Frequently Asked Questions

Answers from professional roofers

My roof leaks. Do I need to have it replaced completely?

Not necessarily. Repair work is very common and can remedy some problems. We would have to inspect the damage to see if a repair is all that is needed.

How can a building owner recognize when a roof system has problems?

It can be difficult for most building owners to identify the root cause of a problem. It’s easy to tell that your roof is leaking, but not WHY it is leaking.

What are my options if I decide to have my roof replaced?

After inspection, depending on the roof, we can come up with choices and pricing. We would move to product selection as our next step.

When do I need to pay?

We ask for a deposit, usually pay your balance on net 30.

Are your roofers your own employees or subcontracted?

Residential is subcontracted with a consistent company. Commercial is all in-house.

Do I need to be on site while the work is performed?

No, but some specific access might need to be set up ahead of time.

If I buy all the materials, can you install?


Do you give roof audits?

Yes, we do free roof inspections for homeowners and building owners. If you are looking to buy a building and need an inspection, then there would be a charge.

Can you put in solar tubes / skylights?

We work with a skylight manufacturer and we install them, but we don’t do any interior work.

Do you have references?

Yes, available upon request. Please also feel free to check out our about us page.

How long can I expect my roof system to last?

Varies based on quality of materials being installed, and the building itself. The pitch of the roof can make a difference too. We can guarantee systems up to 25 years on some systems.

Is your company licensed?

Yes, the license is at the bottom of the site.

Is there an ideal time to install a new roof?

The majority of roofing systems can be installed year round.

What if I have a question not listed on this page?

Contact us or give us a call and ask.

How long does the roof installation process take?

Every project is different, but we can give a ballpark estimate during the free inspection.

How can I determine my annual roofing cost?

If you’re a condo or a big building, as far as contracting some kind of maintenance agreement then it can vary based on the size of the building. Someone would have to come out and inspect it since every roof is different. The roofer would bring everything up to code, and then there would be a maintenance agreement after that. smaller condos are around $400 twice a year when under 20 units. Annual arrangements are pretty rare for residential outside of cleaning gutters.

I received three significantly different proposals from contractors. How should I decide which contractor to select?

If it’s a different specification, then have each contractor bid on apples to apples. If it’s a big price difference, then usually the middle one will be a good bet.

How long can I expect my roof system to last?

Our labor warranty is 5 years, and the shingles are a lifetime. Flat roofing is a 12 year and up guarantee.

What causes a roof to wear out?

Lack of maintenance is a big cause.

What is a roofing underlayment?

Acts as a vapor barrier between the shingles and the decking

Why are there streaks on my roof?

Probably mildew forming because of high humidity

Why does one side of my roof seem to age faster than the other sides?

UV rays. Usually the South side will get more exposure than the others

What is the best time to replace a roof?

Before it leaks. We do roof replacements all year round.

Can I paint my roof?

Flat modified roof or shingles, I don’t recommend it. Rubber roofs can be painted depending on the coating and should be reapplied every 10 years

How are roofing shingles made?

Fiberglass mats saturated in asphalt and then coated in granules

What are ice dams?

They usually form in overhang on shingles or flat roofs where it refreezes melting snow. It starts at the gutter and works its way up.

Lanz Garcia
Lanz Garcia
Excelente trabajo
Joe Olivier
Joe Olivier
My front porch roof and gutters were destroyed by a fallen tree during a storm. I received three bids for the job and Allendorfer came in the middle, but they were the most thorough in terms of their written estimate. Work went smoothly once they received the deposit and the work was done very well. Communication with the office was great. I plan on working with Allendorfer in the future for any roofing and gutter work and will recommend to friends and family.
Dm Ws
Outstanding job. Did a 90' x 30' flat condo roof in the 60656 area. Starting work on a 40+ year disaster and left it a "shining gem". Commercial gutters, downspouts, rebuilt the chimney and installed a cap. Building is unrecognizable. The top floor can't say enough good things about the insulation and noise reduction. If you are looking for decent, honest people who know their stuff than please give them a chance. Fair pricing, top quality materials (not second hand knock offs) and punctual top notch performance. Thank you Rich and crew for an outstanding job, peace of mind, patience and a sense of humor.
Roger Clemson
Roger Clemson
Excellent roofers who were punctual, hardworking and did a great job fixing our roof. We recommend Allendorfer Roofing as a professional and honest company that does the job. Thank you Conrad and Richard and your roofing crew.


With our roofing knowledge and the products we offer, we can put an end to any existing commercial roofing problems.


Leaky roof? Hail damage? Strong winds tearing up the shingles on your home? We are here to assist home owners in the Chicago area.


We are dedicated to ensuring that our work is done on schedule for minimum downtime, and get you back to business as normal ASAP.


If you're interested in a roof repair or replacement and would like an estimate simply give us a call as we are more than happy to help.

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IL LIC #104-000123
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