Roof Trusses On Cmu Wall

The girder which by definition supports the inboard end of other framing members can be anywhere from 3 to 11 feet back from the corner.

Roof trusses on cmu wall.

Connecting a roof system to a concrete masonry wall is similar to connecting a floor system to a concrete masonry foundation wall in that most roof systems bear directly on the walls below. Saved by consensus realty solutions inc. In older homes the connection may be made using 2 or 6 16d nails in a toe nail configuration. Floor and roof systems for use with loadbearing structural concrete masonry walls serve three primary functions.

The ledger is needed to properly attach the perpendicular roof trusses to the top of the structure. 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. A 2 in. We always spec and typically see from all truss suppliers a metal plate shop applied on the heel of the truss to provide a moisture barrier between the concrete cmu wall and the wood truss.

They transmit the vertical dead load and live load to the bearing walls. The trusses or rafters are then connected to this plate. This is standard here in florida. 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.

Masonry units are cut to conform to the roof slope at the same height as the roof trusses. A ledger is a horizontal board that is attached to the top of the the wall. For hip roofs the code specifies that hip and girder rafters or trusses be connected to exterior wall plates. They function as diaphragms transmitting lateral wind and seismic loading through the walls to the foundation.

People also love these ideas. Simpson also makes some plates that can be applied in the field prior to erecting the truss. Roof trusses attach to a ledger that is on top of a block wall. Cmu wall to engineered roof truss.

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