Sika waterproof render

Monica

New Member
Hi, I'm NOT a plasterer, but want some advice. A builder who I want to employ is planning to use Sika waterproof render on an internal party wall and a window wall. He is reputable. He wants to use a multi finish topcaot. Is this ok? Or should he use a limebased topcoat? The walls have a damp issue and my surveyor says not to use any chemical damp proofing as it's an older building.
 

raytheplasterer

Well-Known Member
if it's in a basement area Sika tanking will be good because you don't want the walls to breathe in a basement, possibly the surveyor is recommending against a chemical injected damp treatment into the bricks.
 

Monica

New Member
Hi Jess,
So, do you think the multi finish skim over the Sika render is all right then. The builder says he's not had issues before-I'm just worried about a few years from now.
 

JessThePlasterer

Queen Jess Elizabeth I
Hi Jess,
So, do you think the multi finish skim over the Sika render is all right then. The builder says he's not had issues before-I'm just worried about a few years from now.
You can use multi

ask five different plasterers about damp and you’ll get five different answers

I don’t know anything about your house or seen the job to say whether I think cement is best but he can use multi over it
 

Retired Spread

Well-Known Member
Hi, I'm NOT a plasterer, but want some advice. A builder who I want to employ is planning to use Sika waterproof render on an internal party wall and a window wall. He is reputable. He wants to use a multi finish topcaot. Is this ok? Or should he use a limebased topcoat? The walls have a damp issue and my surveyor says not to use any chemical damp proofing as it's an older building.
@John j
 

Bigstevehammer

Well-Known Member
I’ve used multi over sika,in the three coat application process,on the advice of the surveyor/client..and they had real damp problems,a house stuck at the bottom of the hill with no soak away etc,..I’ve had no call backs etc,Over a good year ago..so must be ok.
But then again,he had more money than sense and prob a high rise by now
 

Monica

New Member
I’ve used multi over sika,in the three coat application process,on the advice of the surveyor/client..and they had real damp problems,a house stuck at the bottom of the hill with no soak away etc,..I’ve had no call backs etc,Over a good year ago..so must be ok.
But then again,he had more money than sense and prob a high rise by now
Thanks Bigsteve. This sounds positive. The builder does seem to know what he's about-it's just Sika saying use limebased topcoat. It gets veeeeery confusing for an ordinary person!
 

flippityfish

New Member
Hi, just to add on top of this thread. Is it possible to put sika (sikalastic) ontop of existing plaster?
My builder mentioned that they won't be stripping off the existing plaster, but I thought you always had to go back to the brick and then build up again for any waterproofing?

Thanks in advance!
 
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