Flat Roof Joist Sizes

As you may imagine there is a fair amount of weight involved here in terms of boards felt etc.

Flat roof joist sizes.

1 ft 0 3048 m. These welded steel products are used to support a building s roof and floors. For example you can span a 1 grade no knots southern yellow pine a greater distance than a 2 grade with knots southern yellow pine. Size of joists mm clear span c16 joist m clear span c24 joist m 47 x 95 47 x 120 47 x 145 47 x 170 47 x 195 47 x 220 1 77 2 40 2 89 3 38 3 87 4 36 2 04 2 75 3 47 4 20 4 93 5 66 floor joists flat roof joists assumptions at 400mm centers supporting permanent load excluding self weight of joists up to 50kg m2.

1 psf lb f ft 2 47 88 n m 2. Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no. This is the distance between joist centres. The lengths and sizes of joists vary depending on the species and quality of the lumber used.

The range of joist sizes used in homes varies though between 2 by 4 inches and 2 by 12 inches. Rafter and joist span faq. Usually 400 450 or 600mm but any value can be used up to 610mm max 1 2 timber strength class and joist size automatically calculate sizes suitable for supporting the loads below. These joists easily handle spans that wood systems cannot handle while their lightweight construction makes them much less costly than steel beams.

K series joists range in depth from 10 to 30 and can span up to 60. 2 are indicated below. Dead load weight of structure and fixed loads 15 lbs ft 2. Live load is weight of furniture wind snow and more.

Sizes of joists needed for flat roof construction. Old asbestos roofs are often replaced with flat roofs. Standard size of joists though there is no standard joist size for the ceilings in all buildings most average homes use ceiling joists in a board size of 2 by 6 inches.