Vinyl Siding, Vinyl Siding Installation    

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Double 4 (D4) Profile:   Two 4-inch wide horizontal traditional planks per single panel of siding.   

Double 5 (D5) Profile:  Two 5-inch wide horizontal traditional planks per single panel of siding.

Detachment Separation:  The separation of the siding material veneer from its attachment to the structure.

Double Channel Lineal:  A siding accessory that is designed to connect two soffit panels.

Double Course:  When an under layer of shingles or shakes is covered completely by an overlaying course of siding.

Double Wall Siding:  Siding in which sheathing is installed and is then covered by exterior siding.

Drip Cap or Head Flashing:  An accessory installed with vertical siding to ensure that water drips away from panels and does not infiltrate them; it is also used as a vertical base.   

Dutch Lap:  A more decorative variation on the clapboard style where the face (or width) of the board is beveled for added dimension and shadow lines.