Our standard of service soars above the competition.

DWS has spent 20 years building our reputation as Ottawa’s best commercial roofing contractor, and we built that success on our customer service. We have a large permanent team, guaranteeing consistent results and service for every project.

Flat Roof Systems

We focus on finding a flat roofing system that will meet both your project and budgetary needs. As your project proceeds through the bidding process, it’s important to know what materials, systems, and companies are at your disposal. DWS prides itself on offering a wide range of options to meet all your project needs.

• Conventional assemblies

• Built-up felt and asphalt-bur

• Modified Bituminous Membrane-MBM (“Modbit”) and inverted Modbit

• TPO Thermoplastic, fully adhered and mechanically fastened

• EPDM rubber, loose-laid and mechanically fastened

• PVC Polyvinyl Chloride, mechanically fastened and fully adhered

• Inverted assemblies

• Hot applied rubberized asphalt-HARA

Waterproofing

DWS roofing services also has the experience and systems that will best maintain your property. Our waterproofing applications are engineered for your commercial and multi-residential builds. Our teams are experienced in applying these systems, and can meet your needs regardless of the elements and environment. Plus, we’re always available for repair and maintenance cases that may occur with your pre-existing properties.

• Spray-applied foundation coating with drainage composite

• Self-adhering SBS membrane

• Hot applied rubberized asphalt

• Cold applied fluid elastomeric

• Modified Bituminous Membrane-MBM (“Modbit”)

• Drainage composite with self-adhered membrane for foundations

• Drainage composite with bentonite sheet for foundations

Re-roofing of your existing build

DWS has developed a well-earned reputation as Ottawa and Eastern Ontario’s re-roofing experts. Our teams work cleanly and quickly to remove your existing materials and install the best system for your building. We can work to your specifications, or offer you innovative new systems and solutions that may offer additional benefits.

Repairs and maintenance

We are always here for both new and existing clients who may need roof maintenance, emergency roof repairs, or other unplanned servicing. Our team is large and we are always ready to come on site, offer an assessment, and swing into action. We’ll be honest with you about what needs to be done, and what can wait.