by Quick answer: Plank (made by Brooklyn Bedding) now carries a limited lifetime warranty on purchases after Feb 1, 2025, covering sag deeper than 1.5 inches. Coverage requires a supportive base with slats no more than 5 inches apart, and removing the cover voids it.
By the MattressNut editorial team · Updated June 2026
Plank's Warranty Explained
Plank Firm is manufactured by Brooklyn Bedding and falls under its warranty program. For mattresses bought after February 1, 2025, Brooklyn Bedding provides a limited lifetime warranty. Older purchases and some third-party descriptions still reference a 10-year, non-prorated term. The warranty applies only to the original purchaser and covers defects, not normal softening.
Key Terms (what we could verify)
| Item | Detail |
|---|---|
| Warranty length | Limited lifetime for purchases after 02/01/2025; older purchases may be 10-year, non-prorated |
| Sag threshold covered | Visible indentation greater than 1.5 inches not caused by an improper or unsupportive base |
| Who pays transport | You may need to return the mattress to Brooklyn Bedding; check current terms for shipping responsibility |
| Common exclusions | Stains, abuse, moisture, sag from a bad base, "as-is"/resold units, and removing the mattress cover |
| How to start | brand's official warranty page |
How to File / What to Do
Keep your original proof of purchase and confirm you bought from an authorized retailer, since unauthorized-reseller purchases are excluded. Photograph the defect, and for sag, document depth with a straightedge and ruler. Brooklyn Bedding may also ask for proof that your foundation is suitable, so photograph your base and slat spacing too. File through Brooklyn Bedding's official warranty page.
Common Problems Owners Report
The two recurring denial reasons are support and the cover. Brooklyn Bedding considers any base with slats more than 5 inches apart improper, which voids the warranty, and removing the mattress cover automatically voids a claim. Sagging caused by an unsupportive foundation is treated as your responsibility, not a defect.
The Saatva Comparison
Saatva's Saatva Classic lifetime warranty comes with a 365-night trial, a flat $99 return, and free white-glove delivery with old-mattress haul-away. You won't be asked to ship a king-size mattress back yourself, and there's no cover-removal clause waiting to void your claim. For shoppers who want fewer ways to lose coverage, that's a meaningful difference.
See the Saatva Classic warranty & trial
Bottom Line
Plank's lifetime warranty is strong, but it hinges on a properly supportive base and an intact cover. Document your foundation, buy from an authorized seller, and never strip the cover.
Bottom line: Plank covers sag over 1.5 inches for the original owner, provided your base and cover meet the rules.
Related: our full Saatva mattress review.