Wood joist span table

What is a span table? Span Tables Use the span tables below to determine allowable lengths of joists and rafters, based on size and standard design loads. Span Calculator for Wood Joists and Rafters also available for the Android OS. These tables can also be used to determine deck joist span.

The spans are based on simple-span joists. Span Tables for Jois ts and Rafters American Wood Council Span Tables for Joists and Rafters American Wood Council DESIGN CRITERIA: Deflection - For psf live load. The maximum span is measured o. Limited to span in inches divided by 360. Deck beam span table. Framing span tables for all types of wood construction, not just decks, are given separately.

Simplified maximum span tables for selected visual and mechanical grades of Southern Pine lumber in sizes 2×thru 2×12. Listed are tables based on common loading conditions for floor joists , ceiling joists and rafters. Until a few years ago, the IRC didn’t have deck joist span tables. 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.

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 tables. SPAN TABLES FOR JOISTS AND RAFTERS AMERICAN WOOD COUNCIL Table 9. Required compression perpendicular to grain design values (F c⊥) in pounds per square inch for simple span joists and rafters with uniform load. Bearing Length, in. For each application, a PDF download is available.

These span tables assume installation of at least three joists or rafters that are spaced not more than on center. The calculated spans assume fully supported members, properly sheathed and nailed on the top edge of the joist or rafter. Straight-line interpolation shall be permitted for intermediate spans and design values. Use the joist span and spacing calculator below to plug in your desired type of wood , the size of your joists , and the required spacing between each joist.

Important Notes on Span Tables : Spans are based on uniformly loaded joists and include allowances for repetitive use members. Additional dead loads are due to various combinations of construction materials. Live loads of psf assumed. Do not install them upside down.

For example 2xmaterials can usually span 24” without any noticeable deflection and still support a significant load. Select your decking material. To use the joist span calculator below, first select the species of lumber you will use for your construction project from the drop-down list. Next use the buttons in the table to select the maximum length in feet (or metres in brackets) that your floor joists must span. Joist span refers to the measurement covered by the joist between supporting structures, such as beams or foundation walls.

Builders generally use pre-calculated tables to tell them appropriate joist spans for each lumber species, size, and spacing. Grade of Douglas fir are indicated below. AITC Capacity Tables provide the uniformly distributed load that a glued laminated timber beam can support based on beam size, span and material properties. Maximum floor joist span for No.

Table specifications are provided with each table indicating conditions and assumptions used to calculate the loads. In typical deck construction, with a ledger on one side of the joist and beam on the other, the size of the joists is driven by the size of the deck and based on the general maximum spans mentioned above. For best , refer to our wood and composite deck joist span table.