Understanding Your Existing Wall Assembly
Before selecting new siding or cladding, it is essential to understand the existing wall assembly. This involves identifying the layers of your current exterior wall, from the interior finish to the outermost siding. Key components to assess include the framing, sheathing, vapor barrier, weather-resistive barrier (WRB), insulation, and the current cladding material. Knowing these details helps determine if the existing structure can support new materials and if any upgrades are necessary for performance.
For example, older homes in Missoula may have different wall constructions than newer builds. A renovation might be an opportunity to improve insulation or update the weather-resistive barrier, especially if there are signs of moisture intrusion or air leaks. This initial investigation can prevent future issues and ensure the longevity of your facade renovation.
Evaluating Substrate and Structural Readiness
The substrate is the surface to which your new siding or cladding will be attached. It must be sound, level, and capable of holding the new material securely. Common substrates include plywood, OSB, or existing sheathing. Any rot, damage, or significant unevenness in the substrate must be addressed before installation. This might involve repairing or replacing sections of the sheathing.
Beyond the substrate, consider the overall structural readiness of your wall. Heavier cladding materials, such as some hardwoods, may require additional structural support, especially if the existing framing was not designed to bear that weight. Consult with a professional to ensure your wall can adequately support your chosen material. This is particularly important for multi-story facades or areas exposed to high winds.
Considering Rainscreen Principles for Durability
A rainscreen assembly is a sophisticated wall system designed to protect a building's structure from moisture. It incorporates an air gap between the exterior cladding and the weather-resistive barrier. This gap allows for drainage of any water that penetrates the cladding and promotes ventilation, helping to dry out the wall assembly. For Missoula's climate, where temperature fluctuations and moisture can occur, a rainscreen can be a valuable consideration for long-term facade durability.
When renovating, assess if your existing wall has a rainscreen gap. This typically involves installing furring strips over the WRB to create the necessary air space before attaching the cladding. While it adds a step to the installation, the benefits in moisture management and ventilation can be substantial.
Lumber Plus offers a range of siding and cladding materials suitable for rainscreen applications, including Thermally Modified Wood and Maximo Accoya. These materials, when installed with a proper rainscreen, can contribute to a resilient and well-performing facade. For example, Thermally Modified Ayous cladding can be used in a rainscreen system, providing a durable exterior. (S1)
Material Selection: Thermally Modified Wood, Hardwood, and Composite Options
Lumber Plus offers a diverse selection of siding and cladding materials, each with distinct characteristics suitable for facade renovations.
Thermally Modified Wood, such as Scandinavian Thermally Modified Wood and Thermally Modified Ash, undergoes a heat treatment process that enhances its stability and durability. This makes it a suitable choice for exterior applications where resistance to moisture and movement is important. Its clean grain can contribute to contemporary facades. (S1)
Hardwood options include Ipe, Cumaru, Garapa, Angelim, Jatoba, and Tigerwood. These Brazilian hardwoods offer natural beauty and varying levels of density and color. They can create bold, impactful facades but may require more robust structural considerations due to their weight. (S1)
Norx Composite Cladding provides an alternative that often requires less maintenance than natural wood. Available in various finishes, composite materials offer consistency and can be a practical choice for those seeking a durable and low-upkeep facade. (S1)
Maximo Accoya, an acetylated wood, offers enhanced durability and stability, making it another strong contender for siding and cladding applications. It is distinct from thermally modified wood but shares similar performance benefits, making it an excellent choice for a long-lasting facade. (S1)
Worked Example: Renovating a 20-Foot by 10-Foot Wall Section
Let's consider renovating a specific section of a facade on a Missoula home: a 20-foot wide by 10-foot high wall section. The existing wall is traditional wood siding over plywood sheathing, with a basic felt paper WRB. The goal is to install new Thermally Modified Ayous cladding in a horizontal profile, incorporating a rainscreen gap.
First, we'd remove the existing siding and inspect the plywood sheathing. Assume minimal damage, requiring only minor repairs. The felt paper WRB will be replaced with a modern house wrap. To create the rainscreen, 3/4-inch thick furring strips will be installed vertically over the WRB, spaced 16 inches on center. This creates the necessary air gap and provides a nailing surface for the new cladding.
For a 20-foot by 10-foot area, which is 200 square feet, and assuming Thermally Modified Ayous boards are available in 5-inch face width (nominal) and various lengths, we calculate the linear footage needed. A 5-inch face width means each board covers approximately 0.417 feet of vertical height. Therefore, for 200 square feet, approximately 480 linear feet of cladding would be needed (200 sq ft / 0.417 ft). This calculation does not account for waste or specific board lengths. A more accurate take-off would involve a detailed cut plan considering available board lengths and minimizing waste. For a facade like this, an additional 10-15% for waste and cuts is generally recommended, bringing the estimated requirement to around 528-552 linear feet.
This example highlights the importance of precise measurements, understanding material dimensions, and accounting for installation details like the rainscreen gap and waste factors during the planning phase of your renovation.
Project Planning: What to Discuss with Your Contractor
When working with a contractor on your Missoula facade renovation, clear communication is crucial. Discuss the findings from your existing wall assessment, including any identified issues with the substrate, WRB, or insulation. Share your material preferences, whether it's Thermally Modified Wood, a specific hardwood, or Norx composite.
Ensure your contractor understands the importance of proper installation techniques, especially if you are incorporating a rainscreen assembly. Review the manufacturer's installation guidelines for your chosen siding or cladding material together. Discuss details such as fastening methods, trim details around windows and doors, and how corners will be finished.
Obtain a detailed quote that outlines all materials, labor, and any necessary preparatory work. A well-planned project, with a clear scope of work and material specifications, helps ensure a successful facade renovation.
Before you order
- Have you thoroughly inspected your existing wall assembly for damage, rot, or moisture intrusion?
- Is your current substrate sound and level, or does it require repairs or replacement?
- Have you considered incorporating a rainscreen assembly for improved moisture management and durability?
- Have you evaluated the structural capacity of your wall to support your chosen siding/cladding material?
- Do you have a clear understanding of the installation requirements for your selected material?
- Have you discussed your material choice, installation plan, and budget with your contractor?
- Have you accounted for waste factor in your material quantity estimates?
- Are you aware of the long-term maintenance requirements for your chosen siding/cladding material?
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 Missoula, MT. Ask our team to confirm availability, delivery to your ZIP code and which branch can support your order.
Questions to help you decide
What is the difference between siding and cladding?
While often used interchangeably, 'siding' typically refers to the exterior material on residential structures, often installed horizontally with overlapping joints. 'Cladding' is a broader term encompassing any non-structural exterior material applied to a building, including various profiles and materials used in both residential and commercial projects, often with a more modern or architectural aesthetic.
How do I know if my existing wall needs a new weather-resistive barrier (WRB)?
If your existing WRB shows signs of tears, holes, water stains, or deterioration, it likely needs replacement. Additionally, if you are upgrading your insulation or changing the wall assembly significantly, installing a new, continuous WRB is a good practice to ensure proper moisture protection for your renovated facade.
Can I mix different siding or cladding materials on one facade?
Yes, mixing materials is a common design approach that can add visual interest and texture to a facade. For example, you might combine Thermally Modified Wood cladding with stone or metal accents. When mixing materials, it's crucial to consider their compatibility, how they interact at transition points, and to ensure proper flashing and detailing to prevent water intrusion.
Ready to Transform Your Missoula Facade?
Request a material quote with your project dimensions, desired profile, and ZIP code to confirm current availability and service options for your siding and cladding needs. Explore our range of Thermally Modified Wood, Maximo Accoya, Brazilian hardwoods, and Norx composite options.
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