Floor Joist On Concrete

Eventually the concrete shrinks back and behaves similar to a post tensioned.

Floor joist on concrete.

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. Joists must exhibit the strength to support the anticipated load over a long period of time. This is probably the best option for extremely heavy floors such as pre cast planks or second story garages. The spi keystone joist system combines the long span benefits of prestressed concrete with all the advantages of a monolithically poured concrete deck.

I ve done joist on concrete and seen it done in other parts of the country but i never liked it. Reinforcement rebar or steel fibers is placed and the concrete actually expands as it cures resulting in tensioning of the steel. They help support main floors above the crawlspace. In many countries the fabrication and installation of all framing members including joists must meet building code standards.

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. Or use regular. The strongest way to install floor joists is to create a concrete ledge on the inside face of the wall. 69 chapter 4 floor construction woodframe floor systems and concrete slab on grade floors are discussed in this chapter.

To create a ledge you can use special brickledge blocks which most major manufacturers offer in common widths. Can i just lay my floor joist directly on the concrete. Our composite system is economical fast and virtually maintenance free. 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.

Crawlspace floor joist acts as a horizontal plane that runs from wall to wall wall to beam or beam to beam. Joists can also be set side by side as double joists providing incredible flexibility when trying to carry. They are usually made of concrete steel or wood. Although cold formed steel framing for floor systems also is permitted by the irc it is not covered here.

The procedure for installing a floor structure over a slab with 2 by 6 joists can be.