Benjamin Moore Celect Mounts & Blocks

Celect Mounts & Blocks are purpose-built cellular composite mounting accessories manufactured by Westlake Royal Building Products, designed exclusively for Celect Cellular Composite Siding systems. These cellular PVC blocks feature Kynar Aquatec factory-applied coating with a 25-year fade resistance warranty — critical protection against Montana’s intense UV exposure at elevation.

The product line includes six specialized configurations ranging from compact 8-1/4” x 7-3/4” electrical mounts to expansive 28” x 8-1/4” gang blocks for multiple penetrations. Unlike standard vinyl accessories that lack proper expansion pocket depth, these blocks incorporate gravity-lock technology specifically engineered to prevent the buckling and moisture infiltration that plague standard mounting solutions.

Technical Specifications and Mount Types

The Celect mounting system offers six distinct configurations to handle every penetration type contractors encounter:

Mount Type	Dimensions	Application
Vent/Light Mount	9” x 9”	Exterior lighting fixtures, standard vents
Recessed Mount	9” x 9”	Flush-mounted fixtures and vents
Electrical Mount	8-1/4” x 7-3/4”	Outdoor outlets and switches
Universal Mount	8-1/4” x 7-3/4”	General-purpose penetrations
Split Mount	8-1/4” x 7-3/4”	Split installations and repairs
Gang Block	28” x 8-1/4”	Multiple penetrations in single location

The gravity-lock system requires precise installation tolerances: 2-inch side pocket depth and 3/4-inch top/bottom clearance for standard expansion. When retrofitting, contractors must cut openings 2 inches wider and 3/4 inch taller than the mount base. These specifications aren’t suggestions — they’re requirements for the interlocking system to function properly through Montana’s extreme temperature swings.

The blocks work with Cortex and Pro-Plug concealed fastening systems. Installation follows a straightforward sequence: secure the face plate using two Cortex trim screws with color-matched plugs. Touch-up paint bottles are available for field finishing if necessary.

Kynar Coating and Long-Term Performance

The Kynar Aquatec factory-applied coating carries a 25-year fade resistance warranty — not marketing fluff but genuine protection against UV degradation at Montana elevations. Compared to fiber cement accessories with traditional paint finishes, the Kynar coating delivers superior fade resistance while the cellular composite substrate weighs less and installs easier.

The cellular composite substrate itself carries a Limited Lifetime Warranty (transferable). Maintenance consists of occasional cleaning with mild soap — no periodic repainting needed unless using the Canvas line. Unlike wood mounting blocks that rot, peel, and attract insects, the cellular PVC maintains its structural integrity while preserving a real-wood aesthetic.

The blocks feature natural wood-like texture achieved through the cellular PVC manufacturing process. They’re also recyclable at end of life — though with proper installation, that endpoint sits decades in the future.

Professional Installation Considerations

These blocks are designed exclusively for Celect Cellular Composite Siding — they won’t integrate properly with other siding systems. For the unpainted Canvas line, Benjamin Moore paint with Light Reflectance Value (LRV) above 50 is specifically recommended.

Each mount ships individually bagged. The standard package includes one mount per bag, with Cortex screw and plug kits sold separately or included in larger accessory cartons. Optional items include Kynar touch-up paint bottles or markers for field repairs.

Contractors favor the seamless interlocking design and exact color match, with the Cortex fastening system noted for providing a high-end, fastener-free finish. Homeowners rate them highly for aesthetic appeal and long-term durability — specifically the elimination of rot concerns and repainting requirements.

For Montana installations, the gang blocks prove particularly useful on rural buildings where multiple utility penetrations cluster together. The 28-inch width handles grouped electrical meters, disconnect switches, and service entrances without creating a patchwork of individual mounts.

FAQ

What makes these different from standard vinyl mounting blocks? Standard vinyl accessories lack the expansion pocket depth required for Celect cellular siding, potentially leading to buckling. Celect blocks incorporate gravity-lock technology to prevent gaps and moisture entry, specifically engineered for the expansion characteristics of cellular composite siding.

Can these blocks be painted? The Canvas line variants can be painted using Benjamin Moore paint with LRV above 50. Pre-colored blocks feature Kynar Aquatec coating that shouldn’t need repainting during their service life.

What’s included with each mount? One mount per bag. Cortex screw and plug kits are sold separately or included in larger accessory cartons. Touch-up paint bottles or markers are optional additions.

How critical are the expansion clearances? The 2-inch side pockets and 3/4-inch top/bottom clearances are requirements, not suggestions. The gravity-lock technology depends on these dimensions to prevent moisture infiltration.