Building control guidance note subject ceilings and flat roofs timber sizes and construction details 09 issued 01 04 13 rev page 1 of 2 the following tables give details of the allowable spans and spacing for some of the more common timber sizes used in ceiling and flat roof construction.
Roof joist span tables building regs 2019.
Surveyors span tables for designing roof rafters.
For pitched roofs flat roofs and ceiling joists.
Floor joist span tables for surveyors floor construction.
Timber floor joists shall be adequate for the spans and loads and be correctly installed.
Where the tables do not apply or where there are concentrated loads floor joists should be designed by an engineer in accordance with technical requirement r5.
Span calculator for wood joists and rafters also available for the android os.
Surveyors and structural engineers use data from tables below to help calculate the size of timbers necessary to give adequate support to timber floors.
Solid timber joist sizes are provided in the bs 8103 3 span tables.
Fire safe construction 3 floor performance and tj pro rating 4 5 section 1.
For other grades and species and for other loading conditions refer to the awc stjr.
Spans for ceiling joists shall be in accordance with tables r802 4 1 and r802 4 2.
Also available for the android os.
This is an abridged representation of building regulations table a1.
Trus joist tji joist specifier s guide tj 4000 july 2019.
These span tables apply only to flat roof and roof with a slope of up to 10 degrees.
9 16 tji joists design properties 6 floor span and load tables 7 8 tips for preventing floor noise 8 allowable holes 9 cantilevers 10 11 roof span and load tables 12 13 framing.
Table r802 4 1 ceiling joist spans for common lumber species uninhabitable attics without storage live load 10 psf l δ 240.