Thermally Modified Wood for Covered Patio Walls in Jackson, MS

Understanding Thermally Modified Wood for Wall Applications

Thermally modified wood undergoes a process of heat and steam treatment that alters its cellular structure. This modification enhances its stability and resistance to moisture absorption, making it suitable for exterior applications, including covered patio walls.

Unlike untreated wood, thermally modified wood exhibits reduced swelling and shrinking, which is crucial for maintaining the integrity and appearance of wall cladding over time. This characteristic is particularly beneficial in areas with fluctuating humidity.

Selecting the Right Profile for Covered Patio Walls

The profile of the thermally modified wood plays a significant role in the final appearance and performance of your covered patio walls. Common profiles include tongue-and-groove, shiplap, and square edge, each offering distinct visual effects and installation considerations.

Tongue-and-groove profiles create a tight, interlocking fit, which can be advantageous for a clean, continuous look and can help shed water. Shiplap offers a more pronounced shadow line and can simplify installation. Square edge profiles, when installed with a gap, create a board-and-batten or open-joint aesthetic. Consider how the profile will interact with the overall design of your patio and the level of protection from the elements the covered space provides.

For a classic, seamless look on a covered wall, a tongue-and-groove profile such as the NORX T&G profile is a popular choice. If a more defined shadow line is desired, a shiplap profile can offer that visual interest. Maximo Accoya, available in various profiles, also offers enhanced stability for such applications.

Finishing Options for Thermally Modified Wood Walls

Thermally modified wood can be left unfinished to weather naturally to a silver-gray patina, or it can be finished with stains or sealants. The choice of finish impacts both the aesthetic and the maintenance requirements.

If you prefer to maintain the original color of the wood, or to introduce a specific hue, applying a UV-protective finish is recommended. This can help to slow the natural weathering process and provide an additional layer of protection. Always follow the manufacturer's recommendations for compatible finishes and application methods. Regular cleaning and reapplication of finishes will be necessary to preserve the desired appearance.

Attachment Methods and Substructure Considerations

Proper attachment is critical for the longevity and stability of your thermally modified wood patio walls. The substructure must be sound and provide adequate ventilation behind the cladding, even in a covered application.

For most wall applications, a rainscreen system with furring strips is recommended. This creates an air gap behind the cladding, allowing for drainage and ventilation, which helps prevent moisture accumulation. Fasteners should be corrosion-resistant stainless steel and selected based on the thickness and profile of the wood, as well as the substructure material. Hidden fastening systems can provide a cleaner aesthetic, while face fastening offers a more traditional look.

Ensure that the substructure is plumb and level to facilitate straightforward installation and a professional finish. Consult product documentation for specific fastening guidelines and spacing requirements for the chosen thermally modified wood profile.

Worked Example: Designing a 10-foot by 8-foot Covered Patio Wall

We select a 1x6 (nominal size) thermally modified wood shiplap profile, which typically has an actual coverage of approximately 5.125 inches per board.

First, calculate the total wall area: 10 feet x 8 feet = 80 square feet. Next, determine the number of boards needed for the height. An 8-foot (96-inch) height divided by the 5.125-inch coverage per board means approximately 18.73 boards. Rounding up, we need 19 boards for the height. Since the wall is 10 feet (120 inches) wide, and boards are typically sold in standard lengths (e.g., 8-foot, 10-foot, 12-foot, 16-foot), we would likely purchase 10-foot or 12-foot lengths to minimize waste for the width.

To cover the 10-foot width using 10-foot boards, we would need 19 boards. The total linear footage required would be 19 boards x 10 feet/board = 190 linear feet. If 12-foot boards were purchased, and assuming minimal end waste, 19 boards x 12 feet/board = 228 linear feet. Always account for a waste factor (typically 10-15%) for cuts, mistakes, and potential imperfections. For this example, adding a 10% waste factor to 190 linear feet brings the purchase quantity to 209 linear feet.

For the substructure, vertical furring strips (e.g., 1x3 pressure-treated lumber) would be installed horizontally across the wall studs, spaced according to cladding manufacturer recommendations, typically 16 or 24 inches on center. This creates the necessary air gap and provides a secure fastening surface for the shiplap boards.

Before you order

• Determine the desired aesthetic: rustic, modern, seamless, or with defined shadow lines.
• Select a thermally modified wood profile (e.g., tongue-and-groove, shiplap, square edge) suitable for covered wall applications.
• Decide on a finish: natural weathering or a UV-protective stain/sealant.
• Plan for proper substructure and ventilation behind the cladding, even in covered areas.
• Choose corrosion-resistant fasteners compatible with the wood and substructure.
• Calculate material quantities, including a waste factor, for both cladding and substructure.
• Confirm local building practices and any specific requirements for exterior wall cladding.

Confirm installation details, approved uses and warranty terms in the current instructions for the exact product and profile. Your installer should verify the substrate, structure and applicable project requirements.

This is a planning guide for projects in Jackson, MS. Ask our team to confirm availability, delivery to your ZIP code and which branch can support your order.

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