3 Reasons Spray Foam Roofing Won't Work for Your Building

Spray foam roofing is one of the best commercial roofing systems available — but it's not right for every building. Here are 3 situations where it's genuinely not the right choice.

1. Wet Insulation Exceeds 25%

When moisture has infiltrated more than 25% of the roof's insulation, the wet sections must be removed and replaced. At high percentages, this becomes so labor-intensive that a full tear-off and replacement is more cost-effective. Foam restoration works best when wet insulation is limited — extensive moisture damage is a genuine disqualifier.

2. Structural Deck Failure

Spray foam addresses roofing system problems — it doesn't fix structural problems beneath the roofing system. If the roof deck has rotted, corroded, or structurally failed, the underlying deck must be repaired or replaced before any roofing system (foam or otherwise) can be installed. Foam on a compromised deck will fail along with the deck.

3. Building Codes Require Full Replacement

Some jurisdictions require full tear-off when the existing roof has reached maximum allowed layer count (typically two layers). If a building already has the maximum permitted roofing layers and code requires tear-off before any new system, foam restoration may not be code-compliant without tear-off. Check local codes before assuming restoration is permissible.

The Honest Assessment

West Roofing Systems is committed to honest recommendations — if foam isn't the right solution for your building, we'll tell you and explain why. A professional inspection with core samples will reveal whether any of these disqualifiers apply to your specific situation.