![]() ![]() I leave that to the unlicensed folks who have no professional license at stake. So occasionally I will offer what I believe to be factually accurate information that could be used by an individual to help with their design or installation. I only design projects when I have a contract with the person for whom I am doing the design, and I only take on a contract when I can personally visit the site. So I avoid designing projects for individuals on this site, since I would be potentially liable for the consequences of my actions, even if it were as simple as the individual misunderstood the instructions and improperly installed the beam. Additionally, I am subject to penalties for errors and omissions that do not apply to unlicensed individuals offering their opinions on chat groups such as this. As a licensed professional, I have obligations and am subject to laws and regulations that do not apply to unlicensed individuals. I have a license as a professional engineer in multiple states. Since you ask, I will tell you why the Engineer does not design the job for someone on this site. There is more to the design than simply sizing the beam, there are connection details and an analysis of the flex of the beam that should also be done at the same time the beam is evaluated for strength. Any structural engineer worth a nickel can tell you based upon an inspection of your site and a review of the loading what size beam you need, or in your case how much you can span with a specific size beam. If none of this makes any sense, let me make it a little simpler. Deflection is related to the fourth power of the span length, while maximum fiber bending stress is related to the square of the length, so neither factor scales directly with the beam moment of inertia. ![]() Maximum span is governed by the more restrictive of the deflection of the beam at the center, or the bending strength of the beam. The allowable span for a beam is governed by the moment of inertia of the beam (depends on the size of the beam), the maximum allowable fiber bending stress (depends on the type of wood and the grade), the modulus of elasticity of the material (depends on the species of wood), and the loading (dead plus live load, often governed by code). Learn More About Beam SpanNo, you cannot multiply the length by 1.5. For this reason, it’s important to calculate how many beams (and concrete footings to secure each beam) your deck will need. Your beams will need to bear the load of not only your decking materials, but additional components of the frame itself. While joists provide a horizontal support system for deck boards, beams provide support for the joists. This makes for a more attractive, unobstructed view from your front windows.Īnother benefit to steel framing is that the material is non-flammable and many insurance companies offer a discounted rate for steel deck framing.ĭeck beams and joists go hand-in-hand as the framing materials for your deck. This means there are fewer holes to dig and fewer posts to look at from the ground floor of your home. Due to their strength, fewer beams or posts are needed. Steel framing materials, are machine-made, making each beam an exact replica of the beams on either side of it. They make for a stronger, straighter, safer, and smarter alternative to wood substructures and may be more economical in the long-run. Unlike wood, steel beams are not susceptible to the elements and won’t warp over time. If you’re building a deck, wood isn’t your only option for beams. ![]() However, shipping costs for large amounts of lumber can cost almost up to five times the actual price of the lumber itself. If you have your heart set on a specific type of wood that isn’t locally available, that wood can be shipped to you via a supplier. On the flipside, Pinewoods are only available in Southern and Eastern regions of the country. Redwoods, Hem-Fir, and some of the other combination woods are not available outside of the Western part of the United States.
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