Spacing For Interior Flat Roof Joist

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.

Spacing for interior flat roof joist.

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. Span calculator for wood joists and rafters also available for the. 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. If the roof is not completely square you can decrease the space between joists but never increase the space.

In these cases 2 inch by 10 inch lumber is often used for ceiling joists although trusses may be more practical. In other words you would space a roof joist 15 inches apart from another roof joist but never 17 inches apart. Spacing in exterior exposure. 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.

In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. Floor joist span use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size. Live load psf dead load psf span calculator for wood joists and rafters available for the iphone. Joists are traditionally made from timber.

The figures are based on quality materials. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. Measure from the ends. Boarding to be fastened on top of flat roof joists with a depth to width ratio greater than 4 the allowable clear spans have been calculated in accordance with bs 5268 2 2002 structural use of timber part 2.

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. 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. Ceilings and roofs excluding trussed rafter roofs for dwellings or ask your lbc surveyor for advice.