The Short Answer

Both Gentek and CertainTeed manufacture strong vinyl siding options. CertainTeed is widely recognized for its broad national product portfolio and proprietary features. Gentek offers an equally compelling range of profiles, colors, coordinated accessories, and premium products—including the extra-heavy .046-inch Sequoia Select panel.

For contractors and homeowners in the Quad Cities, Gentek may offer an additional practical advantage when the selected products and colors are stocked locally. Immediate availability can reduce special-order delays, simplify color coordination, and help keep a remodeling or new-construction project moving forward.

Start With Independent Standards, Not Advertising

Manufacturer literature is useful, but a credible comparison should begin with recognized industry standards. ASTM D3679 is the primary product standard for rigid polyvinyl chloride vinyl siding. It addresses important characteristics such as materials, dimensional requirements, impact resistance, weatherability, expansion and shrinkage, surface distortion, and wind-load resistance.

The Polymeric Exterior Products Association, formerly known as the Vinyl Siding Institute, operates the VSI Product Certification Program. According to the association, certified vinyl siding products demonstrate compliance with the applicable ASTM product standard through independent certification bodies.

• ASTM D3679: Standard Specification for Rigid Polyvinyl Chloride Vinyl Siding.
• ASTM D5206: A laboratory test method used to evaluate the wind-load resistance of rigid vinyl siding.
• ASTM D4756: Standard practice covering the installation of rigid vinyl siding and soffit.
• VSI product certification: Independent verification that listed products comply with the applicable ASTM product requirements.

These standards create a common performance foundation, but they do not make every panel identical. Thickness, profile geometry, locking system, nail hem, color technology, and installation details can still differ substantially between individual products.

Gentek and CertainTeed at a Glance

Specifications vary by product, profile, color, fastener schedule, wall assembly, and installation method. Always verify the current technical literature for the exact product being considered.

Premium Comparison: Gentek Sequoia Select and CertainTeed Monogram

Gentek Sequoia Select and CertainTeed Monogram provide a useful premium-level comparison. Both are intended for homeowners who want more than a basic vinyl siding panel.

Gentek Sequoia Select

Gentek identifies Sequoia Select as an extra-heavy vinyl siding product with a nominal .046-inch wall thickness. Its published construction includes a full-roll nailing hem, Advantage Lock system, cedar-grain texture, and a pronounced lap height intended to create stronger shadow lines.

• Nominal .046-inch panel thickness
• Full-roll nail hem for strong wall attachment
• Advantage Lock system designed to improve panel stability
• Low-gloss cedar-grain appearance
• Multiple traditional profiles and coordinated accessories
• ChromaTrue technology on designated darker colors

CertainTeed Monogram

CertainTeed positions Monogram as a premium vinyl siding collection. The manufacturer highlights its CertaLock locking system, full rollover nail hem, STUDfinder installation system, low-gloss wood-grain appearance, and RigidForm 210 Technology.

• Premium rigid vinyl panel construction
• CertaLock locking system
• Full rollover nail hem
• STUDfinder installation indicators
• Low-gloss wood-grain appearance
• RigidForm 210 wind-load technology on the applicable product configuration

Standard Comparison: Gentek Concord and CertainTeed MainStreet

Gentek Concord and CertainTeed MainStreet demonstrate that a homeowner does not always need the most expensive product in a manufacturer’s portfolio to obtain a dependable, attractive, low-maintenance exterior.

Gentek publishes Concord with a nominal .042-inch thickness, a rolled nail hem, a secure panel-locking design, and multiple profile choices. CertainTeed describes MainStreet as a durable collection with a reinforced locking system, STUDfinder installation indicators, multiple profile options, and a lifetime limited warranty.

These lines can make sense for budget-conscious remodeling, rental properties, production building, garages, additions, and homes where the selected profile and color are more important than moving into a premium product tier.

Understanding Panel Thickness

Panel thickness is useful, but it should not be treated as a complete quality score. A heavier panel can feel more substantial and may provide greater rigidity, straighter wall appearance, and easier handling. However, the finished siding system is also affected by:

• The shape and depth of the siding profile
• The design of the locking system
• The strength and configuration of the nail hem
• Fastener type, spacing, and penetration
• Wall flatness and substrate preparation
• Allowances for thermal expansion and contraction
• Installation around windows, doors, corners, and penetrations

A properly installed .042-inch panel may perform better than an incorrectly installed .046-inch panel. Product selection matters, but installation quality remains decisive.

Wind Ratings Must Be Compared Carefully

Wind claims are one of the easiest areas to misunderstand. A laboratory wind-load result is not a promise that every installation will withstand that exact wind speed under every field condition.

Gentek states that Sequoia Select has been tested for negative wind-load resistance under ASTM D5206 and meets or exceeds the applicable industry standard. CertainTeed states that Monogram with RigidForm 210 Technology has been tested to withstand wind-load pressures associated with speeds up to 210 mph.

These statements should not be reduced to a simple headline comparison. Actual capacity can depend on the specific profile, building height, exposure category, wall location, fastener spacing, substrate, design pressure, and installation details.

Color, Texture, and Exterior Design

Both brands offer attractive colors and traditional profiles. The better design system is the one that creates a coordinated exterior across siding panels, corners, soffit, fascia, trim coil, shakes, and architectural accents.

Gentek’s Design Strengths

• A broad range of traditional and contemporary colors
• Color Clear Through coordination across designated products and accessories
• ChromaTrue fade-defying technology on designated darker colors
• Multiple clapboard, Dutch-lap, vertical, shake, and accent options
• Strong opportunities for locally stocked, coordinated materials

CertainTeed’s Design Strengths

• Extensive color and profile selection across multiple collections
• Low-gloss textures designed to resemble painted wood
• Clapboard, Dutch-lap, vertical, shake, shingle, and specialty choices
• Coordinated trim and accessory products
• Established visualization and color-planning resources

Printed brochures and computer screens cannot perfectly reproduce an installed color. Final selections should always be made from current physical samples viewed outdoors during different lighting conditions.

Installation Is as Important as the Manufacturer

Vinyl siding is designed to move as temperatures change. It should be hung securely while remaining free to expand and contract. Fasteners driven too tightly, insufficient clearance at trim, improper panel overlap, and poor wall preparation can cause buckling, distortion, loose panels, and water-management problems.

ASTM D4756 provides an industry-recognized installation practice for rigid vinyl siding and soffit. Manufacturer instructions then provide the product-specific details that installers must follow.

1. Prepare a flat, structurally sound substrate.
2. Install the required water-resistive barrier and flashing.
3. Position fasteners in the appropriate portion of the nail slot.
4. Leave the specified space between the fastener head and nail hem.
5. Provide the required clearance inside receiving channels.
6. Confirm that every panel is fully engaged without being stretched upward.
7. Follow the manufacturer’s profile-specific fastening schedule.

Neither brand can overcome careless installation. Conversely, a well-selected Gentek or CertainTeed product installed by a trained professional can provide an attractive, long-lasting exterior.

Comparing Warranty Coverage

Both manufacturers offer limited warranty coverage on qualifying vinyl siding products, but the word “lifetime” should never be evaluated by itself. Warranty value depends on the written terms.

Before purchasing, review:

• Who qualifies as the original owner
• Whether coverage can be transferred
• Whether transferred coverage becomes prorated
• How excessive fading is defined and measured
• Whether hail damage receives separate coverage
• Whether labor, removal, disposal, and freight are included or excluded
• Required registration and claim procedures
• Exclusions involving improper installation or abnormal conditions

Product literature is a helpful summary, but the current written warranty is the controlling document. Obtain and review it before making the final decision.

Local Availability Can Be a Major Performance Advantage

A strong siding specification is only useful if the correct panels, accessories, and replacement materials are available when the contractor needs them.

For Quad Cities contractors, Gentek’s local availability through Suburban Wholesale & Supply can be a meaningful advantage. Stocked colors and accessories may help contractors:

• Begin projects without waiting for distant special orders
• Replace damaged or mismeasured material more quickly
• Coordinate siding, corners, trim, soffit, and related accessories
• Reduce downtime for installation crews
• Avoid tying up unnecessary cash in excessive jobsite inventory
• Receive knowledgeable local product and installation support

This does not make CertainTeed an inferior product. It means that product availability and distributor support deserve a place beside thickness, color, and warranty when making a real-world purchasing decision.

Which Brand Should You Choose?

Final Comparison

Gentek and CertainTeed both manufacture credible vinyl siding products. Neither company should be judged by a single panel, warranty phrase, or advertised wind-speed number.

CertainTeed brings a broad product portfolio, strong national recognition, and useful proprietary features. Gentek brings competitive panel engineering, attractive color coordination, premium choices such as .046-inch Sequoia Select, and a significant practical advantage when products are supported by deep local inventory.

The smartest decision is to compare equivalent product lines, confirm current manufacturer specifications, verify certification, examine actual samples, review the written warranties, and select an experienced installer who follows ASTM practices and the manufacturer’s instructions.

Technical References

1. Polymeric Exterior Products Association — VSI Product Certification Program
2. ASTM International — ASTM D3679, Standard Specification for Rigid PVC Siding
3. Gentek — Sequoia Select Manufacturer Brochure and Published Specifications
4. CertainTeed — Monogram Product Information and Manufacturer Specifications
5. CertainTeed — MainStreet Product Information and Manufacturer Specifications

Product offerings, colors, specifications, test results, and warranty terms may change. Confirm all details using current United States manufacturer literature, certification listings, applicable building codes, and written warranties before ordering or installing siding. Wind-test results are configuration-specific and should not be interpreted as a universal field-performance guarantee.