It’s never easy to hear that you need a new roof. However, you need to do what’s necessary to protect your home. But you want to make sure you’re doing what’s right both for your home and your wallet.
That being said, we’ve never really talked about an option you may be faced with. A roof over or a full tear off. We’ll go over what the difference is and when to go one way or the other.
Tear Off or Roof Over?
Once you’ve decided to reroof, you’ll have to decide whether to install your new roof over the existing one or whether to tear the old one off. Once again, the choice comes down to saving a little money now and risking greater expenses down the road, or spending more now to do the job right and minimize future expenses.
If you already have two layers shingles, the decision is made for you. The International Residential Code (R907.3) says that you cannot put a new roof over two or more applications of any type of roof covering. Part of the reason has to do with weight and its effect on the structure of your home. A shingle in your hand may not feel as though it weighs much, but cover a roof with 1,500 square feet of them, and it’s nearly the equivalent of parking a two-ton SUV up there!
If you have only one layer of asphalt shingles, you may decide to have them removed even though you’re not required to. Doing so may save you money in the future. For example, if you live in an area that is subject to high winds, keep in mind that shingles will hold better if fastened directly to the roof deck. In addition, removing the old shingles will allow you to inspect the roof deck or sheathing.
The opportunity to evaluate the condition of your roof deck is valuable, insofar as you can check for wood rot and the presence of inadequate sheathing fasteners. By making any necessary repairs and adding fasteners to the sheathing (especially annular nails or screws), you will avoid the dramatic losses caused when sheathing blows off the roof, allowing rain to cause extensive interior damage.
Beginning your roofing job with a clean roof deck also means you have the option of adding ice-and-water-shield membrane along the eaves. It can only be applied to a clean deck but will help prevent damage due to ice dams.
A new roof is a big expense but should last you for as long as possible. Do it right and you’ll have one less thing to worry about when storm winds blow. In the long term, you’ll also end up with more money in your pocket.
As always, if you have any questions just give us at DYMI Construction a call or drop us a line. We’re always happy to help you with any of your roofing needs.