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A forum community dedicated to professional woodworkers and enthusiasts. Fluorescence: A Secret Weapon in Wood Identification, Bow Woods (from a mathematical perspective), Brazilian Rosewood, East Indian, and Other Rosewoods, Genuine Lignum Vitae and Argentine Lignum Vitae, BOOK: WOOD! Do you have any resources that you could point me to that might help me in this? Natural durability of solid wood. (I think a bridge would be a high concern use especially when loaded to its maximum design weights, in which case, a little decay could mean a failure.). 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). On the other end of the spectrum is wood such as Teak, which is well-known for its durability, and is frequently used in boatbuilding and other outdoor applications. (Sapwood seldom has any decay resistance.) While it is easy to work with, the material trades off its workability for lowered strength. Durability of Hemlock. Thanks, Gene. Western hemlock also is harder, stronger, straighter-grained, and resin-free. I'll do some research on this and get back to you..... That is great Info, thank you. I am interested in the durability of Eastern Hemlock. One last question, Is there a durability difference between old growth Eastern Hemlock (harvested in 1790)… Read more », (This is a monthly update, and your email will be kept private.). It is a moderately expensive wood. Sustainability: This wood species is not listed in the CITES Appendices, but is reported by the IUCN as being near threatened. Identifying and Using Hundreds of Woods Worldwide. 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? Copyright © 2008-2020 Eric Meier | All Rights Reserved, WOOD! When most people hear the word “durability” in relation to wood, they immediately think of its ability to withstand dents and scrapes. Does not smell like a desirable choice for outdoor construction. Good read. Preventing Wood Rot The main factors that contribute to wood rot are sunlight exposure and moisture. (The former notion of durability equating to physical toughness would be better explored through Janka hardness and Modulus of Rupture values.). Guide to natural durability and treatability of selected wood species of importance in Europe. Allegedly the wood is Mahogany (no idea what type) Allegedly the best boats were built from an Indian Teak known as Ironwood which is allegedly so hard that the marine worms won’t eat it. It is not durable when exposed to condi-tions favorable to decay. This wood is grown in Eastern North America and is rated as being very durable and resistant to decay. How is Mahogany going to compare? I have one particular confusion regarding eastern hemlock. 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. 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. Hi all. My confusion stems from other sources which state it is extremely unresistant. The wood grips screws and accepts all glues without a problem. One bro died and the other bro is now too elderly to continue. JavaScript is disabled. Personally I wouldn’t touch… Read more », I am interested in the durability of Eastern Hemlock. Hemlock is listed as little or no natural decay resistance. 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). 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. Identifying and Using Hundreds of Woods Worldwide, POSTER: Worldwide Woods: Ranked by Hardness. I see that it is rated as “non-durable” with a service life of 5-10 years when in “direct ground contact”. Identifying and Using Hundreds of Woods Worldwide. 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! The FYI: I receive a commission on sales generated through links to Amazon, eBay, etc. Expect prices to be moderate for a domestic softwood. 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. You can work hemlock easily with hand or power tools. 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). Some genera of Bamboo are only expected to last 6 months to 3 years in direct ground contact. The boat has never been put into the water but rainwater that has accumulated inside the hull constantly drips out of joints between the planks. A friend is interested in buying an Eric-32 boat (still unfinished) that two brothers spent thirty years building. Come join the discussion about shop safety, wood, carpentry, lumber, finishing, tools, machinery, woodworking related topics, styles, scales, reviews, accessories, classifieds, and more! http://www.fpl.fs.fed.us/documnts/fplgtr/fplgtr190/chapter_14.pdf, VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. Like many softwoods, hemlock lacks the durability of other exterior door materials such as mahogany or oak. However, in this context it specifically refers to a wood’s ability to resist elemental and natural forces of decay. The wood tends to separate parallel to the annual rings. Appearance: When freshly cut, it is pinkish brown and darkens to a medium reddish brown with time and exposure to light. Does anyone know a good deal about various woods' decay resistance? For a better experience, please enable JavaScript in your browser before proceeding. I am still unsure as to why there are discrepancies, because in trail applications, the wood is certainly exposed to the elements and many use it knowing and considering this when they select hemlock over pine, fir, most any deciduous tree, and spruce (although I've heard it compared similarly with spruce, which is oddly also not on the list where I thought it'd be), The basic source of knowledge about wood comes from the WOOD HANDBOOK, published by the US Forest Products Lab. 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. Western hemlock, with its straight grain and finer texture, sands to a silky, reflective smoothness. Because of this vague definition, only woods that have notably good (or notably poor) weathering characteristics will be noted. ( Again, Teak is noted for both its excellent durability and its superb characteristics! Fyi: i receive a commission on sales generated through links to Amazon, eBay etc... Fungus ( caused by cycles of rain/moisture ), or from termites other. Genera of Bamboo are only expected to last 6 months to 3 years in ground... Again, Teak is noted for both its excellent durability and treatability of selected wood species not... Bro is now too elderly to continue ( caused by cycles of rain/moisture ), or from termites other! Poor ) weathering characteristics. ) America and is rated as “ ”..., as you state North America and is rated as “ non-durable ” with a service life 5-10. Forum community dedicated to professional woodworkers and enthusiasts: the hemlock question is one i 've pondered that notably!, VerticalScope Inc., 111 Peter, Suite 901, Toronto,,. Timber, and resin-free America and is rated as “ non-durable ” with a service of... Harder, stronger, straighter-grained, and is rated as “ non-durable ” with a service of... Not as well as cedars and white pines little or no natural resistance. Of this vague definition, only woods that have notably good ( or notably poor ) weathering characteristics will noted... Hemlock is listed as little or no natural decay resistance it is not durable when to... Life of 5-10 years when in “ direct ground contact ” species importance... Not durable when exposed to condi-tions favorable to decay hemlock wood glues easily and holds paint moderately well but as., eBay, etc like a desirable choice for outdoor construction do you have any that! All Rights Reserved, wood through Janka hardness and Modulus of Rupture values )... Hemlock easily with hand or power tools western hemlock, with its grain... 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