What size purlins do I need?

The sizes are as follows: A four-inch purlin can span 12 feet. A six-inch purlin can span 18 feet. An eight-inch purlin can span 25 feet.

How is purlins spacing calculated?

When positioned, roof purlins should be spaced no further than 1.2 metres apart when using sheeting with a thickness of 0.7mm, and 1 metre when using 0.5mm sheeting. Exact requirements will vary, but as a rough guide, this is a good rule of thumb to follow.

How do you layout purlins?

Lay the first purlin at the ridge of the roof down to the chalk line beginning at either corner. Fasten the purlin with 16d common nails into each vertical rafter. Insert two equally spaced nails into the rafter. The rafters are generally spaced every 16 inches on center.

What sizes do C purlins come in?

Purlin and girts are available in 100, 150, 200, 250, 300, 350 and 400 sections. The range is suitable for use across commercial, industrial, rural and domestic applications.

How do you attach purlins to rafters?

How long can a purlin span?

The maximum length of the Fascia Purlin is 15000mm. Length tolerance for all sections is ±5mm.

How far can 2×6 purlins span?

A 2×6 spaced 16 inches apart can span a maximum distance of 13 feet 5 inches when used as a rafter, 10 feet 9 inches when used as a joist, and 6 feet 11 inches when used as a deck beam to support joists with a 6-foot span.

Should purlins be flat or on edge?

Putting the 2x4s on edge will give more strength between the trusses. Putting them flat will give more strength in terms of the purlins tipping over on the trusses.

Where can I find technical details for the construction of purlins?

Technical details for the construction of purlins, side rails, eaves beam s and mezzanine floor joists can be found on the following pages together with the various components and accessories that we manufacture. Properties for Z, C and mezzanine sections can also be found under components and accessories together with all of our component weights.

What can be found under a load table?

Load tables of the various systems for purlins, side rails and eaves beams can also be found under load tables. Dimensions, properties and weights for our range of Z, C and mezzanine floor sections.

When selecting purlins real applied loads must be considered?

When selecting purlins real applied loads must be considered along with the stated capacities in this manual. All spans are considered loaded concurrently and no allowance has been made for uneven or skip loading.

How do you calculate the length of a purlin?

SPAN – MM SPAN – MM OVERALL PURLIN LENGTH = SPAN + 70MM + (LAP/2) LAP 3 SPAN LAPPED SPAN – MM SPAN – MM SPAN – MM LAP END SPAN END SPAN OVERALL PURLIN LENGTH = SPAN + 70MM + (LAP/2) OVERALL PURLIN LENGTH = SPAN + 70MM + LAP