[heading-style-h3]How to Compare Commercial Roofing Bids Apples to Apples[heading-style-h3]

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[heading-style-h4]Start with one written basis of comparison[heading-style-h4]

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Give bidders the same known roof information: measured areas, roof plans when available, leak history, access limits, operating hours, known deck concerns, and the decision being considered. If one bidder is pricing repair and another is pricing replacement, the totals should not be placed in the same column without explaining that difference.

A pre-bid inspection or owner scope can reduce ambiguity, but it cannot eliminate hidden conditions. Every proposal should state how concealed wet insulation, deteriorated deck, or undocumented roof layers will be handled.

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[heading-style-h4]Compare the roof system, not just the membrane name[heading-style-h4]

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Membrane type and nominal thickness are only part of the assembly. Compare substrate preparation, insulation type and thickness, cover board, attachment method, perimeter enhancement, flashing details, penetration work, edge metal, and drainage corrections.

A proposal that includes a complete compatible assembly may cost more than one that names only the top membrane. Ask each bidder to show the assembly from deck to finished surface.

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[heading-style-h4]Make allowances and exclusions visible[heading-style-h4]

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An allowance is an estimated amount for work that cannot yet be confirmed. An exclusion means the work is not included. Those are not the same. Ask for unit prices or a defined change-order method for wet insulation, damaged deck, additional penetrations, and other common concealed conditions.

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[heading-style-h4]Compare disruption and closeout requirements[heading-style-h4]

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Staging, loading, odors, noise, tenant access, interior protection, daily cleanup, and weather shutdown procedures can affect the building even when the roof system is similar. The proposal should identify who coordinates these items and how changes are communicated.

Closeout should also be priced and defined. Confirm what photos, warranties, product data, inspection records, maintenance requirements, and final punch-list documents will be delivered.

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[heading-style-h4]Commercial roofing bid comparison table[heading-style-h4]

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