The problem is not the roofers but the fact that your sheathing.
Wavy roof sheathing.
To avoid having a wavy roof use a licensed roofer and not just a.
A roof can only be as good as its roof deck and your roof sheathing is the sheet material which forms the surface that the shingles are nailed to.
Osb roof sheathing wavy with truss lines visible the third photo is more telling than the other two photos.
Not sure if that s the right technical term i didn t realy notice it before tearing off the shingles but some of the sheathing is a little wavy.
I m going to replace at least two boards.
Ultimately there is no single answer for why a roof may look wavy but could be a combination of factors.
A wavy roof is an unsightly thing.
Most that become wavy do so over time.
Poor framing practice is one of the.
It immediately detracts from the appeal and look of a home.
Usually sheathing is made from osb or plywood and it is manufactured by laminating thin veneer strips or wood fibers under pressure.
Potentially it could be caused if the shingles were not properly aligned or not nailed fully.
Roofs may become wavy over time or they may be built that way to start with.
From that low resolution photo it appears that the lines trace the ends of the osb panels the 4 foot ends of the panels and not particularly the truss lines.
We will highlight the 4 main causes of a wavy or warped roof.
Which is why the roof looks wavy after the roofers finished.
The waviness generally does not cause a roof to leak but it may be architecturally unsightly or occasionally can indicate a problem.
Quality of the roofing work in general can also cause a roof to look wavy.
But the roof rafters and thus its surface had sagged badly enough to be noticeable from outdoors as a rather wavy roof.
For instance put a straight edge on it and if you find a 1 2 dip then replace it.
When also combined with thin 1 4 plywood or 3 8 thick roof sheathing we also sometimes find sagging even between rafters.
When a homes foundation shifts is not level or damaged then the foundation issues may be reflected by a sagging bowed or wavy roof.
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While a wavy roof is aesthetically unpleasing does it affect the performance of the roof.
Is there a rule of thumb on when you recommend replacing it.
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.
The old shingled roof was just removed and new shingles installed.
