Basic shed terminology
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Column :
The vertical structural member which supports the truss up off the ground.
Truss :
The main structural support of the roof. Frame : Combination of 2 columns and 2 truss halves.
Bay Spacing :
The distance between a pair of frames
Span :
The distance between the side walls of the shed (width).
Purlins/Girt :
A roll formed steel section that spans between the frames. This is used to screw the iron to as well as tying the frames together. Purlins are available in different shapes, thicknesses and sizes. Typically when they are on the roof they are referred to as Purlin, when they are on the wall they are referred to as Girts.
Footings :
Footings are what holds your shed down on the ground. They should be a concrete pier to which the base of each column is connected.
Mid-Spans :
A mid-span is fastened between the purlins in each bay. Its role is to add wall strength, support and stop sag in the wall girts.
Apex :
The highest point in the centre of the shed roof.
Mullion :
Like a column, but used to support a wall or door opening. Often seen in the end wall of a shed.
Wind Bracing :
Bracing in the bay of a shed (between frames). It is used to hold the building square and vertical.
Pitch :
The degree of slope on the roof.
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