Exterior Coatings Estimating

All coverages given in data sheets are without losses and represent material actually on the surface. Additions must be made by the estimator for application conditions and the applicator.

For estimating purposes, 20% excess will generally cover normal losses for heavy mastic coatings. Lighter coatings, when applied by air spray, can require 30% excess.

NOTE: Trowel applications are subject to operator technique but are not significantly changed by wind. Airless spray applications are subject to applicator technique, scaffolding arrangement and, somewhat, by wind.

COVERAGE CAN BE EXTREMELY VARIABLE AND THIS IS ONLY A GUIDE. CONTRACTOR'S EXPERIENCE WITH THEIR PERSONNEL SHOULD BE USED WHENEVER AVAILABLE.

Calculations:
Break units to be coated into its elements: sidewalls, roof, heads, and or bottom, etc., spherical area, and legs. Piping can be treated as a cylinder or area/lineal foot taken from various charts.

Formulae for area of various shapes are given in Table C1. Be sure to include insulation thickness in square footage calculations. For tank sidewalls, spheres and piping; the diameter will be the vessel diameter plus twice the insulation thickness.

Once the total area is calculated, divide by 100 and multiply by the coverage rate/100 sq. ft. (normally 6 U.S. gallons; check Manufacturers Data Sheet) to get gallons without losses. Add to this loss allowance from experience or by 1.2 for a 20% loss.

Related Links:

Estimating Coating - Two Examples
Estimating Coatings -Table C1 - Surface Area Formulae for Various Shapes
Estimating Coatings -Table C2 - Coatings Coverage Chart
Estimating Coatings -Table C3 - Standard Sphere Dimensions
Coating Colors as "Signals" - Suggested National Standards
C.A.S. Index - Several Related Tables

EXTOL INSULATION SYSTEMS: COMPLETE PRODUCT LINE    COMPOSITE INSULATIONS    CONTOURED HEAD SYSTEMS    EXCEL-LAP SYSTEMS    ISOWRAP® PRECISION CUT    TRACED LINE SYSTEMS    VALVE & JACKET SYSTEMS

DATA SECTIONS: DESIGN & INSTALLATION TIPS ESTIMATING TIPS / & CHARTS EXTOL SYSTEMS DATA MSDS LISTED BY MANUFACTURER MSDS LISTED BY PRODUCT TYPE PRODUCT DATA SHEETS PUBLICATIONS & ARTICLES HELPFUL SALES/TRAVEL INFO WBE CERTIFICATIONS

BACK TO MAIN OBTAIN A QUOTE SURPLUS MATERIAL PLACE AN ORDER EMPLOYMENT OPPORTUNITIES PASSKEY SECTION: WAIVER / PASSKEY REQUEST INSULATION SPECIFICATIONS DETAILED DRAWINGS_COLD/HOT