Charlotte Roofing: Article About Types Of Sheathing
For homeowners hiring a Charlotte roofing professional to install a new roof, there are many questions that need to be asked. One important question concerns what type of sheathing materials will be used for the roof. There are different kinds of sheathing for different types of roofs, and they offer different levels of quality at installation.
The most common type of roof sheathing is plywood boards. Four by eight foot boards are relatively inexpensive and are well suited for use with nearly any asphalt shingles. However, due to the construction of plywood, it is susceptible to separation of its layers, which will cause critical weaknesses. Most often, this damage occurs as a result of moisture, which causes the layers of wood to expand at different rates, and pull apart from one another.
Oriented Strand Board, or OSB, is another type of sheathing that is commonly used on asphalt roofs. Oriented strand board is made up of small sections of wood laid across each other in a crosshatch type pattern and glued together. OSB offers a slightly higher quality than plywood and is less likely to have imperfections or knots that are commonly seen in plywood.
A roofing professional from Southern Home Services of Charlotte NC would be happy to answer questions about roof repairs or fiber cement siding.
Most sheathing is laid down in an offset pattern so that seams do not create a point of weakness where they come together. The sheathing is nailed down to the rafters, and metal brackets are usually installed along the bottom edges to help support the weight of each board.
However, there are now also several sheathing options on the market that include a tongue and groove system so that the sheathing boards can fit more precisely together. This system creates a more uniform decking for the other layers of roofing to secure to without any visible or uneven seams between boards.
For metal roofs, sheathing is not necessary, but an additional layer of purlins will be installed to support the large metal sheets. Purlins are small support beams that run perpendicular to the rafters and are typically either 1 or 2 inches wide.
Knowing what type of sheathing materials are available is important for making final purchasing decisions for a new roof installation. Understanding the strengths and weaknesses of plywood and oriented strand board can help homeowners decide whether they want to spend the extra money to upgrade to the more consistent quality level offered by OSB overall. In addition, the use of tongue and groove type sheathing can offer time savings and help to simplify a roof installation by eliminating the need for metal brackets and making it easier to lay down sheathing evenly without gaps.