The Performance Case for Silicone Roof Restoration Coatings
Third-party research summary for commercial building owners & property managers considering roof restoration vs. replacement
* Can be up to 5% in hot, cooling-dominated climates (ENERGY STAR / LBNL)
■Silicone is an inorganic polymer — it contains no carbon-hydrogen bonds and is inherently immune to UV degradation. Unlike acrylics and urethanes, silicone does not oxidize, chalk, or lose tensile strength under UV exposure over its service life.
Source: Henry Company White Paper; Value Proposition of Silicone Coatings; ASTM G154 accelerated weathering testing
■CRRC-rated white silicone coatings achieve initial solar reflectance of 0.88+ and retain 3-year aged reflectance of 0.80+ — exceeding ENERGY STAR minimum thresholds of 0.65 initial / 0.50 aged for low-slope commercial roofs.
Source: Cool Roof Rating Council (CRRC) Rated Products Directory; ENERGY STAR Roof Products Program
■A silicone restoration membrane applied over an existing sound substrate typically costs 50–70% less than full membrane tear-off and replacement, while delivering equivalent or superior waterproofing performance and a new manufacturer warranty.
Source: NRCA Roofing Manual; Coating & Waterproofing Institute; industry contractor pricing data
■Silicone restoration projects are significantly faster than full replacements, reducing labor costs and eliminating multi-day building disruption and business interruption associated with tear-off operations.
Source: NRCA Best Practices Guide; Coating & Waterproofing Institute
■Because restoration avoids tear-off, landfill disposal costs of $1–3/SF are eliminated entirely. Over 20 billion pounds of roofing waste enters U.S. landfills annually — a liability increasingly scrutinized under ESG reporting frameworks.
Source: U.S. EPA Roofing Waste Estimates; SPFA Environmental Impact Bulletin
■Silicone is the only coating category rated for sustained ponding water exposure. Unlike acrylics, which soften and lose adhesion when submerged, silicone forms a crosslinked film that remains dimensionally stable and fully waterproof under standing water indefinitely.
Source: Coating & Waterproofing Institute; SPFA Technical Bulletin; Henry Company product testing
■This makes silicone restoration the preferred system for flat roofs with inadequate drainage slope — addressing the #1 cause of membrane failure without structural re-grading.
Source: NRCA Roofing Manual; Coating & Waterproofing Institute
■Silicone restoration membranes bond directly to TPO, EPDM, PVC, BUR, modified bitumen, metal, and concrete substrates without primers in most applications, reducing material cost and installation time.
Source: Sherwin-Williams Uniflex Silicone 44 TDS; Coating & Waterproofing Institute application guidelines
■Silicone’s high elongation (200-500%+ depending on product) allows the restoration membrane to bridge existing minor cracks, seam separations, and substrate movement without cracking or delaminating — restoring watertightness without full membrane removal.
Source: Sherwin-Williams Uniflex Silicone 44 Technical Data Sheet; ASTM D412
■The Cool Roof Rating Council (CRRC) — the independent nonprofit that rates all roofing products — documents average annual cooling cost reductions of 7–15% for CRRC-rated white reflective coatings on commercial buildings. This is a net figure accounting for the minor winter heating penalty in northern climates.
Source: Cool Roof Rating Council (CRRC); Home and Building Owners Resource; DOE Building Technologies Office
■Important distinction: silicone coatings reduce radiant heat gain only — they have no insulation value. In heating-dominated climates like Northeast Ohio (IECC Zone 5A), the primary benefit is reduced summer cooling load and peak demand, not year-round HVAC energy savings. For total HVAC energy savings including heating, see PRS’s SPF + Silicone system (15–30%, ORNL/DOE Zone 5A).
Source: ENERGY STAR Cool Roof Program; ORNL Roof Savings Calculator; CRRC
■White silicone coatings reduce rooftop surface temperatures by 50–80°F vs. dark uncoated membranes at peak summer hours — lowering heat transfer into occupied space, reducing AC runtime, and extending membrane life by reducing thermal cycling stress.
Source: EPA Heat Island Group; ORNL / DOE Roof Savings Calculator; ENERGY STAR
■CRRC-rated silicone systems qualify for ENERGY STAR designation, supporting LEED credit eligibility, potential utility rebates (including FirstEnergy / AEP Ohio commercial programs), and compliance with ASHRAE 90.1 cool roof prescriptive requirements.
Source: U.S. Green Building Council; ENERGY STAR; ASHRAE 90.1-2022
■Insurance carriers increasingly recognize properly warranted restoration systems as roof maintenance — not replacement — enabling buildings to maintain ACV coverage continuity without triggering a depreciation reset review.
Source: NRCA classification standards; property insurance underwriting guidelines
REAL-WORLD CASE STUDIES
Silicone restoration performance across building types and climates
Rohm & Haas / Univ. of Southern Mississippi / Mississippi Power Co.
In a controlled side-by-side study, two structurally identical flat-roof buildings were constructed — one with a standard black asphalt-coated roof, the other with a white reflective liquid-applied coating. With all other variables held constant, the building with the reflective coating consumed 21.9% less summer air conditioning energy. Conducted in Mississippi (hot, cooling-dominated climate), this study established the maximum-end benchmark for cool roof coatings. In northern climates like Zone 5A (NE Ohio), cooling-season savings are real but more modest — CRRC independently documents 7–15% of annual cooling costs as the net average across climates.
Source: Henry Company White Paper; Rohm & Haas / Mississippi Power Company, 1985; CRRC Home and Building Owners Resource
LBNL Heat Island Group — Cool Roof Energy Modeling
LBNL’s Heat Island Group, led by Dr. Hashem Akbari, developed the foundational computer modeling framework for cool roof energy savings used by DOE, ENERGY STAR, and ASHRAE. Their research established that raising roof reflectivity from the 10–20% typical of dark membranes (TPO, EPDM, BUR) to 60%+ — achievable with any CRRC-rated white silicone coating — reduces building cooling-energy use by more than 20%. The same research quantifies the urban heat island benefit: reflective roofs lower ambient outdoor temperatures in dense commercial districts.
Source: Levinson & Akbari, Energy Efficiency 3/1, 2010; LBNL Report LBNL-40673; DOE Building Technologies Office
City of Sacramento Cool Roof Program — Silicone Coating Initiative
As part of a DOE-funded cool roof demonstration program, the City of Sacramento applied white reflective coatings to municipal buildings and measured energy performance over multiple years. Buildings with white silicone-based coatings showed rooftop surface temperature reductions of up to 70°F vs. uncoated dark roofs on identical summer days. Annual energy cost savings averaged approximately $0.23/SF of coated roof area — validating LBNL modeling predictions in a real-world institutional setting. The program data was incorporated into California’s Title 24 energy code cool roof requirements.
Source: DOE / LBNL Cool Roof Demonstration Program; California Energy Commission; LBNL Report LBNL-40673; Konopacki et al., 1998
WHY SILICONE OUTPERFORMS ACRYLIC
| Property | Silicone | Acrylic |
|---|---|---|
| Ponding water resistance | ✓Fully rated — zero degradation | ✗Softens, blisters, loses adhesion |
| UV resistance over time | ✓UV-inert; no oxidation or chalking | ✗Degrades under prolonged UV exposure |
| Rain-readiness after application | ✓As fast as 15 minutes (moisture cure) | ✗Requires 24–48 hrs to cure/dry |
| Elongation (life of coating) | ✓200-500%+ initial; retains flexibility | ✗Elongation decreases as coating ages |
| VOC content | ✓Under 10 g/L (Uniflex 44) | ✗Typically 50–100+ g/L |
| Longevity / warranty ceiling | ✓20-year renewable warranty available | ✗Typically 10-year maximum |
All data points are derived from independent third-party research, industry technical bulletins, and peer-reviewed studies. Actual performance varies based on existing roof condition, substrate type, climate exposure, and application quality. Silicone restoration is appropriate only for roofs with structurally sound, dry insulation— moisture-compromised substrates require partial or full replacement prior to coating. Pinnacle Roofing Systems provides this reference for informational purposes. Contact us for a site-specific roof assessment and no-obligation restoration evaluation.
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