fig2 a the strip 10 is dimensioned for insertion between the corner frame 30 and the vinyl siding panels 32 35 such that the bottom surface of each 37 rest upon the upwardly angled ledges 14 of the strip in an original installation the vapor barrier strip may be positioned in place and the corner frame 30 thereafter secured over it by nailing for existing installations the corner frame 30 can simply be pried somewhat rearwardly from its nail securements and the vapor barrier strip then force fitted into place to be followed by simply pressing the cover frame 30 back to its original position alternatively where space between the vinyl siding panels and the cover frame 30 already exists it becomes but simple manner of forcing the barrier into position the same situation will be understood to present itself in the arrangement of fig2 b where a corner installation of vinyl siding exists at the home installation the strips could then be squeezed into position at the opposite side locations of the cover frame 40 where they abut with the vinyl siding panels 42 45 as with fig2 a the moisture and vapor barrier strips could be installed as part of an initial siding installation or pressed between the cover frame and panel piece of those already in place in the configuration of fig2 c where individual vinyl siding panels in a given level are to be joined together in a u201c j u201d channel the vapor barrier strip 50.