What’s the Difference Between Mechanically Attached and Fully Adhered Commercial Roofs?

When choosing a commercial roofing system in Florida, the method of attachment is a major decision. The two most common options for single-ply membranes like TPO and PVC are:

Mechanically Attached Roofs

• Fastened with plates and screws through the membrane into the roof deck

• Often installed in rows and seams, which are heat-welded afterward

• Quicker installation, especially in large open roofs

• Easier to inspect and repair

Best for: Wide-open commercial buildings with solid structural decks
Consider: May be more vulnerable in hurricane-prone coastal areas without proper edge securement

Fully Adhered Roofs

• Membrane is glued directly to the insulation or roof deck using bonding adhesive

• Creates a continuous seal, reducing flutter in high winds

• Tighter, cleaner appearance and quieter under wind load

Best for: High-rise buildings, irregular layouts, or wind-exposed zones
Consider: Installation takes more time and surface prep; substrate must be smooth and compatible

What Matters in Florida?

Florida's High-Velocity Hurricane Zone (HVHZ), especially in Miami-Dade and Broward counties, enforces stricter attachment standards.

• Wind uplift resistance is critical: Fully adhered systems usually perform better in uplift tests

• Building height and exposure: Tall or coastal buildings benefit from fully adhered systems

• Code compliance: Local building codes may dictate the attachment type

So Which One Should You Choose?

There’s no one-size-fits-all answer. Roof Nuts can help you choose the right system based on:

• Your building’s structure

• Location and wind zone

• Insurance requirements

• Budget and long-term ROI

FAQs

Is a fully adhered roof more expensive than mechanically attached?
Yes, it typically costs more due to added labor and adhesive materials. But it may offer better long-term durability and wind resistance.

Can you switch from a mechanically attached to a fully adhered system?
Yes, but it may require deck preparation or additional insulation layers. A site inspection is needed.

Which system is better for high winds?
Fully adhered systems usually offer better wind uplift performance, which is important in Florida’s hurricane-prone regions.

How do I know which is right for my building?
Call Roof Nuts at 904-694-3426 for a free roof assessment and guidance based on Florida codes and your specific needs.

Want to make sure your roof is Florida-wind-zone ready?
Call Roof Nuts today at 904-694-3426 for expert advice and reliable commercial roofing solutions.

We serve all across Florida—Jacksonville, Orlando, Tampa, Miami, and beyond.