fig6 and 8 the integral fingers 16c on the base portions will cover the portion of the intermediate walls 10c of the corner post which form the exterior guides 10d for receiving the siding members according to a preferred embodiment adhesive is applied to selected portions of the corner cap and or the corner post to securely attach the corner cap to the corner post a modified form of a corner cap according to the present invention is illustrated in fig1 12 the corner cap 160 comprises a pair of substantially planar base portions 160a which are hinged together at a corner 160b which is integrally formed with the base portions each of the planar base portions 160a includes an integral distal finger portion 160c further each of the planar base portions 160a has an integral wall portion 160d extending perpendicular to the plane of the base portion further each wall portion 160d extends along the edge of the base portion which includes the distal finger portion 160c further each of the wall portions 160d has a plurality of stiffening ribs 160e that are integral therewith and that extend normal to the plane of the base portion see fig1 11 when the base portions 160a are in a selected configuration the wall portions 160d define a short v shaped channel.