No, you don’t need a double tack strip. You only need a tack strip that's a minimum of 1 inch wide and 1/4 inch thick when doing the installation. If the area you are covering exceeds 30 feet, you’ll need architectural strips that are 1 ¾ inch in width with three rows of pins to provide a secure fit.   Make sure the pins on the tack strips don’t stick out through the carpet as that can become a safety hazard in your home. Ensure tack strips are fastened at max stretching capacity, and staple or nail tack strips securely with at least two fasteners per piece.