Meets the requirements of ASTM C 1177
Very Severe Hail: Achieves FM 'VSH' approval with adhered 60 or 80 mil (smooth back) JM TPO membrane and standard JM TPO membrane adhesives when 4x4' panels are adhered in low rise foam adhesive ribbons, 12" OC min.
Enhanced Face Mat: Coated fiberglass facer ideal for fully adhered systems provides a broader compatibility and higher performance with roofing adhesives.
Fire Performance: FM Class 1 for fire barrier requirements and UL Class A unlimited slope with excellent surface burning characteristics. 5/8" thickness meets the requirements of Type X per ASTM C 1177.
When it comes to your roof, hail can cause significant damage. However, incorporating the appropriate cover board into your roofing system can provide you with superior protection. Upgrade your roof to VSH-rated with DensDeck StormX Prime Roof Board today!
Very Severe Hail is two inches or wider in diameter.
Hail can fall as speeds up to 72 mph
The Very Severe Hail region was recently expanded. Are you in the danger zone? Visit the FM Global natural hazards map here.
Johns Manville offers one of the most comprehensive portfolios of commercial low-slope roofing solutions. We have a long standing dedication to providing solution-based systems for building owners.
Here you will find quick links and cheat sheets to Johns Manville roofing systems code approvals and ratings.
Guarantees and Roof Maintenance
Support services can include: conceptual product information, building science, wind uplift data, national and local code understanding, FM Global® and UL® regulations, fastening patterns and sheet layouts, installation guidelines and standard details.
Re-roofing mechanically attached or ballasted insulated single-ply systems now have the potential for recycling versus contributing to a landfill.
Your resource for all JM documents in one place.
The Submittal Wizard is a tool to help you pull together the necessary documents for your submittal package.
