Got a customer that wants a 15mm engineered wood installed (fully bonded). Its an old house with NO physical DPM. He has applied 2 coats of sika rapid dpm, has sika adhesive and flooring. Not seen job but he wants a price for install. My gut feeling is to grind off sika rapid dpm, and use Ardex system. Does anyone have any experience with sika rapid dpm?
I know Sika do have a system they ok over old subfloors but not sure if its the rapid Dpm mate. Check the tech sheet?
Trimms - i'd think you'll be fine installing onto the sika rapid dpm 2 coated, used in the past & no issues, also regularly use the ted todd rapid primer / dpm 2 coat... as per Merit, check datasheet or direct to sika init...
The only issue I can see is if he's applied the dpm himself, what was the condition of the substrate before he applied it?? If it was turd, who's to say it won't lift..Just a thought.. As for using the Sika system, another string to your bow aye
on the other hand someone else has prepared the sub-floor for the installer. Think you need it in writting that the customer has prepared the subfloor ready for installation of the flooring.
I'll contact sika tech tomorrow and check it can be used when there's no physical dpm below the slab.
Tech sheet says for floors not under hydrostatic pressure. Not sure how you test for that or if it means a floor without existing Dpm. Also says you can use it over old adhesive?
I believe that refers to the water table. The further below the water table the greater the pressure i.e. potentially basements. Matt might have to correct me here but my understanding is that the hydrostatic pressure is nil where the surface meets the water table (on grade). It could also refer to the walls of a pool being under pressure, but that was just to give an example.
