Estimate Only — Not for Construction Documents
The ERS Roof Calculator is a budgeting and purchasing estimation tool only. It does not produce engineered designs, construction documents, or certified specifications.
The calculations, material quantities, and assembly configurations provided by this tool are approximate estimates intended solely for budgeting and purchasing assistance. They do not constitute engineering advice, professional design services, or construction specifications. The tool does not replace the judgment of a licensed professional engineer (PE) or registered architect (RA).
All material quantities, fastener patterns, wind uplift ratings, insulation specifications, and assembly configurations generated by this calculator must be independently verified by a licensed professional engineer or registered architect before being used in any construction project. Local building codes, site-specific conditions, and structural requirements may differ from the general estimates provided.
References to FM Global ratings (e.g., FM 1-90, FM 1-120) and fastener density patterns are provided for estimation guidance only. This tool does not verify, certify, or guarantee that any assembly configuration meets FM Approvals, UL ratings, or any other certification standard. Users must verify assembly approvals through FM RoofNav, UL Product iQ, or the relevant manufacturer.
Essential Roofing Supply (ERS) makes no warranties, express or implied, regarding the accuracy, completeness, or fitness for any particular purpose of the estimates provided by this calculator. ERS shall not be liable for any direct, indirect, incidental, consequential, or special damages arising from the use of or reliance on this tool, including but not limited to material shortages, overages, assembly failures, project delays, or non-compliance with building codes.
This calculator may contain errors in its calculations, data sources, or logic. Material quantities are approximations subject to waste factors, cutting patterns, and site-specific conditions that cannot be fully accounted for in a general-purpose estimating tool. ERS makes no guarantees of accuracy and recommends independent verification of all outputs.
Material estimates for products not sold by ERS (such as membrane, insulation, cover boards, and adhesives) are approximate reference figures provided for project planning convenience only. ERS does not warrant the accuracy of these estimates and is not responsible for purchasing decisions based on them.
Prices shown are subject to change without notice. "Industry Average" pricing comparisons are based on ERS market research and may not reflect actual prices available to you from other suppliers. Live pricing and inventory availability are provided by Shopify and may differ at time of checkout.
By using this calculator, you acknowledge that you understand these limitations and agree to use the tool at your own risk. You agree to hold Essential Roofing Supply harmless from any claims, damages, or losses arising from the use of this calculator or reliance on its outputs.
Essential Roofing Supply — Wall Township, NJ
Last updated: March 2026