Ground Floor Joist Detail

Floor members joists beams and headers are sized to limit bending technically called deflection under dead loads of 10 to 20 pounds per square foot of floor area and live loads of 30 lb ft for bedrooms or 40 lb ft for living areas.

Ground floor joist detail.

Alternatively you can download a free viewer by visiting this link and downloading the dwg trueview application. While most wood and synthetic decking installed perpendicular to the joists can span 24 inches some kinds require joists to be as close as 12 inches on center when the decking is installed at an angle. For 2 1 2 and 3 1 2 flange widths toe nails may be used. If you don t have autocad you will need to sign up for a free account and use autodesk viewer a web based applications.

With this application support beams are attached to either side of the weakened joist and placed on concrete or steel pilasters. Floor joists a floor s framework is made up mostly of wooden joists that run parallel to one another at regular intervals. Installation guide for floor and roof framing with tji 110 210 230 360 and 560 joists spanish version weyerhaeuser also provides trus joist floor installation videos on our website or weyerhaeuser s channel on youtube. Irctable r502 3 3 2 addresses cantilever joists supporting an exterior balcony.

Pry the floor joist from the subfloor with the back of your hammer. Ceiling joists are usually 2 by 6s or sometimes 2 by 4s if it is an older home. This helps to restore the floor to a level angle while also taking pressure off the weak joist. Attach rim joist to top plate per 1a pri rim joist per 1a attach rim joist to floor joist with one nail at top and bottom.

Nail must provide 1 inch minimum penetration into floor joist. Then use pry bars and your reciprocating saw to pry and cut the floor joist away from the subfloor. Keep in mind that joist spacing may be dictated by the type of decking boards to be installed and how they are to be laid out. This is particularly true with deck joists or floor joists when there is an adequate crawl space under the flooring.

Where the tables do not apply or where there are concentrated loads floor joists should be designed by an engineer in accordance with technical requirement r5. Below are some literature links for framing details. When floor joists cantilever beyond a support joist size and spacing are limited by prescriptive tables inircchapter 5. Timber floor joists shall be adequate for the spans and loads and be correctly installed.

This will create a weak spot. Here you can view and download individual floor and roof details for your use. The details on this site are recommended for all i joists. Irctable r502 3 3 1 addresses support of a roof and one story of wall for roof spans up to 40 feet and snow loads up to 70 psf.

Start by cutting out a small 1 2 in 2 5 5 1 cm section of the floor joist with a reciprocating saw. Some newer homes have manufactured i beam shaped joists.