When a homes foundation shifts is not level or damaged then the foundation issues may be reflected by a sagging bowed or wavy roof.
Is a wavy roof bad.
Wavy or sagging roofs can be a warning sign that there are foundation problems with a house however there are a number of other reasons for a roof to sag or be wavy as well.
If your roof shingles are not lying flat there can be several possible reasons.
If the felt paper was bubbly or wet when it was applied then it will cause the roof to look wavy.
Roofing isn t complex really but it is exceptionally precise.
This is the best case scenario for a wavy roof because typically the paper will end up flattening itself after a few weeks of summer weather.
Damaged decking could also cause a wavy look to shingles.
And most of them are bad news unfortunately.
The waviness generally does not cause a roof to leak but it may be architecturally unsightly or occasionally can indicate a problem.
If your shingles are curling bumpy wavy or lumpy this can potentially be a problem.
Inspect the plywood from the attic and look for cracks sagging or rotting.
Most that become wavy do so over time.
Roofs may become wavy over time or they may have been built that way to start with.
However you don t have to start panicking just yet.
A bad measurement improperly sized shingle or low quality roof can simply result in an uneven and wavy appearance which essentially means you got a raw deal.
A good contractor will never just add a layer of shingles over an existing layer of shingles they ll remove your old shingles first.
Check foundation for these 5 things.
These would include your roof s age the temperature and weather conditions and the overall roof condition.
The most likely reason an older roof would start to look wavy is that the decking has been damaged.
This is why working with trusted professionals is so important and why the lowest quote doesn t always mean the best.
This is a bad move a roofing company should not lay new roofing shingles over shingles that are wavy.
A new roof will be required after stripping both layers of shingles to achieve a quality flat look.
If any of this is found be sure to have a roofer replace any plywood with the required thickness of board that is code for where you live.
