The Professional 2.5"x3.5" Plain Downspout is engineered for maximum water flow capacity in commercial and large residential applications. Designed specifically for professional contractors and gutter installation businesses, this premium aluminum downspout provides superior performance for properties with extensive roof areas or regions with heavy rainfall.

Available in both 8ft and 10ft lengths and over 25 designer colors, this professional-grade rectangular downspout offers exceptional water handling capability while maintaining a clean, architectural appearance. The larger 2.5"x3.5" dimensions provide significantly increased flow capacity compared to standard downspouts, making it ideal for commercial buildings, large homes, and areas with high precipitation.

PRODUCT ADVANTAGES

• ✓ Enhanced Capacity: 8.75 sq. in. flow area for maximum drainage
• ✓ Professional Grade: Premium aluminum construction
• ✓ Commercial Quality: Ideal for larger structures
• ✓ Heavy Rainfall Performance: Superior water management
• ✓ Designer Colors: 25+ finish options to complement any exterior

White

Black

Dark Bronze

Navy Blue

Silver/Aluminum

ENHANCED CAPACITY DESIGN

The 2.5"x3.5" dimensions provide significantly greater water flow capacity compared to standard downspouts. This larger size is specifically engineered for commercial buildings, large residential properties, and areas with heavy rainfall where standard downspouts may be insufficient.

Capacity Benefits:

• 8.75 square inches of flow capacity (46% more than standard 2"x3" downspouts)
• Handles water from up to 1,200 square feet of roof area
• Ideal for commercial buildings and large homes
• Superior performance during heavy rainfall events
• Reduces the risk of overflow and water damage

PREMIUM ALUMINUM CONSTRUCTION

Our Professional 2.5"x3.5" Plain Downspouts are crafted from premium-grade aluminum with a durable powder-coated finish. This commercial-quality construction ensures exceptional durability, weather resistance, and long-term performance in all climate conditions.

Construction Benefits:

• Heavy-gauge aluminum for superior strength
• Precision manufacturing for consistent quality
• UV-resistant powder coating prevents fading and chalking
• Corrosion-resistant for coastal and high-moisture environments
• Designed for 20+ years of service life

COMMERCIAL-GRADE PERFORMANCE

These downspouts are specifically designed to meet the demanding requirements of commercial applications and large-scale residential projects. The enhanced capacity and durable construction ensure reliable performance even in the most challenging conditions.

Performance Benefits:

• Meets commercial building specifications
• Handles high-volume water flow efficiently
• Reduces the number of downspouts needed for large structures
• Minimizes the risk of system failure during extreme weather
• Provides peace of mind for critical drainage applications

PROFESSIONAL INSTALLATION

Designed with professional contractors in mind, these larger downspouts integrate seamlessly with commercial gutter systems. The standard rectangular design works with specialized 2.5"x3.5" brackets and accessories for secure, professional installation.

Installation Advantages:

• Compatible with specialized 2.5"x3.5" brackets and straps
• Works with commercial-grade elbows and connectors
• Available in 8ft and 10ft lengths for installation flexibility
• Can be cut to custom lengths on-site
• Designed for efficient professional installation

PROFESSIONAL TIP:

Due to the larger size and weight of 2.5"x3.5" downspouts, use heavy-duty brackets and fasteners appropriate for commercial applications. Space brackets every 3 feet (rather than the standard 4 feet used with smaller downspouts) to provide adequate support. For commercial installations, consider using rivets at connections for additional strength and durability.

PRODUCT SPECIFICATIONS

COMPATIBILITY & APPLICATIONS

For our commercial projects and larger residential installations, we exclusively use the 2.5"x3.5" downspouts. The increased capacity is essential for proper water management on larger structures. We've installed hundreds of these systems, and they consistently outperform standard downspouts in heavy rainfall conditions.

We switched to these larger 2.5"x3.5" downspouts for all our commercial projects after experiencing issues with standard sizes during heavy rainfall events. The difference is remarkable - these larger downspouts handle the water volume with ease, even during the most intense storms. For nationwide projects, the 8ft sections ship easily, while we use the 10ft sections for local installations.

As a contractor specializing in large custom homes in the Pacific Northwest, proper water management is critical. These 2.5"x3.5" downspouts have become our standard offering for homes over 3,500 square feet. The enhanced capacity handles our heavy rainfall perfectly, and the quality of construction is consistently excellent. Worth every penny for the peace of mind they provide.

Q: What is the difference between 8ft and 10ft sections?

A: Both 8ft and 10ft sections are identical in material, construction, and quality. The primary differences are length and shipping availability. The 10ft sections provide fewer seams in your installation but are only available for local delivery or pickup due to shipping carrier restrictions. The 8ft sections are available for nationwide shipping, making them accessible to customers outside our local delivery area.

Q: How much more water can a 2.5"x3.5" downspout handle compared to a standard 2"x3" downspout?

A: A 2.5"x3.5" downspout has approximately 8.75 square inches of flow capacity, which is about 46% more than the 6 square inches provided by a standard 2"x3" downspout. This significant increase in capacity allows each downspout to handle water from up to 1,200 square feet of roof area (compared to about 600-800 square feet for standard downspouts). This makes the larger size ideal for commercial buildings, large homes, and areas with heavy rainfall where efficient water management is critical.

Q: Do I need special brackets for these larger downspouts?

A: Yes, these 2.5"x3.5" downspouts require specialized brackets designed specifically for this larger size. Standard 2"x3" downspout brackets will not fit properly. We offer compatible heavy-duty brackets in matching colors, sold separately. Due to the larger size and weight of these downspouts, we recommend installing brackets every 3 feet (rather than the standard 4 feet used with smaller downspouts) to provide adequate support, especially in areas with heavy snow or ice loads.

Q: Are these downspouts compatible with standard gutters?

A: These 2.5"x3.5" downspouts are primarily designed to work with 6" and 7" commercial gutters. However, they can be adapted to work with standard 5" and 6" residential gutters using the appropriate adapter fittings. When connecting to standard gutters, it's important to use the correct size adapter to ensure proper water flow and prevent leaks. For optimal performance, we recommend using these larger downspouts with appropriately sized commercial gutters that can deliver the water volume these downspouts are designed to handle.

Q: Why are 10ft sections only available for local pickup or delivery?

A: Due to shipping carrier restrictions and the risk of damage during transit, 10ft downspout sections are only available for local delivery or pickup. The longer length makes these sections difficult to ship without bending or damage. For customers outside our local delivery area, we offer 8ft sections that can be safely shipped nationwide while maintaining product quality and integrity.

VISIT OUR SHOWROOM

Come see our complete line of commercial-grade gutter products and accessories at our showroom. Our specialists are available to answer your questions and provide personalized recommendations for your project needs.

Location: 19759 SE Sunnyside Rd, Damascus, OR 97089
Hours: Monday-Saturday: 8:00 AM - 4:00 PM
Support: Send message for assistance

SHIPPING & PICKUP

• 8ft Sections: Available for nationwide shipping
• 10ft Sections: Available for local pickup/delivery only
• Local Pickup: Available at our Damascus, OR location
• Pickup Timing: Usually ready in 2-4 days
• Local Delivery: Available within our service area