blown render

[jimbo71]

Hi guy's
I've been asked to render a garage internally, the exterior wall has earth against it and the damp has come through, would a waterproof agent prevent this from happening again? I can't access the outside wall to remedy it that way.

 

[superspread]

No

 

[johniosaif]

Tank it, best method would be using membrane like(delta) then board over

 

[S a plastering]

Don't forget to lap it a good 3 inches using the waterproof seal an do around the plastic plugs aswell then dab onto the plugs

 

[User___removed]

As it's only a garage tank it(vandex or similar then render

 

[jimbo71]

Thanks for your advice, im looking to hack the old render off then apply the vandex, the building is an old barn and constructed from stone, its a really rough background, would it need a s/c scratch coat before vandex?

 

[johniosaif]

Thanks for your advice, im looking to hack the old render off then apply the vandex, the building is an old barn and constructed from stone, its a really rough background, would it need a s/c scratch coat before vandex?

If it's really rough you could do a sand and cement coat with sika and then vandex. Any chance lime render would do the job ?

 

[leebo02]

yeah give it a coat of s&c first mate

 

[D4mp]

It depends on your clients expectations?!
Are they looking to have a generally dryish wall?
Are they looking for a waterproofing job, which this is as it's a retaining wall? And wouldn't expect any dampness to floors and walls?
Cement tanking will push the dampness up into the wall plate, and across the floor.
I would use a membrane system with a drainage channel if it was me.

 

[jimbo71]

Cheers lad's, the client expects a dry wall, I've looked at the sika products but was a bit confused by which one is best, I see an alternative to vandex is mapei, has anyone used this, pro's and con's of each?

 

[wiganlad]

Dig down outside the wall. Tank and hydro board the wall. Land drain and back fill the hole with pea gravel about a foot widespread the way up the wall. Then you should be able to render inside as normal and as said bang some Sika in to be sure

 

[jimbo71]

Yeah I would like to but the earth outside is about 8ft high and 50ft deep!

 

[jesssop]

:RpS_confused:

 

[adapt]

Tank it if I was you, sbr coat first, tanking then what ever finish you need.

Don't forget the floor is it damp ?