A ledger is a horizontal board that is attached to the top of the the wall.
Roof truss blocks.
Walls that are constructed of concrete block that need to be covered with a roof will require the use of a ledger.
For trusses with heel heights less than 15 this blocking can be made of solid sawn dimensional lumber as shown in figure 1a.
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Includes the following cad symbols.
The ledger is needed to properly attach the perpendicular roof trusses to the top of the structure.
For roofs the truss is being used to frame the actual shape itself.
Roof trusses attach to a ledger that is on top of a block wall.
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The truss is commonly pre fabricated from wood and is what holds up the roof.
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