Muskoka Thermal Coatings
DC315 Thermal Barrier Specialists · Muskoka, Ontario
The Inspection Problem That Surprises Contractors
Every week, we get calls from builders and homeowners in Muskoka whose projects have been stopped — or whose sales have been delayed — because of one thing: exposed spray foam insulation without a thermal barrier.
It's one of the most common code compliance issues in residential construction today, and it's entirely preventable.
The Core Requirement: Thermal Barrier Over Spray Foam
Under the Ontario Building Code, spray polyurethane foam insulation in an occupied or accessible space must be separated from the interior by a thermal barrier. This applies to:
- Basements (finished and unfinished)
- Crawlspaces accessible to occupants
- Garages attached to living space
- Attic knee walls and sloped ceilings
- Rim joists in accessible basement areas
What Are the Approved Thermal Barrier Options?
1. 12.7mm Gypsum Drywall — the standard solution for finished spaces.
2. DC315 Intumescent Coating — a spray-applied coating certified under ICC-ES AC377, widely accepted by Ontario building officials as a legitimate alternative where drywall is impractical.
What Inspectors Actually Check
Coverage
Is all exposed foam coated or covered? Partial applications, missed sections behind pipes, or uncoated rim joists will result in a failed inspection.
Thickness
For DC315, dry film thickness must meet the product's tested performance specification. An experienced applicator confirms coverage before leaving the site.
Product Compatibility
DC315 is tested for use over specific foam formulations. The applicator must confirm compatibility.
Documentation
Inspectors may ask for product data sheets or ICC-ES reports. A qualified applicator can provide documentation support.
Common Reasons Projects Fail Inspection
- Partial application — foam coated on walls but not rim joists
- DIY attempts with non-compliant coatings
- Wrong product — unrated intumescent coating that doesn't meet AC377
- Insufficient thickness due to inexperience
- No documentation to back up the application
Pro Tip for Builders: Schedule DC315 application after spray foam is complete but before any other trades move back in. This makes inspection straightforward and eliminates correction orders.
Local Insight
Muskoka District and its municipalities all operate under the Ontario Building Code. Inspector familiarity with DC315 varies, but the product has broad acceptance backed by ICC-ES certification and extensive test data. We've successfully supported projects across the region that pass on first inspection.
If you need DC315 applied to pass inspection in Muskoka, contact us today. We work directly with builders, contractors, and inspectors to ensure projects move forward without delays.