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Methods, systems, and devices for installing barriers in openings of gaps in or between structures such as walls, ceilings, and floors are described herein. At least one barrier molding bag is positioned in the hole or gap, and a flowable firestop material that is preferably operative to cure or har

Methods, systems, and devices for installing barriers in openings of gaps in or between structures such as walls, ceilings, and floors are described herein. At least one barrier molding bag is positioned in the hole or gap, and a flowable firestop material that is preferably operative to cure or harden, such as a hydratable cementitious slurry, is introduced into the bag to create a barrier in the hole or gap.

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We claim: 1. A device for making a barrier against spread of fire across an opening at the top of an interior wall of a building, comprising, in combination; (i) a longitudinally extending track having a generally elongate body and an "H"-shaped cross-sectional profile, said track further having an

We claim: 1. A device for making a barrier against spread of fire across an opening at the top of an interior wall of a building, comprising, in combination; (i) a longitudinally extending track having a generally elongate body and an "H"-shaped cross-sectional profile, said track further having an upwardly extending pair of flanges and a downwardly extending pair of flanges defining, respectively, upper and lower longitudinally extending channels, said track further having a longitudinally extending separating wall member separating said upper and lower channels, said wall member having a plurality of openings located periodically along its longitudinal extension; and (ii) a molding barrier bag operative to be filled with a firestop material and positioned in and along the longitudinal extent of said upper channel, said bag having crinkles or pleats operative as compartments to permit expansion of said bag when filled with firestop material and further having a plurality of fitments extending through said openings of said wall member operative to admit firestop material to the interior of said bag. 2. The device of claim 1 wherein said track is formed from one sheet of metal. 3. The device of claim 1 wherein said track has a plurality of additional openings located periodically along the length of said elongate body, proximate to said upwardly extending flanges, to permit visual inspection of said molding barrier bag when said bag is filled with firestop material. 4. The device of claim 1 wherein said track is formed from one sheet of metal, said track comprising an H-shaped cross-sectional profile with a pair of flanges for attaching said device to a building surface, said flanges being connected to outer vertical walls of said H-shaped profile, which outer vertical walls in turn are connected respectively to inner lower vertical walls which in turn are connected to each other by a connecting wall member that is perpendicular with respect to said outer and inner vertical walls, thereby generally defining an "H"-shaped cross-sectional profile having said flanges. 5. The device of claim 1 wherein said fitments have means to secure said bag to said separating wall member. 6. The device of claim 5 wherein, said means comprise one or more detents formed in said fitments which engage said wall member when said fitments are inserted in said opening and thereby prevent said fitments from being removed from said openings in said wall member. 7. The device of claim 1 wherein said fitments have one-way valve means positioned at the entrance of said fitments to said bag, said valve means allowing firestop material to enter said bag but acting to prevent said material from flowing back out of said bag. 8. A method for making a barrier against the spread of fire across a surface of a building comprising, in combination: (i) a longitudinally extending track having a generally elongate body and an "H"-shaped cross-section profile, said track further having an upwardly extending pair of flanges and a downwardly extending pair of flanges defining, respectively, upper and lower longitudinally extending channels, said track further having a longitudinally extending separating wall member separating said upper and lower channels, said wall member having a plurality of openings located periodically along its longitudinal extension; and (ii) a molding barrier bag operative to be filled with a firestop material and positioned in and along the longitudinal extent of said upper channel, said bag having crinkles or pleats operative as compartments to permit expansion of said bag when filled with firestop material and further having a plurality of fitments extending through said openings of said wall member operative to admit firestop material to the interior of said bag; wherein said longitudinally extending track is attached to a building surface in a manner such that said upper channel of said track containing said molding barrier bag is positioned towards said building surface, and thereafter introducing firestop material into said bag through said fitments to expand said bag and provide said barrier. 9. The method of claim 8 further comprising assembling wall studs connected to said track. 10. The method of claim 9 further comprising attaching at least one wall board to said wall studs, whereby a portion of said at least one wall board is allowed to move with respect to said molding barrier bag retained within said track. 11. The method of claim 8 wherein said track has additionally a pair of flanges for attaching said H-shaped cross-sectional profile against the building surface, and a plurality of wall studs is assembled beneath and connected to said H-shaped profile, and at least one wall board is attached to some of said wall studs and located alongside said track, said wall board being operative to move with thermal cycling with respect to portions of said track.