If you’ve been in the roofing industry for as many years as us, you will often have heard the same questions being asked over and over. That’s exactly why we decided to compile this list of roofing FAQ - to provide homeowners with enough information so they make an informed decision about this important issue.

Q. How will I know it’s time to replace my home’s roof?

A. Below are common signs that your roof might have to be replaced soon:

· Missing shingles. Shingles can become loose as the roof grows older and eventually the wind can blow them away. Once your roof has a significant number of missing shingles, rainwater will very likely find its way to the attic and other parts of the home.

· Curling and/or bucking shingles. This happens when moisture causes nails to become loose, which eventually also loosens the shingles. The roof is then exposed to the elements, which could cause leaks and moisture damage.

· Mold in your attic. If an inspection reveals that there is mold in areas like the plywood on the roof’s underside and rafter beams, you might have to seriously start thinking of replacing the whole roof.

· Granules in the gutter. The asphalt shingles that make up the majority of U.S. roofs are made of minute granules. When these start to come loose, it can negatively affect the ability of the roof to protect your home. If you regularly start finding granule fragments in the gutters, it’s probably time to consult a roof replacement expert.

· Clear signs of roof rot. Once root rot develops, you could soon be facing huge damage to the rest of your house. How does one know that roof rot has started to develop? Get on a ladder and walk on the roof. If it has a decidedly spongy feeling, get a roofing contractor to confirm that the problem is roof rot.

Q. Should I have the roof replaced in summer or winter?

A. The weather in your part of the country can play a major role in this decision. If you live in West Bloomfield, Bloomfield Hills, Birmingham, Rochester, or Troy in Michigan (where our roofing replacement company operates), you will know that the winters are freezing cold and it often snows. Here, the summer months are undoubtedly your best option - although, depending on the weather, late spring and early fall could also be possible.

Q. How long will it take to have my home’s roof replaced?

A. The answer to this question depends on quite a few factors. On average, a roof replacement only takes a few days. It could, however, take longer depending on the following:

  • More complex roofs, e.g. those with steep pitches, will usually take longer to replace.
  • Of course, the roof of a 2000 sq ft house will take more time to replace than that of a 1000 sq ft one.
  • The type of roofing material will typically also play an important role. An asphalt shingle roof should be up and ready within three days. Slate tile and clay roofs could take twice as long.
  • The weather is another important factor to take into account. An unexpected thunderstorm will most likely delay work. That is why many contractors would check the weather forecast, choose a suitable day, and then try to complete the job in one day. Our view is that quality of work should always get priority over speed. A major job like a roof replacement should be done right the first time. 
Q. Is there any preparation work the homeowner should do before a roof replacement?

A. A full roof replacement will involve the existing roof being stripped away. This could mean that shingles, bolts, nails, and other debris will end up all over the place. That’s why it’s better to move your car (or cars) to another location (unless it’s a double-story home with the garage on the bottom floor).

Also, remove furniture, grills, etc., from the patio, cover plants and shrubs, and make sure there are no toys or lawn decorations lying around.

While damage to the inside of your home is very unlikely, it’s nevertheless worth the time and effort to remove anything valuable from the attic and to move your pictures and artworks to a safe location. A roof replacement could also involve a fair amount of noise, so it’s probably a good idea to temporarily relocate your pets and/or kids to a quiet spot during the work.

Q. How long does a new asphalt shingle roof typically last?

A. Asphalt shingle is by far the most common type of roof currently found in the United States. More than 80% of new homes in the country have asphalt shingle roofs because it’s relatively affordable and it can last between 15 and 30 years. Exactly how long an individual roof will last depends on many factors though, including the quality of workmanship and materials and the weather.

Asphalt shingles are composed of an organic material base like cellulose or fiberglass covered by an asphalt coating. This provides durable protection against rain, wind and UV rays. Over time, the sun’s heat softens the asphalt, which helps to create a watertight seal and to further bond the shingle in place.

Q. How much will a new asphalt shingle roof cost?

A. According to the website, a new asphalt roof for the average 2,000 to 3,000 sq ft family home will cost anywhere between $9,500 and $18,700. This amount can, however, vary widely. In areas where the cost of living is significantly higher (e.g. San Jose, San Francisco Bay area, San Diego, Los Angeles, Seattle, Portland, Boston, Portland, Washington DC, New York City, and Northern Virginia), roof replacements will also be more expensive.

The type of system you want to install and the overall complexity of the roof will also play a role.

After photo of a home in Clarkston, Michigan, Grennan Construction completed a Roof replacement using CertainTeed Landmark shingles in the color pewter.


The Bottom Line About Roof Replacements 

Thank you for visiting our Roofing FAQ page. By now you will probably understand that one of the most important decisions you have to make when it comes to replacing your home’s roof is choosing the right contractor. At Grennan Construction you can get a totally free roof estimate from a highly experienced company that always strives to deliver world class quality at a competitive price.

We offer a full roof replacement service using Owens Corning and CertainTeed products. If at this stage you are, however, still trying to figure out common industry terms like ‘the exposed nail method’, ‘fire rating, and ‘hex shingles’, why not first take a look at our glossary of common roofing terms?


Grennan Construction has proven to be a leader within the residential roofing company industry, serving with integrity while offering a range of residential roofing and siding services that meet your needs.


No single home improvement project has such a significant impact on your home as installing a new roof. Regardless of your roofing material, Grennan Construction has the product line and expertise to complete your job correctly, on time, and within your budget. You can rest assured that not only will your home look beautiful, but it will also be fully protected from the elements and will likely increase in value.


Siding does more than simply provide beauty and value to your home. Your choice of siding also greatly impacts your home’s ability to protect you from the elements and from unwanted pests. Many options are available, and the experts at Grennan Construction will consult with you to determine what best matches your tastes and your home’s needs.


Let Grennan Construction help cut your energy costs while increasing both your curbside appeal and the value of your home. Some companies might try to sell you only one brand of windows. At Grennan, we understand each home is unique. We offer many quality window brands and styles to choose from. Our experts have over 12 years of experience helping home owners find the perfect solution for their properties. All of our window installation projects are backed by a full manufacturer’s warranty.


Grennan Construction has found Leaf Relief by PlyGem to be the most effective gutter protection system on the market. Leaf Relief is more effective than other types of gutter protection at keeping natural debris, such as leaves, twigs, and pine needles, from blocking your gutters. We have not only found it to be the most effective gutter protection, but also the most invisible, as it lays flat and fits snugly on top of your gutter.


Hail has the potential to cause hairline cracks and punctures in shingles, which can lead to a devastating outcome, including delamination. If not addressed, these issues can cause problems with the structure and soundness of your home. Grennan Construction specializes in the repair, restoration, and/or replacement of all types of exterior products damaged by Michigan weather.


For expert brick work and tuck pointing anywhere in, on, or around your home, depend on Grennan Construction. In recent years, we have expanded our services to include concrete repair and replacement, stucco repairs, cultured stone veneer, and many other services similarly related to property repair and restoration. We offer expert construction, inspection, and repair of any brick chimney, brick fireplace, brick wall, or other brick structure.




When a roof can account for as much as 40% of the average home’s exterior, many factors weigh into the choice of materials. Some surfaces are more beautiful than others. Some offer greater resilience or endurance. Some are more affordable. But the one roofing surface which offers all those attributes in balance is the asphalt shingle.

Now accounting for about 80% of the residential roof surfacing in the United States, asphalt shingles are measured against a variety of standards that evaluate fire and wind resistance, tear strength, and other key performance indicators.

Asphalt shingles have a glass fiber reinforcing mat manufactured to the shape of the shingle. This mat is then coated with asphalt which contains mineral fillers. The glass fiber mat is not waterproof by itself. Its purpose is for reinforcement. What makes the glass fiber shingle waterproof is the asphalt. However, the asphalt itself will not stick to the mat. For this reason, “fillers” are used. The fillers in the asphalt cling to the glass fibers in the mat. The asphalt then encapsulates the glass fibers, fills all of the little holes and voids in the mat rendering it waterproof. After this cools a bit, adhesive asphalt is used to cover the mat and the ceramic granules are then embedded.

CertainTeed Select ShingleMaster vector logo

Grennan Construction is proud to install shingles from only the highest-quality manufacturers – such as CertainTeed, GAF and Owens Corning. When your roof is on the line – only the best will do.

Example of Grennan Constructions Bronze level roof shingles. Residential roofing company Michigan
Example of Grennan Constructions Silver level roof shingles. Residentail roofing company Michigan.
Example of Grennan Constructions Gold level roof shingles. Residential roofing company Michigan.


The ceramic granules are there for two reasons. The primary reason is to protect the shingles from the sun. The sun’s UV rays are very damaging to asphalt and cause it to deteriorate prematurely. This is one of the reasons that gravel is used on built-up roofs. The second and more obvious reason for the granules is aesthetics. Asphalt shingles are available in a wide variety of colors to match almost any facade or landscape.

By submitting this form, you are consenting to receive marketing emails from: . You can revoke your consent to receive emails at any time by using the SafeUnsubscribe® link, found at the bottom of every email. Emails are serviced by Constant Contact


Join over 3.5K Oakland County residents by signing up for our informative, monthly newsletter.

Since 1988 we have been serving our community by providing the best residential roofing and siding services in Oakland County, Michigan. Today, sign up to receive monthly updates, home maintenance advice, and special deals available only through our email newsletter.



We proudly serve Auburn Hills, Berkley, Birmingham, Bloomfield Hills, Clawson, Clarkston, Commerce, Davisburg, Farmington Hills, Ferndale, Franklin, Hazel Park, Highland, Holly, Huntington Woods, Lakeville, Leonard, Keego Harbor, Lake Angelus, Metro Detroit, Milford, Madison Heights, New Hudson, Novi, Oak Park, Oakland, Oakland County, Orchard Lake Village, Pleasant Ridge, Pontiac, Rochester, Rochester Hills, Southeast Michigan, Sylvan Lake, South Lyon, Southfield, Union Lake, Walled Lake, Troy, Villages of Franklin, Lake Orion, Ortonville, Oxford, Waterford, White Lake, West Bloomfield, & Wixom.

Grennan Construction Logo white with transparent background vector

Copyright © 2020-2024 Grennan Construction

Web Design by Galvanized Creative

Privacy Policy


Get Your Free Estimate! Skip to content