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Damper
A baffle used to open or close the throat of ventilators.

 

Dead Load
The weight of the Building System construction consisting of members such as framing and covering.

 

Dealer
A party who, as a routine part of his business, buys Metal Building systems from a manufacturer for the purpose of resale.
See also "Builder".

 

Deflection
The displacement of a structural member relative to its supports due to applied loads. Deflection should not be confused with "Drift".

 

Design Loads
The loads expressly specified in the contract documents which the Metal Building Systems is designed to safely resist.

 

Design Professional
The Architect or Engineer responsible for the design of a Construction Project.

 

Diagonal Bracing
Rods, angles or cables used in the plane of the roof and walls to transfer loads, such as wind, seismic and crane thrusts to the foundation.
See also Bracing.

 

Diaphragm Action
The resistance to racking generally offered by the panels, fasteners and members to which they are attached.

 

Direct Tension Indicator
A washer with dimples which flatten when the high strength bolt is tightened. The bolt tension can then be determined by the use of feeler gages to determine the gap between the washer and the bolt head.
See also Load Indicating Washers.

 

Door Guide
An angle or channel used to stabilize or keep plumb a sliding or rolling door during its operation.

 

Downspout
A conduit used to carry water from the gutter of a building.

 

Drift (Sidesway)
Horizontal displacement at the top of a vertical element due to lateral loads.

Drift should not be confused with "Deflection".

 

Drift (Snow)
The snow accumulation at a height discontinuity.

 

Drift Pin
A tapered pin used during erection to align holes in steel members to be connected by bolting.

 

 
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