Durability + Design
Follow us on Twitter Follow us on LinkedIn Like us on Facebook Follow us on Instagram Visit the TPC Store
Search the site

 

Problem Solving Forum

| More

Question posted - January 8 to January 12, 2018:

How can you determine the moisture content of a concrete block (CMU) wall, and how can you judge when the moisture level is sufficiently low to paint?



More items for Maintenance + Renovation


Selected Answers

From Zenith Czora of Zen Consultancy on January 11, 2018:
Using a moisture meter like Tramex CME4, depending on the moisture content, the measurements are made to a depth of several centimeters. The concrete wall is deemed dry enough to coat when the moisture content is not more than 5.5 percent. The other type of moisture meter is Radio Frequency Moisture Meter, where the detection of moisture is displayed on a relative scale from dry to damp, rather than by percent moisture. If there is no moisture meter available, the plastic sheet method is the way to go.This method is a qualitative test and does not really measure moisture content but shows evidence of moisture and whether the moisture is moving toward the wall, in which case the CMU wall is typically ready for coating application. This test involves covering the surface of the CMU wall with impermeable material such as plastic sheet. A 460X460-mm square of 0.1-mm thick plastic sheet is placed on the CMU wall surface and sealed around the edges  with tape. After 16 to 24 hours, the sheet is removed and the area is inspected for moisture or color darkening. Color darkening occurs in some instances when the moisture movement is slow and there is still a slight dampness on the surface.Please read the article, MOISTURE IN CMUs: WHEN IS IT SAFE TO PAINT, from D+D, Spring, 2017


Please sign in to submit your answer this question

   

Tagged categories: Concrete masonry units (CMU); Moisture detection; Moisture management


Current PSF Question | Submit a PSF Question | Full PSF Archive

Advertisements
 
Shield Industries, Inc
 
FireGuard® E-84 Intumescent Coating - Shield Industries, Inc
 
Trust the certified protection of the industry’s most innovative intumescent coating FireGuard® E-84 to provide you with the 1 and 2 hour fire ratings you need.
 

 
Keim Mineral Coatings
 
Mineral Silicate Paints + Stains Fuse to Concrete
 
• Forms permanent chemical bonds
• Becomes part of the concrete
• Will never peel
• Looks completely natural
 

 
Novatek Corporation
 
Novatek Portable Air Filtration Systems
 
Air Scrubbers/Negative Air machines for restoration, abatement, dust & odor control, hazardous contaminant removal from job sites to clean rooms and hospitals. Portable, affordable!
 

 
 
 

Technology Publishing Co., 1501 Reedsdale Street, Suite 2008, Pittsburgh, PA 15233

TEL 1-412-431-8300  • FAX  1-412-431-5428  •  EMAIL webmaster@durabilityanddesign.com


The Technology Publishing Network

Durability + Design PaintSquare the Journal of Protective Coatings & Linings Paint BidTracker

 

© Copyright 2012-2018, Technology Publishing Co., All rights reserved