Does Your Roof Have Black Goop?
By: House Detective Home Inspections and Appraisals
Many times overlooked, contractors will place a second layer of shingles over the first incorrectly, causing penetration problems .
Roof tar, also known as black goop is commonly used by a non-professional to repair roofs. Roof tar does not last long, as it deteriorates quickly by the sun's UV rays, and it cracks and leaks.
Why do contractors use black goop (roof tar)?
Contractors use black goop to place a second layer of shingles over the first layer or as a quick fix for an existing leak. Basically to avoid the work involved in doing the job correctly. Contractors will just seal previous cracks or gaps on the old roofing material with roof tar.
Black goop (roof tar) concerns
When black goop/ roof tar is used improperly it can cause leaking and rotting of the roof from inside the attic.
Can black goop (roof tar) ever be used correctly?
The answer is yes! Black goop/ roof tar is a good product when used correctly. Professional contractors will use it, but properly. It is best used under things, such as the edges of a ridge vent, an attic fan, or other flashed locations on a roof. Black goop should be hidden from the sun. If completed correctly, it will last a long time and is an excellent sealer.
A second layer of shingles is not necessarily bad. It is often done by professional contractors. However it must be done properly or the homeowner may have problems in the future.
