Correct Rooftop Penetration

Correct Rooftop Penetration

Refrigerant lines for rooftop condensing units must penetrate the roof at some point.  There are proper ways to create this penetration, and others are not-so-appropriate.  A proper penetration sheds storm water, but also allows for removal and replacement of the line-set without disturbing the roof surface.  A “goose-neck” opening, pictured here, accomplishes this purpose.  A line-set penetration that relies on spray foam, or tar, or any other liquid-applied filler or waterproofing material will eventually leak causing damage to the building interior and to HVAC equipment.

Incorrect Rooftop Penetration

Incorrect Rooftop Penetration

Also, an HVAC service technician when faced with a line-set that is firmly set in liquid-applied sealant may not be equipped to adequately ‘re-seal’ the penetration after replacing the line-set; or he likely may be discouraged from replacing the line-set altogether as it can be difficult to remove an old refrigerant line after it has been cemented in place for years.

Rob Milam
Project Manager
zumBrunnen, Inc.

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