Siding and Cladding for Facade Renovations in Phoenix, AZ

Understanding Your Existing Wall Structure

The first step in any facade renovation is to thoroughly understand the existing wall structure. This goes beyond a visual inspection and often requires opening up small sections of the wall to reveal the underlying components. Key elements to identify include:

**Substrate Material:** Is the existing wall framed with wood or metal studs? Is there a masonry block wall? The substrate dictates the type of fasteners and attachment methods suitable for your new siding or cladding.

**Sheathing:** What type of sheathing is present? Plywood, OSB, or gypsum-based sheathing will have different properties and requirements for moisture protection and attachment strength.

**Weather Resistive Barrier (WRB):** Identify the existing WRB. Is it house wrap, building felt, or an integrated sheathing product? Its condition and type will inform whether it needs to be replaced or supplemented.

**Insulation:** Note the type and condition of any existing insulation. A renovation can be an opportune time to upgrade insulation for improved energy performance, especially in Phoenix's climate.

**Flashing Details:** Pay close attention to existing flashing around windows, doors, and other penetrations. Proper flashing is critical for preventing water intrusion, and these details often need to be upgraded or replaced during a renovation.

Assessing Environmental Factors in Phoenix

Phoenix's climate presents specific challenges for exterior materials. High temperatures, intense UV radiation, and low humidity levels must be considered when selecting siding and cladding materials.

**Solar Exposure:** South and west-facing walls in Phoenix receive prolonged, intense sun exposure. Materials on these elevations will experience significant thermal expansion and contraction, as well as accelerated UV degradation. Selecting materials with good UV stability and dimensional stability is paramount.

**Temperature Extremes:** The large diurnal temperature swings in Phoenix can stress materials. Consider materials that can accommodate these changes without warping, cracking, or delaminating.

**Dust and Wind:** Phoenix can experience dust storms and strong winds. The facade design should minimize areas where dust can accumulate and ensure materials are securely fastened to resist wind uplift. Smooth, easy-to-clean surfaces may be beneficial.

Choosing Siding and Cladding Materials for Phoenix

Lumber Plus offers a range of siding and cladding options that can be suitable for a Phoenix facade renovation, each with distinct characteristics.

**Thermally Modified Wood:** Products like Thermally Modified Ayous or Ash offer enhanced dimensional stability and resistance to decay, making them a consideration for the Phoenix climate. The thermal modification process makes the wood less prone to expansion and contraction, which can be beneficial under intense solar exposure. These woods can be finished or allowed to weather naturally to a silver-gray patina. Explore options at: [https://lumberplus.com/thermally-modified-wood](https://lumberplus.com/thermally-modified-wood)

**Maximo Accoya:** This acetylated wood product offers exceptional dimensional stability and durability. Accoya is known for its resistance to rot and insects, and its stability makes it highly suitable for applications where consistent performance under varying temperatures is critical. Its ability to hold finishes well can also be an advantage in maintaining a desired aesthetic. Learn more at: [https://lumberplus.com/products/maximo-accoya](https://lumberplus.com/products/maximo-accoya)

**Norx Composite Cladding:** Composite materials, such as Norx, can offer consistent color and require minimal maintenance, which can be appealing in a dry, dusty environment. These products are engineered for durability and often come with UV-resistant formulations to combat sun exposure. See the collection at: [https://lumberplus.com/brands/norx](https://lumberplus.com/brands/norx)

**Brazilian Hardwoods:** Species like Ipe, Cumaru, and Garapa are naturally dense and durable. While they are robust, their performance in Phoenix's intense sun requires careful consideration of finishing and maintenance to manage color retention and surface checking. If left unfinished, they will weather to a silver-gray. Find details at: [https://lumberplus.com/siding-and-cladding](https://lumberplus.com/siding-and-cladding)

Ventilation and Rainscreen Assemblies

While rain may be infrequent in Phoenix, a ventilated rainscreen assembly is still a critical consideration for facade renovations. This system creates an air gap between the exterior cladding and the weather resistive barrier, allowing for drainage and promoting airflow.

**Moisture Management:** Even in a dry climate, incidental moisture from condensation, irrigation, or rare rain events can occur. The air gap allows any trapped moisture to dry out, preventing potential moisture-related issues within the wall assembly.

**Thermal Performance:** The air gap can also contribute to the thermal performance of the wall by creating a thermal break, potentially reducing heat transfer into the building during hot Phoenix summers. This can improve energy efficiency and comfort.

**Material Longevity:** Ventilation helps to equalize pressure across the wall and reduces the temperature of the cladding material itself, which can contribute to the longevity of the siding or cladding by mitigating some of the stress from extreme heat.

Worked Example: Facade Renovation on a Phoenix Residence

Consider a hypothetical single-story Phoenix home, built in the 1980s, with stucco exterior walls. The homeowner wants to update the facade with a modern wood look, focusing on the main front elevation and a west-facing accent wall. The existing stucco is showing hairline cracks, and the wall assembly is presumed to be stucco directly over wire lath and building felt, attached to wood studs.

**Existing Conditions Assessment:** Initial investigation reveals 2x4 wood stud framing at 16 inches on center, covered with 1/2-inch plywood sheathing. A single layer of asphalt-impregnated felt paper (building paper) acts as the WRB. The stucco is approximately 7/8-inch thick. There are no obvious signs of water intrusion, but the building paper is brittle in exposed areas.

**Renovation Strategy:**

1. **Stucco Removal:** The existing stucco and wire lath are carefully removed to expose the plywood sheathing.

2. **WRB Upgrade:** The old building paper is removed. A new, high-performance weather resistive barrier, such as a self-adhering membrane or a mechanically fastened synthetic wrap, is installed over the plywood sheathing, ensuring all seams are properly lapped and taped.

3. **Flashing Replacement:** All window and door flashing is replaced and integrated with the new WRB to ensure a continuous moisture plane.

Insect screen is added at the top and bottom of the furring strips to prevent pest entry.

5. **Cladding Selection:** For the front elevation, Thermally Modified Ayous in a shiplap profile is chosen for its stability and modern aesthetic. For the west-facing accent wall, Maximo Accoya is selected due to its superior dimensional stability and UV resistance, even under direct, intense sun.

Corner trim details are carefully planned to achieve a clean finish.

This approach addresses both the aesthetic goals and the technical requirements for a durable facade renovation in the Phoenix climate, ensuring a robust wall assembly that can withstand local conditions.

Before you order

• Have you thoroughly investigated the existing wall assembly (substrate, sheathing, WRB, insulation, flashing)?
• Have you accounted for Phoenix's high temperatures, intense UV, and low humidity in material selection?
• Is a ventilated rainscreen assembly planned to manage moisture and improve thermal performance?
• Are all flashing details around openings being replaced or upgraded and properly integrated?
• Have you considered the long-term appearance and maintenance requirements of your chosen material?
• Is the chosen material compatible with the existing structural elements and attachment methods?
• Have you obtained specific installation guidelines for your selected siding or cladding 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 Phoenix, AZ. Ask our team to confirm availability, delivery to your ZIP code and which branch can support your order.

Questions to help you decide

Keep planning your project