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



Keim Mineral Coatings

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 Crommelin 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

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!

Dow Coating Materials
Need smooth, durable and appealing coatings?
Dow Corning® 52 Additive improves abrasion resistance & slip in:
• Waterborne paints, inks &
• Wood coatings
• OPVs
• Exterior & interior paints
Samples available.

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.

PPG Paints
This high-hiding, low-VOC, low-odor paint enables a space to be painted while occupied and delivers the durable product performance professionals require.

EMME Controls
EMME (Energy Management Made Easy)
• Achieve a zone in every room for 1/2 the cost
• Save up to 40% in energy consumption
• Works in any size building
• Can be installed in as little as a few days without remodeling
• Comfort results guaranteed in writing

Digital Facilities Corporation
Manage the Building Envelope
FM-Pro™ is designed to inventory and manage Building Envelope asset information and is suited for building owners, asset area consultants, and product suppliers.

Atlas Material Testing Technology
Helping You Put Your Products To The Test
  • Outdoor Accelerated Weathering
  • Laboratory Testing Services
  • Accelerated Weathering Instruments

  • www.atlas-mts.com

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

Garland Company
Architectural Wall Coating Damproofs and Beautifies
Tuff-Coat™ multi-functional coating bridges hairline cracks, hides stains and discoloration, and reduces wall temperature, increasing the wall's life cycle.


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