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VYCOM Screwing, Nailing, Stapling Any type of screw or nail can be used to fasten HDPE material: pre-drilling is typically unnecessary. Power nailers and screw driving equipment are suggested. Inserting the screw or nail in an elongated slot or an oversized hole is recommended so that the material can expand or contract if fluctuations in temperature occur. (Figure 2b). For best results, use oversized washers or grommets in combination with screws. A course thread deck screw yields good holding power. Vycom has had its HDPE material tested in accordance to ASTM 1761 by an outside laboratory. Threaded inserts provide strong, usable threads in HDPE. Inserts can be pressed, or placed into HDPE material, and expand when the screw is installed. In small panels under 18” inches or in temperature- controlled environments, allowing for expansion and contraction is not mandatory. Mechanical failures in heating or cooling systems and other unexpected factors can, however, affect temperatures radically and may cause unanticipated expansion or contractions. Nailing is suggested for small, thin panels of HDPE material. To use larger nails and screws, holes should be placed at least one inch inward from any edges and predrilled (Figure 2c). Figure 2b Figure 2c NOTE! Screws should be checked periodically and retightened as necessary. Nails should be checked periodically and replaced, as necessary, due to ‘pop’ after settling. www.vycomplastics.com 12PDF Image | FABRICATION MANUAL HDPE
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