Jump to content

moisture meter technique


Port
 Share

Recommended Posts

Hi, I'm new to the business, so please allow me to ask what may be a dumb question. When I am checking a bathroom floor, for example, with a moisture meter, is the best method to check an area away from the toilet, tub, shower first to establish a baseline reading, and then put the meter at the base of the toilet, on the floor around the tub, etc., or should I just check the possible trouble spots first? Thanks

Link to comment
Share on other sites

I do not even break out the moisture meter unless I already have concerns in the area. I will then check the area of concern and move out from there to "pattern" the area to see whether or not I am getting a false reading.

I believe urine has metals in it and will set off a meter even when there is no moisture left in the urine stained area.

At least or me, the moisture meter is only for back up of concerns I already have (personal opinion only on this as I am sure others use them all the time).

Link to comment
Share on other sites

I always go right to the spots; around the toilet, the base of a wall in finished bsmt's., the carpet tack strip in finished bsmt's., etc. I use a Protimeter SM, and there is no "baseline"; it reads moisture, or it doesn't.

One thing; if you are using the non-invasive type, standing water doesn't set it off. I tested stuff when I initially got my device; I'd pour a bunch of water on the floor, put vinyl flooring over it, then use the meter. It wouldn't read anything. After a half hour, w/the water soaked into the substrate & "spread out", it read the moisture. Anyone else tried this, or had similar experience?

What's most important is understanding the anomalies. Metal will set these things off; what you think might be moisture under the tile might be a metal fastener, metal corner bead, expanded metal lath, etc. Since there can be metal just about anywhere, it takes a while to figure this out. It isn't hard, but there is a little art mixed in the science.

Anything that looks like a leak gets checked. I don't randomly check moisture in rafters or other structural members unless there's something really strange or obvious.

Link to comment
Share on other sites

There are some ceramic tiles and granite / stone floors that can peg the meter depending on their mineral content.

Don't know which ones, but I find them occasionally.

So, yes, I take a baseline reading as far as possible from the fixtures before checking the base of toilets, base of tub walls etc.

Link to comment
Share on other sites

Thanks, guys. I'm sure experience will help a lot. Too bad my kid is older and doesn't miss the toilet anymore, so I can't test the theory of urine containing metals. I always wanted to put up a sign for him and his friends that said "We aim to please, so we'd be pleased if you aimed"

signed, The Management

Link to comment
Share on other sites

I had an EIFS inspection last week and my meters were acting really screwy. After testing several areas that would be just about impossible for moisture to get into, I went inside and removed a light switch cover place. To my surprise the entire home had a Mylar type reflective barrier wrap between the substrate and the studs. The Mylar played havoc with my moisture meters.

Link to comment
Share on other sites

Originally posted by chicago

These problems occur more with non-evasive meters I assume.

Yes and no. You can still have false positive readings with an invasive meter if it contacts any conductive material in the wall. It's most common with the non-invasive or pinless meters. I always double and triple check my moisture readings, many times with a second or in some cases a third meter. Yes, I have several moisture meters and they all have their own special use.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

×
×
  • Create New...