Benjamin Moore’s Celect Canvas mounting blocks offer >210 mph wind resistance with cellular composite construction that doubles the R-value of standard vinyl, providing contractors with a premium solution for exterior fixture mounting that stands up to Montana’s extreme weather.
These aren’t standard mounting blocks. The cellular composite material delivers approximately double the thermal resistance of standard vinyl or wood — a genuine performance advantage when every bit of insulation matters in Montana’s temperature extremes. The combination of high-impact resistance with rot-proof, warp-proof, and buckle-resistant properties means these blocks won’t fail after a few freeze-thaw cycles like cheaper alternatives.
Wind Performance and Installation Versatility
The >210 mph wind resistance puts these blocks in a different league than typical vinyl mounting solutions. Montana contractors working along the Rocky Mountain Front or in exposed valley locations understand that chinook winds and winter storms demand hardware that won’t pull loose or crack under pressure.
The product line covers every exterior mounting need:
| Product Type | Dimensions | Application |
|---|---|---|
| Vent/Light Mount | 9” x 9” | Dryer and exhaust vents |
| Recessed Mount | 9” x 9” | Recessed fixtures |
| Electrical Mount | 8-1/4” x 7-3/4” | Outlets and GFCIs |
| Universal Mount | 8-1/4” x 7-3/4” | General purpose |
| Split Mount | 8-1/4” x 7-3/4” | Split configurations |
| Gang Block | 28” x 8-1/4” | Multiple fixtures |
Installation follows a logical sequence: install the base ring before the siding, or cut out a 2” wider and 3/4” higher opening if siding is already present, then secure the face plate over the siding. Cortex trim screws and plugs provide the hidden-fastener look that separates professional work from amateur hour.
Critical detail: maintain 1/4” to 1/2” expansion gaps depending on temperature to allow for thermal movement. Skip this step and the blocks will buckle when summer heat hits — a rookie mistake that these blocks are engineered to forgive better than most, but proper installation still matters.
Paint Requirements and Compatibility
Here’s where contractors need to pay attention. These blocks require vinyl-safe exterior paint with a recommended Light Reflectance Value (LRV) ≥ 50, with some sources specifying ≥ 57. Colors with LRV ≤ 56 require custom vinyl-safe formulation.
Using non-vinyl-safe paint or standard paint in dark colors (LRV < 50) may void the product warranty. That’s not manufacturer fear-mongering — dark colors on cellular PVC absorb heat and can cause warping or failure without proper paint chemistry.
The blocks integrate seamlessly with various siding profiles: 7” Horizontal Lap, 7” Shake, 5” Smooth Clapboard, and Board & Batten. They’re designed as part of a complete system, not an afterthought.
Certifications and Performance Standards
These blocks carry VSI (Vinyl Siding Institute) Certification and meet or exceed major building code requirements (ICC-ES), along with ASTM D3679 / D7793 standards for siding/trim items. The wind load testing validates the >210 mph resistance claim — not marketing fluff but tested performance.
The warranty structure includes a Limited Lifetime Warranty on the cellular composite substrate and 25-year color protection for pre-finished options. All warranty coverage depends on proper installation and use of approved vinyl-safe coatings.
The bottom line: these mounting blocks solve real problems. The thermal performance advantage, wind resistance, and rot-proof construction justify the premium over basic vinyl blocks. For Montana contractors dealing with temperature swings, high winds, and demanding freeze-thaw cycles, Celect Canvas blocks deliver measurable durability improvements. Just remember the paint requirements — that LRV restriction isn’t optional.
Frequently Asked Questions
What makes these mounting blocks worth the premium over standard vinyl?
The >210 mph wind resistance and approximately double the R-value of standard vinyl or wood provide genuine performance advantages. Add the rot-proof, warp-proof, and buckle-resistant properties, and you’re looking at blocks that won’t need replacement after a few harsh winters.
Can any exterior paint be used on these blocks?
No. Vinyl-safe exterior paint with an LRV ≥ 50 (some sources specify ≥ 57) is required. Colors with LRV ≤ 56 need custom vinyl-safe formulation. Using non-vinyl-safe paint or dark colors (LRV < 50) may void the warranty.
How critical are the expansion gaps during installation?
Maintaining 1/4” to 1/2” expansion gaps (depending on temperature) is critical for allowing thermal movement. Cellular composite expands and contracts with temperature changes. Skip the gaps and expect buckling or cracking.
Which siding profiles work with these mounting blocks?
The blocks are compatible with 7” Horizontal Lap, 7” Shake, 5” Smooth Clapboard, and Board & Batten profiles, plus the full Celect Trim and Moulding system.
What’s included with each mounting block?
Each unit includes the mount base ring and mount face plate. Cortex screws/plugs are sold separately but commonly bundled. Units come individually or in bags of 1.
Ready to Get Started?
Our siding specialists can help you find the right Benjamin Moore products for your project.
More from Benjamin Moore
Explore All Benjamin Moore Products
We carry Benjamin Moore across all 11 Montana and Idaho stores.
