How do you read purlin sizes?
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How do you read purlin sizes?
Purlins come in different types and sizes….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.
- A ten-inch purlin can span 30 feet.
What lengths do purlins come in?
Purlin Sizes Purlins are typically anywhere from 4” up to 12” with a flange width of 1-½” up to 4”. They are available in a variety of custom sizes and lengths depending upon what a project requires.
What is the width of C purlins?
Our full range of thickness available for C purlins are: 1.2mm. 1.3mm. 1.4mm.
What is the thickness of purlin?
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).
What is the maximum spacing for 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.
What size should wood 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 long is the C purlins?
The standard length of C purlins is 6 meters.
How far apart should roof purlins be?
The purlin are ultimately used to fasten the roof steel providing a diaphragm effect, along with the siding, when properly engineered and installed. Spacing is typically 24″ on center in low snow loads and is reduced based upon truss span and snow load.
What type of wood is used for purlins?
As an example of a high quality application a purlin made out of poplar is chosen. In this case, more use is made of the resource potential of poplar, as it is applied as a structural component with a long life span. Higher quality applica- tion for raw materials like poplar wood can be part of a cascading strategy.
How thick should purlins be for metal roof?
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 do you lay out 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.
Can a 2×4 be used for purlins?
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.
