Preserving Building Integrity.
Securing Asset Value.

Premier building envelope consultation, design, and condition analysis.

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Our Services

Comprehensive solutions for building longevity and performance. Click a discipline to learn more.

Roof Consulting

  • Roof Condition Assessments
  • Leak Investigations
  • Infrared Services
  • Design Services
  • Tendering Services
  • Contract Admin / PM
  • Quality Assurance
  • Expert Witness
  • Testing Services
  • Safety Reviews

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Building Envelope

  • Envelope Condition Assessments
  • Water/Air Leakage Investigations
  • Infrared Services
  • Design Services
  • Tendering Services
  • Contract Admin / PM
  • Quality Assurance
  • Expert Witness
  • Testing Services
  • Safety Reviews

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Waterproofing

  • Waterproofing Condition Assessments
  • Infiltration Investigations
  • Design Services
  • Tendering Services
  • Contract Admin / PM
  • Quality Assurance
  • Expert Witness
  • Testing Services
  • Safety Reviews

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The Importance of Building and Roof Condition Assessments

Conducting regular building and roof condition assessments is essential for maintaining the integrity and value of your property.

Preventive Maintenance

Identifying potential issues early allows for timely repairs, preventing minor problems from escalating into costly repairs or replacements.

Safety Assurance

Ensuring the structural soundness of your building and roof protects the safety of all occupants, reducing the risk of accidents and injuries.

Financial Planning

Accurate assessments provide critical data for budgeting and financial planning, helping you allocate resources effectively for maintenance and repairs.

Energy Efficiency

A well-maintained building and roof enhance energy efficiency, leading to lower utility bills and a reduced environmental impact.

Regulatory Compliance

Regular assessments ensure your property meets local regulations and standards, avoiding potential fines and legal issues.

Longevity

Routine maintenance extends the lifespan of your building and roof, safeguarding your investment and ensuring long-term functionality.

Property Value

Maintaining your property in top condition enhances its market value, which is beneficial if you plan to sell or lease in the future.

MDS Building Sciences can assist building owners with comprehensive assessment services. Our team of experts is equipped to provide thorough evaluations and actionable insights to keep your property in optimal condition.

Recent Projects

From complex roof replacements to new construction monitoring.

Leadership & Experience

Denis Theriault, RRO

Denis Theriault is a seasoned professional with over 25 years of experience in the roofing and building enclosure industry. While his primary strength lies in roofing, he has accumulated significant expertise in waterproofing, cladding, and fenestration.


Denis has led multiple complex projects with a focus on technical excellence, client satisfaction, and team collaboration. His technical repertoire includes conducting Roof and Building Condition Assessments, pre-performance audits, and legal reviews.


A recognized leader in the field, Denis is a Registered Roof Observer (RRO). He has dedicated over a decade to the IIBEC board, serving as President in 2020-2021 and currently directing the Advocacy Committee.

  • ✅ Registered Roof Observer (RRO)
  • ✅ IIBEC Past President (2020-2021)
  • ✅ IIBEC Advocacy Director (2025-Present)
  • ✅ 25+ Years Experience
Denis Theriault, RRO
IIBEC Southern Ontario Chapter Logo

Proudly Affiliated with IIBEC Southern Ontario

Our active leadership within the IIBEC Southern Ontario Chapter underscores our commitment to technical excellence, ethical consulting, and continuous education. By staying at the forefront of industry advocacy, MDS Building Sciences ensures that our clients benefit from the latest standards and best practices in building enclosure science.

Start Your Project

Ready to assess your building's health? Get in touch with our team.

231 Oak Park Blvd., Suite 301, Oakville, Ontario, L6H 7S8

+1 (647) 933-9807