When the contractor delivered the sad news that my roof needed replacing, that led to a discussion of material choices. I was surprised to hear that metal roofing was an option. Sure, it was fine for commercial buildings, but a home? My contractor told me that metal is used for homes more than people realize. The panels can be designed to look like just about any type of roofing you can imagine. After looking at some samples and finding out about the long life of metal roofs, I decided to give it a try. Fifteen years later, my roof is still in great shape. If you are facing a roof replacement in the near future, let me tell you more about metal roofing. I'm betting that you'll decide this solution is right for your home.
In some cases, you have the option of leaving the existing roof in place and installing a new one over it when it's time to replace your roof. However, having multiple layers of roof materials on your house is not always a good idea. Here are some of the potential complications of such a move.
It May Cover Up Defective Roof Structures
If your roofing shingles are damaged to the extent that they have to be replaced, then there is a high chance that the underlying structures or materials are also damaged. Unfortunately, it's easy to make the mistake of layering new roofing shingles over the old ones without inspecting these underlying materials. This means you may end up covering damaged roof deck and underlayment. In such a case, there is a high risk that you will have to tear up your roof sooner than you should have in order to take care of the covered up damages.
New Shingles May Not Lie Flat
Depending on the damage that has necessitated the shingle replacement, it may be that the old shingles are not as flat as they were when they were first installed. For example, poor ventilation or decades of exposure to different weather elements can make shingles curl. In such a case, the new shingles layer will not lie flat on the roof, and this encourages two serious problems. First, shingles that don't lie flush on the roof are an eyesore. Secondly, shingles that don't lie flat on the roof are more susceptible to damage than those that do.
It May Overload the Roof
Many roofing structures are not designed to bear the weight of multiple shingles. Therefore, layering shingles may force your roof to bear more weight than it was designed to do. This may not present an immediate problem, but it will become an issue if additional weight, such as the weight of accumulated snow, impacts the roof. In such a case, the roof may sag or deteriorate faster than it would have with a single layer of shingles.
It May Trap Heat or Moisture
Lastly, your new layer of shingles may trap moisture between themselves and the initial shingle layer, and this may end up affecting other structures of the roof. For example, trapped heat will accelerate the deterioration of the roof materials, and trapped moisture will cause corrosion, rot, and even leakage.
Therefore, don't assume that you will be layering your roof when the time comes for its replacement. Consult a roofing contractor like 5 Star Roofing to evaluate the condition of your home and roof and advise you on whether layering is right or not.Share