Elastomeric (acrylic) roof coatings are highly reflective, flexible, and affordable. They are widely used to restore aging metal roofs, extending their lifespan by 10+ years while drastically reducing building cooling costs. Use this estimator to calculate how much elastomeric material you need to properly coat your roof.
Check manufacturer specs. Silicone is often 1.5 - 2.0 gal/sq.
*This assumes a relatively smooth surface. Highly textured surfaces (like built-up gravel or corrugated metal) increase surface area and may require up to 20% more coating material.
Approx 9 pails (5 gal each) for 2 coats.
Measure or confirm the required geometric inputs before calculation.
Calculate the plan/base value from your measured inputs.
Use rise/run geometry or form-specific factors to convert to true sloped scope.
Translate outputs into practical units such as squares, pieces, or roll counts.
Verify complex intersections, accessories, and local requirements before procurement.
For complex roofs, run plane-by-plane geometry and accessory checks before final material ordering.
Most ordering mistakes happen when assumptions are mixed across units, pitch, and coverage rules. Using Elastomeric Membrane Roof Estimator early helps align scope, quantity, and labor planning before supplier pricing or installer scheduling. This reduces reorders, avoids under-counting, and improves quote consistency.
Start with verified dimensions, run conservative waste assumptions, then compare output against product data sheets and field conditions. For cross-checks, pair this page with Roof coating calculator and Flat roof drainage calculator.
Treat calculator output as a controlled estimate, then validate accessories, overlaps, and edge details separately. Final checks are stronger when you review assumptions with TPO roofing estimator before submitting purchase orders.
Elastomeric (acrylic) is water-based, cheaper, and easy to clean up, but it fails under standing water. Silicone is solvent-based, more expensive, and completely immune to standing water. For better estimating accuracy, cross-check roll coverage, overlap width, and edge detailing with your project notes, then confirm drainage falls before final ordering. This keeps your system specification aligned with real site conditions.
When applied at the correct thickness on a properly prepared surface with positive drainage, an elastomeric coating will last 10 to 15 years before needing a recoat. For better estimating accuracy, cross-check roll coverage, overlap width, and edge detailing with your project notes, then confirm drainage falls before final ordering. This keeps your system specification aligned with real site conditions.
Usually, yes. If applying over EPDM rubber, rust, or asphaltic surfaces, a specialized primer is required to ensure adhesion and prevent asphalt oils from bleeding through the white coating. For better estimating accuracy, cross-check roll coverage, overlap width, and edge detailing with your project notes, then confirm drainage falls before final ordering. This keeps your system specification aligned with real.
Planning. Use outputs for budgeting and early scope, then verify dimensions and specifications before procurement. For better estimating accuracy, cross-check roll coverage, overlap width, and edge detailing with your project notes, then confirm drainage falls before final ordering. This keeps your system specification aligned with real site conditions and reduces costly quantity revisions.
Accuracy depends on input quality. Better field measurements and realistic assumptions produce better results. For better estimating accuracy, cross-check roll coverage, overlap width, and edge detailing with your project notes, then confirm drainage falls before final ordering. This keeps your system specification aligned with real site conditions and reduces costly quantity revisions.
Yes. Most roofing workflows include waste to cover cuts, breakage, and layout inefficiencies. For better estimating accuracy, cross-check roll coverage, overlap width, and edge detailing with your project notes, then confirm drainage falls before final ordering. This keeps your system specification aligned with real site conditions and reduces costly quantity revisions.
Usually no. Most projects need supporting checks for pitch, area, accessories, and costs. For better estimating accuracy, cross-check roll coverage, overlap width, and edge detailing with your project notes, then confirm drainage falls before final ordering. This keeps your system specification aligned with real site conditions and reduces costly quantity revisions.
Validate dimensions, pitch, overlaps, accessory counts, and local installation requirements. For better estimating accuracy, cross-check roll coverage, overlap width, and edge detailing with your project notes, then confirm drainage falls before final ordering. This keeps your system specification aligned with real site conditions and reduces costly quantity revisions. Recheck dimensions, product coverage, and install requirements before purchase.