Noticing bumps, lumps, or raised areas on your roof? These are all telltale signs of buckling shingles. To the naked eye, buckling shingles look like an air bubble under your roof. What is actually happening however, is that your roof shingles, sheathing and felt are being stretched due to expansion. And while expansion is typical for any roof, and not a problem when planned for, buckling shingles are not. Here are three reasons shingles buckle:
A Poorly Ventilated Attic. When your attic is not ventilated correctly, moisture builds up and causes the plywood in your roof to swell. Buckles can then occur on your roof, or on the underside – on your attic ceiling. So how do your check to see that your attic is correctly ventilated? One of the easiest ways is to place a moisture meter in your attic and measure the amount of condensation and moisture buildup. A recommended humidity level is between 35-45%. Any more than that, and excess moisture begins to cause a problem for your home. But you also need to consider air flow. When warm air meets cold air, condensation happens. So to help prevent this, aim for a ventilation system that is balanced – with 50% intake and 50% exhaust.
Not Enough Spacing for the Sheathing Panel. As every roof consists of felt underlayment, sheathing, and shingles, consideration must be given to the spacing between to allow for the normal amount of expansion. When not enough spacing is given, and the sheathing panel is installed too tightly, buckling becomes more likely. This is also why most manufacturers recommend a 1/8th inch space between all panel edges to allow for expansion.
A Leak in the Roof. While you may have controlled for ventilation in your attic, if water is collecting under your shingles due to a roof leak, no amount of ventilation will help. When water seeps into the underlayment, sheathing, and plywood of your roof, not just is expansion a huge problem, but so are mold and mildew. If you suspect a roof leak, your first call should be to a licensed roofing contractor. While some leaks can be repaired, the longer a leak is allowed to continue the more damage it can cause and the greater the chances that your roof will need to be replaced.
This article is brought to you by ASAP Roofing, a licensed roofing contractor with offices in Denver, Colorado, Dallas, Texas, Indianapolis, Indiana, and New Orleans, Louisiana. ASAP Roofing specializes in roofing restoration, water and hail damage, and exceptional customer service.