Posi Joist Flat Roof

It s span capability and wide timber flanges make it the more desirable alternative to all steel systems.

Posi joist flat roof.

Flat roof joist calculator. The full version allows any size. The strength of the posi joist floor provides greater room widths for increased living space within the attic delivering maximum value to the client. This demo version is fixed at 1m clear span.

The posi joist gives building designers the freedom to have a variety of internal room layouts without the constraints of solid and other engineered timber. Posi joist also known as metal web joists combine the light weight of timber with the strength of a steel web. 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. To build a roof joist for a flat roof you need some carpentry skills and a few basic tools.

Select floor or roof type. This extension to a veterinary practice in north cheam in surrey required a flat roof approximately 130 metres square. Their strength means they can span greater distances than other systems and often eliminate the need for beams and purlins. In roof applications posi joists are incredibly versatile and can be used for flat low and steep pitched roofs.

Posi attic trusses combines the solid feel of a posi joist with the benefits of a conventional attic truss. 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. Code of practice for permissible stress design materials and workmanship and bs 5268 7 2 1989 structural use of timber section 7 2. 1 enter joist details 1 1 span and joist spacing.

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. Posi joist can adequately span for floors and for flat and pitched roofs often allowing for increased joist centres when compared to alternative systems. A wide variety of end details allows for versatility and ease of installation on site. Flat apartment floor.

This is the distance between joist centres. Usually 400 450 or 600mm but any value can be used up to 610mm max.