Vinyl Siding, Vinyl Siding Installation    

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J

J-Blocks:  Mounting accessories for fixtures, water spigots and lights for a finished trimmed look.

J-Channel:  An accessory of vinyl or aluminum siding systems which has a curved channel that the planks fit into.  Used around windows, doors and other fixtures to make a weather tight seal.   Deeper J-channels are for insulated siding, and narrower J-channels for non-insulated siding.