Patent ID: 8806837

Claim:
A method of installing a ceiling plank assembly comprising, a) providing at least two elongated generally rectangular wood composition or plastic composition ceiling plank members with a predetermined thickness that renders the elongated ceiling plank members with a predetermined resilient flexibility to facilitate installation of the elongated ceiling plank members on a ceiling, b) providing each said elongated ceiling plank member with two opposite elongated side edges and two opposite end edges, c) forming the full length of each of the side edges and each of the end edges with complementary interengaging joining means for joining the two elongated plank members in side-by-side or end-to-end engagement, d) limiting the full length of said elongated side edges to between 9 and 10 times the width of the opposite end edges, e) providing one of the elongated side edges and one of end edges of each of the elongated ceiling plank members with a. groove-like engagement profile including spaced sidewalls and a channel, and providing the other of the elongated side edges and the other of the end edges of each of the elongated ceiling plank members with a complementary tongue-like engagement profile, to permit tongue and groove interengagement of the two elongated ceiling plank members in side-by-side or end-to-end engagement, f) securing a metallic ceiling plank securement clip to a ceiling by providing the ceiling clip with a base and means for securing the base to a ceiling, g) using the ceiling clip that is secured to a ceiling to hold a grooved side edge of one of the ceiling plank members against the ceiling by further providing the ceiling clip with a holding prong for accommodation in the channel of the groove-like engagement profile at the side of the one ceiling plank member to sandwich one of the channel sidewalls between the holding prong and the ceiling, said prong having a first portion projecting from a substantially central portion of said base and a second portion attached to a distal end of said first portion configured to engage one of the channel sidewalls when installed, said second portion having a free edge distal from said first portion terminating in two points with a concave portion extending therebetween, said base further having an aperture corresponding to the shape of said second portion, said aperture defining a perimeter and said first portion is attached to said base at an edge of said perimeter, said securement means including at least one elongated fastener opening in said base, and h) joining the other elongated ceiling plank member in side-by-side or end-to-end engagement with the one elongated ceiling plank member by interengaging the tongue-like engagement profile at the side or end of the other ceiling plank member with the side or end of the one ceiling plank member.