Gentek Sequoia Select and ASCEND Composite Cladding both offer attractive, low-maintenance exteriors, but they serve different design and performance priorities. Compare their construction, profiles, ASTM testing, installation requirements, warranties and overall value.
Exterior Cladding Comparison
Gentek Vinyl Siding vs. ASCEND Composite Cladding
Gentek Sequoia Select vinyl siding and ASCEND Composite Cladding both offer handsome, low-maintenance alternatives to traditional painted wood. The difference is not simply a matter of which product is “better.” Each system approaches exterior design, thermal performance, installation and value from a different direction.
This positive comparison uses Gentek Sequoia Select as the representative Gentek product and reviews both options using current manufacturer specifications, applicable ASTM test methods and the standards framework maintained by the Polymeric Exterior Products Association, formerly known as the Vinyl Siding Institute.
The Short Answer
Gentek Sequoia Select is an especially practical choice when the project calls for premium vinyl siding, numerous profile options, straightforward maintenance and an attractive installed cost. Its nominal .046-inch horizontal panels, full-roll nail hem, Advantage Lock system and coordinated color program make it a strong whole-home siding option.
ASCEND is compelling when the design calls for a thicker, flatter wood-plank appearance, a taller 7-inch exposure or a wide 12-inch board-and-batten profile. Its glass-reinforced polymer and graphite-infused polystyrene construction also provides published thermal resistance and fire-test results that are distinct from conventional vinyl siding.
Both are credible low-maintenance products. Gentek emphasizes familiar vinyl-siding versatility and value, while ASCEND emphasizes composite construction, dimensional wood styling and added thermal performance.
An Important Product-Category Distinction
Sequoia Select is rigid PVC vinyl siding. ASCEND is a proprietary composite cladding made with glass-reinforced polymer and graphite-infused polystyrene. Because the products belong to different material categories, one standard should not automatically be applied to both.
Gentek Sequoia Select
- Rigid PVC vinyl siding
- Horizontal clapboard and Dutch-lap profiles
- Vertical board-and-batten profile
- Evaluated within the vinyl-siding standards framework
ASCEND Composite Cladding
- Glass-reinforced polymer composite facing
- Graphite-infused polystyrene backing
- 7-inch horizontal plank and 12-inch board-and-batten profiles
- Evaluated through product-specific testing and code reports
How VSI and ASTM Standards Apply
The VSI Product Certification Program is now administered by the Polymeric Exterior Products Association. It uses independent, ISO/IEC 17065-accredited certification bodies to verify compliance with standards applicable to specific polymeric siding categories.
PEPA identifies ASTM D3679 as the product specification for rigid PVC siding. That makes ASTM D3679 directly relevant to qualifying vinyl siding products such as Gentek’s rigid PVC siding. The standard addresses characteristics including dimensions, impact resistance, weathering, expansion and other performance requirements.
ASCEND is not conventional rigid PVC siding, so ASTM D3679 should not be presented as its governing product specification. ASCEND instead publishes product-specific test data and code-compliance documentation, including ICC-ES ESR-4449 and Intertek CCRR-0316.
Gentek vs. ASCEND at a Glance
| Comparison | Gentek Sequoia Select | ASCEND Composite Cladding |
|---|---|---|
| Material | Rigid PVC vinyl siding | Glass-reinforced polymer with graphite-infused polystyrene |
| Horizontal profiles | Double 4-inch clapboard, Double 4½-inch Dutch lap, Double 5-inch clapboard and Double 5-inch Dutch lap | 7-inch flat-face composite plank |
| Vertical profile | 7-inch board and batten | 12-inch board and batten with an integral batten |
| Projection | ¾-inch horizontal lap height | ¾-inch plank or panel projection |
| Published thickness | .046-inch nominal horizontal panels; manufacturer currently lists .050-inch nominal for 7-inch board and batten | Not meaningfully compared using vinyl panel thickness because ASCEND is a backed composite assembly |
| Published R-value | No standalone siding R-value published for Sequoia Select | Up to R-2.0 for the 7-inch plank when applied directly over sheathing; R-1.6 is listed for the board-and-batten profile |
| Finish | Low-gloss cedar-grain horizontal finish; light rough-sawn board-and-batten texture | Cedar-mill grain or matte finishes, depending on profile and current availability |
| Maintenance | No routine painting; periodic gentle cleaning | No routine painting; periodic gentle cleaning |
| Residential warranty | Lifetime limited, non-prorated for the original qualifying owner, transferable subject to prorated terms; fade and hail provisions are included | Lifetime limited for the original qualifying owner, with transferability provisions, fade protection, five-year labor provisions and specified hail protection |
Specifications and warranty terms may change. Confirm the selected profile, color, production date, installation location and current written warranty before ordering.
Appearance and Architectural Character
Where Gentek Stands Out
Sequoia Select offers four traditional horizontal configurations. That selection gives homeowners more freedom to preserve the familiar scale of Colonial, ranch, Cape Cod and traditional Midwestern homes.
- Multiple clapboard and Dutch-lap exposures
- Low-gloss cedar-grain surface
- Deep ¾-inch lap height for stronger shadow lines
- Horizontal and vertical profiles within one collection
- Coordinated siding, soffit, fascia, trim and rainware colors
Where ASCEND Stands Out
ASCEND is designed for homeowners who prefer the broad, flat face of painted wood cladding. Its 7-inch plank has a defined butt edge, while its 12-inch board-and-batten panel creates a wider contemporary rhythm.
- Tall 7-inch horizontal exposure
- Flat face and sharply defined lower edge
- Wide 10-inch board with an integral 2-inch batten
- Cedar-mill and matte visual options
- Composite trim and accessories for a unified appearance
Gentek generally feels more like refined traditional siding. ASCEND leans toward the wider, flatter appearance associated with premium painted wood-style cladding. Both can look excellent; the architecture of the home should guide the decision.
Thickness Is Not an Apples-to-Apples Comparison
Gentek publishes nominal vinyl panel thickness, including .046 inch for Sequoia Select horizontal siding. Within rigid vinyl siding, thickness can help describe the panel’s construction, but it is only one part of the system. Lock geometry, nail-hem design, projection and proper installation also influence wall appearance and performance.
ASCEND combines a composite face with a graphite-infused polystyrene component. Its construction cannot be accurately ranked against Gentek by comparing a single thickness measurement. For ASCEND, published assembly properties such as projection, impact testing, thermal resistance, expansion and code evaluation are more useful.
Wind-Load Testing and Engineering
Both manufacturers reference ASTM D5206, a laboratory test method used to evaluate the resistance of siding products to negative wind pressure. ASTM D5206 is a test procedure—not one universal wind-speed rating for every house, profile or fastening schedule.
Published Manufacturer Information
- Gentek states that Sequoia Select has been tested for negative wind-load resistance using ASTM D5206 and meets or exceeds the applicable industry wind-load performance standard.
- ASCEND’s current 7-inch technical summary lists ASTM D5206-13 wind-load resistance of 53 psf with 24-inch-on-center fastening and 1¼-inch fastener penetration.
- ASCEND’s board-and-batten technical summary lists 52 psf with 12-inch-on-center fastening and 65.3 psf with 8-inch-on-center fastening, when installed over the specified sheathing assembly.
These statements should not be converted casually into a job-specific wind-speed promise. Building height, location, exposure category, wall zone, sheathing, fastener type, penetration and spacing all matter. High-wind projects should be checked against the current product report, local code and project-specific design requirements.
Fire and Thermal Performance
ASCEND publishes a broader set of assembly-specific fire and thermal data. Its current 7-inch technical summary reports an ASTM E84 Class A result, with a flame-spread index below 25 and smoke-developed index below 450. It also references rated assemblies evaluated under ASTM E119 and ASTM E2707-22, along with ASTM D635 and ASTM D1929 test results.
The same technical summary reports R-2.0 for the 7-inch plank. The board-and-batten summary reports R-1.6. These values can help reduce thermal bridging when the product is installed in the tested configuration, but they do not replace the insulation required by the applicable energy code.
Sequoia Select is conventional non-insulated vinyl siding and does not publish an equivalent standalone R-value. Its strength is a simpler, lighter exterior system that can be combined with a separately designed continuous-insulation strategy when the wall assembly requires one.
Moisture Resistance and Maintenance
Both systems avoid the recurring field painting normally associated with traditional wood siding. Neither relies on exposed wood fibers that must be continually sealed to prevent swelling or decay.
- Gentek: its color-through vinyl surface does not require routine painting and will not peel like a field-applied coating.
- ASCEND: the manufacturer describes its component materials as non-moisture-absorbing and resistant to rotting, warping, shrinking and swelling.
- Both: periodic gentle washing and reasonable separation from concentrated heat sources remain important.
The cladding itself is not the home’s complete water-management system. Proper flashing, a code-compliant water-resistive barrier and correct detailing around windows, doors and penetrations remain essential with either product.
Installation Considerations
Gentek and ASCEND are both designed as mechanically fastened, floating cladding systems. Their panels must be allowed to move as temperatures change, so neither product should be hard-nailed.
Gentek Installation Advantages
- Lightweight panels that are familiar to experienced vinyl crews
- Full-roll nail hem for secure wall attachment
- Advantage Lock connection between courses
- Common vinyl-siding tools and established installation practices
- Multiple profiles for matching existing neighborhood architecture
ASCEND Installation Advantages
- Lightweight construction compared with many solid claddings
- Self-aligning stack lock
- No routine field painting, joint caulking or finish touch-up
- Integral batten on the board-and-batten profile
- Published fastening and clearance instructions for each profile
ASCEND requires a smooth, sheathable surface and cannot be installed directly over open studs. Its guide calls for a water-resistive barrier, proper flashing and profile-specific clearances. Gentek vinyl siding must likewise be installed over a code-compliant wall assembly using the manufacturer’s instructions and recognized vinyl-siding practices.
With either system, workmanship is just as important as the panel itself. Correct layout, fastening, expansion clearance, flashing and accessory detailing protect both appearance and warranty coverage.
Warranty Comparison
Both products are supported by substantial limited warranties, but the details differ and deserve a careful reading.
Gentek Sequoia Select
- Lifetime limited coverage for a qualifying original homeowner
- Non-prorated during the original qualifying owner’s coverage
- Transferable with subsequent prorated terms
- Lifetime fade coverage exceeding four Hunter Delta E units
- Published hail protection provisions
ASCEND Composite Cladding
- Lifetime limited coverage for a qualifying original homeowner
- One transfer to the first subsequent qualifying resident owner
- Five-year labor provision for qualifying repairs or replacement
- Fade protection based on four Hunter Delta E units
- Specified protection for hail up to one inch in diameter
Warranty headlines are helpful, but exclusions, transfer rules, claim deadlines, labor limits and prorated schedules determine the practical coverage. Homeowners should keep the contract, proof of purchase, product identification and installation date with their property records.
Which Product Is the Better Fit?
Gentek Sequoia Select May Be the Better Fit When:
- The project needs a premium vinyl product at a practical overall cost.
- Traditional clapboard or Dutch-lap proportions suit the home.
- A broad selection of horizontal profiles is important.
- Color coordination across siding, soffit, fascia and rainware matters.
- The installer has extensive experience with vinyl siding systems.
- Simple repairability and familiar accessories are priorities.
ASCEND May Be the Better Fit When:
- A wide, flat painted-wood appearance is the main design goal.
- The homeowner prefers a 7-inch plank or 12-inch board-and-batten profile.
- Added exterior thermal resistance is valuable.
- Published Class A ASTM E84 performance is relevant to the project.
- A composite system is preferred over conventional vinyl siding.
- Efficient installation without field painting or joint caulking is attractive.
A Thoughtful Final Comparison
Gentek Sequoia Select and ASCEND Composite Cladding arrive at low-maintenance curb appeal in two different ways. Gentek offers a well-developed premium vinyl system with multiple profiles, coordinated accessories, strong warranty language and the practical advantages that make vinyl siding appealing to many homeowners.
ASCEND offers a more specialized composite alternative. Its tall plank, integral board-and-batten design, backed construction, thermal values and published fire-test results give it a distinct place in the premium cladding market.
For homeowners focused on value, profile flexibility and the proven simplicity of premium vinyl siding, Gentek deserves serious consideration. For homeowners seeking a flatter wood-inspired face with added composite and thermal characteristics, ASCEND is an equally thoughtful option.
The most successful choice will balance the home’s architecture, wall assembly, local code requirements, installation expertise, budget and preferred finished appearance.
Quad Cities Siding Guidance
Compare the Products in Person
Suburban Wholesale & Supply can help contractors and homeowners compare Gentek siding with premium exterior-cladding alternatives. Seeing actual colors, textures, profiles and trim options in natural light is one of the best ways to make a confident selection.
Local inventory does not change laboratory performance, but it can make an important difference in lead times, replacement-piece availability, scheduling and jobsite support.
Request Product InformationTechnical References
- Polymeric Exterior Products Association — VSI Product Certification Program . Explains independent certification and identifies the ASTM standards applicable to vinyl, insulated vinyl, polypropylene and backed vinyl siding.
- ASTM International — ASTM D3679, Standard Specification for Rigid PVC Siding .
- Gentek — Sequoia Select Ultra-Premium Vinyl Siding . Manufacturer profile, construction, dimensions, colors, ASTM D5206 statement and warranty overview.
- Gentek — Vinyl Siding Limited Warranty . Review the warranty supplied with the selected product because effective dates and terms may change.
- Alside — ASCEND Composite Cladding Product Information . Manufacturer description of composition, profiles, finishes, colors and installation characteristics.
- ASCEND — 7-Inch Composite Plank Technical Summary . Published physical data, ASTM fire-test references, R-value, termite resistance, wind-load test data and code reports.
- ASCEND — 12-Inch Composite Board-and-Batten Technical Summary .
- ICC Evaluation Service — ESR-4449 . Code-evaluation documentation for ASCEND Composite Cladding.
- ASCEND — Installation Guide . Manufacturer requirements for wall preparation, weather protection, fastening, expansion clearances and profile installation.
- ASCEND — Composite Cladding Limited Warranty . Effective for qualifying products manufactured on or after the date stated in the document.
Contractor Notes
We‘re here to help.
Suburban Wholesale & Supply works with contractors, remodelers, builders, and property professionals across Davenport, Bettendorf, Moline, Rock Island, and the wider Quad Cities. If Gentek Vinyl Siding vs. ASCEND Composite Cladding: Comparison affects a project you are pricing, our team can help compare product lines, confirm available options, and prepare a quote that fits the opening, exterior, or jobsite requirements.
Our counter and showroom teams support window, patio door, entry door, storm door, siding, trim coil, gutter protection, and accessory orders every week. We can talk through manufacturer differences, color and finish selections, installation details, lead times, and documentation so you can give your customer clear answers before the work begins.
For current availability, contractor pricing, product literature, or help matching this topic to a real project, contact Suburban Wholesale & Supply or send the details through our quote form. We will help you move from product research to an accurate material order with fewer surprises.
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