PEX crimp rings fail faster in cold climates — use cinch clamps instead

Per ASTM F2159, PEX cinch clamps maintain seal integrity at wider temperature ranges than copper crimp rings. In climates below 20°F, copper rings contract at a different rate than the PEX tubing, creating micro-gaps. Cinch (pinch) clamps use a stainless steel band that accommodates thermal expansion better. This is especially critical for exterior wall runs in zones 5-7.