Why is My Chicago Flat Roof Sagging? Rotten Substrate Issues

A sagging or soft spot on a flat roof is a significant red flag. It points to a more serious underlying problem than a simple membrane repair: rotten substrate. The substrate, or roof deck, is the foundational layer beneath your roofing membrane and insulation. When water finds its way through even the smallest opening in the membrane, it saturates this substrate, causing the wood to rot and lose its structural integrity.

This isn't just a matter of a small leak. A compromised substrate can lead to:

Dangerous Structural Weakness: The roof deck can no longer support its own weight, the weight of rooftop equipment, or snow loads, creating a safety hazard.

Persistent Leaks: The membrane can no longer lie flat, creating new areas for water to pool and leak.

Insulation Failure: Saturated insulation loses its thermal properties, leading to higher energy bills.

Ignoring a sagging roof will only lead to more extensive and costly damage to your building's interior and structure.

At Anchor Point Roofing, we specialize in expert commercial roof repairs in Chicago. We know that a lasting repair starts with a solid foundation. Our process for fixing a rotten substrate is thorough and precise:

Professional Inspection: We conduct a detailed inspection to accurately identify the extent of the rotten substrate and the source of the water intrusion.

Strategic Replacement: We carefully remove the existing membrane and insulation in the affected areas and then replace the rotten substrate with new, sturdy decking material.

New Membrane Installation: Once the new substrate is secure, we install a new modified bitumen membrane. This membrane is seamlessly tied into your existing roofing system, creating a continuous, watertight surface.

Protective Coating: For a smooth modified bitumen membrane, we apply a protective aluminum coating. This coating reflects UV rays, extends the lifespan of the repair, and helps protect your roof from future deterioration.

Don't let a sagging roof compromise the safety and value of your commercial property. Anchor Point Roofing provides reliable commercial roof repairs in Chicago, giving you a lasting solution and peace of mind.

Location: Chicago, IL