This is the result of poor ventilation a.
Roof shingles bowing.
Sagging bowed or wavy roof check the attic for 6 things.
Rubber roof shingles rubber slates sources defects inspections rubber shingle product sources installation defects repairs synthetic roof repairs plastic or synthetic roof inspections.
Roof shingles are not lying flat.
Ask your roofing contractor or the roofing supplier how to submit a claim.
Lumpy bumpy or curling shingles that do not.
They give the roof a finished look while forming a protective seal.
You might have to add exhaust fans to adequately ventilate the attic space and remove built up moisture.
The roof repair specialists http www mrroofrepair ca show this 10 year old roof in toronto with buckling shingles.
Cedar shingles bowing and cupping i use a perforated tar paper program pressure treated lattice stainless 2 staples just above the next course but line and a grade r r s at a 4 exposure.
This article describes shingle shake or slate type roofing made of rubber usually recycled rubber tires possibly using granulated or crumb rubber or in some cases actual pieces of recycled rubber tires.
I m close to 10 houses done with this program over years with out an issue.
I had my shingle roof replaced a couple of weeks ago using 25 year shingles and 30 lb.
Finally i have heard of very cheap asphalt shingles swelling and buckling from moisture absorption but this should not be the case with a name brand shingle unless you got a defective batch.
Then the beam or roof may sag.
I e the original roof was a light wood shingle roof and the new replacement roof is a concrete tile roof weighing 5 or 10 times more than the original roof.
The shingles on your roof serve a dual purpose.
One can see clearly lots of ripples bumps all over the roof but one section is much worse than the rest.
Follow the manufacturer s recommendations for ventilation requirements.
Carefully lift the upper shingle and secure the new shingle with roofing nails.
Those ripples bumps can be pressed down easily which suggests that there is space between the shingle and decking i e shingles are not properly supported by the decking where there are ripples.
Repair of curled cupped roof shingles.
If you notice a shingle starting to curl you can forestall the inevitable curling by gluing down the curled section.
Over time the cumulative effects of sunlight moisture and changes in temperature can cause asphalt roofing shingles to curl or cup.
Getting the local tamko rep to take a look would be a good idea.
If the roof has.
