May 12 2020 roof steel truss supported on masonry wall with concrete chainage beam.
Roof truss on masonry wal.
Proprietary systems that use concrete masonry units as a filler between the steel joists are also available.
70 mm deep notch is cut into the tops of the concrete masonry webs to allow placement of reinforcement that is continuous with the bond beam reinforcement in the side walls.
Masonry units are cut to conform to the roof slope at the same height as the roof trusses.
Refer to figure 3 1.
Standard dimensional lumber used for residential roof systems is most often nominal 2 x 6s 2 x 8s 2 x 10s depending on span and loading conditions.
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Staggered nail patterns provide greater uplift resistance.
Roof trusses attach to a ledger that is on top of a block wall.
Step 2 hold a 16d common nail at a 45 degree angle approximately two inches up from the bottom of the bottom chord of the truss.
Walls that are constructed of concrete block that need to be covered with a roof will require the use of a ledger.
A ledger is a horizontal board that is attached to the top of the the wall.
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Inclined steel roof truss with shs members supported on top of a masonry wall.
Have a helper hold the truss in place.
Embedded truss anchors and truss seat snap in an engineered method to attach roof trusses to concrete and masonry walls to resist uplift and lateral loads.
A 2 in.
Steel bar joists typically use pocketed or ledger connections to concrete masonry walls.
Steel framed roofs using steel bar joints are very common in commercial structures because they are capable of spanning long distances.
Straps should never be bent sideways before attaching to the truss or rafter.
Position the bottom horizontal member or bottom chord of the truss on the marks on each side wall.