The Importance of a Thorough Wall Assessment
Before any new siding or cladding is considered, a comprehensive assessment of the existing wall assembly is essential. This includes checking for structural integrity, moisture intrusion, air leakage, and insulation deficiencies. In Salem's climate, which can feature significant rainfall, understanding how water has managed or mismanaged within the wall is particularly important.
A proper assessment helps identify potential problems that could be exacerbated by new cladding, or opportunities to improve the building's overall performance during the renovation. This step is not just about removing the old, but understanding what needs to be remedied or preserved beneath it.
Identifying Existing Substrate Materials and Condition
The type and condition of the existing substrate material will dictate how new siding and cladding can be attached and supported. Common substrates include plywood, OSB, gypsum sheathing, or even older plank sheathing. Inspect for signs of rot, delamination, insect damage, or excessive moisture. Any compromised sections must be repaired or replaced.
For example, if the existing sheathing shows signs of water damage near windows or at the base of the wall, addressing these specific areas before installing new cladding is crucial. This might involve replacing a section of sheathing and verifying proper flashing around openings.
Evaluating Moisture Management and Weather Barriers
A functioning weather-resistive barrier (WRB) is fundamental to a durable facade. During renovation, assess the existing WRB's condition. Is it intact, or are there tears, punctures, or areas where it has deteriorated? If the existing barrier is compromised or non-existent, installing a new WRB or integrating one into the new wall assembly is a key step.
Consider the potential for a rainscreen system, especially with materials like thermally modified wood or Maximo Accoya. A rainscreen creates a ventilated air gap behind the cladding, allowing moisture to drain and walls to dry, which is highly beneficial in environments with frequent precipitation. This approach can significantly enhance the long-term performance of your facade. (S1)
Lumber Plus offers various siding and cladding options suitable for rainscreen applications, including [Thermally Modified Wood](/thermally-modified-wood) and [Maximo Accoya](/products/maximo-accoya).
Structural Considerations and Fastening Points
The weight and fastening requirements of your chosen siding and cladding must be compatible with the existing structural framing. Verify the spacing and condition of studs or other structural elements to ensure they can adequately support the new materials. For heavier cladding options, additional blocking or reinforcement may be necessary.
For example, if you are replacing lightweight vinyl siding with a more substantial material like a dense hardwood or composite cladding, the existing framing might need to be reinforced to meet the increased load. This is especially true for vertically oriented profiles that rely on consistent stud attachment.
Worked Example: Facade Renovation on a Salem Home
Consider a hypothetical 1970s single-story home in Salem, OR, with existing T1-11 plywood siding that shows signs of deterioration, particularly at the base and around windows. The homeowner wants to upgrade to a more modern, durable aesthetic using Norx composite cladding with a vertical profile.
There is evidence of moisture staining on the lower portions of the studs.
**Required Upgrades:**
1. **Moisture Management:** Install a new continuous weather-resistive barrier over the existing sheathing. Given Salem's rainfall, a drainable WRB or a separate furring strip system to create a rainscreen cavity is highly recommended.
2. **Insulation:** Add exterior rigid insulation to improve thermal performance, as the original wall likely has minimal cavity insulation.
3. **Substrate Repair:** Replace any sections of the T1-11 plywood that show rot or significant damage, ensuring a sound, flat surface for the new WRB and furring.
4. **Furring Strips:** Install vertical furring strips, typically 3/4-inch thick, directly over the WRB and insulation, fastened into the existing studs. These strips create the necessary ventilation gap for the rainscreen and provide solid attachment points for the new Norx composite cladding.
5. **Flashing:** Upgrade all window and door flashing to integrate with the new WRB and rainscreen assembly, diverting water effectively to the exterior.
This comprehensive approach addresses the underlying issues, improves energy efficiency, and ensures the Norx composite cladding (such as [Norx composite cladding](/brands/norx)) performs as intended for decades.
Before you order
- Inspect existing siding for signs of damage, rot, or insect infestation.
- Evaluate the condition of the underlying sheathing (plywood, OSB, etc.).
- Assess the presence and integrity of the existing weather-resistive barrier.
- Check for proper flashing around windows, doors, and other penetrations.
- Verify the spacing and condition of structural framing (studs).
- Consider the need for additional insulation or a rainscreen assembly.
- Account for the weight and fastening requirements of the new cladding material.
- Plan for proper drainage and ventilation for the new facade system.
- Identify areas requiring repair or replacement before new cladding installation.
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 Salem, OR. 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 a rainscreen and why is it important for facade renovations?
A rainscreen is an exterior wall assembly that includes an air gap between the outer cladding and the weather-resistive barrier. This gap allows moisture to drain away and promotes ventilation, helping the wall dry out. It's especially important in climates like Salem, OR, with frequent rain, as it enhances durability, prevents moisture-related issues, and can improve thermal performance. Many of Lumber Plus's siding and cladding options, including thermally modified woods and composites, are suitable for rainscreen applications.
Do I need to remove all existing siding before installing new cladding?
In most facade renovations, it is advisable to remove all existing siding to properly assess the underlying wall conditions, make necessary repairs to the sheathing and framing, and install a continuous weather-resistive barrier. While some local codes may permit overlaying certain types of siding, a full removal ensures a sound foundation for the new facade and allows for crucial upgrades to moisture management and insulation. Always confirm with local building codes.
How do I choose the right cladding material for my Salem renovation?
Choosing the right cladding material involves balancing aesthetics, durability, maintenance requirements, and compatibility with your existing wall structure and budget. Consider materials that perform well in Salem's climate, such as thermally modified wood for stability and a natural look, durable Brazilian hardwoods like Ipe or Cumaru, or low-maintenance Norx composite cladding. Evaluate how each material integrates with potential rainscreen systems and your desired architectural style. Consulting with a professional can help match your needs with suitable options from our selection of [Siding and Cladding](/siding-and-cladding).
Request a Material Quote for Your Facade Renovation
Ready to transform your Salem, OR facade? Provide your project dimensions, desired siding or cladding profile, and ZIP code to request a material quote. We can help confirm current availability and service options for your renovation project.
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