Spacing For Interior Flat Roof Joist

In other words you would space a roof joist 15 inches apart from another roof joist but never 17 inches apart.

Spacing for interior flat roof joist.

Interior spaces that exceed standard sizes such as family rooms and garages require different dimensions in the size of the joist the joist spacing and the joist span. Floor joist span use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size. Joists are the parallel horizontal beams that run across an open space joining opposite walls in a building to support both the ceiling below and the floor above. Roof rafter span use this table to determine the maximum lengths of roof rafters based on species and grade of lumber spacing dimensions load and slope.

Maximum clear span of flat roof joists in metres for sc3 timber spacing between joists size of roof joist 400mm 450mm 600mm 47 x 97 1 84 1 81 1 74 47 x 120 2 43 2 39 2 27 47 x 145 3 08 3 02 2 87 47 x 170 3 75 3 67 3 42. In these cases 2 inch by 10 inch lumber is often used for ceiling joists although trusses may be more practical. They are nominally 2 inches thick actual width usually 1 1 2 inches and come in a variety of widths from 8 to 12 inches. Measure from the ends.

Spacing in exterior exposure. Live load psf dead load psf span calculator for wood joists and rafters available for the iphone. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. A roof joist is always spaced no more than 16 inches apart from another roof joist.

The tables below give maximum spans for rafters and beams. Ceilings and roofs excluding trussed rafter roofs for dwellings or ask your lbc surveyor for advice. Manufacturer of viperstud framerite studrite genieclip and joistrite. Code of practice for permissible stress design materials and workmanship and bs 5268 7 2 1989 structural use of timber section 7 2.

Span calculator for wood joists and rafters also available for the. The figures are based on quality materials. We offer a complete line of cold formed steel framing products like metal stud framing rc channel metal floor joists metal lath and metal corner bead. If the roof is not completely square you can decrease the space between joists but never increase the space.