Abstract: A rigid tubular member of variable length and rectangular cross-section formed from aluminum or sheet steel stock adapted to be sized, flared and conjoined with at least one other rigid member to create a variety of tubular member frameworks for greenhouse construction, and the like. Each member is provided with a plurality of elongate, linear groovings, either located proximal to, or coincident with, the external and/or internal elongate seams of the member, with the inscribed sets of groovings are such being of a depth sufficient to facilitate separation under manual force of at least one, up to four, of the end sidewall segments, providing flared end segments, either disposed at right or acute angles, which segments are adapted to be fastened to another rigid member in any of several locations, along it, in the course of a framework erection.

Abstract: A rigid tubular member of variable length and rectangular cross-section adapted to be sized, flared and conjoined with at least one other rigid member to create a variety of tubular member frameworks for greenhouse construction, and the like. Each member is provided with a plurality of elongate, linear groovings, either located proximal to, or coincident with, the external and/or internal elongate seams of the member, with the inscribed sets of groovings are such being of a depth sufficient to facilitate separation under manual force of at least one, up to four, of the end sidewall segments, providing flared end segments, either disposed at right or acute angles, which segments are adapted to be fastened to another rigid member in any of several locations, along it, in the course of a framework erection.

Abstract: An improved two-piece, gripping bar device for securing and selective roll-up of flexible sheeting useful is provided in screening outdoor rigid structures, like greenhouses. The identical rod-like pieces present a shape having an elongate cylindrical form upon conjoining which device grips a length of sheeting. The pieces permit firm mating by virtue of a linear mating ridge on the contacting surface of each member which compliments an opposing mating linear recess on the opposing surface of the other member, so that each member presents at least one pair of parallel, linear ridges and linear recesses. Central of the arcuate or somewhat squared outer surface of the device is at least one elongate channel adapted to receive and recess option of fastener heads that will retain a second or third sheet of flexible material and thus also be rolled-up with the inner sheeting to selected vertical heights.

Abstract: An improved two-piece, gripping bar device for securing and selective roll-up of flexible sheeting useful in screening outdoor rigid structures, like greenhouses. The identical rod-like pieces present a shape having an elongate cylindrical form upon conjoining which device grips a length of sheeting. The pieces permit firm mating by virture of a tapered ridge on the contacting surface of each member which compliments an opposing tapered recess on the opposing surface of the other member, so that each member presents a pair of parallel, linear ridges and linear recesses. Central of the arcuate outer surface of the device is at least one elongate channel adapted to receive and retain either a second or third sheet of flexible material and thus be rolled-up with the inner sheeting to selected vertical heights.