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INTRODUCTION The simplified span tables which appear in this booklet have been prepared by the Pacific Lumber Inspection Bureau to facilitate the use and specification of selected imported softwood species in common joist and rafter installations for light frame construction.
The charts we provide in this article show typical lumber dimensions for softwood, hardwood, and plywood (which can be made of softwood, hardwood, or a combination of both). They also list nominal sizes alongside actual dimensions, giving you everything you need to do all your calculations before you head to the store.
The table below provides some common North American Lumber nominal sizes and their equivalent actual size. For example, 1x8 actual size is 3/4" x 7-1/4", and 2 x 12 actual size is 1-1/2" x 11-1/4", and 2x 10 actual size is 1-1/2" x 9-1/4".
Do you want to know why a 2x4 is not actually 2" by 4"? This post will explain the difference between actual and nominal lumber dimensions.
3 Μαΐ 2023 · The lumber is usually identified by the measurements of the green lumber before it was cut and dried, such as 2×4, 2×6, or 2×10. Find the actual size of different types of lumber and learn why the actual size of dimensional lumber is smaller than the nominal size.
Lumber Spans Quick Reference Card (U.S.) Author: Weyerhaeuser Subject: Handy card that lists floor, ceiling and rafter spans for Framer Series lumber, as compared to SYP and SPF. Created Date: 9/26/2018 12:32:11 PM
Use the span tables in the links below to determine the maximum allowable lengths of joists and rafters. These tables provide maximum spans for the #2 grades of four common species of lumber (Southern Pine, Douglas Fir, Hem-fir, and Spruce-pine-fir (SPF).
