Versico VersiGard EPDM 90-mil Ballasted: Ballasted Roofing System
Published: 2026-06-24
Ballasted EPDM is the most cost-effective commercial roofing system for large, flat roof areas — warehouses, distribution centers, big-box retail. The membrane is laid loose over the insulation and held in place by the weight of ballast: 1,000-1,500 lbs per square of river-washed stone (1.5-2.5 inch diameter) or 20-25 lbs/ft² of concrete pavers. There is no mechanical attachment and no adhesive — the ballast alone resists wind uplift, protects the membrane from UV and hail, and provides a Class A fire rating.
Ballasted EPDM's key advantage is installed cost: at $3.50-5.50/ft² installed, it is typically 30-50% cheaper than fully-adhered TPO or PVC systems. The tradeoff is weight: a ballasted roof adds 12-18 lb/ft² dead load, requiring the structure to be designed or verified for this additional weight. Ballasted systems are also more difficult to locate leaks — water travels freely under the loose-laid membrane, potentially emerging far from the penetration point.
EPDM Membranes Cost by City
| City | Installed Cost Range |
|---|---|
| Dallas TX | $4.00-6.50/sq ft |
| San Antonio TX | $3.75-6.25/sq ft |
| Houston TX | $4.25-7.00/sq ft |
| Chicago IL | $4.25-6.75/sq ft |
| Phoenix AZ | $3.75-6.00/sq ft |
| Denver CO | $4.25-6.75/sq ft |
| Atlanta GA | $3.75-6.25/sq ft |
Costs include materials + labor for commercial installation. Prices vary by building size, access, and local labor rates.
🛡️ Roof Insurance Claim Process (Step-by-Step)
- Document the Damage — Take photos/video of all damage from multiple angles before any tarps or temporary repairs. Include close-ups of impact marks, granule loss, and membrane punctures.
- Prevent Further Damage — Install emergency tarp or temporary seal. Most policies require you to mitigate further damage. Keep receipts for emergency repairs — they are reimbursable.
- File the Claim Promptly — Contact your insurance carrier within 24-72 hours. Provide: date of loss, type of damage (wind/hail/other), photos, and a rough estimate if available.
- Schedule Adjuster Inspection — The carrier sends a claims adjuster. Have your roofing contractor present during inspection — they can point out damage the adjuster might miss, especially on membrane seams and flashings.
- Get Contractor Estimates — Obtain 2-3 estimates from licensed roofing contractors who work with insurance claims. Ensure estimates use Xactimate pricing (industry-standard insurance estimating software).
- Review the Adjuster Report — Compare the adjuster's scope of work with your contractor's estimate. Common disputes: matching undamaged adjacent slopes, code upgrades (building code may require upgrades the adjuster didn't include), and overhead & profit calculation.
- Negotiate if Necessary — If the adjuster's estimate is lower than your contractor's, submit a "supplement" with additional documentation. You have the right to use a public adjuster (typically 10% of claim) if negotiations stall.
- Approve and Schedule — Once you agree on scope and price, the carrier issues an Actual Cash Value (ACV) payment. After replacement, submit the final invoice for the Recoverable Depreciation (RCV - ACV = depreciation held back until work is complete).
📅 Roofing Season Calendar by Region
Plan your roofing project for optimal weather windows. Off-season installs may require special procedures and cost 10-20% more.
| City | Climate Zone | Roofing Season |
|---|---|---|
| Dallas TX | 2A (Hot-Humid) | March-November (peak: April-June, September-October) |
| San Antonio TX | 2A (Hot-Humid) | March-November (peak: April-June, September-October) |
| Houston TX | 2A (Hot-Humid) | Year-round (avoid peak hurricane season June-November for major projects) |
| Chicago IL | 5A (Cold-Humid) | April-October (peak: June-August). Winter installs require special adhesive and heat sources. |
| Phoenix AZ | 1B (Very Hot-Dry) | Year-round (avoid July-August peak heat for worker safety). Peak season: October-April. |
| Denver CO | 4B (Mixed-Dry) | April-October (peak: June-August). Hail damage repairs spike June-July. |
| Atlanta GA | 3A (Warm-Humid) | March-November (peak: May-July, September-October) |
Need a roofer you can trust? Spec sheets tell you what to buy. A pro tells you what it costs installed — in your city, with your building's specific requirements. See real quotes from local contractors who know this material.
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Equivalent Products & Cross-References
| Equivalent / Alternate Product | Action |
|---|---|
| Carlisle Sure-Seal EPDM 90-mil | |
| Firestone RubberGard EPDM 90-mil |
🏗️ Roofing Yield & Cost Estimator
Calculate total squares needed and estimated material cost for your commercial roofing project. All calculations run locally in your browser.
Frequently Asked Questions
What are the structural requirements for a ballasted EPDM roof?
The roof structure must support the dead load of the membrane (~0.16 psf), insulation (~0.5-1.5 psf depending on type and thickness), and ballast (10-15 psf for stone, 20-25 psf for pavers). Total additional dead load: approximately 13-20 psf. For an existing building, a structural engineer must verify the roof deck and supporting structure can carry this load. Steel roof decks may require additional reinforcement. The building must also resist the increased seismic mass — ballasted roofs can raise the building's seismic base shear by 10-20%.
How do you find a leak in a ballasted EPDM roof?
Leak location in ballasted systems is notoriously difficult. Best practice: (1) Electronic Leak Detection (ELD) — a low-voltage current is applied to the wet insulation, and a technician with a probe traces the current to the membrane breach. ELD can locate leaks within 1 inch. (2) Infrared thermography — wet insulation retains heat differently than dry insulation and is visible on IR cameras after sunset. (3) For critical facilities, consider installing an active leak monitoring grid (Electric Field Vector Mapping) under the membrane during installation — this provides continuous leak detection for the life of the roof at an additional cost of $0.50-1.00/ft².
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References & Industry Standards
- ASTM International. Standard Specifications for Single-Ply Roofing Membranes. astm.org
- FM Approvals. Factory Mutual Roofing Assembly Standards. fmapprovals.com
- UL LLC. Fire Classification of Roofing Materials. ul.com
- NRCA. The NRCA Roofing Manual. nrca.net
EPDM Membrane Specifications — Engineering Guide
EPDM (Ethylene Propylene Diene Monomer) is a synthetic rubber membrane that has been used on commercial roofs since the 1960s. It offers excellent resistance to UV radiation, ozone, and thermal cycling. Unlike TPO and PVC, EPDM is typically black, which absorbs heat — making it more suitable for cold climates where heat gain is beneficial. Major manufacturers include Firestone (RubberGard), Carlisle (Sure-Seal), and Versico.
ASTM D4637 (EPDM Spec), FM 4470, UL 790, ASTM E108
EPDM seams are bonded with adhesive or tape, not heat-welded like TPO/PVC. Seam integrity depends entirely on proper surface preparation and adhesive application. The #1 cause of EPDM roof failure is seam delamination from improper primer application or adhesive curing in high humidity.