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    oilibomjg's Avatar
    oilibomjg Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Jun 9, 2012, 07:13 AM
    Top brands in roofing shingles
    Would you recommend installing new shingles on top of the old existing shingles on a house? What are the pro's and con's in addition to being cheaper...
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
    Uber Member
    		  
    #2

    Jun 9, 2012, 09:15 AM
    Cheaper labor is the only pro. Can your roof support another layer? If roof is truss built with 24" OC and OSB, I wouldn't do it. Stick built with 16" OC should be OK. 20 squares with 220# roofing is over 2 TONS of additional weight.
    creahands's Avatar
    creahands Posts: 2,854, Reputation: 195
    Ultra Member
    		  
    #3

    Jun 9, 2012, 10:12 AM
    Depending on type of shingles, no more then 3 layers can be put on a stick built roof and no more then 2 on a truss roof.

    Chuck
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