Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. You can also use the Wood Beam Calculator from the American Wood Council website to determine maximum rafter and joist lengths.
There are six choices.
Wood ceiling joist span table. Fill any defects or nail holes with wood putty. App to quickly determine ALLOWABLE SPANS for wood rafters ceiling joists and floor joists — similar to the span tables of 20062009 International Building Code IBC. Deflection – For 30 psf live load.
If this is the case with your structure use the Floor Joist Table to determine maximum joist lengthload. TECHNICAL DIAGRAM ON PAGE 35 30mm M. BCI Joists are specially constructed I-joists with flanges made from strong VERSA-LAM laminated veneer lumber with oriented stranded board webs and approved waterproof structural adhesives providing outstanding strength and durability.
These span tables are the equivalent of other industry-standard span tables and are calculated to the same standards. Span Calculator for Wood Joists and Rafters also available for the Android OS. The minimum bearing length is 1 ½ spans values in bold indicate that web stiffeners are required at the OSB end panel.
Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. For example the highlighted cell below shows that a 2 x 6 Southern Yellow Pine joist with a grade of 2 and spaced 24 apart can have a maximum span of 10 feet – 0 inches 10-0 if you are designing your structure to support a plaster ceiling. Click on a span to generate a full calculation you can adjust the exact span.
Span Tables F7 Rafters A maximum roof pitch of 25 degrees is assumed. Of bearings and is based on uniformly loaded joists. Internal Floor Joists F7 42mm 30 Deck Joists F7 42mm 31 Deck Bearers F7 32.
Strength – Live load of 30 psf plus dead load of 10 psf determines the required bending design value. We have engineered this calculator to provide spans which will produce a solid built house with no bounce in the floors or any swags in the ceiling. The spans for joists according to the code is far more than we find acceptable.
TABLE R8024 1 CEILING JOIST SPANS FOR COMMON LUMBER SPECIES Uninhabitable attics without storage live load 10 psf LD 240 CEILING JOIST SPACING inches. This span table is to the format and methodology given in BS 5268-73. These spans were calculated using our ceiling joist calculation engine.
Also available for the Android OS. It covers 2 common lumber species and sizes at 20 pounds per square foot load. It covers 2 common lumber species and sizes at 20 pounds per square foot load.
The maximum span is measured oc. Engineered Wood Products EWP Span and Size Charts for BCI Joists. Limited to span in inches divided by 360.
For other grades and species and for other loading conditions refer to the AWC STJR. Span Tables for Jois ts and Rafters American Wood Council 4 Span Tables for Joists and Rafters American Wood Council DESIGN CRITERIA. This ceiling joist span table is based on the 2012 IRC for uninhabitable attics with limited storage.
The spans are based on simple-span joists. Sand to an even finish and spot prime to all affected areas. Spans for ceiling joists shall be in accordance with Tables R8024 1 and R8024 2.
The tables permit a bearing length of up to 35 inches but since 15 is probably the worst case that youll encounter for joist or rafter bearing its a safe value. Joists Rafters Simplified maximum span tables for selected visual and mechanical grades of Southern Pine lumber in sizes 24 thru 212. Table 91 in Span Tables for Joists and Rafters Figure 5 gives a required compression value of 237 psi for a span of 16 feet and bearing length of 15 inches.