Abstract: Elongate extruded sections of vinyl siding, having a top edge portion, which is intended to be hidden in use behind the bottom edge of an immediately higher section of siding, wherein the top edge portion is slit crosswise at a plurality of spaced apart locations, permitting freer expansion and contraction of the exposed portion of the siding with changes in temperature.

Abstract: A casing trim, and the combination therewith of a flat vinyl strip, and the method of concealing building wooden casings and the like, wherein the casing trim is nailed to the edge portion of a casing, with one flange of the casing trim extending over an edge of the casing, and the perpendicularly directed face portion has a channel which receives and retains an edge of the flat vinyl strip. In an added embodiment, the flat vinyl strip is replaced by a wide cap having a rearwardly extending flange, for engagement in a forwardly extending channel of a receiver, all of which are disposed around the edge of adjacent vinyl siding.

Abstract: A casing trim, and the combination therewith of a flat vinyl strip, and the method of concealing building wooden casings and the like, wherein the casing trim is nailed to the edge portion of a casing, with one flange of the casing trim extending over an edge of the casing, and the perpendicularly directed face portion has a channel which receives and retains an edge of the flat vinyl strip.

Abstract: A gypsum wallboard with electrical heating wire disposed in grooves arranged to minimize tendencies for the board to crack when lifted by the two opposite board ends.