About GENCAN Roofing

GENCAN Roofing - Industry Leader’s of Roofing Repair & Installation Services

Gencan Roofing and Waterproofing ltd. is a roofing company based in Oshawa, Ontario, Canada, that specializes in flat roofing installations, repairs, and maintenance services. We have been in business for over 25 years and have built a reputation for providing high-quality, professional roofing services to residential, commercial, and industrial customers in the GTA and surrounding areas

We offer a range of roofing solutions, including TPO roofing, PVC roofing, EPDM roofing, metal roofing, and more. We pride ourselves on using only the highest quality materials and providing excellent customer service. 

about gencan roofing

Our team of experienced and certified professionals can provide expert advice and assistance with all aspects of flat roofing, from initial design and installation to ongoing maintenance and repairs.

GENCAN Roofing History

Gencan Roofing and Waterproofing ltd was founded by Darren Peters in 1975. Since then we have been providing outstanding commercial and industrial roofing services. Gencan Roofing and Waterproofing ltd is synonymous with quality and has been serving in Oshawa, Toronto, Durham Region, Newmarket, Woodbridge, Brampton, Mississauga, Markham, Etobicoke, Port Perry, Newcastle, York Region, Peel Region, the GTA and Southern Ontario area for more than four decades. Our success is the result of long-term relationships we have developed with our customers.

Our Mission

Since the inception of our company we have worked upon two principles – honesty and quality service. Gencan Roofing and Waterproofing ltd have been successful in building a strong reputation in Oshawa and the adjoining areas including Markham, Newmarket, Cambridge and Brampton. By providing consistent, high quality roofing specifications, superior workmanship, quality customer service, trust, and integrity, we have been able to establish lasting relationships with our clientele. We take our job very seriously and make sure it is done right the first time.

Our Key Competencies

Roofing has been an important aspect of building construction in the GTA and surrounding areas for many years. Historically, flat roofs were common in the region, as they were well-suited to the area’s harsh climate and allowed for the construction of larger, more complex buildings. As a result, many roofing companies in the region have specialized in flat roofing solutions, including membrane roofing systems such as TPO, PVC, and EPDM.

Gencan Roofing and Waterproofing ltd. is one of the roofing companies in Oshawa and GTA and surrounding areas  that has adapted to these changing trends and offers a range of roofing solutions to meet the needs of modern buildings. While I don’t have specific information on the company’s history, their reputation for high-quality roofing services suggests that they have been a trusted and reliable partner for many customers in the region for many years.

If you are looking for a reliable and experienced roofing contractor in Oshawa and the GTA and surrounding areas , Gencan Roofing and Waterproofing ltd. is one of the best option for you. You can explore our website or contact us directly to learn more about our services, pricing, and availability.

Why Choose Our GENCAN Roofing Services?

Gencan Roofing and Waterproofing provides quality roofing services for over four decades. We are insured and licensed service providers who are readily available 24/7 to serve you with the best repair, installation and maintenance services at affordable rates.

Hear From Our Customers

Darren Thank you for the work you have done for us ..... couldn't have got a better person doing my roof
Monument Depot Inc


I had a flat roof in Toronto, they responded to me and gave me good advice, i got a low quote, it was way better then the others, i gave Darren the job and i am happy i did, my roof hasn't had a leak yet. Thanks Darren


Our house lost a bunch of shingles during the recent wind storm. We had originally used Gencan Roofing and Waterproofing ltd to install the shingles about 8 years ago. Without any hesitation they were able to find our matching shingles and had the repairs done within 48 hours of the storm. Unbelievable Service and they did this repair at no cost. I would highly recommend Gencan Roofing and Waterproofing ltd as they have great customer service and workmanship.


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