Residential Concrete Floor On Joists

This has decreased costs and also contributed to concrete floors popularity.

Residential concrete floor on joists. Unlike softwood joists timber i joists do not warp over time providing a quiet floor while open metal web joists can provide an easy means of installing services. While most residential construction uses 2x8 joists with 16 inch spacing there are many other factors you need to consider when determining the proper joist span length. For more than 30 years a system based on welded steel bar joists has been popular because of its flexibility and efficient use of labor and. The procedure for installing a floor structure over a slab with 2 by 6 joists can be.

Joist span and spacing is set by your local building code. Using floor joist span tables. Some newer homes have manufactured i beam shaped joists. Floor joists are typically 2 by 8s 2 by 10s or 2 by 12s.

If you have a concrete slab floor the slab may be considered the subfloor. The latter options are more expensive but provide considerable benefits. Don t worry you won t need to do a lot of calculations in determining the size and placement of the structural framing within your house design. Section r502 10 of the international residential code states that header joists can be the same size as the floor joists when the header joist span isn t greater than 4 feet but if the header joist span is more than 4 feet you ll need to double the header joist and ensure that it s capable of.

Additional support for the floor joists is achieved by nailing the ends of the joists into headers. Continuing on from part 1. However some newer systems have been developed with lighter residential construction in mind. This sample table gives minimum floor joist sizes for joists spaced at 16 inches and 24 inches on center o c for 2 grade lumber with 10 pounds per square foot of dead load and 40 pounds of live load which is typical of normal residential construction.

The span table for a 30 psf live load 10psf dead load floor indicates a required fb value of 1 315 and a minimum e value of 1 800 000. When building a house or even a deck it is important to confirm you have the correct joist sizes spans and spacing before you get started. In the example the joists have a spacing of 16 inches and a span of 11 feet 2 inches. Ceiling joists are usually 2 by 6s or sometimes 2 by 4s if it is an older home.

Typically made of plywood or osb and ranging in thickness from 19 32 to 1 1 8 thick the subfloor is truly structural second only to joists in this respect. 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. Next consult a span table to cross reference the spacing and span to find the required fb value for that table s load limits. Residential structural design vertical structural forces we were about to start learning about floor joist span tables.

Composite steel bar joists.