Structural Sheathing (plywood/OSB) in Exterior Walls. Install structural sheathing (plywood/OSB) in exterior walls to ensure the building will resist design wind pressures.
Exterior sheathing is a board or panel made from various materials, installed over the exterior walls of a building. Its primary functions include lending structural stability and insulating the home. Let's dive into the layers that make up your home's exterior.
If you want to finish off OSB and make it look really good, use a belt sander and sand down any rough areas, especially at the seems. Then use drywall compound and run a thin coat on the OSB. Then, when it dries, apply another coat that is a little thicker.
There is a difference between “exterior use” and products designed for “use as exterior sheathing.” OSB is not suitable for unprotected exterior (outdoor) use, but it is well suited for use as exterior sheathing on walls and roofs. In both cases, the OSB will be protected from permanent exposure.
Whatever way you take it, OSB is usually waterproofed during the manufacturing process. However, if you intend to use it for an exterior application, you may need to make it more resistant to water by adding a protective layer.
Five common structural exterior sheathing options include wood-based, gypsum, glass mat, cement board, and Barricade® Thermo-Brace®. Plywood sheathing is made from whole sheets of wood that are cross-laminated, which give the boards strength and stiffness. This helps with expansion and contraction.
Underlayment or weather-resistive barrier (WRB) is installed between the siding and the sheathing. This can be tar paper or a house wrap, such as HardieWrap® or Tyvek HomeWrap®.
Nails: Speed and Cost-Effectiveness
Nails have long been a go-to fastener when speed and cost-effectiveness are primary considerations. They are particularly efficient when large quantities of fasteners are required, making them a great choice for framing and sheathing projects.
Conclusions 1. The service life of OSB is indefinite (expect 50 years or longer) if it is used and protected properly. 2. OSB should not be used where it is permanently exposed to the outdoor environment unless panels are qualified as Exterior (e.g. siding) and recommended coating is periodically renewed.
A fully sheathed wall of plywood or OSB, properly connected to the foundation below and roof above, is a strong barrier that resists the persistent forces of hurricanes, tornadoes, and high wind events.
Choose a sealant compatible with OSB and suitable for your project's needs. Apply the sealant using a caulking gun, focusing on the edges and any joints between panels. Use a putty knife or your finger (wearing a glove) to smooth the sealant and ensure complete coverage.
9 and this section on all sheathable exterior wall surfaces, including areas above and below openings. Structural sheathing panels shall consist of minimum 7/16-inch-thick (11 mm) oriented strand board or 15/32-inch-thick (12 mm) plywood.
Usually made from plywood or metal, furring strips are long, narrow pieces of material that are installed intermittently as part of the exterior to create essential space and airflow within the wall.
Sheathing, also known as decking, refers to the layer of boards or panels that are attached to the exterior walls, floors, or roof of a house. It serves as a base for other materials, such as siding or roofing, and provides structural support.
Oriented strand board (OSB) and plywood are both commonly used for exterior wall sheathing. OSB is often less expensive and offers good structural performance. However, plywood is generally stronger, more moisture-resistant, and less prone to warping.
Backerboard. Backerboard, also known as sheathing, is a structural layer beneath the siding panels. Sheathing is typically made of plywood, oriented strand board (OSB), or foam boards and is installed over the exterior framing of the house.
Plywood or oriented strand board (OSB) sheathing will be applied to the exterior walls and the roof to seal off the inside. After sheathing, house wrap (a protective barrier that prevents water from entering the structure and causing mold or wood rot) is also applied.
There are many types of exterior plywood to choose from — the most common being CDX or ACX. Exterior plywood is marked with an X to denote this use and the construction grade is in the first two letters; the first letter refers to the front of the plywood and the second refers to the back.
Both HPL and ACP sheets are highly weather-resistant owing to their multi-layered composition, making them extensively used as exterior wall cladding. The thermosetting resins equip HPL sheets with several special attributes, including weather resistance.
Sheathing is the plywood or OSB layer attached to the studs or trusses on the exterior of a building. It provides structural stability, forms a base for exterior finishes, and helps prevent moisture penetration.
Plywood and OSB are largely considered the best wall sheathing choices because of their overall abilities to hold fasteners well, create a strong bond between studs, and provide some thermal advantages. The “big two” aren't the only selections available however. Structural fiberboard is one such option.
Using OSB Safely
When installing in vertical applications such as wall sheathing, you'll want to orient the smooth or stamped side facing out. The smooth side has a better moisture resistance and will ultimately provide better performance against weather.
Panelvent DWD is a 12mm thick square-edged sheathing board designed to replace OSB and plywood as an external lining board to provide racking and enhanced vapour transfer for timber frames and conventional construction. It offers advanced moisture control and durable building protection.