Sub Slope Silicone
High-Solids Silicone Coating for Low-Slope Roofs
Sub Slope Silicone is a moisture-cure, single-component silicone roof coating designed for high-movement, low-slope assemblies. With 90% solids by volume and industry-leading elongation (468%), it forms a seamless, breathable membrane that resists ponding water, UV, and extreme temperature swings.
This coating requires no primer for most substrates—including TPO, PVC, EPDM, and weathered metal—and delivers unmatched adhesion and sag resistance. It's ideal for low-slope roofs where water flow is limited and durability is non-negotiable.
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Features & Benefits
Superior Flexibility & Crack Resistance
- •468% elongation with 288 psi tensile strength
- •Doubles the elongation of most competitor products
- •Resists cracking and tearing under dynamic roof movement
Ponding Water & UV Protection
- •Withstands standing water without degrading
- •UV stable and rated for 5,000 hours of accelerated aging
- •Maintains reflectivity and thermal stability from –80°F to 350°F
No Primer Needed for Most Surfaces
- •Bonds to unprimed TPO, PVC, EPDM, and weathered metal
- •Compatible with primed cap sheet, mod bit, and other commercial substrates
- •No mixing required for up to 6 months in storage
Fast Application & Moisture Cure
- •High-solids formula cures with ambient moisture
- •Spray, roll, or brush on with minimal prep
- •Recoat window >8 hours; full cure in 48 hours
Resilient, Breathable Membrane
- •Allows vapor transmission while blocking liquid water
- •Withstands expansion, contraction, and impact
- •Excellent sag resistance for vertical or sloped applications
Where to Use It
Built for demanding commercial and industrial roof environments:
Technical Highlights
| Solids by Volume | 90% |
| Solids by Weight | 91% |
| VOC Content | <50 g/L |
| Reflectivity (White) | 0.87 |
| SRI | 110 |
| Tensile Strength | 288 psi (ASTM D-2370) |
| Elongation | 468% (ASTM D-2370) |
| Tear Resistance | 30 lb/in (ASTM D-624) |
| Service Temperature | –80°F to 350°F |
| Permeance | ASTM E-96 – Breathable |
| Recoat Window | >8 hours |
| Cure Time | Full cure in 48 hours |
| Coverage | 1 gallon per 100 sq ft = 14 mils DFT |
| Application Methods | Spray, roll, brush |
| Shelf Life | 6 months unopened |
| Packaging | 5-gallon pails, 55-gallon drums |
| Colors | White, Light Gray; custom available with lead time |
Supporting Resources
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Low-slope doesn't mean low-performance. Sub Slope Silicone delivers the flexibility, adhesion, and ponding resistance that flat roofs demand—without primers, mixing, or compromise. Whether you're repairing a retrofit or coating a critical system, Sub Slope Silicone is built to outperform.