I have an old 1970's pre-fab garage, which seems to have concrete roof
tiles (they're more like long sheets really), but the roof has
developed leaks around where fixings go through the roof on to the the
metal frame underneath.
Is there any advice on the best way to fix these leaks?
I'm not even sure if it's safe to lean a ladder against the roof?
I'd be very grateful for any help
They will likely be corrugated asbestos. They are usually fairly solid,
but I suggest spreading your weight with boards.
The fastenings will probably be hook type bolts, hooking on to the
metal frame, with a plastic washer providing waterproofing. Replace
everyone of these bolts and perhaps the seals. A grinderette is the
easy way to remove the bolts.
Thanks for the suggestion. Asbestos is a bit worrying. I have a
couple of quetions;
The garage does indeed have hook bolts. Are they easy to get hold of?
One of these sheets has a split in the middle, running along most of
its length. Any suggestions how best to patch it up?
I believe it is called white asbestos and the stuff to be concerned
about is the blue asbestos, although you should still take sensible
Wear a mask and overalls whilst handling it, keep it damp when cutting
to stop dust flying.
The J bolts will probably be available at the better hardware stores
and certainly the bolt wholesalers. Failing that the garage
manufacturers will stock them. TV antenna installers also use something
You might be able to repair a cracked panel by the use of what I think
is called Densil tape.... It is a roll of sacking like material,
heavily impregnated with a thick grease. Others might have better
suggestions for that repair though.
I have a similar roof on my garage, but it uses wood beams for support.
The roof is nailed on with special galvanised nails which have a large
Around twenty years ago I refixed it all, but I was unable to find the
proper sealing washers for the job. I ended up getting hold of an old
truck tyre inner tube, which I cut into 2" square to fit under the
nails and provide the seal. It has worked perfectly and there has been
no deterioration of the rubber inner tube seals in all that time.
The sheets as I recall are abestos cement, which is slightly safer than
the normal white asbestos, which is a lot better than blue asbestos.
Frankly, if it's a LT project why not replace the sheets as they fail or
leak or split with the modern ?bitumen? version of them. You have to
dispose of the old one properly - the council will advise and it does
vary by location from wrap-in-plastic to special dumping areas.
DO wear a mask for "Toxic particles", it doesn't cost much.
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