In short
Duct insulation keeps heated or cooled air at the right temperature all the way to the room, stops cold ducts from sweating and quiets the system. DMAX insulates supply, return, exhaust and heat-recovery ductwork, indoors and on roofs, with vapour barrier and aluminium jacketing, on Montreal’s South Shore, in Montérégie and in Montreal.
Specifications
- Systems
- Supply, return, exhaust, heat recovery
- Outdoor
- Aluminium jacketing, flashings, mechanical fastening
- Indoor
- Vapour-barrier wrap, rigid board, acoustic lining
- Access
- Work at height, rooftops, lifts and scaffolding as needed
An uninsulated duct loses its temperature between the unit and the room, sweats when it crosses a warmer space, and carries fan noise through the building. On a roof, an unprotected duct takes rain, frost and thermal swings until the insulation soaks through.
We insulate ventilation systems indoors and out, with the finish that matches the duct’s real exposure.
What we work on
- Indoor supply and return ductwork
- Outdoor ducts and rooftop sections
- Connections to rooftop and air-handling units
- Plenums, elbows, transitions and dampers
- Exhaust and heat-recovery systems
- Repair and replacement of damaged insulation
Finishes
- Duct wrap with reinforced vapour barrier
- Rigid board for high-exposure ductwork
- Taped and mastic-sealed seams, continuous vapour barrier
- Aluminium jacketing for outdoor and rooftop runs
- Bands and flashings at penetrations and terminations
- Acoustic lining on noisy sections
The detail that matters
Outdoors is unforgiving
On a roof, everything rides on the finish being watertight. One badly flashed seam lets water in, the insulation loads up, performance drops to nothing and corrosion starts under the jacket — with nothing visible from outside for years.
We treat outdoor sections like roofing: laps running the right way, flashings at terminations, compatible sealant, mechanical fastening where wind calls for it.
FAQ
Your duct insulation questions
We work in Saint-Isidore, Saint-Rémi, Châteauguay, Mercier, Saint-Constant, Delson, Candiac, La Prairie, Brossard, Longueuil, Saint-Jean-sur-Richelieu, Beauharnois, Salaberry-de-Valleyfield, Montreal, Laval, Terrebonne, Boisbriand, Saint-Eustache and Oka. See the service area
Why insulate a ventilation duct?
An uninsulated duct loses temperature between the unit and the room, sweats when it runs through a space warmer or colder than the air inside it, and carries fan noise through the building. Insulation fixes all three.
My air-conditioning duct is dripping. What should I do?
That is condensation: the duct surface is colder than the dew point of the surrounding air. It needs insulation with a continuous vapour barrier, joints sealed with tape and mastic, and extra care at hangers and connections, where water shows up first.
Do you insulate outdoor and rooftop ducts?
Yes. On a roof, we treat the finish like roofing: aluminium jacketing, laps in the right direction, flashing at the ends, compatible sealant and mechanical fasteners wherever wind calls for them.
Do you insulate heat-recovery ducts?
Yes. Exhaust and heat-recovery ductwork is part of what we insulate, along with connections to rooftop units and air handlers.
Can you redo the insulation on an existing duct?
Yes. Replacing damaged, wet or sagging insulation is routine work for us: we strip what no longer performs and rebuild a continuous vapour barrier.
Services
Our other specialties
One site often calls for more than one stage. We cover them all.
Pipe insulation
Domestic hot and cold water, heating, refrigeration, sprinklers, tanks and boilers.
Learn more→Building insulation
Blown cellulose, spray urethane, polyurea, batt insulation, vapour barriers, attics and crawl spaces.
Learn more→Soundproofing and acoustic insulation
Partitions, ceilings, mechanical rooms, ductwork: cutting the noise that travels through a building.
Learn more→