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Do you need a roofing contractor? Choose the best. Les Constructions Grégor has over 20 years of experience in roofing. Our team of qualified roofers has all the skills and equipment needed to carry out roofing installation, roof inspection and roof repair, as well as roof snow removal services. We serve the entire Trois-Rivières and Shawinigan region. We are here to listen, advise and guide you through your project.