Wood beam span tables

Span Tables Use the span tables below to determine allowable lengths of joists and rafters, based on size and standard design loads. The numbers in gray indicate the distance between the support posts. Span Tables for Joists and Rafters (Figure 5) gives a required compression value of 2psi for a span of feet and bearing length of 1. AITC Beam Capacity Tables.

Table specifications are provided with each table indicating conditions and assumptions used to calculate the loads. These tables are provided as a guideline. Listed are tables based on common loading conditions for floor joists, ceiling joists and rafters.

Using Floor Beam Span Tables. What is a span table? Continuing on from Part 2: Wood Joist Span Tables of Residential Structural Design, we were just about to make our example house wider. Once we go beyond the allowable spans for floor joists (as shown in the floor joist span tables ), we will need some kind of support under these floor joists. Limited to span in inches divided by 360.

Strength - Live load of psf plus dead load of psf determines the required bending design value. Anything 5′ and above we always at least double cripple. On longer spans the beam may require much more bearing space as indicated by this table. Beams of more than one ply must be fastened together with either nails or bolts.

APA – Provides span tables for APA structural use panels. American Wood Council – Offers a range of span tables. Western Wood Products Association – Provides the Western Lumber Span Tables book in digital format.

Southern Pine Council – Provides a range of span tables for southern pine joists and rafters. ENGINEERED WOOD PRODUCTS (EWP) LVL SPAN AND SIZE CHARTS. Floor Joist Span Tables for various Sizes and Species of Wood. Framing span tables for all types of wood construction, not just decks, are given separately. Deck beam span table.

APA Performance Rated I-joists (PRIs) are manufactured in accordance with PRI-40 Performance Standard for APA EWS I-joists , Form X720. This Performance Standard provides an easy-to-use table of allowable spans for applications in residential floor construction, allowing designers and builders to select and use I-joists from various member manufacturers using just one set of span. Beam Span Calculator For help, simply click on the beside the section you need help with, watch this Tutorial Video. Includes span tables for all load bearing locations and the number of jack studs. These charts are for pound per square foot snow load on the roof.

The table includes spans for common lumber species used for deck framing like southern pine, Douglas fir, hem-fir, redwoo western cedar and other species. A tutorial for using the span tables is also available. Strongbacks must be installed at mid- span to achieve the maximum spans indicated for the vibration criterion in section 9. National Building Code of Canada (NBC). Wood framing is the material of choice for residential construction and continues to increase its market share in non-residential construction. Wood frame construction relies on the lumber design values and allowable span tables published in building codes and standards, and industry technical publications.

There are tables for stress rated lumber that show allowed sizes. The figures are based on quality materials. For lesser grades, spans should be shorter. Keep in mind that these are maximums—in other words, shortening spans slightly will result in a more solid structure.

The distance your joists can safely cantilever or overhang a drop beam is determined by the size of the joists, the wood type and grade of the lumber and the spacing between joists. Many building departments limit joist cantilevers to maximum. You must use at least five framing nails to attach the rim joist to the ends of your joists.