We have put together probably one of the most comprehensive pole building glossaries found on the internet today. And if you are like most people, if you can't see it, you still don't understand it very well.

If there is any pole building term you still don't understand, or one not yet listed here, please use the Contact Us page to email us. We will be glad to send drawings or pictures for illustration.

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Rafter:	A sloping roof framing member.
Rake:	The part of a roof projecting over the endwalls. In the absence of an endwall overhang, the rake is the line along the endwall formed by the intersection of the wall and roof planes.
Rake Trim:	A flashing designed to close the opening between the roof and endwall panels.
Reactions:	The resisting forces at the column bases of a frame, holding the frame in equilibrium under a given loading condition.
Registered Design Professional:	An individual who is registered or licensed to practice their respective design profession as defined by the statutory requirements of the professional registration laws of the state or jurisdiction in which the project is to be constructed. Typically an architect or engineer.
Residential Overhead Door (or Overhead Door):	Consists normally of a combination 21" or 24" height raised steel panels, the width of the door opening.
Retention:	The amount of chemical preservative added to wood to prevent decay, expressed in weight of preservative per cubic foot of material. A minimum .60 pcf retention with CCA or ACZA is required for structural in-ground use.
Ridge (or Peak):	The highest point of the roof, which describes a horizontal line running the length of the building.
Ridge Cap:	A transition of the roofing materials along the ridge of a roof.
Ring Shank Nail (or Threaded Nail):	A type of nail with either annual or helical threads in the shank. Generally made from hardened steel and have smaller diameters than common nails of similar length.
Roof Live Load:	Those loads induced by the use and occupancy of the building, not including wind, snow, seismic or dead loads.
Roof Overhang:	The portion of the roof extending beyond the sidewalls and/or endwalls of a building.
Roof Snow Load:	Vertical load from weight of snow applied to the horizontal projection of the building roof. Influenced by a number of factors besides ground snow load, including roof slope, temperature and coefficient of friction and wind exposure.
Roof Truss:	An engineered building component functioning as a structural roof support member. Made up of three or more members, with each member designed to carry a tension or compression force. Assembled from wood members, metal connector plates and/or other mechanical fasteners, designed to carry the roof truss weight as well as superimposed loads. The truss members form a semi-rigid structural framework and are assembled so the members form triangles. Attached to the wall columns, they compose the post frames of a post frame building, are the primary structural elements and part of the windforce-resisting system.