Effect of polyurea coatings on performance of Douglas-fir in tropical above ground exposures

IRG/WP 14-40665

S Uysal, J J Morrell

The potential for using polyurea barriers to limit fungal and termite attack was investigated on Douglas-fir lumber and timbers. Termites were capable of penetrating the barrier to attack non-treated wood as well as wood dip-treated with disodium octaborate. The coatings were also exposed above ground for 48 months in Hilo Hawaii. Samples were dissected to detect internal decay. Coated non-treated timbers had decay on the upper and lower edges of the coatings, but no decay fungi were isolated from the wood. Examination of the coatings showed that the upper, surfaces exposed to ultraviolet light experienced surface erosion and loss in maximum tensile load. The results indicate that the barriers cannot completely protect wood against fungal or termite attack, but have merit for providing supplemental protection to treated wood.


Keywords: polyurea coating, Formosan termites, Douglas-fir, pentachlorophenol

Conference: 14-05-11/15 St George, Utah, USA


Download document (1.1 Mb)
free for the members of IRG. Available if purchased.

Purchase this document