Weathering can’t be as clearly expressed in a single number or measurement, but overall, woods with good weathering characteristics exhibit limited photo-degradation (caused by UV rays in sunlight), as well as above-average resistance to contraction and expansion, warping, and surface checking due to seasonal changes in temperature and humidity. Do you have any idea what the durability might be when used outdoors but not in direct contact with the ground and covered (I would like to use some large old growth Eastern Hemlock beams for porch columns). Identifying and Using Hundreds of Woods Worldwide. The Timber Durability chart contains 5 classes of timber, with each class determining how long each timber listed will last – these are all to BS EN 350-2:1994 – Durability of wood and wood-based products. I am in the trailwork business and it is common practice (and knowledge I suppose) that hemlock is decent trail wood (bridges and the like) in large part because it is decay resistant (not as good as cedar but better than most others in the Maine forest). Degradation can occur from fungus (caused by cycles of rain/moisture), or from termites or other boring/destructive insects. The Farmers still use it for fencing, etc., but what I've heard is that today's fast growing hemlock has little of the rot-resistance the old-growth trees had, meaning a barn built today won't last 100+ years. (Sapwood seldom has any decay resistance.) (The former notion of durability equating to physical toughness would be better explored through Janka hardness and Modulus of Rupture values.). I see that it is rated as “non-durable” with a service life of 5-10 years when in “direct ground contact”. Are Rosewoods (and Bubinga) really banned by CITES? Hemlock does glue and accept screws well, … JavaScript is disabled. Hemlock is used primarily as a construction timber, and is in good supply. One bro died and the other bro is now too elderly to continue. Hi all. Expect prices to be moderate for a domestic softwood. Appreciate that their tests were for severe decay conditions (see discussion below). Preventing Wood Rot The main factors that contribute to wood rot are sunlight exposure and moisture. My confusion stems from other sources which state it is extremely unresistant. It contains many of the most popular articles found on this website, as well as hundreds of wood profiles—laid out with the same clarity and convenience of the website—packaged in a shop-friendly hardcover book. How is Mahogany going to compare? Does not smell like a desirable choice for outdoor construction. Further, they were trying to give advice for use as a fence post where failure would be a serious event, so they had to err on the side of safety. I am in the trailwork business and it is common practice (and knowledge I suppose) that hemlock is decent trail wood (bridges and the like) in large part because it is decay resistant (not as good as cedar but better than most others in the Maine forest). I see that it is rated as “non-durable” with a service life of 5-10 years when in “direct ground contact”. Copyright © 2008-2020 Eric Meier | All Rights Reserved, WOOD! http://www.fpl.fs.fed.us/documnts/fplgtr/fplgtr190/chapter_14.pdf, VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. Does anyone know a good deal about various woods' decay resistance? If you’re interested in getting all that makes The Wood Database unique distilled into a single, real-world resource, there’s the book that’s based on the website—the Amazon.com best-seller, WOOD! Natural decay resistance of heartwood is listed in Table 14-1, as you state. 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