Most homeowners picture a roof replacement as a multi day disruption, but a standard residential replacement is typically completed in a single day. That single day is dense with sequenced work though, not a quick swap of old shingles for new ones. Crews arrive early with a dumpster or trailer staged, and tear off begins by removing old material down to the decking, using magnetic rollers afterward to collect stray nails from the yard and driveway. Every section of exposed decking gets inspected before anything new goes down, and any soft or delaminated sections are replaced on the spot rather than covered over. From there, ice and water shield goes in at the eaves and valleys, synthetic underlayment covers the rest of the field, drip edge and flashing get installed at every transition point, and finally the new shingles go down according to the manufacturer's nailing pattern. Weather windows matter less than homeowners often assume, since the compressed single day timeline means most jobs proceed on schedule barring genuinely severe conditions.