Summer heat is tough on school facilities, and your roof is no exception. Built-up (BUR) and single-ply roofs take a beating from extreme heat, UV radiation, and heavy storms — and small problems now can turn into expensive emergencies by fall.
Here’s what your roofs are up against in the summer — and how to stay ahead:
1. Expansion and Contraction Stress Your Roof
During the day, high temperatures cause roofing materials and flashings to expand; cooler nights or sudden weather events like hail cause them to contract. This repeated movement can eventually weaken seams and materials.
- What can go wrong: Cracking, splitting, and seam failures, especially around joints and penetrations.
- What to do: Inspect your roof regularly for gaps and seam issues. Make sure expansion joints remain flexible and are properly installed.
2. UV Radiation Accelerates Aging
Just like skin, your roof is vulnerable to sun damage. UV radiation breaks down roofing materials over time, making them brittle and prone to cracks.
- What can go wrong: Surface erosion, faster aging, and deterioration of protective coatings.
- What to do: Where eligible, apply or maintain reflective roof coatings to block UV rays and extend the life of your roof.
3. Roof Surface Temperatures Soar
Dark BUR surfaces can reach 150°F or more in the summer sun. Single-ply membranes—especially darker types like EPDM—can absorb similar amounts of heat, speeding up material breakdown.
- What can go wrong: Faster asphalt degradation in BUR, adhesive failures, and weakened insulation in both BUR and single-ply systems.
- What to do: Use cool or reflective roof coatings to minimize heat absorption, protect materials, and reduce energy costs.
4. Trapped Moisture Creates Blisters
If moisture is trapped within the roof layers, high heat can turn it into vapor, leading to pressure pockets that weaken the membrane.
- What can go wrong: Blisters, bubbles, membrane separation, and eventual leaks.
- What to do: Address moisture issues early. Consider restoring older roofs with high-performance fluid-applied membrane systems to prevent further damage.
5. Flashing and Sealants Deteriorate
High temperatures dry out adhesives and weaken the bond between flashing and roofing membranes.
- What can go wrong: Cracked sealants, peeling flashings, and increased vulnerability to water infiltration—especially during heavy summer storms.
- What to do: Regularly inspect and reseal flashings, drains, and expansion joints to maintain watertight integrity.
Don't let summer heat turn small issues into big expenses. Act now:
- Inspect your BUR and single-ply roofs for damage.
- Protect your investment with coatings and repairs.
- Restore eligible aging roofs before school is back in session.
Don’t wait. A simple summer inspection could ultimately save your school district thousands.
About the author:
Kevin Butler is a Senior Field Advisor with Tremco Roofing and Building Maintenance.