Posi Joist Flat Roof

Code of practice for permissible stress design materials and workmanship and bs 5268 7 2 1989 structural use of timber section 7 2.

Posi joist flat roof.

Flat roof joist calculator. To build a roof joist for a flat roof you need some carpentry skills and a few basic tools. Posi attic trusses combines the solid feel of a posi joist with the benefits of a conventional attic truss. The strength of the posi joist floor provides greater room widths for increased living space within the attic delivering maximum value to the client.

How to install joists for a flat roof the roofing surface is installed over the joists while insulation is placed between them and the ceiling beneath is suspended from them. Flat apartment floor. Usually 400 450 or 600mm but any value can be used up to 610mm max. A wide variety of end details allows for versatility and ease of installation on site.

The following easi joist. Select floor or roof type. This demo version is fixed at 1m clear span. Posi joist can adequately span for floors and for flat and pitched roofs often allowing for increased joist centres when compared to alternative systems.

This extension to a veterinary practice in north cheam in surrey required a flat roof approximately 130 metres square. 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 47 x 195 4 41 4 31 3 92 47 x 220 5 04 4 85 4 41 75 x 170 4 50 4 38 3 99. Posi joist also known as metal web joists combine the light weight of timber with the strength of a steel web. The full version allows any size.

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. This is the distance between joist centres. It s span capability and wide timber flanges make it the more desirable alternative to all steel systems. In roof applications posi joists are incredibly versatile and can be used for flat low and steep pitched roofs.

Top hung joists can be supported from trimmers with no need for a hanger. 1 enter joist details 1 1 span and joist spacing.