News — moisture meter

Spray Foam Substrate Moisture and RH Testing

Posted by Randy Isaac on

Spray Foam Substrate Moisture and RH Testing

Substrate Preparation SPF can be sprayed on wood, concrete, metal, asphalt, foam sheathing, and other substrates. But the substrate needs to be clean and dry — “paintable” is a reasonable benchmark — for the foam to adhere well. SPF shouldn’t be installed when temperature and humidity levels fall outside the range recommended by the SPF manufacturer. Moisture. When a surface is wet or damp, the moisture acts as a blowing agent that reacts with the “A” side of the SPF system, resulting in off-ratio foam with poor physical properties and poor adhesion. When the foam is sprayed on wet framing...

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In-Situ Moisture Testing (The Right Way)

Posted by Randy Isaac on

In-Situ Moisture Testing (The Right Way)

The Study In July 1996, Dr. Göran Hedenblad,  Lund Institute of Technology, Stockholm, Sweden performed experiments measuring the relative humidity within concrete by performing in-situ testing at different depths within a concrete slab. His work identified a Relative Humidity (RH) gradient within a slab that had its surface exposed, where the RH increased as depth into the slab increased. Hedenblad went on to show that after the concrete slab was covered by a flooring material with minimal permeability,  moisture was prevented from migrating out of the concrete surface. During the process, the RH gradient equalized to an average RH throughout...

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Moisture Meters and Why You Use Them

Posted by Randy Isaac on

Moisture Meters and Why You Use Them

Structurally sound and beautiful in appearance, wood is the ideal raw material. Woodworkers know that moisture content is the single most important factor affecting the quality of their project. To ensure quality, from the mill and dry kiln to the finished project, moisture meters help minimize defects such as shrinkage, cracks, and splits. Years of experience, high-tech tools, controls and premium grade lumber cannot make a difference if moisture content goes unchecked. Are There Different Types Of Moisture Meters? There are two types of moisture meters commonly used in lumber and woodworking applications. Pin-Type Moisture Meters:A pin-type uses two pins that...

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Avoid Wet Hay

Posted by Randy Isaac on

Avoid Wet Hay

Avoid Wet Hay Make quality hay even when the sun doesn’t shine. Added moisture has prevented plant maturity and cutting at the proper time. Cut hay has been rained upon, and the wet ground has exacerbated the drying time for hay ready to bale. The wet conditions can diminish hay quality through increased dry-matter (DM) losses, reduced nutritive value, escalated heat and even increased mold content. According to Max Hawkins, a nutritionist with Alltech’s Mycotoxin Management Team, hay will lose 5%-6% DM until the hay reaches 40% moisture during the drying process. Dry-matter losses increase as large bales are placed...

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What Is Relative Humidity In Concrete?

Posted by Randy Isaac on

What Is Relative Humidity In Concrete?

Relative humidity (RH) is often mistaken for moisture; however, these are two completely separate terms. Moisture content represents the amount of water in liquid form, while humidity levels represent the amount of water in vapor form. In ASTM F2170, relative humidity is defined as "the ratio of the amount of water vapor actually in the air compared to the amount of water vapor required for saturation at that particular temperature and pressure, expressed as a percentage." Simply put, relative humidity represents the amount of water vapor that is present in the air in comparison to the amount that the air can hold. The Difference...

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