Ductwork Insulation Toronto

Professional Ductwork Insulation in the GTA

Last updated: March 6, 2026

Konstruction Group provides professional duct insulation services for new construction and retrofit projects in Toronto. When HVAC ductwork runs through unconditioned spaces like attics and basements, proper insulation prevents energy loss and condensation problems. We install duct wrap insulation as part of our complete insulation services for custom homes and multiplexes, coordinating with framing and drywall for seamless project completion.

Why Insulate Ductwork

Uninsulated ducts running through unconditioned spaces can lose 25-40% of heating and cooling energy before the air reaches its destination. In Toronto's climate, where heating systems run for six months or more, that energy loss translates directly into higher utility bills. Duct insulation keeps conditioned air at temperature as it travels through attics, basements, garages, and other unconditioned areas. It also prevents condensation on cold supply ducts in humid summer conditions, which can lead to water damage, stained ceiling tiles, and mould growth inside wall cavities. Proper duct wrapping completes the thermal envelope alongside wall and ceiling insulation.

Duct Insulation Services

• Duct Wrap Insulation – Fiberglass duct wrap with vapor barrier for exposed HVAC ductwork
• Supply & Return Ducts – Insulation for both supply and return air ductwork
• Attic Ductwork – Critical insulation for ducts running through unconditioned attic space
• Basement Ductwork – Insulation for ducts in unfinished or semi-conditioned basements

OBC Requirements

Ontario Building Code requires duct insulation when ductwork runs through unconditioned spaces. The required R-value depends on the application - typically R-8 for ducts in semi-conditioned spaces and R-12 for ducts in fully unconditioned attics or garages. Supply ducts carrying heated or cooled air require insulation in all unconditioned zones to prevent thermal loss and condensation. We install fiberglass duct wrap with a factory-applied foil-scrim-kraft (FSK) vapour barrier facing outward, sealed at all seams with pressure-sensitive tape or mastic to meet code requirements for your project.

What We Provide vs. What You Need

• We Provide – Duct wrap insulation, vapor barrier, proper sealing at joints and penetrations
• You Provide – Completed HVAC installation, access to ductwork

Why Choose Konstruction Group

• Complete Coverage – All exposed ductwork properly insulated
• Code Compliant – Installation meets OBC requirements
• $10M Liability Insurance – Full coverage for mechanical insulation on HVAC ductwork
• WSIB Compliant – Workers insured for overhead duct wrapping and mechanical room work
• Coordination – We work with your HVAC contractor's schedule

Duct Wrap Insulation

Duct wrap is fiberglass insulation with a foil or vinyl facing that wraps around sheet metal ductwork. It prevents condensation on cold air supply ducts and reduces heat loss from warm air ducts running through unconditioned spaces like attics, garages, and crawl spaces. We wrap rectangular and round ducts to the R-value specified by Ontario Building Code — typically R-8 for ducts in unconditioned spaces. Proper duct wrap installation includes sealed seams and tight-fitting joints to maintain the vapor barrier.

Flexible Duct Insulation

Flexible ducts come pre-insulated with a fiberglass layer between the inner liner and outer jacket. When installing new flex duct runs, we ensure the insulation is not compressed at bends or connections — compressed insulation loses R-value and restricts airflow. For existing flex ducts with damaged or insufficient insulation, we can re-wrap or replace sections to restore thermal performance.