Concrete Moisture Test Using Plastic Sheet Method - What Could Go Wrong?
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- Опубликовано: 5 авг 2024
- Have you used the plastic sheet test method for measuring moisture in concrete? What did you think about the results, did you know what to do with the results? To test via the plastic sheet you need duct tape, a piece of plastic sheet, and 16 hours of wait time - so what could go wrong? Well, the plastic sheet test method is not reliable at all because the results don't tell you much of anything. All it'll tell you is if your concrete slab has moisture.
Watch the video as Jason demonstrates the plastic sheet test method for measuring moisture in the concrete.
*The Rapid RH® 4.0 has been replaced with the Rapid RH® L6. Check out the Rapid RH® L6: bit.ly/RapidRHL6
For more information, please call (800) 585-3023 or email Jason at jspangler@wagnermeters.com.
(www.wagnermeters.com) 
Хобби
Since this came up as one of the top results when I googled how to test moisture of concrete, I would highly recommend that you change the title of this video. If it is not a good method for testing concrete maybe you should title it "Poor method for testing concrete for moisture." I downvoted this because of the misleading title.
I appreciated you video and the humor of your scale and you made me more aware of the limitations of this method. I am a coatings expert and have written several ASTM standards. I have had significant success with this D4263 method, but I generally couple it with either a Delmorst (pins) or a Tramex type meter (mine is a small one, not unlike yours I think) or if that not enough since I have a lab I just run mass based moisture with a loss-on-dry machine.
As a result I have seen all these methods miss it.
I see the plastic sheet as simply a mock-up of what a coating or sheet might "see" and of course to take away the variable of surface evaporation. I work in the western US, and our dryer climate influence most construction practices and this is not exception. Often we get false low leadings from meters like the Pin based ones that are at least as misleading as the sheet is- and those percentages are pure fiction too. I have found the Eddy-Current types to be better screening test. I still use the plastic sheet because I want the contractor to see that fact that moisture in the slab becomes moisture on top of the slab as soon as its coated. I think this fact is the key to is persistance and why I still use it.
My market is roofing so, often after I screen, I may turn to cores (pretty easy). In flooring I think I'd want to still use the sheet after I scanned the floor with a Eddy-Current Meter, but then use a relative humidity method with a drilled hole. I have also found that pH is often a bigger source of pain than the moisture. So in any case I check pH with some special strips with the right range or a dye.
question i have moisture coming in in my living room and bedroom front porch? in winter it fell cold moisture. could it be porch concrete
needs sealant?
why not place an RH meter under the plastic?
No need for color gradiant scale if the slab darkens it's a no-go. Also, I would recommend first grinding the concrete in the spot you are testing.
Why show the video? Because some manufacturers still to this day recommend it.
Yeahsss sirhh!!!!...
why is it worthless ? not being a wise guy im just asking cause i dont know.
What if you see no moisture greying or droplets? then isn't this a good way to verify that you don't need to take extra steps to install your flooring? not being a smart ass...genuinely asking
Anthony:
No visible signs of moisture from this method MAY be telling you that the very top surface isn’t emitting moisture. On the other hand, it could be merely telling you that conditions are such that condensation isn’t able to form on the surface of the concrete. Bottom line, even if there is no change under the plastic, this testing method isn’t an acceptable form of testing for MOST finishes, to establish a product performance warranty. Knowing what the moisture is like in the slab, based on in situ relative humidity testing, helps in predicting long term functionality of the floor.
Thanks,
Jason
Because people are still using this method, and this could lead to disastrous results.
Why is this worthless? I was going to do this to test my walls. What do I do instead then?
You are unable to quantify how “bad” of a moisture problem you MAY have. Without this information, it becomes very hard to determine the appropriate course of action to remedy the situation so you can install a finished flooring system.
Ummm? Why even show us then?
Why go through the trouble of showing this worthless testing method?