Masonite International

• ▸Founded: 1925, Laurel, Ontario, Canada
• ▸Current HQ: Tampa, Florida, USA
• ▸Canadian legacy: Founded in Ontario; major Canadian manufacturing presence remains
• ▸Market position: Mid-range to premium - largest North American door manufacturer by volume
• ▸Primary materials: Fibreglass, composite, solid timber, steel door slabs
• ▸Climate context: Pan-Canadian - products in every Canadian climate zone
• ▸Distribution: Builders, home improvement retail, specialty distributors across Canada
• ▸Website: masonite.com

• ▸Fibreglass Entry Doors
• ▸Composite Interior Doors
• ▸Steel Exterior Doors
• ▸Timber Doors
• ▸Glazed Door Panels

Masonite's fibreglass door slabs use a glass-fibre-reinforced composite construction that is more resistant to dimensional change than timber in Canada's wide temperature swings. However, fibreglass door slabs are not immune to finish degradation - the surface gel coat or factory finish is the primary maintenance point. Wood-grain textured fibreglass doors have a surface texture applied during manufacture. This texture looks like timber grain but is not - it is a pattern pressed into the fibreglass surface. Cleaning this surface requires a soft approach. Abrasive tools remove the texture. Steel door slabs at the panel face are painted over a primer coat. The paint is the weather barrier. Any breach in the paint - from impact damage, abrasion, or aggressive cleaning - allows moisture to reach the steel beneath, which will rust in Canadian climates. Glazed panels in Masonite doors use standard insulated glass units. The glass-to-frame seal around the panel is the same silicone-sealed rebate joint used in window systems - it ages, and it fails. In Canada's freeze-thaw cycling, it ages faster than in mild climates.

This is how I clean Masonite International windows. The tools and technique below come from 25 years of daily professional work on the glass. Every step has been tested on real installations and adapted specifically for Masonite International systems.

• ✕Do not use abrasive pads or scouring compounds on fibreglass door slabs - wood-grain texture is a surface feature, not structural
• ✕Do not use solvent-based cleaners on fibreglass or composite slabs
• ✕Do not leave any bare steel exposed on steel door slabs - flag any paint breach immediately
• ✕Do not pressure-wash door frame perimeters
• ✕Do not use water on timber door slab surfaces - wipe only with a lightly damp cloth and dry immediately

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