Rain Penetration Through External wall

[MFC_1980]

Hello.

The wall in question is a solid fairfaced blockwork 215 thick, with 19mm 1:3 cement/sand render to the external face which has been painted with Snowcem paint. Rainwater is penetrating to the inside of the building.

I know little about render mixes, so firstly is a 1:3 mix classed as a weak mix or dense mix and is it porous or impermeable?

What mix would generally be suitable for a single brick solid wall and what remedial measures could you suggest?

I don't have a lot more info on the condition of the render at this stage.

any help appreciated!

 

[roy c]

Well MFC you say 3-1 render coat. Is this just one coat? If so the usual procedure is a scratch coat then a top coat. Sometimes on single block or brick we "scut" the wall first then scratch then float.....

 

[onlymem82000]

Hi ya

Are you getting water running in at the bottom of the wall or damp patches on the wall?
is there earth against the external side of the wall?

There are a few things that can cause water /damp in the wall.
If you are going to Re-render the wall use a good water proofer in the mix

 

[jbonding]

whats on the inside walls?