Spacing For Interior Flat Roof Joist

Manufacturer of viperstud framerite studrite genieclip and joistrite.

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. Measure from the ends. 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. 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.

A roof joist is always spaced no more than 16 inches apart from another roof joist. Live load psf dead load psf span calculator for wood joists and rafters available for the iphone. Floor joist span use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size. The figures are based on quality materials.

In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. If the roof is not completely square you can decrease the space between joists but never increase the space. 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. The tables below give maximum spans for rafters and beams.

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. Code of practice for permissible stress design materials and workmanship and bs 5268 7 2 1989 structural use of timber section 7 2. In other words you would space a roof joist 15 inches apart from another roof joist but never 17 inches apart. Ceilings and roofs excluding trussed rafter roofs for dwellings or ask your lbc surveyor for advice.

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. Spacing in exterior exposure. 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. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements.