I have not used the liberty system but we have installed similar. Myself if i was tearing off an old SBS roof or a low slope roof that someone tried to shingle on an 18 sq house i would likely send 6 men there and expect them to complete it in a day. if you say an average of $300.00 per guy x 6 = $1800.00 then you wouldnt be too far off if you paid a sub $100.00 a square. We pay our shinglers here about $70.00 for a 1 layer off into a bin fyi
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