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- Heritage Deck Framing (UC4B)
- 2×8
- 2×10
- 2×12
- 6×6
- Cost per Linear Foot
- $2.40
- $3.30
- $4.00
- $8.00
Build it Right- From the Start.
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Inspired by the durability and longevity of CCA-era lumber.
Engineered for the decks of today.
(actual longevity will vary based on care, exposure and climate)
Tech Specs To Back it Up!
The technical data and material properties referenced on this page are sourced from the most credible and widely accepted industry publications, including standards developed specifically for engineering and professional use. These include grading and design values from the Southern Pine Inspection Bureau (SPIB), and treatment and construction guidelines from the Southern Forest Products Association (SFPA). Specific tables and descriptions are drawn from SPIB’s Standard Grading Rules and SFPA’s Marine Construction Guide (2023), as well as international export references such as the Southern Yellow Pine Export Grades Manual and Guide to American Softwoods.
BWDepot does not claim ownership of these publications. For complete technical details, definitions, and official tables, please refer directly to the issuing organizations via the links above.
Preservative Retention & Use Category (UC4B vs. UC4A)
Heritage Deck Framing is pressure-treated with Micronized Copper Azole (MCA) to a minimum retention of 0.23 pounds per cubic foot (pcf), with some stock reaching up to 0.31 pcf. This exceeds the threshold for AWPA Use Category 4B (UC4B) — a classification reserved for “critical structural components” such as beams and joists installed in ground contact or wet service conditions.
Heritage Deck Framing is pressure-treated to the UC4B level — the highest standardized retention category for ground-contact structural use
📌 Citation:
Marine Guide, SFPA 2023, p. 2–3
Treatment meets or exceeds MCA retention requirements for UC4B use, with values ranging from 0.23 to 0.31 pcf.
📌 Citation:
Marine Guide, SFPA 2023, p. 3
By comparison, most framing sold through retail lumberyards and big-box suppliers is treated to UC4A standards, often with just 0.15 pcf MCA. While acceptable for light-duty ground contact, UC4A framing is not rated for the structural longevity demands of high-moisture zones, marine climates, or buried installations. Additionally, UC4A-treated framing has consistently failed to match the long-term durability of today’s decking materials — including hardwoods and composites — even under normal conditions.
Bottom line: UC4B framing provides 50–100% more preservative protection, enabling decades of service life where UC4A lumber often fails in under 10 years. More on that, read on.
Longevity and Durability Expectations
Heritage Deck Framing is engineered for long-term structural integrity, even in demanding environments with ground contact, splash exposure, or chronic moisture. Each piece is treated with Micronized Copper Azole (MCA) to meet or exceed AWPA Use Category UC4B, with retention levels between 0.23 and 0.31 pounds per cubic foot (pcf) — the standard required for critical structural elements like joists and beams in wet-service conditions.
According to industry guidelines, Southern Pine treated to UC4B retention levels using approved preservatives such as MCA or ACQ is expected to deliver 30 years or more of structural performance in severe exposure conditions.
— Interpretation based on Tech SYP Marine & AWPA UC Standards
📌 Citation:
Marine Guide, SFPA 2023, p. 2–5
By contrast, standard UC4A-treated framing — typically found in retail lumberyards — is intended for general ground contact and often begins to fail in as little as 5 to 10 years in humid, poorly drained, or high-decay environments, especially in the Southeastern U.S.
Bottom line: UC4B-treated framing like Heritage provides 2–3 times the lifespan of standard UC4A lumber — dramatically reducing long-term risk and replacement costs.
Grade #1 vs. Grade #2 Strength Advantage
All Heritage Deck Framing components are manufactured exclusively from #1 Grade Southern Yellow Pine — a structural grade that provides higher strength, stiffness, and reliability compared to the commonly used #2 Grade lumber. This upgrade isn’t just cosmetic — it’s about dependable, code-recognized performance.
How It Compares
| Strength Category | #1 Grade | #2 Grade | Advantage |
|---|---|---|---|
| Bending Strength (Fb) | 1,200 psi | 1,050 psi | +14% Stronger |
| Compression Parallel | 1,150 psi | 1,075 psi | +7% More Load Capacity |
| Modulus of Elasticity | 1.6M psi | 1.5M psi | +6.7% Stiffer |
Compared to #2 Grade, #1 Grade Southern Pine offers +14% more bending strength, +7% more compressive strength, and +6.7% greater stiffness.
📌 Citation:
SPIB Standard Grading Rules Table 1A (see also Export Grades Manual)
Why It Matters
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Resists sagging and deflection under load
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Reduces risk of long-term warping and deformation
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Provides more consistent and predictable structural performance
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Fewer knots and tighter grain for improved strength and fastener retention
Bottom line: Grade #1 lumber makes your frame stronger. Heritage Deck Framing uses only #1 Grade Southern Yellow Pine — no compromises. That means tighter grain, fewer defects, and performance numbers that meet or exceed structural engineering standards.
When it comes to strength, stiffness, and durability, #1 Grade wins — and your deck lasts longer because of it.
Superior Rot Resistance in the Southeast
The Southeastern U.S. is one of the most aggressive environments in the country for wood decay, due to its high humidity, rainfall, warm temperatures, and extended wet seasons. That’s why Heritage Deck Framing is built using UC4B-rated lumber with enhanced copper-based preservatives that resist decay fungi, termites, and microbial degradation — even in wet soil or ground-contact installations.
“Accelerated decay is common in southern coastal or wet environments, particularly when retention values are below 0.23 pcf. Structural failure can occur in as little as 5 years.”
📌 Citation:
Summarized from, Marine Guide, SFPA 2023
Most framing lumber sold at retail and contractor yards is treated only to UC4A, with minimal retention levels (typically 0.15 pcf). In Southeastern conditions, UC4A-treated lumber has been documented to rot in as little as 4 to 7 years, especially when installed without optimal drainage or airflow.
Bottom line: Heritage Deck Framing is built for the realities of the Southern climate — resisting rot where others fail, and delivering decades of reliable, decay-resistant performance in the harshest environments.
No Incising Required — Superior Preservative Penetration
Southern Yellow Pine, the backbone of Heritage Deck Framing, has a naturally treatable cellular structure that allows preservatives to penetrate deeply without the need for mechanical incising — a process that weakens many competing wood species by cutting slits into their surface to help chemicals absorb.
“Southern Pine is one of the few wood species that does not require incising prior to treatment… allowing deep, uniform penetration.”
📌 Citation:
Marine Guide, SFPA 2023, p. 4
Other framing products — especially those made from Douglas Fir, Hem-Fir, or SPF — must be incised to meet treatment standards. These slits not only reduce fastener-holding strength but also create unsightly textures and potential failure points in structural framing.
Bottom line: Heritage Framing uses Southern Pine’s natural treatability to deliver maximum preservative protection with no surface weakening — a clean, strong, and better-looking solution.
Environmentally Responsible Building Material
Just like the Premium Brazilian Hardwoods Industry where BWDepot has long been a veteran leader, Heritage Deck Framing isn’t just engineered for performance — it’s also a responsible choice for long-term environmental sustainability. Pressure-treated Southern Yellow Pine is renewable, recyclable, biodegradable, and among the most energy-efficient structural materials available.
“Wood is reusable, recyclable, and biodegradable… It takes far less energy to manufacture wood than steel or concrete.”
📌 Citation:
Marine Guide, SFPA 2023
Southern Pine is sourced from rapidly regenerating forests in the Southeastern U.S., where more trees are planted each year than are harvested. In fact, growing forests actively remove carbon dioxide from the atmosphere while producing the oxygen we depend on.