Scandinavian Thermally Modified Wood for Covered Outdoor Walls

Understanding Covered Outdoor Walls vs. Fully Exposed Facades

A covered outdoor wall, such as those found on a porch, loggia, or under a deep overhang, benefits from significant protection compared to a fully exposed facade. This protection reduces direct impact from rain, snow, and UV radiation, which are primary factors in material degradation and color change for exterior wood.

While sheltered, these walls are still part of the exterior envelope. They are subject to ambient humidity, temperature swings, and indirect moisture. This means materials chosen must still possess a degree of weather resistance and dimensional stability, but often do not require the same level of extreme durability as a fully unsheltered surface. Scandinavian Thermally Modified Wood, with its improved stability from the thermal modification process, is well-suited for these conditions without relying on chemical preservatives.

The reduced exposure also often allows for a wider range of finish options and can extend the period before maintenance is needed, compared to a fully exposed application.

Why Choose Scandinavian Thermally Modified Wood for Sheltered Exteriors?

Scandinavian Thermally Modified Wood is a Nordic softwood selection that undergoes a controlled heat and steam process. This modification improves the wood's dimensional stability, meaning it is less prone to swelling and shrinking in response to humidity changes. This characteristic is particularly beneficial for covered outdoor walls, where moderate humidity fluctuations are common.

The thermal modification process also imparts a warm, consistent color throughout the wood and enhances its natural grain, offering an aesthetic that is both modern and inviting. As it is a chemical-free process, it aligns with projects prioritizing natural materials and sustainable practices.

The material's enhanced stability helps maintain a consistent appearance over time in a sheltered environment, reducing the likelihood of warping or cupping that can affect untreated wood in outdoor settings. Its versatility in profiles also allows for coordination with other exterior or interior elements.

Available Profiles and Their Application for Covered Walls

Scandinavian Thermally Modified Wood is available in several profiles, each offering a distinct aesthetic and installation method suitable for covered outdoor walls. The choice of profile can significantly influence the final look and shadow lines of your project.

For covered walls, it creates a clean, linear appearance with subtle shadow lines, suitable for both vertical and horizontal installations. Its consistent spacing helps achieve a refined finish.

The "Fluted #5" profile (nominal size 1 × 6) offers a more architectural, textured surface. The fluting creates distinct ridges and valleys, adding depth and visual interest. This profile can be particularly impactful on a covered wall where light can play across its surface, highlighting the texture. It is often specified for architectural walls and ceilings.

For a more robust or versatile option, the "S4S E4E" (Surfaced Four Sides, Eased Four Edges) profile (nominal size 5/4 × 6) can be considered. While also suitable for decking, its smooth finish and eased edges make it adaptable for a clean, contemporary covered wall application, especially where a thicker board appearance is desired. This profile supports various fastening methods, depending on the desired aesthetic.

Planning a Covered Outdoor Wall: A Hypothetical Example

Consider a hypothetical covered patio wall measuring 12 feet long by 8 feet high.

First, calculate the total wall area: 12 feet * 8 feet = 96 square feet. Next, determine the number of boards needed. Each 1 × 6 board covers approximately 5.5 inches (0.458 feet) in width. For a 12-foot long wall, you would need 12 feet / 0.458 feet/board = approximately 26.2 boards. Since boards are typically sold in standard lengths (e.g., 8-foot, 10-foot, 12-foot, 14-foot, 16-foot), and considering the 8-foot height, 8-foot length boards would be a practical choice to minimize cuts and waste for vertical installation.

If using 8-foot boards for the 8-foot high wall, you would need 27 boards (rounding up from 26.2). To account for cuts, waste, and potential future repairs, it's advisable to add a waste factor, typically 10-15%. For this project, 27 boards * 1.15 (15% waste) = 31.05 boards. This example assumes no complex angles or openings, which would require further detailed measurement and cut planning.

Always confirm the actual installed width of the profile with your supplier, as nominal sizes can differ from finished dimensions. Also, consider the substructure (furring strips or blocking) required to support the vertical installation, ensuring proper ventilation behind the cladding.

Maintenance Considerations for Sheltered Applications

While Scandinavian Thermally Modified Wood is dimensionally stable, all wood materials will exhibit some changes in appearance over time, especially when exposed to UV radiation, even indirectly. In a covered outdoor setting, the rate of graying will be significantly slower and more even than on a fully exposed facade.

To maintain the original warm color, a UV-inhibiting finish can be applied. If a natural graying aesthetic is desired, no finish is strictly required, though a clear water repellent may help protect the surface. Regular cleaning to remove dust, pollen, and mildew with a soft brush and mild soap solution is generally sufficient to keep the surface looking its best.

Inspect the covered wall periodically for any signs of moisture accumulation or damage, especially in corners or where the wall meets other materials. Addressing any issues promptly can help preserve the material's longevity and appearance.

Before you order

• Is the wall truly covered and protected from direct rain and snow?
• What aesthetic (smooth, fluted, linear) is desired for the covered space?
• Will the wall be installed vertically or horizontally?
• What is the total square footage of the covered wall area?
• What are the available lengths for the chosen profile, and how will they minimize waste?
• What type of substructure is required for the chosen profile and installation direction?
• Is a pre-finish desired, or will the material be allowed to naturally weather?
• What is the budget for materials and installation?
• How will the covered wall integrate with adjacent materials and architectural elements?
• Are there any specific ventilation requirements for the wall assembly in this climate?

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.

Questions to help you decide

Keep planning your project