However, I’m worried about tree sway – it’s a very tall tree, and if it’s bolted to the tree, even with TABs, this means it will move the tree. (My shoulder is fully recovered now from installing the TABS last summer!!) Another is to support the treehouse from the ground. You’re a great resource for us DIY folks. He is now shut down with half built treehouses and tens of thousands in extra costs – all due to arrogance and poor planning. The treehouse was constructed in the shape of an octagon with a bridge that traverses over a walking trail. Lag Screws: Performance & Mechanical Specs; Description. The plan so far is to have two main perimeter support beams on level with each other supported by TABS at each end, and then the third main perimeter beam will rest on top of the other two spaced away from the two trees it spans. I would look for a 12-20″ tree. The main thing is to use bolts or lag screws of sufficient size to ensure stability. My question is regarding the lag bolts in the trunk. What diameter lag screws did you use? They appear healthy, they appear strong but I’m not an aborist. If I were to coat the bolts in grease, or vaseline, or vegetable oil prior to insertion would that hurt the tree? Question is this. Also, the white pine is one of the softest wood species in your area, so avoid 1″ collars. The exact solution I would recommend would depend on the layout of your trees and intended building project, and the individual assessment of the health and structure of each tree. Lightning protection is available for individual trees and/or towers to protect a whole property. The standard GL® knee brace holds the wooden load out away from tree, the load is mostly in compression. ... 3/4" x 10" Hot Dipped Galvanized Lag Screws, Grade A, Quantity 10- by Fastener Depot, LLC. I would then build a platform with the flooring joists and put the treehouse on the platform about 8-10′ off of the ground. Features. One side is fixed and the other floats back and forth, which allows the tree to sway without squeaking, but still holds the beam firm enough to permit swinging. At the high end of that range, I am not comfortable suggesting lag bolts only. Lag bolts have pros & cons versus the TABs that we normally use. Does it even make sense to build them? Those are the cons. We have seen a lot of “home-made” fastening systems which are not as safe and reliable as the real thing. Is this a sign of something amiss, or is this normal growing pains as the tree adjusts to the bolts? If you are willing to maintain it, then go ahead. I have a 8×8 treehouse built about three years ago on a 30 inch diameter pinoak. I need a lot more information to give you an intelligent response. I am building a treehouse using 2 – persimmons trees. Okay, so trees heal after lag bolts run through…. Is this thing more than likely going to pull apart in the wind? Mike: That’s all important information to gather before we recommend attachment hardware. This depends on the size of the treehouse and its position in the tree. The trees he wants to use are 30″ diameter cedar trees. All … What are the shipping options for lag bolts? These mount securely into the heartwood and are suitable for very small tree houses or platforms or where they are only carrying part of the total load of the tree house. This will allow you to space the beam 2-4 inches away from the trunk, allowing room for future tree growth. Sometimes for your type & size of tree we use a double tribeam configuration, other times a number of single knee braces, and an older but effective beam & brace combo still works. I’ve researched TABs and i’ve researched using large, long lag screws (1.24″ x 12″). All lag bolts can be shipped to you at home. I have a friend who wants to build 2 Tree houses on his property in rural Colorado. The wood is very hard, which means that the tree is not the weak point – the 3/4″ bolt is. It works very well…, Hi, You could plug the hole with a tight dowel and saw flush if desired, but it has little benefit for the tree. Thanks in advance. The tree, however, is about 25 feet from our house. You are well advised to make sure that you understand how your tree house will be attached to the tree before you hire anyone to build your tree house. Thanks! I too am experiencing some growing pains and can see the beams bending a bit as well as the head of the lag bolts sinking into the beams some. These mount securely into the heartwood and are suitable for very small tree houses or platforms or where they are only carrying part of the total load of the tree house. The tree is a very mature 9.58-foot circumference poplar (or tulip) tree. Also, same as above with two lags would be … If the nails were installed at the time that the tree was 12″, and it grew to 30″ at removal, then the tissues at 12″ were heartwood or non-conductive, so further spreading or discoloration would be more likely due to decay. Now to your question – 3/4″ over a 16′ span is bad enough that a builder will notice from walking on it, but most non-builders will not. Do you have any kind of drawing or sketch? Here is the product we use: Rock Climbing Holds on Trees. Don’t bother filling with compound. Thanks. Thank you! I have a very tall red oak behind my house with a 40″ diameter trunk, I want to build a two story 14’x16′ treehouse in it. Not tree house related. Most lag bolts range from $10 to $800 in price. I will go with lag bolts. So, out of the total length or the lag screw (12") the first 7" will be inside the core of the tree, the next 2" will be inside the spacers to account for the bark and the last 3" will hang out and support the beam. For very small treehouses, suspension can work without tree penetration, but some suspension systems become problematic over time. Two 8×12 boards were attached between two trees about 10 feet apart and the platform was built on them. We have a large tree with 5 trunks in a pentagon that we plan to attach our beams to to. They are worth the money. I think you misunderstood my question. We haven’t decided on the height yet, but are thinking about 8’ high so we can reach the platform with basic ladders. So there are options… Now your larger question, does it make sense to build them… that is a topic for greater conversation. Good luck, -Dan. Is there a reason to use TAB instead of a couple 3/4″ all thread all the way through the tree (bolting 4x10s and employing V-support too.)? Thanks, Now, add the remaining floor joists at 16 inches from the center. I wouldn’t let the threat of lightning stop you. A full point is unnecessary since a pilot hole nearly as large as the root diameter o… The standard GL knee brace holds the wooden load … We only add the extra layer of beams when needed to change joist sizes or directions. Of course, any perfectly good tree still has risks, but poplars often grow larger than yours, so if the tree is healthy and structurally sound now, then it could provide a secure foundation for decades. By the way, the treehouse to the right really is out of level. We would use Treehouse attachment bolts in two parallel trees and utilize two 6×6 pressure-treated posts with 10×48-in. The Truth is that if you put a nail in a tree at 10 feet above ground, then it will always be 10 feet above ground. Hi my name is Dave. Thanks for any thoughts you have! Do the tornadoes take a similar path when they come through? Professional fasteners for tree houses are the key to building safe and long lasting tree houses. Long lasting materials such as cedar, mahogany, and pressure treated pine, allow our treehouses to last for 10, 15, and even 20+ years. So it’s common for a residential deck or living space to range from 15 – 40 pounds per square foot. Hi Dan- Or do you see many larger trees uprooted and blown over? and 2) since the hardwood growth is what is pushing against the tree house, can I simply unscrew the bolts a turn or so (the thickness of the growth ring) each year to relieve stress on the bark? My questions are: 1) does this make sense at all? We have had great luck with tulip poplars of that size. Please share more about what you are trying to achieve with the design. Dion. A pilot hole should always be drilled for lag bolts, the same size as the central core of the threaded section of the bolt. I know if you ask a lot of questions about technology it can be a red flag to your contractor, but you need to make sure that you get a safe and tree friendly treehouse for your money…. Overall, I can’t bless a specific situation over the internet like this, but most of the time, if the tree is healthy to begin with, the method you describe will damage, but not overwhelm or kill the tree. Thanks for the help! Parallel 2x12s, even doubled up, are not going to safely support a treehouse like this on a 20′ span. If it was me, either way, I’d correct the 3/4″. Should I consider attaching blocking to the underside of one of the beams to get some vertical separation of the 2 TABS in the common trunk, or does my current plan seem adequate? I made a very rough estimate that the treehouse would weigh almost 2,000 pounds, but do you think that sounds reasonable for a treehouse of that size? If it’s a backyard kids treehouse, then perhaps 90% water proof is good enough. We love the tree and love our house and don’t want to endanger either – or obviously anyone who uses the treehouse. I intend to build and A frame hut on top after this. It sounds like it would be fine for 2-5 years. The most important thing to remember when starting to build your tree house is to reduce the risk of the tree’s growth or sway factor. I’ve jumped up and down on the platform putting plenty of weight on it and it feels sturdy. I think it would be in my best interest to take advantage your engineering support. I don’t know what loads you designed to, so that might be okay for you, or it might not. There are other tricks such as offsetting the TABs with blocking, but I don’t recommend that on a single tree platform because if the tree is less than 14″ then you’re going to have some increasing rotational issues which get worse with a large ratio of platform size to trunk diameter. I have woodworking and metal working experience. I calculated the total weight of the beams, floor joists and flooring to be around 1.5 tons alone. Possibly. I have a large/mature ficus tree that I’d like to make a climbing tree for my kids. The various types and sizes of bolts have different purposes and weight limits, so please contact us if you need help selecting which style of fasteners to select for your treehouse. If cost is the only reason you’re avoiding the tabs, then ask at http://www.treehousesupplies.com if they have any scratch & dent TABs. That is so small that you’ll probably get away with it. Should I be worried? Saved by Kelly Spyker. Black or grey staining is from decay spread. I’m building several tree houses and a sky walk through the trees on some property I bought in N Idaho. If you are a welder, then go ahead and make your own brackets if you want to save a few bucks, but I recommend purchasing the TABs from . I’m confident in my ability to build the tree houses but not sure about the trees. No matter how you bolt/screw holds on, the tree will quickly grow around them. Applications: Steel, Electro-plated Zinc: For use in wood in non-corrosive environments Steel, Hot-dip Galvanized: For use in corrosive environments Stainless Steel: Has superior corrosion resistance to galvanized steel bolts. The treehouse was constructed in the shape of an octagon with a bridge that traverses over a walking trail. If you set the beams out on all thread of any size, you’re taking a terrible risk of failure. A full-bodied bolt with hex head, spaced threads and a gimlet point. To relieve load from the beam, you can lift with 2 chain hoists or come-alongs, or you may be able to lift with a couple scissor jacks made from 2x4s. Thank you for answering so many of the questions above, they give so much insight to the novice builder. Ok, i will need to get exact measurements and contact you, the location on the tree is about 30’ high so and in a woods not at my house so it may be a little bit, just plan on building a basic 6’x6’ floor with and open railing around it,either with the tree coming up through the middle or the platform hanging from one side, in which case it would only need to 4’x4’ or so. I am planning a 8′ x 12′ single story enclosed treehouse built on a triangular platform supported by 3 mature Ponderosa Pine trees approximately 12″ diameter at the platform height. Is it necessary to also purchase brackets in this instance? I have a 16 inch diameter water Oak tree with an almost vertical trunk – I live in North Florida. But if you notice a small bulge of tree growth, then loosen and/or move the strap a few inches and you’re all set. That would take me months to build. Thank you.
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