Purlin spacing for corrugated roofing is something that should be given consideration when designing a roof.
The purlin spaces in between the panels in your corrugated metal or fiberglass roof can greatly affect how well it performs, and whether it needs to be replaced earlier than expected. We will explore this issue further below.
What is Purlin Spacing?
Purlins are long, narrow beams that span the length of the roof; they act as support structures for the insulation (caused by air gaps), provide nailing points to attach rafters and sheathing boards, and help distribute weight evenly throughout the structure. The more space there is between them, or “rafter-to-purlin spacing,” the less
Roofing is all we do.
The best way to ensure your Purlins are set properly is to use Purlin spacers. Spacers will ensure the beams are properly positioned and do not shift over time.
Why Purlin Spacing is Important
Purlin spacing is important because it determines whether or not you are using the right purlin board. The reason for this is that different types of roofing material requires different sized spacers in order to properly support it.
The other reason proper purlin spacing is important is because it ensures proper ventilation. If you don’t leave the right space between purlins, they will impede airflow and make your roof lose heat too fast. This not only causes damage to your roof in the form of UV degradation but it wastes energy on cooling costs as well.
What Size are Purlin Spacers?
Purlin spacers come in a variety of sizes, and it is important to know what size you need for your specific roofing material.
There are some general guidelines that can help you determine the best fit, though. Fiberglass purlins typically use an 18″ on-center spacing while metal purlins normally have 24″ on-center spacing. If you’re using wood boards as sheathing, then there should be at least 2′ between them; if they are plywood boards instead of regular wood board then there should be at least 3′.
If you’re not sure which type of purlin spacer will work with your roofing material, consult with someone who has experience building roofs or talk to a local contractor about what in the right option for your roof.
What Determines Purlin Spacing?
In order to determine the right purlin spacing for your project, you should first know what type of purlins will be used on your roofing material. Fiberglass purlins typically use an 18″ on-center spacing while metal purlins normally have 24″ on-center spacing. In addition, there are different types of lumber that can be used as sheathing boards; if they are plywood boards instead of regular wood board then there should be at least 3′.
Purlin spacing depends on these factors:
- which type of purlins are being used in construction
- the purlin manufacturer and how the purlins are being manufactured
- the size of the lumber
What Makes a Good Purlin?
A “good” purlin is one that has been made to fit your given roofing needs. A good purlin will fit together properly, resulting in even spacing throughout your structure.
A good purlin also has correct heights that are not too tall or too short. If the purlins are too tall, they will be stiff and inflexible; if they are too short, however, there won’t be enough room for your insulation or any type of sheathing boards.
If you have any worries about whether or not your purlin is performing well we recommend that you consult a construction professional. They will know all about purlins and can tell you which one is best for your roof.
Purlin Spacing on Corrugated Metal and Fiberglass Roofs
Purlin spacing is an important factor to consider when designing a corrugated metal or fiberglass roof. The purlin spaces in between the panels in your corrugated metal or fiberglass roof can greatly affect how well it performs, and whether it needs to be replaced earlier than expected.
Purlin spacing determines the size of your roofing material, as well as how much ventilation you have in your building. If you’re not sure which type of purlins to use for a corrugated metal or fiberglass roof, consult with someone who has experience designing roofs. A good purlin will be made specifically for what you need; if they are too tall or too short then this could cause issues later on down the line.
When choosing between different sized lumber boards, always go with plywood ones over standard wood boards because they allow more air flow and help keep heat from escaping so quickly. The last thing we want is our customers’ houses getting damaged due to poor construction!
How far apart should roof purlins be?
Roof purlins are usually spaced 24″ apart.
What is the spacing for purlins on a metal roof?
Purlins are spaced 24″ apart on horizontal roofs.
What size purlins do you use for metal roof?
1” x 4” x 12′ lumber is the best sized purlins for metal roofing.