch x 3/4" height) which can look handsome, even delicate, if done neatly - or at least 'vernacular' if done farmer-style roughly. As well as the 0.5mm galvanised standard, which rusts pretty soon in a picturesque way, it can also be ordered 0.7mm thick, which lasts longer, and/or plastisol colour coated which is good and durable https://www.cladco.co.uk/sheets/13-3-corrugated-0-7-thick-pvc-plastisol-coated-roof-sheet
    • CommentAuthorEd Davies
    • CommentTimeDec 15th 2021 edited
    Posted By: fostertom…or at least 'vernacular' if done farmer-style roughly
    That's what I'm aiming for, honest. :wink:
    We have several outbuildings that were retrofitted with box-profile sheet and they have not worked well here. The profile seems to fill itself up with damp composting leaves and then rust underneath that layer. The screw fixings are in the 'valleys' not the 'ridges' which is a problem when they leak, unlike with trad corrugated profile.

    For your one of the 30 garages I would look at what has worked well for neighbours! I'm leaning towards fibreglass.
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