Heavy Rain Alert: How to Protect Your Commercial Roof from Water Damage

Over the last few days, Wisconsin has been pounded with 6–8 inches of rain in a short time. While it might be welcome for lawns, it’s a serious challenge for commercial roofing systems—especially flat or low-slope roofs that rely heavily on drainage to keep water from pooling.

If you own or manage a commercial property, you may already see roof leaks appearing. These aren’t always a sign of roof failure—they’re often the result of drains being overwhelmed during extreme rainfall.

Why Heavy Rain Is a Problem for Commercial Roofs

Commercial roofs are designed to shed water efficiently, but record rainfall can push systems beyond their limits:

• Clogged drains — Leaves, branches, and debris block scuppers and downspouts.

• Ponding water — Standing water increases weight load and finds even the smallest vulnerabilities in the roofing membrane.

• Flashing and seam stress — Water intrusion often starts around HVAC units, vents, and roof penetrations.

• Overwhelmed drainage systems — No matter how well-designed, drains have capacity limits during heavy storms.

If left unaddressed, flat roof drainage problems can quickly turn into expensive emergency roof repairs.

Immediate Steps to Protect Your Roof

Here’s your post-storm checklist for avoiding water damage:

✅ Inspect all drains — Make sure they’re free of debris so water can flow off the roof.

✅ Remove ponding water — Even a small amount can accelerate roof deterioration.

✅ Check membrane seams and flashings — Look for separation, bubbling, or damage.

✅ Document damage — Take photos for insurance claims and future reference.

The Cost of Waiting

Delaying action can lead to:

• Damaged insulation and roof decking

• Mold growth inside your building

• Disruption of business operations

• Costly structural repairs

Remember: Water intrusion is easier to prevent than to fix.

Call TRS Commercial Roofing for Emergency Roof Service

At TRS Commercial Roofing, we specialize in emergency commercial roof repair and preventive maintenance for Wisconsin businesses. Our crews are equipped to remove standing water, clear drains, and assess any damage before it gets worse.

📞 Call us today at 262-800-5686 — We’re ready to protect your investment, keep your building dry, and give you peace of mind.