Floor Joist On Concrete

The strongest way to install floor joists is to create a concrete ledge on the inside face of the wall.

Floor joist on concrete.

Reinforcement rebar or steel fibers is placed and the concrete actually expands as it cures resulting in tensioning of the steel. That would not be allowed in my area and they use the minimum height in crawlspace to enforce it with the local requirement being 36 inches. While some floors are built directly on a concrete slab those built above open areas such as crawl spaces basements and lower floors almost always use a floor joist system to provide weight bearing support for flooring furniture people and everything else in your home. The spi keystone joist system combines the long span benefits of prestressed concrete with all the advantages of a monolithically poured concrete deck.

Shrinkage compensating concrete type k with an experienced contractor and designer can allow a reduction or elimination of joints. Building a framed wood floor over an existing concrete slab can provide the space needed for electric wiring heat venting plumbing drain lines and added insulation when remodeling a basement or garage space. Rather the reader is referred to the aisi standard for cold formed steel framing prescriptive method for one and two family dwellings aisi 2001 for guidance. Although cold formed steel framing for floor systems also is permitted by the irc it is not covered here.

They help support main floors above the crawlspace. Can i just lay my floor joist directly on the concrete. Joists can also be set side by side as double joists providing incredible flexibility when trying to carry. I ve done joist on concrete and seen it done in other parts of the country but i never liked it.

They are usually made of concrete steel or wood. Crawlspace floor joist acts as a horizontal plane that runs from wall to wall wall to beam or beam to beam. To create a ledge you can use special brickledge blocks which most major manufacturers offer in common widths. This is probably the best option for extremely heavy floors such as pre cast planks or second story garages.

69 chapter 4 floor construction woodframe floor systems and concrete slab on grade floors are discussed in this chapter. Or use regular. Eventually the concrete shrinks back and behaves similar to a post tensioned. Joists must exhibit the strength to support the anticipated load over a long period of time.

Considering the cross section of a typical joist the overall depth of the joist is critical in establishing a safe and stable floor or ceiling system.