Larsen Truss Roof

Some builders argue that a proper larsen truss must be added onto the load bearing wall sheathing to be truly a larsen truss and not attached directly to the load bearing wall.

Larsen truss roof.

The larsen trusses get installed late in the construction schedule after the roof is on. February 20 2017. These lightweight trusses are tacked onto the sheathing after a house is framed and sheathed. Larsen trusses are non structural.

When i arrived much of the roof had been framed but i was able to climb up for a little valley framing. Ladder like trusses are installed around the exterior of the building in my case the frame and drywall sheathed and filled with insulation. A larsen truss is a system of adding large amounts of insulation to a house by putting light weight trusses around the perimeter separate from the structural parts of the building. A larsen truss is a type of lightweight non structural double stud wall assembly that allows for thicker insulation is ideal for dense packed cellulose insulation wall systems and a very high r value building envelope without many of the problems associated with double stud wall construction.

In most cases conventional 2x4 studs hold up the roof load and the 2x4s are sheathed with plywood or osb. Modified larsen truss retrofit. My modified larsen truss system requires conventional platform framing of the first floor walls second floor deck and then eastern balloon framing of the second floor bearing walls let in ledgers to support ceiling joists and rafters.