Glossary of Terms

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Glossaries

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Term Definition
Parallel chord truss

Truss with top and bottom chords with equal slopes.

Partially recessed purlin

Recessed purlin whose top edge is above the top edge of the trusses/rafters to which it is connected.

Partition

A permanent interior wall that divides a building into rooms.

Pier and beam foundation

A pier foundation that supports a grade beam.

Pier embedment depth

Vertical distance from the grade line to the bottom of a pier or embedded post.

Pier foundation

A foundation consisting of an embedded pier and all attached below-grade elements, which may include a footing, uplift resistance system, and collar.

Pitch

The angle of slope of a roof.

Pole

A round, naturally tapered, unsawn, wood post. Poles are sometimes slabbed to aid in fastening framing members.

Pole-frame building system

A post-frame building in which all posts are round poles. Commonly referred to as a pole building.

Post

A structural column. Functions as a major foundation element when it is embedded in the soil. Post-frame building posts include solid-sawn posts, structural composite lumber posts, glulam posts, mechanically-laminated lumber posts, and poles.

Post foundation

A foundation consisting of an embedded post and all attached below-grade elements, which may include a footing, uplift resistance system, and collar.

Post height

The length of the non-embedded portion of a post.

Post size and spacing

Post size and post spacing are dictated by such factors as: size of wall openings, wall heights, spacing of primary roof framing, and type and magnitude of structural loads.

Post-frame building system

A building characterized by primary structural frames of wood posts as columns and trusses or rafters as roof framing. Roof framing is attached to the posts, either directly or indirectly through girders. Posts are embedded in the soil and supported on isolated footings, or are attached to the top of piers, concrete or masonry walls, or slabs-on-grade. Secondary framing members, purlins in the roof and girts in the walls, are attached to the primary framing members to provide lateral support and to transfer sheathing loads, both in-plane and out-of-plane, to the posts and roof framing.

Primary frame

The two-dimensional interior frame that is formed by the direct attachment of a roof truss/rafter to its respective posts. Also known as a post-frame or a main frame.

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