Overview
About Us
This commercial contractor is a GAF Factory-Certified Contractor.GAF trains and tests thousands of the best roofers in the country and makes sure they're appropriately licensed and insured so they can offer the best guarantees and warranties.
*Contractors enrolled in GAF certification programs are not employees or agents of GAF, and GAF does not control or otherwise supervise these independent businesses. Contractors may receive benefits, such as loyalty rewards points and discounts on marketing tools from GAF for participating in the program and offering GAF enhanced warranties, which require the use of a minimum amount of GAF products. Your dealings with a Contractor, and any services they provide to you, are subject to the Contractor Terms of Use.
Customer Reviews

"Amazing customer service! Very professional crew. Thank you."
"MJ Dalsin goes above and beyond with thorough detail when it comes to anything on the roof. Fast service, and excellent attention to detail. The group of guys over at MJ Dalsin are one of a kind and should be used for any leak, repair, you name it when it comes to your roof. MJ Dalsin should be your first thought when you hear roofing! Absolutely recommend!"
"Their quality was of work is excellent. The team Is very professional, easy to work with, and very responsive."
- "Amazing customer service! Very professional crew. Thank you."
- "MJ Dalsin goes above and beyond with thorough detail when it comes to anything on the roof. Fast service, and excellent attention to detail. The group of guys over at MJ Dalsin are one of a kind and should be used for any leak, repair, you name it when it comes to your roof. MJ Dalsin should be your first thought when you hear roofing! Absolutely recommend!"
- "Their quality was of work is excellent. The team Is very professional, easy to work with, and very responsive."
- "I am a facility manager covering 10 states for an extremely large restaurant franchise. I have used MJ Dalsin in South Dakota market for roof repairs. They have fixed all my roof issues in a timely manner and provide before and after photos. They are professionals in the roofing business and I will continue to use their services."
- "The Top Roofing Company In Sioux Falls. I operate a Full Service Hotel and they have been a wonderful partner over the last year with cleaning up our roof with repairs. They take action and do quality work! Thank You MJ Dalsin!!"
- "I don't know what I'm more impressed with; the customer service or the skill of the technicians. I'm in Brookings South Dakota and they are located in Sioux Fall South Dakota. The distance is roughly 50 miles. There have been times when I've called with a problem and they showed up the same day. We have one of those aging roofs with rocks on top of a membrane. MJ Dalsin has never failed to find the pin hole that is causing the leak. It's not just one technician with this talent, the whole crew is able to find the leak just by stepping it off from the inside of the building. I've kidded them before about working themselves out of a job because when they fix a leak it's for good. They even date and initial the patch. MJ Dalsin calls before they get here, contacts me when they get here, inspects the roof, shows me the pictures of the problem, tells me what they're going to do and then contacts me when it's done for my inspection and approval. Awesome is way over used but it's the best word to describe MJ Dalsin. Thank you!! Mark A. Werner"
Awards
Asphaltic Roofer
This contractor specializes in installing Asphaltic roofing systems.
Coatings Roofer
This contractor specializes in installing coatings systems.
Single-Ply Roofer
This contractor specializes in installing Single-Ply roofing systems.
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