I'm not a carpet guy, but I would expect this question more for resilient... If it had carpet down, I do not see any reason why you couldn't simply scrape the floor, use a high quality multi purpose, and install.....
There is a ghost that haunts glue down carpet installations called plastisizer migration. The parts of multi-purpose adhesive that make it stringy when it's set (neoprene rubber etc.) can, and do, migrate towards old dried out adhesives. In your case the scraping should remove the old glue and minimize the effect. The primer merely separates the two adhesives and also minimizes the effects of plastisizer migration.
Fuzzy Sideup said: ? I am bidding a carpet job in a large church. They have existing glued down carpet over concrete (15 years old). We will be scraping up the existing carpet. Do we need to put down a primer? I have been told contradicting methods. Does adding a primer actually enhance the bond with new adhesive?Click to expand... I would LOVE to Scrape-Away and prime over all the old multi-purpose we find when we demo old glue down carpet. But the treatment the floors/existing adhesives get is VERY product specific. So what I mean by that is there's a SPECIFIC type of adhesive under the old carpet. Your new carpet has a SPECIFIC backing type. The adhesive you use.....may or may not be SPECIFIC to the particular backing material. Generalizing in this kind of a question is a fools game. If you're pulling a standard jute or action back laid over a standard multi-purpose and the EXACT same sort of combination is going on top it would be unusual to do anything other than COMPENSATE on the trowel notch size for gluing over old glue. Typically if the old adhesive is loose, soft, crystallized we'd scrape the hell out of it, sand it even if it's THAT dry and then sweep and vacuum the dust. AND THAT'S ALL. Where we might take extra steps is where the backing is different than the standard like those rubberized or vinyl backed goods that require specific adhesives that are NOT basic multi-purpose. In those case we probably would insist on a scrape away and skim coat-----usually not JUST a primer. The type of contract we'd normally be bidding on those kinds of COMPATIBILITY issues are stipulated to the flooring contractors so it's not so much something left to our discretion. In other words THEY TELL US what to do after consulting with the manufacturers.
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