found this website while trying to do some research on internet maybe someone out there can answer I am watching construction workers work on my elderly neighbors house we recently in our area ( Western PA, Allegheny county ) had a severe storm with much hail damage to the area , we all had aluminum siding damage and most homes are replacing that now with vinyl siding , my question is under my new siding was placed a house wrap before the siding was put up , BUT seeing on my neighbor's house they pulled off the old siding and the silver paper ( sorry dont know the technical terminology) came off with it . they are putting back up vinyl siding with no type of house wrap underneath it , these are old homes ( probably close to hundred years old since they were built originally) My question is , IS house wrap required under the vinyl siding by code regulations , installation recommendations ? I just dont want this senior to get ripped off and have to face future damage by not having the work completed correctly as every other house i have seen being repaired since the storm with new siding is wrapped underneath the new vinyl siding