Roof Truss Ledger On Concrete Tilt Up Walls

With the tilt up method concrete elements walls columns structural supports etc are formed horizontally on a.

Roof truss ledger on concrete tilt up walls.

Wood roof truss or rafter direct bearing connection. The most common tilt up procedure is to erect exterior walls first followed by the roof framing system. Precast concrete walls however tilt up is the preferred and generally accepted term. Tilt up tilt slab or tilt wall is a type of building and a construction technique using concrete though it is a cost effective technique with a shorter completion time poor performance in earthquakes has mandated significant seismic retrofit requirements in older buildings.

A ledger is a horizontal board that is attached to the top of the the wall. The very nature of a tilt up building or any rigid wall flexible diaphragm structure is the interaction between the walls the roof structure and the floor or foundation. There is about a 12 curb with a 2x10 top plate. What is the best way to fasten the trusses to the existing wall.

The owner is looking to install pre engineered roof trusses with a 5 12 pitch as the the existing roof is leaking. This one two punch delivers new buildings quickly and economically which might explain why more than 650 million square feet of tilt up buildings go up every year. Non load bearing tilt up wall panels are used to enclose a building frame and also may act as a shear wall. Connecting wood roof trusses to concrete masonry walls by using direct bearing connections.

Cast in place connections p r ovide a strong continuous wall for shear resistance and re q u i r e the least amount of waterproofing. Fastening to masonry walls. Anchor a ledger to a masonry wall with expanding anchor bolts begin by marking a line across the wall for the ledger s top edge. Flush tilt up walls to achieve a flush tilt up wall and m i n i m i z e the joints panels extend over and hide the concrete or steel c o l u m n s.

The building has concrete blocks walls and a flat roof. Walls that are constructed of concrete block that need to be covered with a roof will require the use of a ledger. In high wind i e greater than 110 mph three second gust or high seismic areas i e seismic design category d an extra metal connector is often necessary. Drill holes for the expanding anchors every 16 inches or as specified by local codes insert the anchors hold the ledger in place and tap it with a hammer to indent the anchor locations on its back face.

Lifting panels is always the most exciting time on a tilt up job but what comes after lifting is perhaps even more important to the proper performance of the structure. They are connected to the columns with rebars or weld plates and sometimes are bolted or welded to the roof. Aci 551r 92 describes tilt up as the tech nique of site casting wall panels on a horizon. Fi g u re 4 shows four design va ri a t i o n s.