Red Flashing – 10 ft Roll
The flashing roll used to seal where heat pump lines pass through the exterior wall.
AirGreen codeAG-SP-013
514 316-2973 · sales@airgreen.ca
Quick facts
The red flashing in a 10 ft roll is used to seal the opening drilled through the exterior wall for a heat pump's refrigerant lines, condensate drain and cable. It helps keep rainwater and cold air out of the wall.
The wall penetration, a point not to overlook
Every wall-mounted heat pump needs a hole a few inches wide in the exterior wall. Poorly sealed, this penetration lets in the water that runs down the façade. It seeps behind the siding, wets the insulation and the structure, and the damage often shows up only years later. Flashing carefully installed around the opening prevents that scenario.
Good sealing practices
- Drill the penetration with a slight slope to the outside.
- Install the flashing overlapping, like shingles: the upper piece covers the lower one, so water runs away from the wall.
- Finish around the lines with a sealant suited for exterior use.
- Follow the instructions printed on the roll or its packaging.
One roll for several installations
The 10 ft roll usually covers several wall-mounted heat pump penetrations, depending on the size of the opening and the type of wall. It is also used to reseal an old penetration when a unit is replaced.
Supplied and installed by AirGreen in Greater Montréal
Our refrigeration technicians seal the wall penetration on every heat pump installation in Montréal, Laval, Longueuil, on the South Shore and the North Shore. RBQ licence 5645-9605-01. For availability or a quote, call us at 514 316-2973 or email sales@airgreen.ca with the number of rolls.
Keeping water out of the wall
Every wall-mount heat pump needs a hole through the exterior wall: it has to be made weathertight.
- Refrigerant lines, drain and cable passing through the exterior wall
- Work around an opening in the air barrier or the siding
- Resealing an old wall penetration
- Wall-mount and multi-zone heat pump installations
Specifications
From the manufacturer’s documentation. A value the manufacturer does not publish is not listed.
What to know before installing
- Follow the instructions printed on the roll or its packaging.
- Lap the flashing like shingles: the upper piece covers the lower one.
- The wall penetration should slope slightly toward the outside.
- Finish the seal around the lines with a sealant suited to outdoor use.
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Rubber Anti-Vibration Pads – Box of 48
Plastic End Caps for Wall Bracket – Box of 50
Protective Roof Extension for Two-Fan Units
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Frequently asked questions
What is flashing for on a heat pump installation?
To seal the opening drilled through the exterior wall for the refrigerant lines, the drain and the cable, so rainwater does not get into the wall.
How many penetrations does a roll cover?
It depends on the size of the opening and the wall. A 10 ft roll usually covers several wall-mount heat pump penetrations.
Is flashing enough on its own?
No. It goes with a penetration drilled with a slight slope toward the outside and a sealant around the lines.
Can you install it?
Yes. Our technicians seal the wall penetration on every heat pump installation, everywhere in Greater Montréal.
A weathertight wall penetration from the first rain
Tell us the size and the quantity: we confirm availability and send you a quote. Or let our technicians install it for you.
Specifications from the manufacturer’s documentation, checked on October 7, 2026.