Applied Research   Laboratory Testing   Biological

Soil Bed Decay

Test Method: AWPA Standard, E14-94 -Standard Method Of Evaluating Wood Preservatives In A Soil Bed.

1/2x1x10 inch (13x25x254 mm) treated (and untreated) stakes are inserted half-way into the soilbed. The soilbed is saturated with water each week and the soilbed room temperature is maintained at 85F (29C) to accelerate decay. At specified time intervals each stake is pulled and rated for degree of decay. The stake is removed from the soilbed when a light bending force causes it to fail.
Decay stakes in a soilbed. Also shown is water-spraying apparatus.

Soil Block Decay

Test Method: AWPA Standard, E10-91, Standard Method of Testing Wood Preservatives by Laboratory Soil-Block Cultures, 1999. Also, ASTM D1413 and WDMA TM-1.

3/4 x 3/4 x 3/4 inch (19 x 19 x 19 mm), or project-specific size treated (and untreated) soil block specimens are dried, weighed and innoculated with decay fungi in a jar containing soil, which is then maintained at approximately 80F (27C) and 80% RH. After a specified time period the soil block specimens are removed, dried and weighed to determine the weight loss due to decay.

Mold Resistance

Test Method: MTU developed (Click link for detailed test method)

4x6 inch x board thickness (102x152 mm) treated (and untreated) specimens are sprayed with inoculum and placed horizontally on a screen, which is enclosed inside a container and maintained at 80F (27C). The bottom of the container is covered with water, which does not contact the specimens, to achieve ~100% RH. At specified time intervals the top surface of each specimen is rated for degree of mold coverage.