# What size should purlins be?

## What size should purlins be?

The maximum span of 2-inch by 4-inch (51 mm by 102 mm) purlins shall be 4 feet (1219 mm). The maximum span of the 2-inch by 6-inch (51 mm by 152 mm) purlin shall be 6 feet (1829 mm), but the purlin shall not be smaller than the supported rafter.

## How do you choose purlin spacing?

The spacing of purlins depends largely on the maximum safe span of the roof covering and glazing sheets. Hence, they should be less than or equal to their safe spans when they are directly placed on purlins.

How far can 2×4 purlins span?

2×4 purlins may also be nailed on top of the rafters with one 60-d nail or attached with metal clips at each rafter. Rafters may be spaced up to twelve feet, dependent on purlin size, when purlins are turned edgewise.

### How thick should purlins be?

The substructure to which the metal panels are fastened must be properly spaced and sufficiently thick to provide a roof or wall system able to meet required design loads. A 2″ nominal lumber thickness or 1″ nominal thickness are both acceptable purlins.

### How far can a 2×6 purlin 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.

How Far Can AC purlin span?

A four-inch purlin can span 12 feet. A six-inch purlin can span 18 feet. An eight-inch purlin can span 25 feet. A ten-inch purlin can span 30 feet.

#### How far apart can you space purlins?

The maximum distance between purlins is five (5) feet on center. If your building site is in a region that is prone to heavy snow loads or high winds, then we may place your purlins closer together for added strength.

#### How far can 6 inch purlin span?

As far as the cee purlin goes. 6″ will span up to 18′ bay spacing, 8″ up to 25′, 10″ from 25′-30′.

HOW FAR CAN 8 inch c purlin span?

8″ C will span 25′, 6′ will span 20′.

## Can I use 1×4 for purlins?

Kiln-dried softwood is recommended for purlins or decking (pine, fir, hemlock, and spruce). On re-roofing projects where the condition of the old decking is in question, or where existing shingles will be left in place, new 2×4 or 1×4 purlins should be fastened through the decking and into the rafters.

## How far can you span 6 inch purlin?

How far can 6 in C purlin span?

18 feet
A six-inch purlin can span 18 feet. An eight-inch purlin can span 25 feet. A ten-inch purlin can span 30 feet.

### What are the different sizes of steeline purlins?

Steeline standard purlins are available in Z or C cross sections, with heights of 100, 150, 200, 250, 300, 350 and 400mm and thicknesses of 1.0, 1.2, 1.5, 1.9, 2.4 and 3.0mm (BMT). This design manual has been prepared to assist Steeline customers to develop economic design solutions for their projects.

### What size hole do you punch for Z purlin?

HOLE PUNCHING Metroll C and Z purlin sections are normally supplied with holes punched to the AISC guide except in VIC where 150mm sections are punched to Structural Steel Fabricator Association Victoria recommendations (70mm centres).

How do I order 6 hole purlins and accessories?

TABLE 6 Hole Sizes in Purlins ORDERING To place orders for purlins and accessories contact your nearest Steeline store. To find a Steeline store closest to you, visit www.steeline.com.au. For your convenience order forms are included on pages 1-10 and 1-11 of this manual. TABLE 7 2 and 4 Hole Cleats – Nominal Dimensions 75 A C B 130 25 80 D

#### What size bolts do I need for my purlin?

The bolts specifications depend on the purlin size. The 150, 200 and 250mm purlins generally use standard M12, Grade 4.6 purlin bolts. The 300, 350 and 400mm purlins generally use standard M16, Grade 4.6 bolts. In some cases where the bolts are heavily loaded, high strength Grade 8.8 purlin bolts are to be used.