Most communities have building codes that prevent homeowners and roofers from installing more than.
New roof some shingles not flat.
Roof shingles are not lying flat new shingles not sealing down.
A more serious problem could be that they shingled over extremely buckled felt paper.
Before new shingles seal down they can look a little lumpy and uneven but once the roof gets hot enough they should soften flatten and form a permanent seal.
After installation an appearance of bumpiness or lifted shingles may be evident.
Most felt paper will not lay tabletop flat in cold weather.
The shingles do not flatten out or conform to the roof deck because they were distorted while in the bundle.
In most cases new asphalt shingles are installed by overlapping one from another or by interlocking this creates a barrier against different forces of the weather most notable rain snow.
It may just be that the shingles need some warm sun and everything will be fine.
Nails in your yard.
The minimum pitch required for shingles is 2 12 which means for every 12 inches the roof rises 2 inches.
Some times they settle down and sometimes they don t.
These would include your roof s age the temperature and weather conditions and the overall roof condition.
There are different types and styles of roof shingles that are either flattened or curved when facing against the roof.
The hump that you may be seeing could be the result of stacking the shingle bundles on the ridge of the roof.
Pramote polyamate getty images.
Standard asphalt shingles feature an adhesive strip that softens during warm weather.
Which is why in it is bad to stack shingles over the ridge a crap shoot.
Then when used they do not lay flat.
Any slope that has a pitch less than 2 12 is too flat for shingles and should be covered with flat roof materials such as tpo pvc epdm rubber or others.
Check the roof by applying pressure to areas of the roof.
Shingle bundle distortion is a phenomenon that can cause shingles to not lay flat after installation.
If your roof shingles are not lying flat there can be several possible reasons.
Lumpy bumpy or curling shingles that do not lie flat can be problematic but don t hire a new roofer yet.
Why are new roof shingles not flat.
Meaning that they heat up and bend stretch.
What causes this distortion.
In some instances the shingles will seemingly fix themselves almost like magic.
Other times it will require costly repairs to correct the issue.
Sometimes this problem is more apparent on north facing roof slopes that don t heat up sufficiently for the shingles to seal until summer.