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normally, no, if you don't want to pay extra. sometimes depends on builder.
! V# A6 E0 r% t! P) d- s( fFor some custom builders, all-screws subfloor is the standard, but if you are not sure about your builder's, put this spec. requirement down on the contract; black and white and check it out on site. DO NOT believe any verbal promises.
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( l3 H; n$ u5 M( t pdo not warry about it. almost you can not control the sub-contractor. The builder too. ' z& h8 D5 F9 @/ y 2 u& g1 |' Y Z8 ~1 a3 ^7 H6 tpay attention to your major staff.