They are composed of a top and bottom flange (usually a 2×4) with a piece of plywood or OSB fixed perpendicular in between. Wood I-joists (sometimes called TJI’s) resemble steel I-beams. This is important when you or a fireman is depending on them to hold weight. One major advantage is that solid sawn joists will last longer during a fire. Using younger trees often results in warped or bowed wood. These joists are contiguous boards created from old growth trees- a supply which is quickly being exhausted. If you’d like to learn more, try out this handy calculator that lets you enter all the necessary details.įrom an environmental perspective, solid lumber joists are expensive. Span distances depend on several factors including wood species, board size, spacing and acceptable deflection. Initial costs for solid lumber joists are (usually) cheaper than engineered solutions but this benefit is cancelled out by the costs associated with limited span distances and increased framing members. They were the default for some time, but in the early ’90s builders started using engineered products more and more. Traditional solid lumber joists are still very common. Several popular options include solid lumber, LVL, wood I-beams, steel joists and open web floor trusses. Joists are horizontal supports that span from wall to wall, wall to beam, or beam to beam. We hope you’ll add to the conversation in the comments section below. We are re-publishing it with updated information and additional perspective from spending more time on job sites. In this article, I’ll review a few different types of joists, and you can decided if they’re important to you too.Įditor’s note: This article originally ran in 2008. You might think it’s strange, but joists can impact lots of things like floor plan, fire safety, what materials can be installed for flooring surfaces, and even indoor air quality. For instance, I like to check out the type of floor joists in my friends’ homes.
It’s funny the different things people notice about a house.
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