Steel Window &
Kalamein Door Restoration

Preserving the architectural character of Canada’s most significant landmarks through precision metal-clad restoration and technical performance upgrades.

RTM specializes in the meticulous conservation and replication of heritage steel, bronze, and aluminum window systems. Our team combines historical accuracy with modern waterproofing and thermal science to protect building envelopes.

We offer comprehensive restoration for Kalamein doors—wood-core doors clad in sheet metal—ensuring structural stability, fire-rating integrity, and the preservation of original hardware and profiles.

As a specialized prime contractor, we coordinate every stage of the process, from in-house shop drawings and custom metal fabrication to final installation, delivering high-performance results for institutional and municipal projects.

Specialized Capabilities

Window & Door Expertise.

We blend traditional metalworking techniques with modern building science to restore architectural integrity, improve thermal performance, and meet the stringent requirements of historical preservation boards.

Steel Window Restoration

Meticulous removal of corrosion, failing putty, and hazardous coatings. We repair and realign warped frames, replicating true-divided light profiles to preserve the original architectural sightlines.

Kalamein Doors

Expert restoration of traditional wood-core, metal-clad doors. We repair compromised timber substrates and custom-brake new sheet metal cladding to restore fire-ratings and structural stability.

Thermal Performance

Upgrading heritage openings to meet modern energy standards. We carefully route existing frames to integrate slim-profile insulated glass units (IGUs) and concealed perimeter weatherstripping.

Hardware Conservation

Preservation of original operability. We carefully extract, strip, and re-patina antique bronze and brass cranks, friction stays, hinges, and cremone bolts, casting bespoke replicas when originals are beyond repair.

In-House Fabrication

When deterioration is total, our specialty metals shop fabricates exact replicas. Utilizing custom dies and extrusions, we recreate complex historical profiles in steel, bronze, and aluminum.

Finishing & Glazing

Application of high-performance architectural coatings and traditional linseed oil putties. We source historic restoration glass to maintain the authentic, wavy aesthetic of early century windows.