Understanding Existing Wall Conditions and Substrate
The first step in any facade renovation is a comprehensive assessment of the existing wall. This involves more than just a visual inspection. You need to determine the current substrate material (e.g., brick, stucco, wood sheathing), its structural soundness, and any signs of moisture intrusion, rot, or insect damage. For properties in Nashville, particularly older ones, brick or wood siding are common existing facade materials. Understanding the original construction methods can inform how new materials will integrate.
Crucially, identify the presence and condition of any existing moisture barriers or weather-resistive barriers (WRBs). If the existing wall system is compromised, it's often necessary to address these issues before applying new siding or cladding. This might involve repairs to the sheathing, flashing, or even structural elements. Ignoring these underlying problems can lead to premature failure of the new facade and potential interior damage.
For brick facades, check for efflorescence (white powdery deposits), spalling (flaking or peeling), or deteriorating mortar joints. These indicate moisture issues or age. For wood siding, look for rot, warping, or insect damage, especially near the ground or around openings. A professional inspection can provide a detailed report and recommendations for preparing the substrate.
Material Selection: Thermally Modified Wood, Hardwood, and Composite
Lumber Plus offers a range of siding and cladding materials suitable for facade renovations, each with distinct characteristics. The choice depends on aesthetic goals, performance requirements, and maintenance expectations.
Thermally modified wood, such as Scandinavian Thermally Modified Wood, offers enhanced stability and durability compared to untreated wood, making it a good option for exterior applications. The thermal modification process alters the wood's cellular structure, improving its resistance to decay and dimensional changes. Options like thermally modified Ayous or Ash provide a clean grain and contemporary look. The material tends to be lightweight and can be milled into various profiles. This can be a strong candidate for those looking for a natural wood aesthetic with improved performance.
Brazilian hardwoods like Ipe, Cumaru, Garapa, Angelim, Jatoba, and Tigerwood provide a dense, durable, and naturally resistant option. These woods offer a range of colors and grain patterns, from the bold grain of Ipe to the golden tone of Cumaru. Their inherent density contributes to their strength and resistance to decay, making them suitable for facades that require impact resistance or a robust appearance. However, they typically require more substantial substructures due to their weight.
Norx composite cladding offers a low-maintenance alternative. Composite materials are engineered to resist rot, insects, and warping, and often come with pre-finished surfaces that eliminate the need for painting or staining. Norx composite cladding can mimic the appearance of wood while providing consistent color and texture. This is often chosen for projects prioritizing minimal upkeep and a consistent finish over time. Maximo Accoya, an acetylated wood product, also offers enhanced stability and durability, distinct from thermally modified wood, providing another high-performance wood option for cladding applications.
You can explore these options further at our general siding and cladding page: "Siding and Cladding" and specific products like "Thermally Modified Wood", "NORX Composite Cladding", and "Maximo Accoya".
Considering Rainscreen Assemblies for Moisture Management
For facade renovations, especially in climates with varying humidity and rainfall like Nashville, implementing a rainscreen assembly is a critical consideration. A rainscreen system creates a ventilated air gap between the exterior cladding and the weather-resistive barrier (WRB) on the structural wall. This gap allows moisture that penetrates the cladding to drain away and promotes airflow to dry out any incidental moisture, preventing it from reaching the underlying structure.
Even if the existing wall has a WRB, integrating a rainscreen can significantly improve the long-term performance and durability of the new facade. This is particularly important when installing new siding over an existing material or a compromised substrate. The air gap helps manage condensation and allows the wall to breathe, reducing the risk of mold, rot, and other moisture-related issues. When planning, ensure sufficient depth for the furring strips or battens that create this air gap. The benchmark for rainscreen facades is often considered to be a well-designed system that includes proper flashing and ventilation details.
Installation Over Existing Facades vs. Full Removal
A key decision in facade renovation is whether to install new siding or cladding directly over the existing facade or to remove the old material entirely. Each approach has advantages and disadvantages.
Installing over an existing facade, such as brick or old siding, can be more cost-effective and less disruptive, as it avoids demolition and disposal costs. However, it adds weight to the structure and requires careful assessment of the existing facade's condition. The new cladding must be securely fastened through the old material into the structural framing. This method also requires extending window and door jambs to accommodate the increased wall thickness, and verifying that the existing wall can support the additional load. For example, applying new cladding over a solid brick wall would require robust fastening into the mortar or directly into the brick, and careful consideration of the overall wall thickness.
Full removal of the existing facade allows for a thorough inspection and repair of the underlying sheathing, insulation, and WRB. This provides an opportunity to upgrade the wall's thermal performance and address any hidden issues. While more labor-intensive and costly upfront, it can lead to a more robust and energy-efficient wall system in the long run. This approach is often preferred when the existing facade is severely deteriorated or when significant upgrades to the building envelope are planned.
Worked Example: Facade Renovation on a Nashville Home
Consider a hypothetical 1,500 sq ft single-story home in Nashville with an existing painted T1-11 plywood siding facade that shows signs of delamination and paint failure. The homeowner desires a modern, low-maintenance look. After inspection, the underlying studs and sheathing are found to be sound, but the existing WRB is questionable.
The decision is made to remove the existing T1-11 siding to expose the sheathing. A new high-performance WRB will be installed, followed by vertical furring strips to create a rainscreen gap. The chosen material is Norx composite cladding in a London Black finish, known for its durability and consistent appearance. The home has a perimeter of 150 linear feet and an average wall height of 10 feet, for a total facade area of 1,500 square feet. Allowing for 10% waste and cuts around windows/doors, approximately 1,650 square feet of cladding material would be needed.
The Norx panels are 6 inches wide and come in 12-foot lengths. For the 1,650 square feet, this means roughly 3,300 linear feet of cladding. This translates to approximately 275 individual 12-foot boards (3300 LF / 12 LF per board). This detailed planning ensures all components are accounted for before ordering materials.
Before you order
- Assess existing facade material and condition (e.g., brick, wood, stucco).
- Inspect for structural integrity, moisture damage, rot, or pests.
- Evaluate existing weather-resistive barrier (WRB) and flashing.
- Decide between installing over existing facade or full removal.
- Consider the need for a rainscreen assembly for moisture management.
- Select siding/cladding material based on aesthetics, durability, and maintenance.
- Verify compatibility of new materials with existing structure and local climate.
- Plan for window/door jamb extensions if cladding over existing facade.
- Calculate material quantities, including waste factor and accessories (fasteners, flashing, furring strips).
- Confirm any local building code requirements for facade renovations.
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 Nashville, TN. Ask our team to confirm availability, delivery to your ZIP code and which branch can support your order.
Questions to help you decide
What are the common challenges when renovating a facade in Nashville?
Common challenges in Nashville facade renovations include managing moisture in a humid climate, addressing potential hidden damage in older homes (such as rot or pest issues behind existing siding), and ensuring proper integration with existing windows and doors. The varying seasonal temperatures also necessitate materials and assemblies that can withstand expansion and contraction without compromising the facade's integrity. Proper flashing and a well-designed rainscreen are particularly important.
Can I install new siding directly over old brick in Nashville?
Installing new siding directly over old brick is possible but requires careful planning. The brick must be structurally sound, and any failing mortar joints or moisture issues should be addressed first. You would typically install furring strips over the brick to create a level surface and a ventilation gap, then attach the new siding to these strips. This method adds thickness to the wall, requiring extensions for window and door frames, and the added weight must be considered. A structural review is recommended to ensure the existing foundation and wall can support the additional load.
What maintenance can I expect with different siding materials?
Maintenance varies significantly by material. Thermally modified wood and Brazilian hardwoods will naturally weather and may require periodic cleaning and optional re-oiling or sealing to maintain their original color, or they can be left to silver naturally. Composite cladding, such as Norx, is generally low-maintenance, typically only requiring occasional washing to remove dirt and grime. The specific maintenance guidelines for each product should be reviewed to ensure longevity and appearance.
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