Walls that are constructed of concrete block that need to be covered with a roof will require the use of a ledger.
Roof truss on masonry wal.
Roof trusses attach to a ledger that is on top of a block wall.
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Steel bar joists typically use pocketed or ledger connections to concrete masonry walls.
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.
Steel framed roofs using steel bar joints are very common in commercial structures because they are capable of spanning long distances.
A ledger is a horizontal board that is attached to the top of the the wall.
Inclined steel roof truss with shs members supported on top of a masonry wall.
Have a helper hold the truss in place.
Roof to masonry wall connections despite the fact that the photo indicates every truss is strapped this strap between the top of a masonry wall and the truss is a demonstration of a poor installation.
Position the bottom horizontal member or bottom chord of the truss on the marks on each side wall.
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.
May 12 2020 roof steel truss supported on masonry wall with concrete chainage beam.
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.
Straps should never be bent sideways before attaching to the truss or rafter.
Staggered nail patterns provide greater uplift resistance.
Masonry units are cut to conform to the roof slope at the same height as the roof trusses.
The recommended methods for connecting wood frame roofs to concrete masonry walls by direct bearing connections are identical to those for wood truss connections.
A 2 in.