Tapered insulation solves the dual challenge of flat roof drainage and thermal performance. Learn how to design and lay out tapered systems using industry best practices.
Overview
Low-slope roofs rarely have structural slope. Tapered insulation provides positive slope to drains while achieving thermal resistance. Typical slope values are 1/8″ or 1/4″ per foot using polyiso crickets and saddles.
Layout Strategy
- Start from primary drains and work outward with positive slope
- Use crickets behind curbs and large equipment
- Combine tapered and flat layers to hit R-value targets
- Minimize material waste with efficient panel sizing
🔍 Quick Picks
- Tapered Polyiso Board:Â Rmax Tapered Polyiso Insulation
- Cricket Panels:Â Tapered Cricket Insulation Block
- Adhesive for Tapered Systems:Â Polyurethane Roof Panel Adhesive
Best Practices
Coordinate tapered layout with structural layout and drain locations. Use CAD or BIM tools for layout planning and clash detection. Label and stage tapered bundles for accurate field install sequencing.
Conclusion
Tapered insulation solves multiple roof challenges—drainage and R-value—in a single product. Design early to avoid material waste and performance issues during construction.
Disclosure: As an Amazon Associate, EnvelopeIQ earns from qualifying purchases.
