Barbed light weight concrete fastener and plate

Apparatus for holding a flexible membrane to a roof deck of cementitious material comprising:

• a. a plate having a bottom surface in facing contact with the membrane and a top surface, the plate having an outer periphery and a central hole;
• and
• b. a fastener having a head in facing contact with the plate top surface and a pair of diverging legs extending through the plate central hole and through the membrane and into the cementitious roof material to capture a concrete wedge therebetween, the legs having respective first ends bendably joined to the head, free ends, middle wall, and side walls, the leg middle walls having respective barbs protruding therefrom proximate the free ends thereof, the barbs digging into the cementitious roof material to resist pullout of the fastener from the cementitious roof material.

An article of manufacture useful as a plate in facing contact with a roofing base ply and covered with asphalt and a top ply, the plate having an outer periphery and a central hole and defining a plurality of obround openings therethrough proximate the outer periphery,

• so that the openings are filled with the asphalt to form plugs of asphalt in the respective openings that adhere to the base ply along shear areas that resist pulling of the base ply relative to the plate and that adhere the top ply to the base ply.

An article of manufacture useful as a plate in single ply roofing systems, the plate being in facing contact with a first roofing ply adjacent an edge thereof and covered with an adhesive, the plate having an outer periphery and a central hole and defining a plurality of obround openings therethrough proximate the outer periphery,

• so that the openings are filled with adhesive in the respective openings that adhere to the first roofing ply along shear areas that resist pulling of the first roofing ply relative to the plate and adhere to a second roofing ply that overlaps the first roofing ply along the edge thereof.