Connecting wood roof trusses to concrete masonry walls by using direct bearing connections.
Roof trusses on cmu wall.
Cmu wall to engineered roof truss.
Wood roof truss or rafter direct bearing connection.
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This is the distance of the bottom chord of the truss from outside overhang of bearing wall to outside of the other bearing wall.
The ledger is needed to properly attach the perpendicular roof trusses to the top of the structure.
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.
A ledger is a horizontal board that is attached to the top of the the wall.
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The required anchor load capacity depends on the design wind speed as well as the roof truss span.
Roof and wall sheathing gravity and wind loads floor diaphragms and shear walls in plane lateral overturninand g loads 6 notes.
The span in short is the length of the bottom 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.
For wood design chapters 5 6 and 7 use asd.
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Roof truss design roof trusses roof plan concrete wall architecture details beams it cast construction attic ideas.
Factors that affect truss pricing and cost.
Some spans have a lower rate per foot than others.
In older houses with masonry walls it is common to find a 2x8 lumber plate that is bolted or strapped flat like a plate to the top of the masonry wall.
The trusses or rafters are then connected to this plate.
New florida codes compel contractors to upgrade the roof wall connections on qualifying older homes when replacing the roof covering.
How to inspect the connections that tie existing rafters or trusses to the wall plate to determine whether retrofitting is needed.
In this article richard reynolds who helped write the new code language outlines the steps involved.
And if the home does need a.
Concrete design and the asd method for masonry design.
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In older homes the connection may be made using 2 or 6 16d nails in a toe nail configuration.