Roofing Retrofitting in Oklahoma City, OK

Roofing retrofitting — installing a new roofing system over an existing one without full tear-off — can be a cost-effective solution for commercial buildings where the existing system is at end of life but structurally sound and free of significant moisture infiltration.

The primary advantage of retrofitting is cost: avoiding tear-off labor and disposal significantly reduces project cost. The primary risk is installing over unknown or deteriorating substrate conditions. We evaluate retrofit candidates carefully through visual inspection, core sampling, and structural load review before recommending this approach.

When retrofitting is appropriate, we typically use TPO or EPDM overlay systems with tapered insulation added to improve drainage. This approach can improve the building's thermal performance while extending the roof life 15-20 years.

Not every roof is a retrofit candidate. Significant moisture infiltration, structural load concerns, or incompatible existing substrates require tear-off. We make honest assessments and recommend the approach that protects the building long-term, not the option that's easiest to sell.

1. 1 Feasibility Assessment: We perform a thorough evaluation including multiple core cuts to assess existing insulation moisture levels, membrane condition, and deck structural integrity. If moisture exceeds acceptable thresholds, retrofit is not appropriate and we recommend tear-off instead.
2. 2 Structural Load Review: Adding a new roofing system over an existing one adds weight. We verify the structure can support the additional load — particularly important for older OKC commercial buildings that may not have been designed for the additional weight of modern insulation and membrane systems.
3. 3 System Design: We design the retrofit system with tapered insulation to improve drainage — a critical upgrade for Oklahoma buildings where ponding water is the leading cause of premature membrane failure. The new insulation layer also improves the building's thermal performance, reducing energy costs.
4. 4 Installation: The new membrane system is installed over a separator sheet or recovery board placed on the existing roof surface. All seams are heat-welded (TPO) or adhesive-bonded (EPDM) per manufacturer specifications. Edge details and penetration flashing are installed to integrate with the new system.
5. 5 Warranty Documentation: We coordinate manufacturer inspections when required for extended warranty programs and provide complete documentation to the property owner.