Stop rust. Seal leaks. Add 10 to 15 years to your metal roof for a fraction of replacement cost. Specialists in metal barn, agricultural, and commercial roof coating since 1975.
A new metal roof on an Ontario barn or commercial building costs anywhere from $7 to $16 per square foot installed. Coating an existing metal roof costs a fraction of that — and a properly applied coating system extends the life of the roof by 10 to 15 years.
For most Ontario barn and commercial roof owners, the math is simple. If your metal roof has rust spots but the panels are structurally intact, restoration and coating saves you tens of thousands of dollars compared to tearing it off and starting over. The catch: coating only works if it’s done properly, with proper preparation, on a roof that’s actually a candidate for restoration.
That’s where we come in. North Pro Barn Painting has been restoring and coating metal roofs across Southern Ontario since 1975. We assess honestly — if your roof needs to be replaced, we’ll tell you. If it can be saved, we’ll save it, and we’ll make it last.
Knowing when to act on a metal roof is the difference between a $5,000 coating job and a $40,000 replacement.
Small rust patches around fasteners, seams, and edges. These are normal as a metal roof ages but they spread fast. Treating rust early stops it from eating through the panel.
When the original factory finish has gone dull, blotchy, or powdery to the touch, UV damage has compromised the protective layer. Recoating restores both appearance and protection.
Thermal expansion over decades works fasteners loose. A roof full of loose screws leaks, lifts in wind, and accelerates corrosion around the fastener heads.
Original sealant breaks down within 15 to 20 years. Once seams open up, water infiltration starts. Restoration includes sealing every seam.
Small punctures from hail, branches, or wear can be patched and sealed as part of a coating job — far cheaper than panel replacement.
A faded or dark metal roof radiates significant heat into the building. A reflective elastomeric coating can drop attic and upper-floor temperatures meaningfully and reduce cooling load.
If your roof shows any of these signs, it’s time for an honest inspection.
We provide them free.
We work with several coating systems depending on the roof condition, substrate, and what you need from the finished result.
The workhorse for most metal roof restoration projects in Ontario. Elastomeric coatings flex with thermal expansion, seal hairline cracks, and provide excellent waterproofing. Reflective white versions reduce summer heat gain significantly.
For metal roofs that need maximum durability and chemical resistance — typically agricultural processing facilities and industrial operations.
For roofs with significant existing rust. Applied as a base layer before topcoat to stop active corrosion and prevent it from telegraphing through the finish.
White or light-coloured elastomeric systems that reflect 60% to 90% of sunlight. Meaningful summer cooling and reduced building load.
We use Korzite, Sherwin-Williams, Cloverdale, and Benjamin Moore industrial coating systems. Specific product selection is part of your written estimate.
Metal roof coating only lasts if it’s done right. Cutting corners on prep is the single most common reason coating jobs fail. Here’s how we do it properly.
We walk the roof, document rust mapping, identify failed seams and fasteners, and assess overall panel condition. You receive a written report with photos and an honest recommendation: coat, partial repair, or replace.
Every square foot of the roof gets pressure washed to remove dirt, oxidation, loose paint, and biological growth. Coating won't bond to a dirty roof, period.
Active rust spots get mechanical removal followed by a rust-converter or rust-inhibiting primer. We treat the rust at its source rather than just covering it up.
Backed-out screws get replaced with weather-rated, oversized fasteners that bite into fresh material. Loose hardware gets tightened or rebuilt.
Every seam, ridge cap, and flashing detail gets resealed with a roof-grade elastomeric sealant. This is where most metal roof leaks start.
Where the substrate requires it, we apply a bonding primer compatible with the topcoat system. Skipping this step on bare or oxidized metal is the most common reason coatings peel within a year.
Sprayed application of an elastomeric or polyurethane topcoat in your chosen colour. Two coats, applied to specification, with proper film thickness.
You receive photo documentation of completed work and a written warranty.
Pricing depends on roof size, condition, access, and the coating system specified. As a general guide for typical Ontario barn and commercial metal roofs:
A typical 2,500 sq ft barn metal roof falls in the $5,000 to $12,000 range for full restoration and coating. By comparison, replacing that same roof would run $20,000 to $40,000+. The math favours restoration in almost every case where the panels are structurally sound.
Every project gets a written, line-item quote. No vague allowances.
A properly prepped and coated metal roof typically lasts 10 to 15 years before recoating is needed. Shorter on roofs with heavy chemical exposure or extreme weather; longer on roofs that get periodic maintenance.
Yes — that's most of what we do. The key is proper rust treatment before coating, not just painting over it. Untreated rust will telegraph through any coating within a year or two.
Coating combined with proper seam sealing and fastener replacement stops most leaks. Significant punctures or panel failures may require panel repair before coating.
For agricultural buildings with livestock or high-occupancy commercial buildings, yes — the summer cooling benefit can be significant. For storage buildings or seldom-occupied structures, the colour decision is mostly aesthetic.
Usually no. Damaged panels can be replaced individually or repaired before coating. We assess this as part of every estimate.
Late May through early October is the working season. Coatings need surface temperatures above 10°C and dry conditions to cure properly. We book the season early — winter is the best time to schedule spring and summer work.
Typically 60% to 75% versus full replacement, while gaining 10 to 15 years of additional roof life. The economics favour restoration in almost every case where the structure is sound.