Roof Thickness Uk

360 mm general truss information.

Roof thickness uk.

Achieving a u value of 0 20w m meaning your roof will be better insulated than your walls will need 120mm thickness of rigid foam or 200mm of mineral wool or natural insulation. Hitting amazing levels of 0 13w m will need 300mm of mineral wool or 180mm of rigid foam. A minimum thickness of 18mm these will be able to span up to 600mm. Member size grade tc 1 4 4 7 97 tr26 bc 6 10 72 tr26 bc 10 2 72 tr26 wb 3 8 5.

0 524 kn m ceiling dead load. The thicknesses are listed below. Double nailed at each joist. Laid with staggered joints.

Other types of shingles including number 1 wood cedar shake and tile are thicker although the thickness depends upon the individual brand of shingles you select. 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. Standard asphalt shingles add very little thickness to the roof because a standard three tab shingle is about 3 16 inch thick. Plywood for a roof deck should be of marine grade and suitable for external use to bs en 636 or a bond class 2 or better complying with bs en 314 check.

Surveyors span tables for designing roof rafters. For example 10mm polycarbonate weighs around 4 5kg per square metre. Plywood boards used for the deck should be. 600 timber thickness mm.

0 785 kn m snow load. Standard roof truss general load settings. Roof pitch between 30 and 45 degrees strength class c24 size of purlins in mm maximum clear span 1 5m maximum clear span 1 8m maximum clear span 2 1m maximum clear span 2 4m maximum clear span 2 7m. Four are epdm membranes and the fifth is a polyurathane liquid.

This is less than half the weight of glass which for the same thickness would weigh around 9 3kg. We sell a total of five roofings systems. 0 250 kn m ceiling live load 0 250 kn m tank load 0 450 kn max tile batten centres. 1 2mm standard 1 5mm commercial resitrix.

Whilst the weight of polycarbonate per square metre will depend on your chosen thickness it s significantly lighter than glass and most other roofing systems.