Borates; Wood--Deterioration; Wood-decaying fungi; Decks (Architecture, Domestic)
A conventional wood recreational deck constructed with spruce-pine-fir lumber was sampled for active growth of wood decay fungi before and 10 months after remedial preservation treatment with fused disodium octaborate rods (IMPEL®) at boric acid levels from 1.5-10 kg/m3. Extent of boron distribution was observed with a color indicator dye (curcumin) after 10 months exposure. Remedial treatment with the boron rods. was nearly 100% effective. Active decay cultures from treated material were found only in samples obtained from boards treated at the inhibition dosage level (1.5kg/m3) of boric acid. Suggested lethal dosages (>3kg/m3) were effective in all cases as indicated by the failure to recover any decay fungi. In contrast, the numbers of active decay cultures from nontreated boards increased over the exposure period. Curcumin tests for diffusion indicated excellent distribution of boric acid in wood material where moisture contents exceeded 25% (ovendry weight basis).
Dietz, M. G.,
Schmidt, E. L.
Borate Rods as an On-Site Remedial Treatment for Control of Decay in Wood Decks.
Journal of the Minnesota Academy of Science, Vol. 53 No.2, 22-26.
Retrieved from https://digitalcommons.morris.umn.edu/jmas/vol53/iss2/7