Understanding Thermally Modified Wood for Covered Walls
Thermally modified wood undergoes a high-temperature heat treatment process, typically without chemicals. This process changes the wood's cellular structure, resulting in material with improved dimensional stability and reduced moisture absorption compared to untreated wood. These characteristics are particularly beneficial for applications like covered patio walls where some exposure to environmental changes is still present, even if indirect.
The modification process also often results in a darker, more uniform color throughout the wood, which can deepen with age and exposure. For covered walls, this consistent color can contribute to a refined aesthetic. While thermally modified wood is more stable, it is not impervious to all conditions. Proper installation, including appropriate spacing and fastening, remains crucial for long-term performance.
Species and Profiles Suitable for Covered Patio Walls
Thermally modified wood is available in various species, each offering unique grain patterns and characteristics. Common options include thermally modified Pine and thermally modified Ash. Thermally modified Pine typically presents a lighter, more uniform appearance with subtle knots, while thermally modified Ash often features a more pronounced grain and richer tones.
For covered patio walls, a range of profiles can be considered. Shiplap profiles, such as the NORX Shiplap with a 1/8" reveal, create a clean, modern look with distinct shadow lines. Tongue and groove profiles offer a tighter fit, often used for a more seamless appearance. Square edge profiles can be installed with a gap for a contemporary open-joint aesthetic, provided the substructure behind is also considered for visual appeal and moisture management. The choice of profile influences both the visual texture and the installation method.
Lumber Plus offers [thermally modified wood](/thermally-modified-wood) in various species and profiles. For specific product details, including dimensions and available profiles, consult the individual product pages.
Planning for Exposure and Finish in Carson City, NV
Even covered patio walls in Carson City, NV, will experience temperature swings and some ambient humidity. While direct rainfall may be limited, condensation and indirect moisture can still occur. Thermally modified wood's enhanced stability helps it resist warping and cupping under these conditions.
Finishing options for thermally modified wood range from leaving it to weather naturally to applying stains or oils. If left unfinished, the wood will gradually silver over time, developing a soft gray patina. For those preferring to maintain the wood's original color or enhance its tone, a UV-protective oil or stain can be applied. For covered walls, the finish will generally last longer than on fully exposed surfaces, but periodic reapplication will still be necessary to preserve the desired appearance.
Consider the overall design of your patio. If the covered walls are adjacent to other wood elements like a [thermally modified wood deck](/thermally-modified-wood), coordinating the finish can create a cohesive look.
Substructure and Fastening Considerations
The substructure for covered patio walls needs to be robust and designed to support the cladding while allowing for proper air circulation. Typically, this involves attaching furring strips or battens to the structural wall. A rainscreen assembly, even in a covered application, can be beneficial for managing any moisture that might penetrate the cladding and promoting ventilation behind the wood.
Fastening thermally modified wood requires careful selection of appropriate fasteners. Stainless steel fasteners are generally recommended to prevent staining and ensure long-term corrosion resistance. The fastening method will depend on the chosen profile; some profiles are designed for face fastening, while others allow for concealed fastening, which can contribute to a cleaner visual aesthetic. Always follow manufacturer guidelines for fastener type, length, and spacing to ensure secure attachment and allow for the wood's natural movement.
Worked Example: Designing a Covered Patio Wall
Consider a covered patio in Carson City with a main wall section measuring 12 feet long and 8 feet high. The homeowner desires a modern look with subtle shadow lines.
1. **Material Selection:** Thermally modified Pine, NORX Shiplap profile (nominal 1x6, actual coverage 5.125 inches per board).
2. **Coverage Calculation:** The wall area is 12 feet * 8 feet = 96 square feet. Each board covers approximately 5.125 inches / 12 inches/foot = 0.427 feet in height. For an 8-foot height, you would need 8 feet / 0.427 feet/board = 18.7 boards. Rounding up, you would need 19 boards for the height. For a 12-foot length, if boards are typically supplied in 8-foot, 10-foot, 12-foot, or 16-foot lengths, using 12-foot boards would minimize waste. Therefore, 19 boards at 12 feet long would be a starting point. (19 boards * 12 linear feet = 228 linear feet).
3. **Waste Factor:** Always add a waste factor, typically 10-15%, for cuts, trimming, and potential imperfections. For this example, adding 15%: 228 linear feet * 1.15 = 262.2 linear feet. Thus, approximately 265 linear feet of 12-foot NORX Shiplap boards would be a reasonable purchase estimate.
4. **Substructure:** Install vertical furring strips, spaced according to manufacturer recommendations (e.g., 16 or 24 inches on center) to allow for horizontal cladding installation and air circulation.
5. **Finishing:** The homeowner opts for a clear UV-protective oil to highlight the natural tones of the thermally modified Pine while providing some protection. Periodic reapplication will be planned.
Before you order
- Verify species and profile are approved for vertical wall applications.
- Assess the degree of exposure (direct sun, wind, indirect moisture) for the covered patio walls.
- Choose a finish (or decide to let it weather) that aligns with desired aesthetic and maintenance commitment.
- Plan the substructure, considering ventilation and moisture management.
- Select appropriate fasteners (e.g., stainless steel) for the chosen wood species and profile.
- Calculate material quantities, including a waste factor, based on accurate measurements.
- Confirm any specific installation requirements from the manufacturer for your chosen product.
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 Carson City, NV. Ask our team to confirm availability, delivery to your ZIP code and which branch can support your order.
Questions to help you decide
Can thermally modified wood be painted for covered patio walls?
While thermally modified wood can be painted, it is often chosen for its natural appearance and enhanced stability. If painting is desired, ensure the surface is clean and primed with a product compatible with thermally modified wood. However, paints may obscure the wood's natural grain and require more frequent maintenance than an oil finish, especially if the covered area still experiences some weather exposure.
How does thermally modified wood compare to traditional treated lumber for patio walls?
Thermally modified wood is treated using heat, altering its cellular structure to improve dimensional stability and resistance to decay and insects without chemicals. Traditional treated lumber typically uses chemical preservatives to achieve similar resistance. Thermally modified wood often offers a more natural, consistent appearance and can be a preferred choice for those seeking a non-chemical treatment option for visible applications like patio walls. Always check local building codes for specific requirements.
What maintenance is required for thermally modified wood on covered patio walls?
Maintenance depends on whether the wood is finished or left to weather naturally. If left unfinished, the wood will gradually silver, requiring minimal maintenance beyond occasional cleaning to remove dirt or debris. If a finish like an oil or stain is applied, periodic reapplication will be necessary to maintain the color and protection. The frequency of reapplication will depend on the specific product used and the level of exposure, but generally, covered applications will require less frequent reapplication than fully exposed surfaces.
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