water proofing my exterior walls

[scottishjohn]

now the winter has come with very high winds and driving rain --lots of it 50mph + 

i am experiencing some slight water penetration  in some areas

 what is the best product to coat all theexterior walls with 

without making them shiny and changing the colour of the granite

I suspect there are very small cracks in the pointing and maybe some of stone work

 certainly small as ther isn,t much you could repoint 

and as they used granite sand in the pointing its a real problem to chase them out

 

[gaz_moose]

if you waterproof them and water does get in then how is that water going to get back out?

 

I waterproofed some fence panels with some waterproofer from screwfix, the water just beads off it like a waxed car. some areas of concrete fence posts got sprayed in the same stuff and would repell the water. (i should really have a look to see how it is holding up when its next raining but not minging)  I did read in the reviews that some mad man used it on a brick wall with good results.

[Beau]

14 minutes ago, gaz_moose said:

if you waterproof them and water does get in then how is that water going to get back out?

 

For those of us in very exposed locations when is the water going to get out? We get periods were you get several months were it rains most days and walls hang wet throughout. Our barn was like this and after a few weeks of wet weather the water would run down the inside of the wall. Ended up tanking the inside and lime pointing the outside which worked perfectly. 

 

 

John I have no magic answers sadly.

 

On my workshop which has porous render and pointing I used some Thompsons water seal. It worked for 4 or 5 years but now needs doing again

 

Old buildings can be a PITA

 

Edited Friday at 16:16 by Beau

[Redbeard]

Safeguard Chemicals do 'Stormdry' (I think) and I once used (breathable) Belzona 5122. The hazard sheet had me dressed up like a deep-sea diver! I don't think it has been perfect but it made a significant difference to a house which received much oof its rain horizontally.