The Medway Handyman wrote:
Lobster wrote:
Stuart Noble wrote:
The Medway Handyman wrote:
Lobster wrote:
A small lump of render has fallen out - think it's been knocked by
something. The hole is rather flaky and very powdery, so I think
if I just repair it as it using a bit of mortar, it will simply
fall out again.
If this was an internal repair I'd be sloshing on dilute PVA first,
however that's not suitable for outside is it?

What does the panel reccomend I do?
You can get waterproof PVA. AFAIK it only becomes waterproof when
mixed with cement as a slurry, but it might do the job.


All pva does is prevents the brickwork absorbing water from the
mortar before it's had a chance to set. Works indoors or out and
really has nothing to do with how waterproof it is in the long term.
Thanks both.

So does that mean "waterproof" PVA is snake-oil and I can just as well
use the ornnery stuff I already have in!?

There are deffo two different grades, the waterproof one being twice the
price of the standard.


You buy at wrong place.

General purpose - £3-00
Water resistant - £3-12

Both per Kg inc. vat. Seems to be decent qaulity - least I have never
had a problem with it, conforms to all sorts of BS and Euro standards.

http://www.isaaclord.co.uk/searchProducts.aspx?searchTerm=pva&searchType=All% 20Words

Or I do! Difference, though, is negligible.

As I was writing I realised that it actually says "water resistant" not
"waterproof". I guess it depends on quite how important your application
whether the difference might be significant.

--
Rod

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