Deflection - Amount a member sags or displaces under the influence of forces.
Design Loads - Dead and live loads for which a truss is designed to support.
Diagonal Bracing - Used in conjunction with lateral bracing to transfer brace forces into the supporting structure. Diagonal braces are installed in the same plane as lateral bracing but at a 45 degree angle to the lateral brace.
Direct Nail - To nail perpendicular to the member being nailed.
Drywall - Interior finish material sheet manufactured with gypsum (gypsum board).
Dual Pitch Truss - Truss that changes pitch at the top chord peak joint.
Duration of Load - Duration of stress or the time during which a load acts on a member. In wood, a design consideration for modifying allowable stresses based on the accumulated loadings anticipated in the life of a structure..
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