Roof Truss Span Tables Uk

Surveyors span tables for designing roof rafters.

Roof truss span tables uk.

Check out the benefits of roof trusses and find a licensed mitek fabricator. These steel joints are needed to support the overall truss. Alpine truss designs are engineered to meet specific span configuration and load conditions. Roof trusses mitek manufactures the steel connector plates used in roof trusses.

Rafter span tables use these two tables for roof rafters with a slope of 3 in 12 or less. Design manufacture and nationwide supply of bespoke roof trusses and metal web floor joists for over 25 years. The following tables give details of the allowable spans and spacing for some of the more common timber sizes used in traditional roofing construction. The shapes and spans shown here represent only a fraction of the millions of designs produced by alpine engineers.

All the figures are based on roofing tiles or slates laid on timber laths over sarking felt. The same thing is true for the bridge of the truss. Span tables for flat roof joists to bs 5268 7 2 imposed loads of 0 75 kn m for maintenance and snow load are applicable where there is no permanent access no fixed ladder or staircase and most areas where the altitude does not exceed 100 metres refer to bs 6399 3. 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.

Posi rafters posi rafters combine the lightness of timber and strength of posi strut steel webs to provide a quality roof system that can span further than alternative timber products. Use these two tables for roof rafters with a slope greater than 3 in 12. Trada eurocode 5 span tables 3rd edition bs 8103 3 7 2 3 design of pitched roofs the sizing and spacing of members shall ensure structural stability and provide restraint to the structure without undue movement or distortion. The more complex the truss framework is the greater quantity of these joints will be required.

For pitched roofs flat roofs and ceiling joists. The above spans are based on american softwood lumber standard sizes. Total load psf duration factor live load psf roof type 55 1 15 40 snow shingle 55 1 15 30 snow tile 47 30 snow 40 20 snow 1 25 20.