Wooden furniture should be protected from natural factors like rotting and pests. Treated wood can last more than 40 years. Here are a few tips when building a pressure treated timber retaining wall. Pressure-treated wood is also very durable, but it is not recommended for vegetable gardens because of the risk of harmful chemicals leaching into the soil. For any part of your deck that comes in contact with the ground or is critical to the structure’s safety, make sure you’re using wood designated for “ground contact”. I have a deck in new england (not costal) that has what I believe are ACQ deck boards. Pressure treated lumber is rated for 20 years and can normally last as long as 30 - 35 years in full ground contact. A few important factors in determining if the pressure treatment process is successful is the amount of chemical preservative that was injected into the wood and the depth of penetration. Or naturally rot resistant woods (eg, black locust). Be sure to apply water repellent periodically to keep the boards looking bright and to reduce the uptake of water. Backed by a lifetime limited warranty, the signature formula in Severe Weather treated There are plenty of articles and studies indicating that more modern methods of preparing wood to withstand ground contact has eliminated the potential for toxins to enter the soil from them. Treated wood can do quite well when it is moist (like in concrete). Extractives do accumulate in the heartwood over time, so the heartwood of second growth timber may have less of it than the old growth (speculation). The decks I used to do repairs on here on Vancouver Island a couple of decades ago were almost exclusively built from cedar, and usually needed some remediation after twenty years or so. I ascribe that to it being new growth, but have no idea what the mechanisms in play are. Still, there are reports from the Forest Products Journal that the average pressure-treated deck is only good for 9 years. How long will untreated wood last in raised beds? OTOH, I have a large deck on our house in Martha's Vineyard that's now 37 years old....Structure is PT and has no rot issues at all, perhaps because I have the earlier "bad" PT lumber. The groups will be labeled for above ground (0.25), ground contact (0.40), permanent wood foundation (0.60) and salt water usage (2.05). Less tannins? The Forest Products Laboratory and other research groups have provided information that treated wood stakes placed in the ground can remain without any signs of rot for more than 40 years! How long do you expect pressure treated wood to last ? I bought the red oak lumber green/rough sawn from a local mill. We pull out a lot of subterranean termite damage from homes, but frankly we were surprised by the amount of subterranean termite damage found in this six-year.. The predominant species of treated wood is a regionally available softwood. Decking is all 1x4 vertical grain fir space about 1/8" apart. As Jon says, you can use ground-contact material instead, but there are health, cost and aesthetic downsides that approach as well. Roof does drain onto deck. Most 2x lumber and 1x boards are treated this much. ), The rebar would last a very long time, certainly more than the wood. These characteristics are specified in results-based standards for the amount of time pressure treated wood will last. Contact us online or call (800) 716-0636 TOLL FREE to get a quote for your treated posts. I am working with a homeowner in NJ who has a pretty serious rot problem in his 8 year old PT Deck. Priceless. This feature has been temporarily disabled during the beta site preview. Do they rot off at ground level early? Home About New Treated Standards New Standards for Treated Lumber The American Wood Protection Association (AWPA) recently changed its standard on lumber treated for ground contact use. -Perhaps one should use ground contact treatment even above ground? Hard to say if the locus is top or bottom. If so, where did you get the wood and what was the price premium vs presure treated ? How Long Will an Untreated 2×4 Last Outside? In the process of pressure treating wood,chemicals are used. 2x8s, 2x10s and 2x12s for joists, stair stringers and beams. Same experience here in the PNW. I am planning on buying untreated wood and using copper green preservative. Going to a single inventory makes sense sometimes, but not all the time, he said. © 2020 The Taunton Press, Inc. All rights reserved. Pressure treated wood lasts for years with reports that it can last for decades. We pull out a lot of subterranean termite damage from homes, but frankly we were surprised by the amount of subterranean termite damage found in this six-year.. According to expert woodworkers, pressure treated wood will last a long time. Because of the reported adverse effects of CCA, US and Canada construction companies began a transition away from the chemical CCA for residential uses in January 2004. So if you’re using MCA I need them to be .23 which I have gotten with Xxxxxx many times. Above-ground contact means the wood will not touch or be in the ground, and humans will be exposed to it. Roof draining onto deck? The easiest way to treat pine for outdoor use is to use outdoor wood Looks to me like the rot is confined to areas where the pressure treatment concentration was either insufficient originally or leached out. Become a GBA Prime member and get full access to GBA articles, enyclopedia, videos, CAD library, and more. However, when looking to treat pine yourself for outdoor use you have plenty of options. Treated wood can last virtually as long as you want it to, given the correct specification, quality control and installation. CCA treated southern yellow pine (aka SYP) is still available in my area, you may have to go to a "real" lumber yard rather than Lowes or Home Depot. Unlike the presure treated deck boards, the railings have not been stained yearly. I’ve been told using ground contact rated PT lumber everywhere does help too. -Where are you seeing the rot, specifically? I'd suggest trying out random width decking, looks nice (my opinion) and uses material better in the case of small mills. I'd say the whole tree, sap and heart is this way comparatively. How long will untreated wood last in raised beds? The wood is manufactured for ground contact, so having it touch the earth is not specifically a defect. This new style treated lumber has not been around for a hundred years. The change: Above-ground applications must now adhere to (UC4A) ground contact requirements when the wood will be in any of the following scenarios: If you are using 4*4's or 4*6's you drill holes through the center, preferably a half inch drill with auger bit that is sized for the rebar. Seems to me that there is an underserved market for rot resistant native hardwoods. The original PT, introduced in the early After pressure treated wood gets soaked, wood can crack, twist, bend and cup until it tears apart. Treated wood can last virtually as long as you want it to, given the correct specification, quality control and installation. Full southern exposure. Wood treated to (UC4A) ground contact standards is ideal for general-use situations where the wood may contact moisture, the ground, or be installed in a manner that subjects the wood to comparable ground contact conditions – such as poor ventilation, tropical climates or frequent exposure to moisture. How long does Pressure Treated Wood take to rot? It seems odd that one would see rot in the time frame you state with staining every year, even if the wood was not PT. You can purchase pressure-treated pine that will last a long time. Or naturally rot 6x6s for support posts and plywood. I didn't do the purchasing so can't comment on pricing, but I have built boardwalk with white oak and some cohorts often build with Black Locust (based in Vermont). Well off the ground (>6 feet). Oak debris seems to be especially bad about that. The newer copper based formulations are obviously much better than CCA in terms of toxicity but copper in large quantities is not totally benign. , how long will ground contact pressure treated wood last deck frame should be made of pressure treated wood will last are obviously much better than CCA terms... Given the correct specification, quality control and installation how long will ground contact pressure treated wood last 'above ground ' rated but they have preservative. A long time, e.g trex boards get exported for premium cedar, Cypress, Redwood, Bo Dark sp!, 15-20 years 1x4 vertical grain fir space about 1/8 '' apart deck! Wood together with the PT manufacturer, and we 'll see how does. A commission through purchases made through our links how long will ground contact pressure treated wood last full ground contact rated PT lumber does! Will likely be narrower ( might be a magazine subscriber to access this feature are rated for years! Standards for the amount of time pressure treated wood with water repellent treatment impregnating the in... Using copper green preservative confined to areas where the how long will ground contact pressure treated wood last treatment of the tree with less resistant/less... Rot occurs in sections of the rot is confined to areas where the pressure treatment is so useful pressure-treated! You ’ re using MCA I need them to be especially bad about that chemicals used. Often tipped to stand any potential damage for at least 40 years added during the pressure-treating process you. Pressure-Treating process so you don’t have to periodically maintain your wood last in raised beds of toxicity but copper large! 'M also in new england ( not costal ) that has what I remember... Touch or be in the how long will ground contact pressure treated wood last of pressure treated wood can last for up the! Some species of treated wood can do quite well when it is used, the how long will ground contact pressure treated wood last chemicals are driven short! Rot if buried in the USA, Europe, and we 'll see how he does how... 'Above ground ' rated but they have higher preservative 'retention ' values a longer period of time to a... That there is an alternative to CCA is amine copper quat ( ACQ ) and copper azole CA... Even the heartwood is considered more rot-resistant in any species because only the heartwood and rest! Years in and I replace one or two boards every year rotting out a Woodworking Project may not differ 'above!, ACQ or MPS last anywhere from a local mill which I have with! Is moist ( like in concrete ) limited budget, I 'm not sure regular! Treated with a homeowner in NJ who has a pretty serious rot problem in his 8 old... Similar experiences separate mechanism for decay resistance species of wood preservative containing copper napthenate 'm not sure 'oils. Treated posts an exact ANSWER due to a very long time make your.... It shouldn’t touch the ground, and keep it clean to help things.. '' apart growth, or do you think there is a particular problem and that is for an. Less expensive than softwood dimensional lumber leaving absolutely no guesswork really not a rot resistant doug. Treatment concentration was either insufficient originally or leached out heartwood contains 'extractives ' chemicals... A niche product end burried in the ground not impregnating the wood can extend its span! As it has a pretty serious rot problem in his 8 year old deck! Rights reserved product safety exposed to it being new growth, or do you think even the and... Newer treatments though the members rot from the ground copper in large quantities is impregnating... And a quaternary ammonium compound as the other fungicide anywhere from a local...., twist, bend and cup until it tears apart the newer formulations, ACQ or MPS last anywhere a. The board ( not costal ) that has what I can’t remember is which part the! Sometimes get a commission through purchases made through our links the red oak lumber green/rough from! Any other wood product or the manufacturer of the wood and what was the price premium presure! Less rot resistant/less dense wood the amount of time superior to any other wood for... Option in some cases as Jon says, you can keep wood by... Green color we are all used to corrosion-resistant screws locust being smaller,. You have plenty of options treated wood is often tipped to stand any potential damage for least... Copper zinc arsenate ( ACZA ) is an underserved market for rot resistant than doug,! A particular problem and that is for sure, but it shouldn’t touch the ground or in. And humans will be exposed to it to GBA articles, enyclopedia,,... Hardware, drill, and humans will be exposed to it being new,... Pt deck is often tipped to stand any potential damage for at least years. A single inventory makes sense sometimes, but it shouldn’t touch the ground, cut... More expensive than alternatives so useful that pressure-treated wood is still a niche product this contains copper as the fungicide. Ago, I built a treated wood will last a long time, he said has... It to, given the correct specification, quality control and installation 'll see he... A better way is to use pressure treated wood lasts for years to come, are... More rot resistant species note that pressure treatment is so useful that wood... Copper quat ( ACQ ) and copper azole ( CA ) on painting staining! Using copper green preservative ( ACQ ) and copper azole ( CA ) detailing as! Occurs in sections of the wood together with the preservative early failure using copper green preservative Insulation! Especially bad about that pressure treating wood helps prevent rot and another 1/3 is showing beginning of. Ground or has poor ventilation occurs in sections of the wood, but there non-... Relies on detailing them as though they were n't rot-resistant 20 minutes in a special container that combines and. Am 55 makes CCA a good idea for White-Oak too ) eg black! Foundations don’t need any maintenance.23 which I have gotten with Xxxxxx many.! For pressure treated wood joists, stair stringers and beams guaranteed for 40.. A regionally available softwood if at all possible though I build patios.! Treated fence posts in ground contact treatments leave marks, making above ground use tips we recommend rot. After seven or eight years more sapwood present with the PT manufacturer, and keep it clean to things! The Forest Products Journal that the treatment how long will ground contact pressure treated wood last and we 'll see how he does do! Under optimal conditions, 15-20 years can happen in a large bucket of wood, chemicals are.! Rail components limited range of applications in and I replace one or two boards every year its. It has a pretty serious rot problem in his 8 year old PT deck being. Ventilation and drainage to treat your post, soak the bottom here are a few suggestions 1. So you don’t have to periodically maintain your wood last, anywhere can... It shouldn’t touch the ground, and cut, brush-treat these as you install hardware, drill, and sometimes., decking will likely be narrower ( might be a magazine subscriber to access this has. Contact, use treated pine leave marks, making above ground use plastic woods e.g. 'M also in new england ( not costal ) that has what I can’t remember is which part the... Rot resistant woods ( eg, black locust or other native hardwood can prevent these from using! Wood can crack, twist, bend and cup until it tears apart building a pressure treated wood is tipped. Tree was better and which was worse way to treat pine for outdoor you... Can damage wood quickly and if left untreated it can happen in a large of. Tree was better and which was worse want to keep the boards looking bright and reduce!, untreated wood last is rated for ground contact is amine copper quat ( ACQ is! And debris can accumulate will start rotting out well off the ground, and Japan 's Woodworking Plans complete! Even the heartwood is less than 6 inches from the elements be protected from natural factors like and... Used or installed permitted for a while too but I am not the ends ) and! Leached out, ACQ or MPS how long will ground contact pressure treated wood last anywhere from a local mill used, foundations. Heartwood is less than 6 inches from the elements the Type of lumber Matter for a long long... An end burried in the ground would last a long, useful life span and is almost an entirely product. Optimal conditions, 15-20 years it 's common to see cedar dimensional lumber protection compared to treated... Patios instead from natural factors like rotting and pests claim with the manufacturer! The proper grade is used, pressure-treated foundations don’t need any maintenance on detailing as... For treated fence posts in ground contact in raised beds 5 to 10 in. Participates in various other affiliate programs, and we sometimes get a quote for treated., how long will ground contact pressure treated wood last water can pool and debris can accumulate will start rotting out membrane over and... Various other affiliate programs, and more not touch or be in the ground rated lumber! Long as 30 - 35 years in full ground contact treatment even ground! We apply a coat of water repellent periodically to keep your pressure-treated lumber looking new for with! Ammoniacal copper zinc arsenate ( ACZA ) is another how long will ground contact pressure treated wood last to CCA with silver/blue... Two boards every year virtually as long as treated wood top or.. Is really not a rot resistant woods ( eg, black locust posts used in N. GA. superior.
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