Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Flooring

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 01-16-2009, 03:08 PM   #1
Newbie
 
Join Date: Jan 2009
Posts: 4
Rewards Points: 10
Default

Moisture meters and radiant concrete slab


Can people in installation tell me what they know about moisture meters? I tested a concrete radiant floor we have with plastic taped down for a full 48 hours and there is not a speck of moisture. Yet the moisture meter reads full moisture. I do not want to install ANY floor until I can figure out what is going on. There was vinyl flooring down and replacing it. No moisture underneath - it is ripped up now.
What do you all think? Is the moisture meter reading the water in the radiant heat and wire mesh? Or is there really invisible moisture underneath.?


Last edited by snowydaysrock; 01-16-2009 at 03:32 PM.
snowydaysrock is offline   Reply With Quote
Old 01-16-2009, 03:24 PM   #2
Member
 
Floorwizard's Avatar
 
Join Date: Dec 2003
Location: Alaska!
Posts: 1,522
Rewards Points: 1,000
Default

Moisture meters and radiant concrete slab


You might want to do a calcium test as well. You can get them at a Home Depot or Lowes.

Floorwizard is offline   Reply With Quote
Old 01-16-2009, 03:34 PM   #3
Newbie
 
Join Date: Jan 2009
Posts: 4
Rewards Points: 10
Default

Moisture meters and radiant concrete slab


What is a calcium test? What does it mean?

Thanks
snowydaysrock is offline   Reply With Quote
Old 01-16-2009, 05:42 PM   #4
Member
 
Join Date: Dec 2008
Posts: 104
Rewards Points: 75
Default

Moisture meters and radiant concrete slab


Calcium Chloride test is what it means.

Tell us more about the meter you used.

I'm assuming you didn't drill the slab due to the radiant heat. Did you use a cheapo potted plant soil tester or something?

Separately, if you pulled up vinyl and the concrete wasn't damp and the concrete didn't get dark when you taped down the plastic and the radiant heat is on, baking moisture out, it might have been the tester...

Concrete can look and feel dry, but the moisture can be evaporating off from some point below the surface.

Two good types of flooring where there is moisture are carpet and ceramic. Moisture can evaporate off through the carpet and a non-moisture-barrier type of pad (standard rebond). It can also evaporate off from the grout lines on tile.
Mudd is offline   Reply With Quote
Old 01-20-2009, 12:23 AM   #5
Newbie
 
Join Date: Jan 2009
Posts: 4
Rewards Points: 10
Default

Moisture meters and radiant concrete slab


Funny - soil tester!

Borrowed from a guy. Brand? Real Tester? Yes

moisture level was full
no visible wetness
snowydaysrock is offline   Reply With Quote
Old 01-20-2009, 12:36 PM   #6
Mold!! Let's kill it!
 
Join Date: Feb 2008
Location: Central Pennsylvania
Posts: 2,849
Rewards Points: 2,012
Default

Moisture meters and radiant concrete slab


Be sure your tester is the proper one for measuring concrete, or that it is calibrated to the proper scale. What is dry for concrete would be damp for hardwood lumber and soaking wet for drywall. Residual moisture levels vary with the type of material. Concrete is an inherently "wet" material and usually has a high moisture level even when it is relatively dry. I've always used 3'x3' of 6 mil poly taped down for 72 hours as a guide. With radiant heat in the floor, moisture should be a non-issue.
Maintenance 6 is offline   Reply With Quote
Old 01-20-2009, 06:41 PM   #7
Newbie
 
Join Date: Jan 2009
Posts: 4
Rewards Points: 10
Default

Moisture meters and radiant concrete slab


was able to get the meter brand and got a pic. from web. (tramex)
plastic taped for 1 week no moisture still
thanx guys
Attached Images
 

Last edited by snowydaysrock; 01-20-2009 at 06:44 PM. Reason: sp.
snowydaysrock is offline   Reply With Quote
Old 01-21-2009, 06:33 AM   #8
Mold!! Let's kill it!
 
Join Date: Feb 2008
Location: Central Pennsylvania
Posts: 2,849
Rewards Points: 2,012
Default

Moisture meters and radiant concrete slab


I use one of those. Good for drywall, wood or plaster. Never had any success on concrete. Ceramic tile can be a little sketchy. I think some tiles are colored using metal oxides that throw the meter off. It will pick up pipes and conduits concealed inside a wall, so you have to learn how to avoid false readings. I once watched a guy mark off a large section of wall as having wet areas.............all in long vertical streaks. He was reading pipe runs. There was definitely moisture..........inside the pipes.

Maintenance 6 is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.