What if the sub floor has no physical dpm and you use a expoxy type dpm, is the answer the same as above ??
Epoxy surface membranes still shouldn't be used as a proper dpm, all the tech sheets except for ardex dpm 1 c state they still need a mechanical dpm
Not seen or tried their new ones, but are they gonna do the old chestnut it's the subfloor that's failed or are they gonna stand by their claims?
I'm missing something here ,for about 10 years I've gone over a lot of floors in houses with no dpm. Most houses in merseyside are old floors. I have used laybond one coat membrane 2 coats F.balls f75 2 coats Ardex dpm1c 1 coat No fails. I must just be lucky !!!
There's a laybond that says u can go over a floor with no phisical dpm i do a lot of work for an estate and all their cottages have no. Dpm , few vinyls have bubbled , so they want me to price the options
will look at that .... But getting back to the original question , what about the moisture , Where will it go ?
It's been answered Rob in the first couple of replies to the OP... I was at the Quick-Step academy for an Ardex product training day a few months back covered by Colin Ward (Ardex tech) and David Clay (Contracts Manager). They went through the way moisture suppressants work like the Arditex 1 C...Basically saying that the moisture goes up...Although at a much slower evaporation rate. I did raise the question with David of how will slowing down the drying time of a concrete slab by fast tracking with a liquid dpm effect the concrete? Unfortunately, he wasn't able to give me an answer. So I assume he hasn't seen problems associated with lengthening the drying time.
i didn't word that very well , what I meant to say was that is it the same effect with an epoxy type dpm , which when down looks like nothing could breathe through it
Rob - Ardtex dpm 1 C is an epoxy type dpm. I know it looks like glass, but at a molecular level, pretty much everything has permeability, even glass. It's just a question of over what time span and what rate (The moisture transference rate (diffusion) through a material can be altered by it's chemical make-up and also by the applied thickness of a product like a dpm). Water 'proof' products are granted that name subject to a timespan and performance, and often given a limited guarantee (showing it's limited nature - might be stating the obvious here ). The word proof being a nice sales term IMO. That's my understanding of it, but I welcome anyone else's opinion or knowledge. I may be completely wrong with this chaps so do your own due diligence an all that and give me a slap in the face Tarkett - Thanks mate..After seeing your statement and doing a little reading, it does seem like that is the case. However, the internet is such a double edged sword. I found another article that mentions long term retained moisture can degrade concrete. Suppose it depends on the grade of concrete used and respectively the installer (Like bodgy builders using less cement in the mix for money saving).
My knowledge on that started from matt before I began reading everything I could get my hands on to do with concrete application and construction
Yep, you understand it correct. Only bit i will add- slowing down the drying of concrete is a good thing. It will gain strength. However, if no builders dpm then the concrete will always be wet. There is no protection from the ground and chemicals etc being introduced. For example, you wash your car, those chemicals now go into the ground and are now possible in the concrete slab. Alkaline can cause many issues with concrete. If there is no physical builders dpm the concrete can degrade .
so then, when you lot ready to step up to learning about alkaline and osmosis in concrete and epoxy dpm? or are we all still trying to digest moisture and how it works in concrete / epoxy dpms? LOL
LOL, that is worse end of the reaction. Just for you spacey, the above formula is- Ca(OH)[SUB]2[/SUB] + H[SUB]4[/SUB]SiO[SUB]4[/SUB] → Ca[SUP]2+[/SUP] + H[SUB]2[/SUB]SiO[SUB]4[/SUB][SUP]2−[/SUP] + 2 H[SUB]2[/SUB]O → CaH[SUB]2[/SUB]SiO[SUB]4[/SUB] · 2 H[SUB]2[/SUB]O Copied and pasted as there is no way i would remember the above. Nor would i use it on a course as its simply nonsense to a floor layer.
