However there are some guidelines.
How to find roof leak with multiple shingle layers.
Adding a second layer could compromise the structure of your roof.
Check for any signs of light coming through the plywood to find any obvious holes.
That limit pertains to roofs with up to a 4 12 pitch.
Use the flashlight to check for any water trails or.
The best life will come from removing all the old layers down to roof boards or sheathing and then laying down the new roof on a well repaired flat surface.
Exposed to water as it rains.
Roofs with multiple shingle layers may be damaged by smaller hail stones due to a softer support surface directly under the top shingle layer.
Benefits of adding multiple shingle layers.
If a leak is difficult to find enlist a helper and go up on the roof with a garden hose.
Isolate areas when you run the hose.
Follow damaged insulation back to the source of the roof leak.
Start low soaking the area just above where the leak appears in the house.
Assessing a roof leak.
There may be leaks bad flashing damaged or rotted wood algae growth etc and you can t fix or prevent what you can t see.
That doesn t mean that you will immediately see water pouring through the ceiling into your living room.
Some overhead leaks are due to minor problems such as a single torn shingle or a small hole in flashing that you can usually handle with a little diy experience and some.
Many roof decks were designed to handle only one layer of shingles.
Multiple layers of shingles happen because folks want to avoid extra removal work or to save the cost of removal labor and disposal costs.
Often there is a problem with the first layer of shingles that was not apparent.
Water will find its way into this gap and leak under your shingles.
How many layers of shingles are allowed on a roof.
A second layer of shingles only complicates the job when a roofer is trying to fix a leak.
When you re just layering over the old roof you won t get the same opportunity to fully inspect the roof s sheathing.
For example soak the downhill side of a chimney first then each side then the top on both sides.
If your roof contains one layer of common asphalt shingles it usually takes a 1 or above diameter hail stone to cause damage roof hail damage.
When it s time to replace your roof there are several factors that might lead your roofing professional to.
Climb inside the attic in the area where the roof is leaking.
Because below the shingles and above the roof sheathing lies a layer of felt paper.