2308.7.1 Ceiling joist spans.
BC § 2308.7.1
Spans for ceiling joists shall be in accordance with Table 2308.7.1(1) or 2308.7.1(2). For other grades and species, and other loading conditions, refer to the AWC STJR. Table 2308.7.1(1)Ceiling Joist Spans for Common Lumber Species(Uninhabitable Attics Without Storage, Live Load = 10 psf, L/Δ = 240) Ceiling Joist Spacing (inches)Species and GradeDead Load = 5 psf2 × 42 × 62 × 82 × 10Maximum ceiling joist spans(ft.-in.)(ft.-in.)(ft.-in.)(ft.-in.)Ceiling Joist Spacing (inches)Species and GradeDead Load = 5 psf2 × 42 × 62 × 82 × 10Maximum ceiling joist spans(ft.-in.)(ft.-in.)(ft.-in.)(ft.-in.)12Douglas Fir-LarchSS13-220-8Note aNote aDouglas Fir-Larch#112-819-11Note aNote aDouglas Fir-Larch#212-519-625-8Note aDouglas Fir-Larch#310-1015-1020-124-6Hem-FirSS12-519-625-8Note aHem-Fir#112-219-125-2Note aHem-Fir#211-718-224-0Note aHem-Fir#310-1015-1020-124-6Southern PineSS12-1120-3Note aNote aSouthern Pine#112-519-625-8Note aSouthern Pine#211-1018-824-7Note aSouthern Pine#310-114-1118-922-9Spruce-Pin e-FirSS12-219-125-2Note aSpruce-Pin e-Fir#111-1018-824-7Note aSpruce-Pin e-Fir#211-1018-824-7Note aSpruce-Pin e-Fir#310-1015-1020-124-616Douglas Fir-LarchSS11-1118-924-8Note aDouglas Fir-Larch#111-618-123-10Note aDouglas Fir-Larch#211-317-823-0Note aDouglas Fir-Larch#39-513-917-521-3Hem-FirSS11-317-823-4Note aHem-Fir#111-017-422-10Note aHem-Fir#210-616-621-9Note aHem-Fir#39-513-917-521-3Southern PineSS11-918-524-3Note aSouthern Pine#111-317-823-4Note aSouthern Pine#210-916-1121-725-7Southern Pine#38-912-1116-319-9Spruce-Pin e-FirSS11-017-422-10Note aSpruce-Pin e-Fir#110-916-1122-4Note aSpruce-Pin e-Fir#210-916-1122-4Note aSpruce-Pin e-Fir#39-513-917-521-319.2Douglas Fir-LarchSS11-317-823-3Note aDouglas Fir-Larch#110-1017-022-5Note aDouglas Fir-Larch#210-716-721-025-8Douglas Fir-Larch#38-712-615-1019-5Hem-FirSS10-716-821-11Note aHem-Fir#110-416-421-6Note aHem-Fir#29-1115-720-625-3Hem-Fir#38-712-615-1019-5Southern PineSS11-017-422-10Note aSouthern Pine#110-716-822-0Note aSouthern Pine#210-215-719-823-5Southern Pine#38-011-914-1018-0Spruce-Pin e-FirSS10-416-421-6Note aSpruce-Pin e-Fir#110-215-1121-025-8Spruce-Pin e-Fir#210-215-1121-025-8Spruce-Pin e-Fir#38-712-615-1019-524Douglas Fir-LarchSS10-516-421-7Note aDouglas Fir-Larch#110-015-920-124-6Douglas Fir-Larch#29-1014-1018-922-11Douglas Fir-Larch#37-811-214-217-4Hem-FirSS9-1015-620-5Note aHem-Fir#19-815-219-723-11Hem-Fir#29-214-518-622-7Hem-Fir#37-811-214-217-4Southern PineSS10-316-121-2Note aSouthern Pine#19-1015-620-524-0Southern Pine#29-313-1117-720-11Southern Pine#37-210-613-316-1Spruce-Pin e-FirSS9-815-219-1125-5Spruce-Pin e-Fir#19-514-918-922-11Spruce-Pin e-Fir#29-514-918-922-11Spruce-Pin e-Fir#37-811-214-217-4 Check sources for availability of lumber in lengths greater than 20 feet. For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479 kPa. a. Span exceeds 26 feet in length. Table 2308.7.1(2)Ceiling Joist Spans for Common Lumber Species(Uninhabitable Attics With Limited Storage, Live Load = 20 psf, L/Δ = 240) Ceiling Joist Spacing (inches)Species and GradeDead Load = 10 psf2 × 42 × 62 × 82 × 10Maximum ceiling joist spans(ft.-in.)(ft.-in.)(ft.-in.)(ft.-in.)Ceiling Joist Spacing (inches)Species and GradeDead Load = 10 psf2 × 42 × 62 × 82 × 10Maximum ceiling joist spans(ft.-in.)(ft.-in.)(ft.-in.)(ft.-in.)12Douglas Fir-LarchSS10-516-421-7Note aDouglas Fir-Larch#110-015-920-124-6Douglas Fir-Larch#29-1014-1018-922-11Douglas Fir-Larch#37-811-214-217-4Hem-FirSS9-1015-620-5Note aHem-Fir#19-815-219-723-11Hem-Fir#29-214-518-622-7Hem-Fir#37-811-214-217-4Southern PineSS10-316-121-2Note aSouthern Pine#19-1015-620-524-0Southern Pine#29-313-1117-720-11Southern Pine#37-210-613-316-1Spruce-Pin e-FirSS9-815-219-1125-5Spruce-Pin e-Fir#19-514-918-922-11Spruce-Pin e-Fir#29-514-918-922-11Spruce-Pin e-Fir#37-811-214-217-416Douglas Fir-LarchSS9-614-1119-725-0Douglas Fir-Larch#19-113-917-521-3Douglas Fir-Larch#28-912-1016-319-10Douglas Fir-Larch#36-89-812-415-0Hem-FirSS8-1114-118-623-8Hem-Fir#18-913-516-1020-8Hem-Fir#28-412-816-019-7Hem-Fir#36-89-812-415-0Southern PineSS9-414-719-324-7Southern Pine#18-1114-017-920-9Southern Pine#28-012-015-318-1Southern Pine#36-29-211-614-0Spruce-Pin e-FirSS8-913-918-123-1Spruce-Pin e-Fir#18-712-1016-319-10Spruce-Pin e-Fir#28-712-1016-319-10Spruce-Pin e-Fir#36-89-812-415-019.2Douglas Fir-LarchSS8-1114-018-523-4Douglas Fir-Larch#18-712-615-1019-5Douglas Fir-Larch#28-011-914-1018-2Douglas Fir-Larch#36-18-1011-313-8Hem-FirSS8-513-317-522-3Hem-Fir#18-312-315-618-11Hem-Fir#27-1011-714-817-10Hem-Fir#36-18-1011-313-8Southern PineSS8-913-918-223-1Southern Pine#18-512-916-218-11Southern Pine#27-411-013-1116-6Southern Pine#35-88-410-612-9Spruce-Pin e-FirSS8-312-1117-121-8Spruce-Pin e-Fir#18-011-914-1018-2Spruce-Pin e-Fir#28-011-914-1018-2Spruce-Pin e-Fir#36-18-1011-313-824Douglas Fir-LarchSS8-313-017-120-11Douglas Fir-Larch#17-811-214-217-4Douglas Fir-Larch#27-210-613-316-3Douglas Fir-Larch#35-57-1110-012-3Hem-FirSS7-1012-316-220-6Hem-Fir#17-610-1113-1016-11Hem-Fir#27-110-413-116-0Hem-Fir#35-57-1110-012-3Southern PineSS8-112-916-1021-6Southern Pine#17-811-514-616-11Southern Pine#26-79-1012-614-9Southern Pine#35-17-59-511-5Spruce-Pin e-FirSS7-812-015-1019-5Spruce-Pin e-Fir#17-210-613-316-3Spruce-Pin e-Fir#27-210-613-316-3Spruce-Pin e-Fir#35-57-1110-012-3 Check sources for availability of lumber in lengths greater than 20 feet. For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479 kPa. a. Span exceeds 26 feet in length.
