Roof Joist Spacing Uk

A clear span of 2 69m is possible using 6 x 2 at 600centres for a slate tiled roof.

Roof joist spacing uk.

Not more than 0 5 more than 0 5 but not more than 0 75 more than 0 75 but not more than 1. This is the distance between joist centres. Spacing in exterior exposure. Usually 400 450 or 600mm but any value can be used up to 610mm max.

This will support a room ceiling that is 10 feet long on one side as in 10 foot by 15 foot or 10 foot by 17 foot rooms which is a standard dimension for many rooms in residential construction. Surveyors and structural engineers utilise data from tables below to help calculate the correct size strength and centres of roof timbers for the required spans and loadings. Dead load per square metre in kn m supported by joists. When starting to space out the roof joists always start at the end of the roof.

Sixteen inch oc spacing of ceiling joists made from 2 southern pine allows for a maximum 13 inch span length. The same concept holds true for roof trusses. Live load psf dead load psf span calculator for wood joists and rafters available for the iphone. If the roof is not completely square you can decrease the space between joists but never increase the space.

A roof joist is always spaced no more than 16 inches apart from another roof joist. So the space between rafters can be greater without reducing the maximum span. Whilst you could go wider in theory with deeper rafters the spacing is limited by tiling batten span. For pitched roofs flat roofs and ceiling joists.

Common spacing for trusses on this type of building is often between 2 and 4 feet but trusses built with advanced designs may allow spacing as great as 8 or 12 feet. You could set out the joists at normal centres and cut in trimmers to create the width opening you need then pack out the sides. Measure from the ends. Centre to centre spacing of joists in mm joist size width depth mm 400 450 600 400 450 600 400 450 600.

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