See Tables 1 and 2 for visually graded lumber species and lumber species combinations and assigned specific gravity per the National Design Specification (NDS) for Wood Construction. Assigned specific gravity in the NDS is an average property based on weight and volume when oven-dry. Bold entries are commonly available lumber species combinations used in International…
A variety of Span Table Documents and Span Calculator products are available for use in wood building design, complete with a tutorial for their use. The online AWC Span Calculator performs calculations for ALL species and grades of commercially available softwood and hardwood lumber as found in the NDS Supplement. There are also several other online span tables available for…
The National Design Specification® (NDS®) Supplement tables list design values for 2x and larger decking. The American Lumber Standards Committee (ALSC) provides a Policy for Evaluation of Recommended Spans for Span Rated Decking Products. Here’s more information on their website: https://alsc.org/lumber-recommended-spans-for-decking/ You will need to contact the specific grading agencies to obtain their span ratings for various species. A…
The National Design Specification® (NDS®) Supplement tables list design values for 2x and larger decking. The American Lumber Standards Committee (ALSC) provides a Policy for Evaluation of Recommended Spans for Span Rated Decking Products. Here’s more information on their website: https://alsc.org/lumber-recommended-spans-for-decking/ You will need to contact the specific grading agencies to obtain their span ratings for various species. A…
The National Design Specification® (NDS®) Supplement tables list design values for 2x and larger decking. The American Lumber Standards Committee (ALSC) provides a Policy for Evaluation of Recommended Spans for Span Rated Decking Products. Here’s more information on their website: https://alsc.org/lumber-recommended-spans-for-decking/ You will need to contact the specific grading agencies to obtain their span ratings for various species. A…
Timber tongue and groove decking is a specialty lumber product, constituting an important part of modern timber construction, that can be used for many applications to provide an all-wood appearance. Nominal three and four inch decking is especially well adapted for use with glued laminated arches and girders and is easily and quickly erected. This document contains all that’s needed to design and construct tongue and groove wood roof decking, including span and load tables.
The plank-and-beam method for framing floors and roofs has been used in heavy timber buildings for many years. The adaptation of this system to residential construction has raised many technical questions from designers and builders concerning the details of application.
Generic Load tables for wood beams and wood columns and generic span tables for high capacity floor joists and for plank and laminated floors and roofs.