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What is the relative cost difference for approximatety 1000sf, no penetrations. Application is over an existing epdm adhered roof.
 

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EPDM membrane will be cheaper just for the membrane. However tpo doesn't require primers and seam tape like epdm so at the end of the job it's similiar in cost. Assuming similiar mil thickness for both membranes and similiar application methods. Learn more about your Flat Roofing Options This'll answer alot (except price).
 
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