These products last a long time. How long will my pressure-treated posts last in the ground? Reply. posted 2018-May-29, 5:42 pm AEST O.P. Water repellent treatment is still a good idea on all wood exposed to the weather. Depends on so many factors that any general answer is nonsense. User #78054 9161 posts. With pine, I'd probably avoid film finishes, as the wood may check or crack a lot faster than a good outdoor wood. User #761791 209 posts. It will be on a metal brace that's attached to a concrete block on the ground (which will most likely be gravel covered in a plastic moisture barrier). (See table 1). Woods estimated to last more than20 years above ground, and thus classified as most resistant, included the heartwood of Douglas-fir, western white pine, redwood, Eucalyptus sp., red and white oak, lodgepole pine, ponderosa pine, western red cedar, and the sapwood of redwood, white oak, and red oak. I am planning on buying untreated wood and using copper green preservative. Water repellent helps keep wood dimensionally stable. How We Built Our Pine Garden Beds 6th November 2019 . Due to a very limited budget, I cannot use pressure treated wood. Alder, pine, hemlock and poplar are among the weakest and least weather-resistant. Apply a coat of polyurethane over the sealant. Ignoring the preservative, how long will untreated wood last? It is also commonly used for closets, saunas, and house siding. The first thing you should know in estimating the life of your fence is the natural life of your wood. Reply. Q. I have a wood deck outside my house that is made of untreated wood. In a case where large numbers are supposed to be installed, it is practical to drive them into the ground using a hydraulic post driver. Redwood, Pine and Cedar Untreated redwood, depending on it's age, has a projected life span of 50 years or more when exposed to the elements. mopy. Natural life of wood. How Long Does Non Pressure Treated Cedar Last Outside? Untreated redwood, depending on it's age, has a projected life span of 50 years or more when exposed to the elements. An alternative to pressure treated wood is Trex or any other brand of recycled lumber. This mainly has to do with how long the wood that you’ve chosen is going to last, and how soon or long it’s going to be before the wood needs to be replaced. Untreated wood may rot in as little as 3 years when exposed to water, soil, and insects. Certain types of wood can hold up against rot much longer. garrai818. The matte finish removes the high shine. I want build the pergola but I want to do it in white. Pine varieties have a projected life span of only 5 to 10 years. Heartwood of these species generally provide rot-free performance in an untreated state. No woods fell into the nonresistant class (< 7 years expected average life). Basically, their answer was it lasts a long time exposed to the elements... mickey_maher | Apr 23, 1999 09:09pm | #4 I am curious how long OSB bd. Lumber that has been factory pre-treated is the best to use for outdoor furniture and other exterior projects. Follow. It’s a question we get asked quite often, but it’s tricky to provide a quick answer because it depends on a number of factors, such as the type of wood, age and thickness, as well as the amount of rain and drainage. From my own experience I know you really can't paint pressure treated wood and have it look good, at least within the first year, plus I really don't like the look of pressure treated wood. I just want to seal the table good so that it will last a long time and I’m not sure what product to use to not get a glossy finish so your Matte finish on the last coat is intriuguing. On my last trip to England I visited the cathedral in Ely and was struck by the longevity of large structural beams made from a material that I dont really think of as a millennial building material… wood. … Having made the mistake last year of putting in some raised beds for my veggies using the 'new' pressure treated lumber, & looking at paying $5 per foot for cedar, I'm thinking of putting in more raised beds ( and replacing the pressure treated boards) from pine. For example, untreated pine may only last a few years outdoors before rotting. Even if we had to replace them every 6 years, keeping harmful chemicals out of our home-grown food is worth it. Pine logs are made from thinning small trees out of plantations, so all the outside wood is Sapwood, and generally at least 80% is Sapwood. (What’s the reason we grow our own food in the first place, right?) In other words you could build a WOFATI every 3 years and still be better off than renting! I can use all pressure treated douglas fir 2x6 boards, I think that's more durable than any plywood. How to Use Untreated Lumber Outside By Wade Shaddy ... white oak and fir are some of the toughest, most weather-resistant species to look for. If you can find it, the _oil based_ version of Olympic Maximum is also very, very good! The water based version of the same stuff is awful. The sealant helps the finish stick better to the pine and last longer. How long will untreated wood last in raised beds? Pine lumber wont last a year untreated.. yella wood or CCA treated wood will last to 20 years. Untreated lumber, exposed to the elements and moisture, is at risk of weathering and rotting over time. Since rent here is about $1200 a month, just living in that WOFATI would have a return on investment of less than 2 years. posted 2018-May-29, 5:42 pm AEST ref: whrl.pl/Re93ny. How long will untreated pine wood last outside? You did not specify the thickness of the pine you used. Anything above ground will last for a very long time made out of regular wood if it is painted or protected from the weather (inside framing for example). Obviously they are going to last longer then that. In general, though, treated lumber shouldn't be used where untreated lumber will suffice. 3 years ago. Borden Green January 27, 2014 at 7:48 pm. Ongoing tests sponsored and monitored by the USDA Forest Service’s Forest Products Laboratory confirm this finding. There are several treatment processes and treatment levels containing fungicide and insecticide. 3. Original Author. Let the sealant dry for 24 hours, then dip a paintbrush in undiluted polyurethane. Pine Timber treated to H3 will last a lot longer in a dry climate than a constantly humid one. Before I knew about square foot gardening, I had built a 40 foot long 12 inch high box out of untreated 2x12 Douglass Fir against my back fence. We expect a non treated pine to last between 5-10 years when used outside. Even if not painted or protected, it will last pretty long. While treated wood has distinct advantages, you might decide that they aren't worth the added health risk. How long will Douglas fir planks last if left untreated outside, not directly exposed to weather, but some moisture occaisionally Ask Question Asked 5 months ago It will sit on the dirt. I want to use a douglas fir 4x4x8 beam to mark out the edge of a garden. But does the blue/red treated pine need weather protection? If your raised beds will be exposed to a lot of moisture, wood like pine may only last a few years. Anything "can be used " but dont expect it to last very long Get the proper treated stuff and stop being a tight arse . I'm building a shed foundation. How long do pressure treated fence posts last? Featured Answer. But I also live somewhere where the rain is moderate and the drainage is very good. Oregon white oak posts, similar to the cedar posts in girth but containing some sapwood, were somewhat less durable. A properly pressure treated pine fence posts, for example, can exist for a range of 20–35 years if well installed while the untreated one only lasts between 3–7 years. I would not use pine it won't hold up as long as cedar or vinyl unless you plan to sell soon, sorry but this is my opinion. The Sapwood is easy to penetrate with the preservatives. That was 4 years ago and I am just starting to see signs of rot this year. The main beams that support the 170 foot tall “lantern tower” called the Octagon are about 700 years old, and show no sign of deterioration (pictured above and below). The most commonly used wood types for fences are cedar, spruce, and pine. It was filled with the topsoil I dug out of my back yard to put in a patio. However, it is either hard to find or very expensive to get certain dimensions of lumber. Cedar wood projects typically last more than 20 years without splitting, rotting, or warping. Pine will work fine if prep on the wood is done correctly. How long will that last? Untreated split cedar posts, long used in western Oregon where they have a history of good service, lasted 23 years on the post farm under conditions favorable for decay. Tests have shown they last 50 to 100 years in many landscape situations if they are treated to H5. Some years ago a baseball player got in trouble for having too much of it on his bat when he used it to make the handle easier to grip. Or should I get the kind treated with a bunch of chemicals? You would expect non pressure treated cedar fence, for example, to last 15 and 30 years, especially if you take good care of it in terms of maintenance practices. Thanks. Opaque and semi-transparent deck and siding stains can also help pine last outside. Pine Tar is a more or less natural product, which is used mostly by farriers these days. How Long Does Timber Cladding Last? How long any wood lasts will depend entirely on the type of wood and local conditions. The two types of preservatives most commonly in use in Australia today include: Heat (Outside! This helpful guide, put together by timber cladding experts NORclad, will explain how long timber cladding lasts as well as tips for making it last longer. If it had a life of 25 years, that is $1000 a year in costs. 3) A deck built with pressure treated wood will last a long time. In the penalty box reference: whrl.pl/Re93ny. treated oak or cypress will last hundreds of years.. you get what you pay for 0 0 How do you think about the answers? Basket Case. Thanks. Email Save Comment 7. I don't like finger joined cedar planks but check but check those out because the are way cheaper – Ed Beal Jul 20 '18 at 22:58. add a comment | 4. According to the specie, treatment, maintenance and a whole host of other influences, you can expect quality timber cladding to last anywhere between 40-60 years. However, by using the high gloss for the under coats, you achieve better UV protection. Hello! Mac . My current raised beds are made from 1″ untreated pine and last approximately 10 years. Pressure-treated wood that has been properly treated and installed for its intended end-use can be expected to last for many decades. will last being exposed to the elements.There is a neighbor down the road from me who is building his house.He has had OSB on his house for two years without any siding installed to protect it, or for that matter any housewrap either. White oak and teak are also long lasting woods that are resistant to decay, twisting, cracking, or warping. My neighbor has built stairs out of wood; if this is viable I can do the same, but I want to understand how long this design might last. 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