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Harry Bloomfield
 
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explained on 13/03/2005 :
Lobster wrote:
I've got an old brick shed with a concrete slab roof; watertight at the
mo, but in one corner (external) the surface of the concrete has broken
up under the influence of weather; probably an inch deep? in a 4-5 inch
slab.


3:1 is the strongest non-shrinking mix, and just a little pva makes it
adhere better.

NT


Then once properly dry, consider adding a waterproof membrane to
prevent water getting into and freezing in the concrete again.

--

Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.org