A roof-over means layering new asphalt shingles over the old ones. It’s an alternative to stripping the roof to expose the deck and replace the shingles. Most building codes allow this simpler and less expensive roof replacement technique. Certified Home Improvement, LLC presents its pros and cons to help you weigh your options.
Pros to a Roof-Over
The most common pro for roofing over existing shingles is saving money. The average re-roofing job will cost about $600 less than a tear-off job. You’ll also save a little more on cleanup, disposal costs and dumpster rentals. Without a tear-off, the job won’t be as messy and it will save time.
Cons to Layering over a Shingle Roof
When you’re layering over the old roof, you can’t do a full inspection of the roof’s sheathing. You can’t see leaks, bad flashing, damaged or rotted wood, and algae growth. And you can’t fix or prevent what you can’t see. You’re actually adding a second roof and its added weight stresses the roof decking and can lead to roof repair. This is especially worrisome in areas that get heavy rain and snowfall.
Premature Aging of Shingles
Premature aging is one of the most common afflictions ailing roofs all over the country. The many layers of shingles make your roof hotter because they trap the heat between them. This could lead to premature aging of the shingles. It’s especially true if you’ve layered over warped shingles.
Lower Resale Value and Voided Warranty
If you try to sell your house after a roof-over, a home inspector will likely have a negative view. Layered shingles or siding could show potential problems for the new homeowner. It could also shorten or even void your shingle warranty.
It’s clear that there are more cons than pros in a roof-over. The only real upside is cost, but the savings may not be worth it when you finally need a roof replacement. At that time you will spend any money you saved on a roof tear-off.
Certified Home Improvement, LLC is a certified master installer of GAF products. We provide roofs for increased curb appeal and unparalleled protection. We are a local business with deep roots in the Detroit Metro area and serve homeowners in Wayne, MI. Call us at (734) 329-0119 for a free estimate.