By Janet Bachmann
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Untreated polyethylene will cost less initially; however, the lifespan of the material is significantly less, and the material will likely degrade after one year of use. When treated with a UV inhibitor, 6 mil plastic generally is guaranteed for 3 years. Gases that escape from the PVC (polyvinyl chloride) pipes contribute to the deterioration of the polyethylene plastic. To prevent "off-gasing," paint the PVC pipes with white latex paint. Use wood treated with water-based preservatives for the base of the door frame, where the wood comes into contact with the soil.
The additional construction steps after the erection of the pipe frame are described below. STEP 1. Attach the baseboards (Fig. 3). 65-m) boards. A single 2 × 12-inch × 12-ft board eliminates the potential gap that may occur when two 2 × 6-inch boards are used for the baseboard. 79-cm) washer that overlaps both boards. STEP 2. Attach the hipboard. 2-cm) pipe strap hanger (Fig. 4). Secure the pipe strap hanger to the bow with a small sheet metal screw to prevent the strap from moving up the bow in high winds.
STEP 4. Construct the upper endwalls with a bracing and a vertical board (Figs. 7, 8, and 9). 6-m) board and taper the ends so that it will fit securely between the end bows as a bracing board, temporarily attaching it to the end bow to facilitate measurement of the vertical board. Take another 2 × 4-inch board (flat side out) and place it in the center of the bracing board. Measure and cut the vertical board so that it fits snug between the bracing board and center ridgepole purlin. This will require that the vertical board be notched to fit around the center ridgepole purlin.