Why You Should Not Opt for Shingle Overlay During Reroofing

If you want to replace your roof, you can save money if you don’t maintain the current roof and install the new shingles over it. However, you should know that a roof overlay (where you have multiple layers of shingles on the roof) comes with a few potential problems. Below are some of those problems.

Roof Overload

Roofing shingles are relatively heavy. One hundred square feet of shingles typically weigh between 150 to 240 pounds, but the weight can even exceed 400 pounds for some high-quality shingles. If you decide to have two layers of shingles on your roof, the roof will have to bear double that weight. The roof will get even heavier if it accumulates snow during the winter.

Unfortunate, many roofs don’t have the strength to bear all that weight. The damage might not be immediate, but the overload accelerates your roof’s wear and tear. In a worst case scenario (say if the roof support structures are weak) the roof might even cave in.

Hidden Roof Damage

A big advantage of a tear-off is that you get to see the condition of the roof structures under the old shingles. That way the contractor can gauge whether the support structures are damaged or can last many more years still.

If you opt for an overlay, you won’t know whether the structures under the roof are intact or damaged. That means the hidden damage can fester for a few more years and prompt premature roof replacement. The hidden damage also increases the risk of injuries to roofers or anyone who walks on the roof; they may fall through the roof if they step on a damaged area.

Moisture Trap

Moisture exposure accelerates the wear and tear or degradation of most roofing materials. That is why roofing contractors install a waterproofing barrier before they install shingles. Unfortunately, you can’t install a waterproofing barrier over shingles that are already on the roof.

Thus, if you decide on a shingle overlay, moisture can get trapped under the top shingles and cause damage. Before long, your roof may develop leaks due to the moisture issue.

Evenness Problems

Shingles manufacturers expect roofing contractors to install shingles over flat surfaces. The shingles need to lie flush on the roof so that they can’t allow water or debris under them and they can’t break easily too. If you decide on shingle overlay, the new shingles won’t lie flush on the roof because the top surfaces of the existing shingles are not exactly flat.

Warranty Problems

Shingle manufacturers understand the heightened risks of damage that roofs with shingle overlays face. Such risks may lead to premature damage that wouldn’t have occurred sans shingle overlay. Manufacturers can’t take the blame for such damages so don’t expect the manufacturer to pay for damage due to a double layer of shingles on the roof.

Future Double Tear-off

If you want a shingle overlay to save money, then you should know that the overlay decision only delays the inevitable task. Since you can’t have more than two layers of shingles on the roof, you will have to tear-off both layers the next time you want to replace the roof. You will use a lot of money for the replacement since double tear-off costs more than a single roof tear-off.

Issues with Some Shingle Type

Lastly, not all shingles qualify for the overlay option. In particular, don’t expect to overlay your roof if you have dimensional shingles; in that case, you must tear-off the current roof.

Talk to Cloise & Mike Construction Inc if you want to replace your roof. We will work with you to ensure you get the best possible roof for your house at a reasonable budget. Since good roofers are always busy, start your roof replacement plans in advance to get the best service.

4 Tips for Maintaining Your Asphalt Roof

Asphalt roofs are a popular option for their affordable price. However, they have a shorter life span than most other roofing materials. For this reason, you need to properly maintain your roof. With regular maintenance, you’ll be able to spot problems before they become expensive leaks. Check out these four tips for maintaining your asphalt roof.

1. Kill and Remove Moss

Plant matter may occasionally collect on your roof, but unless you have a lot of windstorms or overhanging branches, most of it is washed away with the rain. However, moss doesn’t wash away because it actually grows on the shingles. It usually starts growing around the edges of shingles, but as the moss continues to thrive, it may lift the shingles, which exposes the roof to rot and leaks.

Moss also works like a sponge. When it rains, the moss absorbs a lot of water, allowing it to sit on your roof for long periods of time. This further exposes the roof to rot. You can remove the moss yourself with moss killer and/or a wire brush, but if your roof is old, this may cause further damage unless you are experienced. Talk to a roofing contractor for help removing moss from an old roof.

2. Check Shingles for Wear and Tear

Your shingles are a great place to measure the integrity of your roof. When shingles start showing signs of wear and tear, water is more likely to penetrate the roof. Look for signs of curling, cracking, or missing shingles, and check the gutters for signs of granules from the shingles.

If you do spot signs of wear and tear, you’ll need to determine if a repair or replacement is necessary. This decision largely depends on the age of your roof. If it is 20 years old or so, it probably needs to be replaced, but if it’s newer, a repair may be enough. If the damage is minor, you may even be able to replace a few shingles yourself.

3. Clean and Maintain the Drainage System

Your roof needs an adequate drainage system to properly remove water. For sloped roofs (like asphalt roofs), gutters and downspouts are usually the ideal way to drain water toward the street. However, damage and debris can affect the drainage, so you need to check for signs of holes or dents and clean your gutters.

If the gutters aren’t cleaned on regular basis (or can’t drain properly from damage), they trap water. This may damage the gutters or roof because of the extra weight and standing water. However, eventually, when the gutters get too full, the water will spill out, which may cause damage to your home’s siding or even foundation.

4. Examine the Flashing

In many cases, the problem may not be your shingles. You may have damaged flashing. Flashing is metal used to protect the roof edges around chimneys, vents, etc. Exposure to the elements, especially water, can eventually cause corrosion or holes, which provide a perfect entry for moisture.

If the damage is minor, you can probably repair it yourself with roofing cement. You’ll need to patch the hole, using the same material as the flashing and attach it with the roofing cement. Roughing the area with a wire brush will help the cement hold better. For large holes, you may need to have some of the flashing and shingles professionally replaced.

Asphalt roofs are extremely affordable, and with proper care, your asphalt roof can last a long time. However, even something as simple as forgetting to clean your gutters can cause major damage. For more information about asphalt roof maintenance, repair and replacement, contact us at Cloise & Mike Construction, Inc., today.