Web or vapor retarder with tie-strap

A roof structure comprising:

• a plurality of parallel, spaced-apart purlins, wherein bays are defined between each successive pair of said purlins;
• a vapor retarder system comprising:
• a vapor retarder sheet draped over a plurality of said purlins so as to span multiple bays, said vapor retarder sheet comprising a tie-strap located adjacent an inner surface of said sheet, said tie-strap connected to said sheet at multiple connection locations that are spaced from each other along a length of the tie-strap, wherein the sheet comprises drape regions that are disconnected from the tie-strap between successive connection locations, wherein said tie-strap is extended so that said connection locations are located adjacent respective ones of said purlins and said drape regions are located in respective bays between successive ones of said purlins.

A fall-protection system comprising:

• a fall-protection net or sheet;
• at least one tie-strap located adjacent an inner surface of said fall-protection net or sheet, said tie-strap extending across a width of said net or sheet and connected thereto at multiple connection locations that are spaced from each other along a length of the tie-strap, wherein the net or sheet comprises drape regions where the net or sheet is disconnected from the tie-strap between successive connection locations.