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Analysis 1. Initial Cost of each Alternative	IronSentry	New Roof Now	Acrylic	Do Nothing Now
Roofing Alternatives for a 20,000 square foot 25 Year Old Galvanized Steel Roof
WHAT ARE THE INITIAL COSTS OF THE VARIOUS ALTERNATIVES?
HOW MANY SQUARE FEET?	20,000	20,000	20,000	20,000
PRICE PER SQUARE FOOT	$2.25	$6.50	$2.00	$0.00
INITIAL OUT OF POCKET COST OF EACH OPTION (Present Value)	$45,000	$130,000	$40,000	$0
Tax effect of expensing repairs vs. capitalizing new roof @ 35% tax rate	($15,750)	($1,300)	($14,000)	$0
AFTER TAX FIRST YEAR NET CASH FLOW OF EACH ALTERNATIVE:	$29,250	$128,700	$26,000	$0

WHAT ARE THE LIFE CYCLE COSTS OF THE VARIOUS ALTERNATIVES?
Analysis 2. Net Present Value over 30 years of each Alternative
Annual maintenance cost per square foot (last five years of New Roof)	$0.00	$0.25	$0.00	$0.25
NPV Discount Rate	6%	6%	6%	6%
Iron Sentry will last 30 years with 2 recoats. 1st recoat NPV	$12,564
Iron Sentry will last 30 years with 2 recoats. 2nd recoat NPV	$7,016
New Roof will require annual maintenance in its last five years NPV		$5,035
Acrylic will require a 40% dearer new roof after 10 years. NPV			$101,628
Do Nothing will require annual maintenance in first five years NPV				$22,250
Do Nothing will require a 20% dearer new roof in five years NPV				$116,572

Net Present Value of Additional costs of this option @ Discount Rate	$19,579	$5,035	$101,628	$138,822

Pre-Tax Net Present Value of 30 year total cost of this option	$64,579	$135,035	$141,628	$138,822
NPV of Tax Effect of Expense for IS vs. Capitalize for New Roofs @35% Tax	($22,603)	($16,914)	($27,222)	($15,167)

NPV of 30 year total cost after Tax for each Alternative	$41,977	$118,122	$114,406	$123,656

Extra NPV Cost to You of Not Choosing the Iron Sentry Solution Now	$0	$76,145	$72,429	$81,679

WHAT ARE THE NORMALIZED COSTS OF THE VARIOUS ALTERNATIVES?
Analysis 3. Effective Cost Normalization
This analysis subjects Alternatives to the same normalization formula used by public works officials to judge between different materials.	$62,926	$177,074	$171,503	$185,370

Extra Normalized Cost to You of Not Choosing the Iron Sentry Solution Now	$0	$114,147	$108,577	$122,443

This page uses public works least cost analysis and discounted cash flow techniques. For a detailed explanation with references see "A Short Note on Abrasion Resistance". Other good general references are Financial Analysis for Commercial Investment. CCIM Institute, Chicago: 2005 and Crane, D.B.; Capital Investment Analysis; Case Study 9-204-140. Harvard Business School, Boston: 2004.

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