MATTRESS SIZE REFERENCE GUIDE
The International Sleep Products Association (ISPA) is a trade association comprised of mattress manufacturers and suppliers. Like many other major brands, Paramount Sleep is a long-standing partner of ISPA. ISPA’s goal is to support innovation and growth across the sleep products industry.
ISPA has established standards for mattress sizes that includes allowable variances. Below is a detailed explanation of these standards.
ISPA VARIATION STANDARDS
*If a ”bunkie” foundation is used, it shall have the same width, length, and tolerances as the finished twin-size box spring.
*Finished sizes are measured from outside to outside of tape edge at the centerlines of the width and length.
*The distance is measured between extreme outside edges of finished construction.
*The following dimensional tolerances apply to both lengthand width: up to 60″, + 3/4″, -1/2″; over 60″, + 1″, -3/4″; the comer radius is 3″.