Choosing the right wood for Arizona’s harsh climate can make the difference between a project that lasts for decades and one that needs repairs far sooner than expected.
When planning an outdoor project in Arizona, one of the first questions homeowners and contractors ask is:
“Should I use pressure-treated lumber or redwood?”
It’s a great question—and the answer isn’t always as straightforward as you might think.
Arizona’s intense sun, low humidity, and seasonal monsoon rains create a unique environment for outdoor wood structures. The material that’s perfect for a coastal climate may not be the best choice here in the desert.
At Miller Wholesale Lumber, we help contractors and homeowners choose the right products for Arizona projects every day. Here’s what you should know before starting your next deck, pergola, fence, or outdoor living space.
Pressure-treated lumber begins as regular wood, most commonly Southern Yellow Pine, that is placed in a pressurized chamber where preservatives are forced deep into the wood fibers.
These preservatives help protect the lumber against:
The treatment doesn’t make the wood waterproof, but it significantly improves its durability in outdoor applications.
Redwood is a naturally durable softwood that contains natural compounds that help resist:
Unlike pressure-treated lumber, redwood doesn’t rely on chemical preservatives for its resistance.
Many homeowners choose redwood because of its:
It’s often considered one of the most beautiful woods available for outdoor construction.
Arizona presents some unique challenges for wood products.
Throughout much of the state, outdoor lumber is exposed to:
These conditions can cause wood to:
No wood is completely immune to Arizona’s climate, but some products perform better depending on the application.
Pressure-treated lumber is specifically designed for ground contact and outdoor environments where moisture exposure is common.
For projects that touch the ground or remain exposed to the elements, it’s often the preferred structural material.
One of the biggest advantages is affordability.
Pressure-treated lumber generally costs less than redwood, making it a practical option for:
Pressure-treated lumber is widely available in a variety of dimensions, making it easy to source for projects of nearly any size.
Pressure-treated lumber may:
For projects where appearance is the main priority, many homeowners choose to use pressure-treated lumber for the structural framing while selecting another material for the visible surfaces.
There’s no denying it—redwood is stunning.
Its warm reddish tones and attractive grain make it a favorite for:
Many homeowners leave redwood unfinished simply because of its natural beauty.
Redwood contains natural compounds that help protect it against insects and decay without pressure treatment.
Redwood is known for having good dimensional stability, which can help reduce excessive movement when properly installed and maintained.
The biggest drawback for many projects is cost.
Redwood is typically more expensive than pressure-treated lumber.
It also benefits from regular maintenance if you want to preserve its rich color. Without protection, exposure to Arizona’s intense sunlight will gradually weather redwood to a silver-gray color. Some homeowners enjoy this natural look, while others prefer to maintain the original appearance with UV-protective finishes.
This is probably the question we hear most often.
The honest answer is:
Both materials can provide many years of service when they’re used appropriately and maintained properly.
The better choice depends on:
For example:
A decorative pergola may benefit from the appearance of redwood.
A deck’s structural framing is commonly built using pressure-treated lumber because of its durability and value.
Recommended: Pressure-Treated Lumber
The framing is hidden beneath the decking, making durability and structural performance the primary priorities.
Recommended: Redwood or Pressure-Treated Lumber
If aesthetics are important, redwood offers a beautiful natural finish.
If budget is a bigger concern, pressure-treated lumber provides excellent durability.
Either material can work well.
Pressure-treated lumber offers outstanding value.
Redwood provides a more premium appearance.
Many gardeners today choose naturally durable wood species or products specifically intended for garden use. Material selection should match the intended application and any applicable recommendations for growing edible plants.
No matter which material you choose, maintenance plays a major role in longevity.
For Arizona projects:
✔ Apply quality exterior finishes when appropriate.
✔ Keep water from pooling around wood.
✔ Inspect fasteners annually.
✔ Clean surfaces to remove dirt and debris.
✔ Refinish as recommended by the product manufacturer.
Even the highest-quality lumber performs better when properly maintained.
Every outdoor project is different.
Whether you’re building a backyard pergola, a custom deck, or a large commercial project, selecting the right materials from the beginning can save time, money, and future repairs.
At Miller Wholesale Lumber, we supply Arizona contractors with quality building materials, including:
Our experienced team can help you choose materials that fit your project, your budget, and Arizona’s unique climate.
When it comes to pressure-treated lumber vs. redwood, there isn’t a single “best” answer for every project.
If your priority is durability, structural performance, and value, pressure-treated lumber is often the right choice.
If you’re looking for a premium appearance and natural beauty for a visible outdoor feature, redwood may be worth the investment.
The most successful Arizona projects often combine both—using pressure-treated lumber where strength and durability matter most, and selecting premium materials where appearance takes center stage.
At Miller Wholesale Lumber, we’re here to help you choose the right products for every build. Whether you’re an experienced contractor or planning your next outdoor project, our team is ready to help you build with confidence.
Yes. Pressure-treated lumber performs well in Arizona and is commonly used for decks, fences, and outdoor structural applications because it resists decay and insect damage.
Redwood is naturally durable, but Arizona’s intense UV exposure will gradually fade its color unless it’s protected with an exterior finish.
Neither is universally better. Pressure-treated lumber is often the best value for structural applications, while redwood is prized for its natural appearance and is commonly chosen for visible architectural features.
Yes, but it’s important to allow new pressure-treated lumber to dry sufficiently before applying paint or stain. Follow the finish manufacturer’s recommendations for the best results.
