Frequently Asked Questions

Answers from a Trusted Roofing Contractor in St. Louis.

When you’ve got questions about a roofing or exterior project in Missouri, you can turn to Tesson Roofing & Exteriors for answers delivered straight from our experienced professionals. The questions and answers listed here are meant to save you time and expedite a possible roof installation or repair. Guided by the information we have provided in our answers below, you can learn more about the processes involved in the installation of siding, gutters and much more. Read on to learn more!

Should I lay over existing shingles or replace them completely?

The answer to this question rests on weighing the pros and cons of replacement. To help you, we have started the process for you:


  • Replacement is cost effective. The cost of tearing off and disposing the waste is not incurred.
  • You’ll be less likely to inflict damage to the property while tearing off existing shingles.
  • The process is not as labor intensive, which means the work can be completed more quickly.


  • Manufacturers will not warranty shingles laid over existing shingles.
  • Adding layers apply additional weight to existing decking and rafters, possibly causing settling or collapse.
  • The process can cause your roof to retain moisture, in turn, rotting or warping your deck. This can also lead to algae growth or discoloration.
  • Additional layers can cause excessive heat buildup, severely shortening the life of a roof system.
  • The cost of removing the additional layer of your next roof replacement could be high.
  • The application of a second layer often causes a wavy, uneven appearance.
  • Laying over existing shingles makes it more difficult to securely fasten a new layer.
  • You may be unable to determine the existence of rotten or damaged decking.
  • The insurance company has compensated you to remove existing layers now, but will not pay to remove it again later.

As you can see, the cons outweigh the pros 3 to 1, and for these reasons, Tesson Roofing and Exteriors, LLC highly recommends tearing off the existing layer(s) and installing new shingles.

How does proper roofing ventilation help maintain the life of my home?

Roof ventilation attempts to keep hot, stale air and moisture from accumulating in the attic. By reducing the temperature differences between the outside air and the inside air, you can greatly extend the life of your roof and your home. Besides the high-energy costs associated with improper ventilation, trapped moisture can create an unhealthy living environment from airborne dangers. Some of the most common of these are mold and dust.

Is an indestructible roof an option?

The short answer is no. While manufacturers engineer their shingles to be strong and weather-resistant, hail and sleet are capable of damaging any type of roof, no matter how strong the material. Although there is more to a roof than shingles, these act as your first line of defense in a roofing system, which is why we recommend investing in the best materials. Not only do they look great and increase the value of the home, they also come with a generous warranty.

Does the loss of granules degrade the overall production of my shingles?

Not necessarily. These granules are intended to resist solar radiation and help extend the life of the roof. It is completely normal for some excess granules to loosen themselves because wind, rain, and other forms of erosion are commonplace. This is expected and only becomes a concern when the shingles become physically damaged, punctured, or worn down until the tar is exposed.

My roof has dark patches or discoloration. Is this normal?

Depending on what the shingle material and weather are like in your area, these circumstances can be rather common. The discoloration is usually due to algae growth and can easily be confused with granule loss, damage, or some other sign of pre-mature roof failure. This is mostly an aesthetic concern and can be removed with proper materials and practice. Algae growth should not affect the life of the roof unless it is layered in extreme amounts and / or covering damaged areas.

Can I paint my roof for better protection?

You can, but this is usually not recommended. Painting the rooftop will not necessarily harm the roof, but it requires consistent maintenance and can be very time consuming. Also, maintaining a professional appearance can become a very tedious task. Different layers of roofing adhere differently to the paint, and discoloration becomes common because the solar rays tend to consistently hit certain areas more than others. Extreme temperatures also tend to cause discoloration.

What are some common signs of roof damage?

Noticing leaks is the easiest way to identify roof damage. You can also check for missing or broken shingles that are leaving parts of the roof exposed to erosion. Extreme differences in heating / cooling bills or the inefficiency of it can also indicate the need for repair. The only way to stop a leaking roof from damaging your home and personal belongings is by preventing it from leaking in the first place. Our field consultants are trained to distinguish between damaged areas and undamaged areas, so call us today if you have any concern.

Do I have to be home when a field consultant estimates damages on my home?

We do not require you to be home, but the decision is completely up to you. If you cannot be there, one of our field consultants can take the required notes and contact you at your convenience later that evening or at a different agreed upon time.

Where are you located?

Our address is:

Tesson Roofing & Exteriors, LLC.
656 Axminister Drive
Fenton, MO 63026


What are your business hours?

Monday through Friday: 8:00 am – 5:00 pm If someone is not available, please leave a detailed message or contact us via e-mail, and someone will contact you as soon as possible. We check our messages before and after business hours, and someone is usually available outside of these hours, even on the weekends!

Do you charge for your estimates?

Absolutely not. While other companies may charge to come out and look at your property, Tesson Roofing & Exteriors, LLC does not. Our concluded damage assessment is free of charge and there are no obligations.