There are numerous components to a roofing system. Though most homeowners are familiar with the shingles and gutters, they may not be as informed on other aspects of a roof including the flashing, underlayment, or sheathing (AKA decking).
In this article, we will focus on roof sheathing/roof decking. Roof sheathing is a durable layer of wood boards that are fixed to the joists and trusses of the roof. Roofing shingles are attached to these wood boards.
What does roof sheathing do?
The main purpose of roof sheathing is to add a support system and additional strength for your roof. Sheathing supports the shingles, offers protection against weather elements, and evenly distributes the weight of the roof.
What is roof sheathing made of?
Roof sheathing is typically constructed of plywood or oriented strand board (OSB). Even though both materials are wood, they each have their own pros and cons. Plywood is sturdier, but this durability comes with at a higher price point. It also is heavier in weight. OSB is usually preferred by roofers due to its lower weight and cost. But OSB might not be the best option if you are using heavier roofing options like concrete or slate roofing tiles.
Some less commonly used roof sheathing materials include wood boards and concrete sheathing. Roof sheathing is normally 5/8” inch thick.
What are the benefits of roof sheathing?
There are several key benefits provided by roof sheathing. These benefits include the following:
It helps support and strengthen your roof
The weight of shingles can be a considerable amount for a roofing structure. Roof sheathing gives the support needed to be sure there isn’t any bowing and sagging of the roof. This helps ensure that the weight across the roof is evenly distributed. In areas where there may be heavy amounts of snow or precipitation this is especially important.
It helps protect against leaks
Roof sheathing gives you another layer of protection against torrential weather, especially if the decking is weatherproof. Weatherproof decking increases longevity of your roof and protects against water damage.
It helps protect against fires
Roof sheathing or decking can also protect your home from fire since most are fire-resistant. This helps prevent fire ignition which can help stop fires from spreading to other parts of the home.
How can you tell when you need new roof sheathing?
Because roof sheathing is such a key element of your roofing system you will want to verify it is not worn out or damaged. Roof sheathing is usually replaced during the re-roofing process but there are other indications that may alert you that your sheathing may need to be replaced. Here are four signs to watch out for:
- The sheathing is broken – if you can see broken sheathing boards or if the roof is beginning to sag this is a obvious indication the sheathing needs to be replaced. This could be the symptom of too much weight being placed on one part of the roof. Also, this can happen from something falling and landing on the roof (like a tree branch).
- A sagging ceiling or roofline – if you notice sagging along your roofline or if you see sagging from your ceilings you should quickly call a professional. Both of these are symptoms that you may need a new roof sheathing.
- Water damage or rot – if you see water stains or leaks on your ceiling, you will need to further investigate to find the source of the problem. Water damage to sheathing can be very problematic because it can impact the structure and integrity of your roof. Water damage can lead to numerous problems like rotting with the sheathing. If you encounter darkened spots on the wood, it likely means rot is setting in. If you suspect a leak here is some information on how to find the leak in your home.
- Holes of light in the roof – if you see light shining through holes in your roof, you will want to call a roofing professional immediately. Any holes in a roofing system can allow water straight through the roof and cause multiple long-term problems.
The professionals at Modern Blu Austin are here to help with any roof or sheathing problems you may have. If you live in the Leander, Cedar Park, or Lago Vista areas and suspect you may have a leak call our professionals at Modern Blu Austin at 469-546-7636, or contact us online to schedule an appointment. We would be happy to provide a free roof inspection!