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Posted: Wed Jan 22, 2014 11:13 pm
by GB_Groundworks
Anyone used low expansion foam to dot and dab plasterboard to brick walls albeit painted brickwork
Was going to use standard adhesive but came across this method and got me thinking.
I've got about 300m2 to fix
Edited By GB_Groundworks on 1390432419
Posted: Thu Jan 23, 2014 12:47 am
by lutonlagerlout
we tried it once and it was a disaster
if its painted then we prime the wall with PVA then use drywall adhesive
why were you thinking of foam giles?
cheers LLL
Posted: Thu Jan 23, 2014 6:50 am
by msh paving
im stripping out flood damaged house at mo. house we are doing now the conservatory was done with foam onto lightweight blocks , no stick the boards were also held on with screws,seamed crap to me MSH 
Posted: Thu Jan 23, 2014 11:33 am
by GB_Groundworks
Just saw it and wondered if it was the new thing that saved time and money but ill stick to board adhesive
Posted: Thu Jan 23, 2014 1:09 pm
by mickg
I watched it being used on a loft conversion about 4 years ago and was not impressed with it but the plasterers thought it was brilliant - the young lad was stood there holding the piece of board waiting for the foam to set then still had to wedge it in position as it kept falling down - doh
it works well if your patching up a hole so you don't have to wait for the drywall adhesive to set hard before skimming but for large areas I personally would use adhesive
Posted: Fri Jan 24, 2014 10:14 am
by Tony McC
I know it has its uses, but I often think that this expanding foam gunk is a cowboy's dream as it almost encourages bad practice and corner cutting.
This step repair I spotted in that London is a classic example of f*ckwittery.....
Posted: Fri Jan 24, 2014 6:38 pm
by slowbutrough
I think you may be after this GB, 'Insta stik mp' made by Dow. I've never used it personally but it is designed specifically for the job, I.E it's not just your normal £4.00 a tin funny foam. HTH
Posted: Fri Jan 24, 2014 7:41 pm
by DNgroundworks
which pleb would bed a step unit down with foam?!
Posted: Sat Jan 25, 2014 11:39 am
by Tony McC
That location is owned by a big property company and it was re-paved around 10 years ago using very expensive yorkstone flags and portuguese granite setts. Over the years, there have been a few repairs, some down to poor installation (not all that many, actually), some due to the insatiable desire of utility companies to dig up new paving, and some due to changes in use.
In this example, the stanchion was added some time after the yorkstone step was installed, and I suspect that either the tread unit was removed to be drilled to fit the base plate, or in-situ drilling rattled it loose from its bed. Rather than chip out the old bed and jointing to effect a proper re-lay on new mortar, the installer had the bright idea of 'glueing' it back into place with expanding foam. This just goes to show that they obviously had neither any genuine paving skills nor the nous to bring in a paving specialist to re-seat the tread.
I'm guessing they didn't think it through and hadn't understood that their brilliant idea would result in a massive case of 'sore thumb syndrome'. The failure to clean the spillages just confirms the diagnosis of f*ckwittery! 
