Assessing a roof leak.
How to find roof leak with multiple shingle layers.
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.
Use the flashlight to check for any water trails or.
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.
However there are some guidelines.
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.
Often there is a problem with the first layer of shingles that was not apparent.
Exposed to water as it rains.
For example soak the downhill side of a chimney first then each side then the top on both sides.
If a leak is difficult to find enlist a helper and go up on the roof with a garden hose.
Start low soaking the area just above where the leak appears in the house.
When you re just layering over the old roof you won t get the same opportunity to fully inspect the roof s sheathing.
Multiple layers of shingles happen because folks want to avoid extra removal work or to save the cost of removal labor and disposal costs.
That limit pertains to roofs with up to a 4 12 pitch.
How many layers of shingles are allowed on a roof.
When it s time to replace your roof there are several factors that might lead your roofing professional to.
Water will find its way into this gap and leak under your shingles.
That doesn t mean that you will immediately see water pouring through the ceiling into your living room.
A second layer of shingles only complicates the job when a roofer is trying to fix a 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.
Follow damaged insulation back to the source of the roof leak.
Because below the shingles and above the roof sheathing lies a layer of felt paper.
Most building codes allow up to two layers of organic or fiberglass asphalt shingles.
Benefits of adding multiple shingle layers.
Cons to overlaying a shingle roof can t detect leaks or other damage.
Climb inside the attic in the area where the roof is leaking.
Check for any signs of light coming through the plywood to find any obvious holes.
The underside of your roof may be obscured by insulation and that s actually helpful for finding the roof leak.
Roofs with multiple shingle layers may be damaged by smaller hail stones due to a softer support surface directly under the top shingle layer.
