Overlaying shingles prevents roofers from properly installing water and ice leak barriers. Small roofs cannot handle immense amounts of weight.
Adding a second layer to your roof only increases that strain , and can cause further roof problems, especially if the area you live in receives a great deal of snow each year. Re-roofing can adversely affect the warranty on new shingles. Specific geographic areas will have guidelines regarding how many roof layers are allowed on buildings. Many Arizona homeowners with shingle roofs do decide to roof over their existing shingles because:.
As you can see, there are many benefits to installing a new roof over your existing one, and we do many of these for Arizona homeowners. Here are some reasons to do that. Posted By Lyons Roofing. Many Arizona homeowners with shingle roofs do decide to roof over their existing shingles because: Less expensive. By adding another quality layer of shingles on your roof, you are actually adding one more protective layer to your roof.
This will, along with the underlayment, roof deck, and the original layer of shingles, function as combined protection from damages and will stop any leaks from coming into your home. We see this layer as an upgrade, or even a rejuvenation of your roof that boosts your leak protection. It will further help to direct the water from your roof and into your gutters and downspouts, preventing the problem of pooling. Reroofing can also be done when you simply want or need a change on your roof — you may want a different design or color, or you may be completely renovating your home so you want the roof to match your new style.
Installing a new shingle layer will give your roof depth and even a three-dimensional appearance, as it is slightly raised due to the existing layer of shingles beneath it. When it comes to the financial aspect of reroofing, it is undoubtedly less expensive than a complete roof replacement. The main reason for that is that there is no need for a tear off of the old roof — of the existing shingles and the underlying structures.
This means that there is significantly less labor needed, as well as time spent on the project, and therefore the costs are lower. Your roofer can immediately start with the installation of the new roof, without spending time on shingle removal and disposal. A professional and honest roofing contractor will and should always warn you if your roof is not a good candidate for an overlay or reroofing. That is what a roofing inspection is for and should always be done before any action is taken on the roof.
You can ask for a few roof estimates from different contractors just to be sure that you are doing the right thing, so that you can choose the best roofer for yourself. Installing a new roof over an existing one can only be done if you have shingles because you can only put shingles over shingles. It is not possible to mix materials, nor to install a new layer over slate or wood tiles.
Another reason is curling shingles, as you can only install a new layer if the first one is completely flat and level. Shingles can curl over time due to different reasons, so if you still want to go with the option of reroofing, you should first get to the bottom of this problem with your roofer and replace the curling shingles.
Furthermore, if you already have two layers of shingles because you have already reroofed once, another layer is not an option, as the roof can get too heavy. As opposed to a roof replacement, it does not involve tear off, which means that it reduces both time and cost for the project. It is always a good idea to consult with a roofer you trust, who can do an inspection, give you an accurate estimate, and advise you on what the best option is for you.
Rated 4. If you are completely renovating your home and your roof needs to match the new style, adding a different design or color to your roof can completely mix up the look and feel of your home. Installing a new shingle layer will give your roof depth and even a three-dimensional appearance, as it is slightly raised due to the existing layer of shingles beneath. When it comes to the financial aspect of reroofing, it is undoubtedly less expensive than a complete roof replacement.
The main reason for that is that there is no need for a tear off of the existing shingles and the underlying structures. This means that there is significantly less time and labor needed and therefore the costs are lower. Your roofer can immediately start with the installation of the new roof shingles, without spending time on shingle removal and disposal. You can ask for a few roof estimates from different contractors just to be sure that you are doing the right thing. That way you can choose the best roofer for yourself.
A second reason can be the presence of existing damage to the wooden structure underneath, such as rot or sagging. When using IKO bitumen roof shingles in combination with the best techniques, the renovations of a worn out shingle roof becomes a mostly simple and inexpensive job.
Before starting off any project, first check out whether the existing roof shingle layer could remain in place or has to be removed. Depending on local building codes at least three layers of roof shingles can be applied before stripping off the roof shingles is necessary.
Inspect the complete roof construction looking for defects before starting to reroof. The existing shingles roof should be dry before reroofing as trapped moisture can shorten the lifespan of your roof structure. Clear the roof from debris and fungus before application. Ridge and hip covering has to be removed.
New hips and ridges have to be installed after the new layer has been applied. Make sure the nails are long enough to assure sufficient anchorage. To nail down new hip and ridge cap shingles even longer nails are needed.
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