Ewi failure

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richardbrown

richardbrown

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Have a very small refurb Parex Ewi job which is a hard to treat rendered and painted house. I had the lads stick the eps yesterday with maite as an adhesive and this morning the whole lot has popped off the wall.

Any ideas lads?
 
Have you secured some of the eps, until the adhesive sets? The weight might be a problem here !
 
maite wont stick to a painted surface with out mechanical fixings.... there you go, what do I win?
 
owls said:
maite wont stick to a painted surface with out mechanical fixings.... there you go, what do I win?
Click to expand...
I thought the dot and dab is to straitened the walls and by using the fixings at the same time it will eliminate the effect , pretty much. I always have used the fixings after the adhesive is set. What am I missing here?
just a note- never had a problem with Wetherby . Once I had to repair EWI , burned by fire, the sheets were melted and I had to replace them . The dot and dab came off with the old render.It was so strong!
 
Hi Richard, I have done quite a bit with various EWI systems over the last 5/6 years so here are just a few thoughts on your situation re getting the EPS boards to wet fix to flat rendered and painted wall/s. Sorry I don't know what 'matie' is so cannot comment on its effectiveness. Most EWI system manufacturers supply specialist board adhesive and some providers use a 'universal' adhesive/basecoat, the specialist board adhesive is nearly always the better product to use and very rarely fails, regardless of which system you use. The important thing to note here though is that the existing rendered/painted façade which you are applying EPS boards to sounds like it has been treated with some form of weather repellent chemical or it could even be 'anti vandal' paint. Either way if it was my job I would either a) try washing it with a stabalising solution or b) lightly score the areas and seal them off with a SBR/Cement slurry mixture and then wet fix prior to pining the boards. Hope this helps cheers
 
Most systems will insist on mechanical fixings as par the warranty, why take a chance,dab it out plumb and fix that way it doesn't matter what the previous wall has been treated with.
Maitie is up there with sm700 as the best around , if any thing it's over engineered for its purpose
 
Thanks.

We are and always so fix them. We stick one day then pin the next but this is the first job I have even done where we have come in the next day and half the boards are on the deck
 
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