Proper attic ventilation is the keystone in creating effective hot/cool air circulation in your home. This could include vents, soffets, and baffles to create air channels. Without these simple materials your attic will effectively be an oven in the summer and a freezer in the winter. Not only will the hot air increase the overall temperature in your house during summer months, but it will also "bake" your shingles and thus shorten your shingle lifespan exponentially.
If your current shingles are peeling off it is very likely that this is the main contributor. Conversely, during winter months an improperly vented attic will lead to ice and snow building on your roof and causing serious damage to your shingles as well as structural roof damage.
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