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Barn Plans from 1919 - Continued

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The Typical Truss

THE illustration on this page shows a STAR Plank Truss. This truss is continuous from foundation to ridge. The construction is not broken at the mow level and it is therefore stronger and gives a better anchorage to the lower part of the barn frame.

Stresses are carried directly to the foundation wall.

The 2 in. x 8 in. studs are continuous from sill to plate. A three member truss chord ties the trusses together at the mow floor level.

The purlin post built up of 2 in. x 10 in. planks is thoroughly braced, securely bolted and spiked to the truss chord at the mow floor level.

The purlins consist of two 2 in. x 10 in., blocked apart and run the full length of barn. A 2 in. x 4 in. ledger is added forming a seat for the upper run of rafters.

 

The truss principal extends from below the plate to the ridge.

Two 2 in. x 6 in. struts run from purlin to truss principal. Purlin is braced to truss principal by 45 degree angle braces.

The ridge is 2 in. x 10 in. A 2 in. x 8 in. collar beam ties the trusses together at the ridge and supports the hay track.

The most convenient way is to cut lumber for all the trusses, so that all cuts will be uniform and then build and erect the trusses one at a time.

The foot of the truss is blocked at the sill, and raised with block and tackle used in connection with a gin pole. After the first two trusses are raised the two upper plates, and the two lower plates are put in. Then the side framing, including the girts around the building, are installed (side framing shown in detail on page 150). When all the trusses are up and braced as shown by the details on the following pages, the two purlins are hoisted to ‘ position by block and tackle, and the ridge pole is added. The rafters, look-outs, and rafter ends are the finishing touches to the frame.