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Table of ContentsReroofing Over Asphalt ShinglesMastering Roof Inspections: Asphalt Composition ShinglesHow To Install Asphalt Shingles: 8 Steps With PicturesCommon Roofing Errors

Building business don't constantly utilize the greatest quality materials, so if you purchased an old house, a roofing replacement is an excellent opportunity to upgrade. Prior to work starts, your roofing professional can help you pick the ideal products for your roofing system. You may wish to change from OSB (oriented strand board) to CDX plywood decking or use an artificial roof underlayment instead of felt, depending upon which is best for your roofing system's structure and your environment conditions.

Throughout a tearoff, your roofer will have the chance to completely analyze all parts of your roof and make repairs to stop any establishing problems prior to they cause major damage. A new, correctly set up shingle roof can last 20 to 30 years, implying it might potentially last longer than an overlay by a years or more.

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This makes a tearoff a wise choice if you're planning to offer within the next few years. Any boost in the appraised worth of your house depends upon the condition of your existing roofing. You'll see a greater increase by changing a degrading, leaking roof than by changing a roofing with only cosmetic damage.

Proper Steps To Shingle A House Roof

It takes a lot more labor to entirely get rid of all the existing roof material and then change all the layers got rid of. The old roofing also needs to be gotten rid of correctly, which contributes to the cost. cherokee4/ Adobe Stock With this quicker, cheaper option, new shingles are installed on top of the existing shingles.

Installing New Shingles Over Old Shingles

Because there's a lot less labor associated with simply installing new shingles over old ones, an overlay will cost you less than a tearout. Your roofer won't need to rent a dumpster and deal with debris disposal guidelines, so you'll minimize expenses there, too. If you're intending on totally changing your roofing within the next 5 to ten years, an overlay is an useful method to enjoy the look of a new roofing system in the meantime.

An overlay can be finished days quicker than a tearoff. That's less time you'll require to spend out of the home, conserving you money and stress. Compared to a total roofing system replacement, there's a lot less that can go incorrect during an overlay job. There's no danger of an abrupt storm hindering the dry-in procedure, no falling particles that could damage your porch or your automobile, and no big dumpsters that could trash your landscaping.

The problem is that without removing the shingles, your roofer can't appropriately examine the roof to discover what condition it remains in. A skilled roofing professional might still have the ability to spot signs of concealed damage or make a great guess based on your roofing's age, but you're depending on luck at that point.

How To Roof Over Existing Shingles

To make matters worse, a roofing with two layers of shingles holds in more heat, which speeds up deterioration. On average, an overlay lasts around 16 years. That said, for many shingles, the guarantee stands for the same length of time whether the shingles were utilized in an overlay or a tearoff.

Two Layers Is Too Many

If your home is older or simply rather structurally unsound, an overlay might not be a viable alternative. Chances are your old shingles have actually suffered a reasonable quantity of wear that's left some of them torn, curling, or unequal. Those harmed shingles supply a subpar base for new shingles, so your brand-new roof could end up significantly flawed no matter how experienced your roofer.

If you're unhappy with the overlay, you might wind up paying for a tearout to have the whole thing redone prior to you planned. Another layer of shingles includes another layer of complexity to your roofing system. This makes it more difficult to find the origin of any issues that establish. If a leak forms, the water will move through both layers of shingles, altering instructions in such a way that hides the source.

For the most part, unless you're sure your existing roofing system remains in excellent condition, a tearoff is the better alternative. The lower cost might make an overlay noise tempting, however if it leaves damage remaining under the new shingles, it puts your entire house at danger for moisture problems.

The short answer is yes, you can lay new roofing shingles over the old ones. Let's take a look at why some property owners go this route and after that we'll think about a couple of reasons we don't advise it. But before we begin, something must be clear: adding brand-new roofing over old (often called a "roof over or re-cover") is possible only with asphalt shingles (likewise called "structure shingles").

New Roofing: Tear Off Vs. Overlay

Also, the old roof has to be in pretty good shape. Adding extra layers does not make a brand-new roofing system anymore water resistant, on the contrary, it frequently develops its own problems. The reason some property owners pick to do it is to conserve money and time. By keeping the old shingles on, they skip the unpleasant and labor-intensive tear-off step and they will save some money on the roofing system project.

Getting rid of the tear-off and disposal can easily save $1,000 to $2,000 depending on the size of your roofing, however you're actually simply delaying the expense: when it's time to change the roof again and you have no choice but to get rid of the existing shingles (2 layers is the maximum enabled in the majority of areas), you'll need to pay extra for the two-layer tear-off and disposal.

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The following list includes some factors not to do a roofing over in addition to some things to inspect out if you're seriously considering including a 2nd layer of shingles. Asphalt shingles are suggested to be installed over a plywood deck. When adding a second layer of shingles, the bumps or imperfections from the old roofing system will transfer to the brand-new layer.