Updated October 2026
Damp air rarely harms a plain paperback. The glossy, foiled and laminated covers are the ones that ripple and curl. Start by finding which of your titles carry those finishes, because for most titles storage conditions never come up.
Humidity can make premium coated and foiled covers ripple. Most uncoated trade paperbacks store well in ordinary ambient conditions, so only part of a catalog needs any thought about storage. Our warehouses are dry and ambient, and we don't hold a set humidity or temperature range.
By The Fulfillment.com team
Paper soaks up moisture when the air is damp and gives it back when the air dries out, and its fibers swell and shrink as it does. A plain uncoated sheet takes in moisture evenly on both sides, so it moves evenly and stays flat. A standard uncoated trade paperback is printed on that kind of paper, which is why it can sit in ordinary ambient storage without warping.
Coating changes that. A coated cover (gloss, satin or spot-UV) seals the printed side of the sheet, while the back stays open to the air. One side gains and loses moisture faster than the other, and the sheet starts to curl. Foil, lamination and slipcase boards each add a layer that moves at its own rate. In humid storage, a premium foiled hardcover or a glossy collector's edition can cockle, ripple or curl long before a matte paperback shows any change.
The finish on each cover tells you which titles need any thought about storage.
A quick way to sort a catalog is by how sealed and layered each cover is. The more layers on the surface, the more moisture matters.
Use this sort as a first pass. What a title needs depends on its stock and finish, and on the climate where your books are held. Check the paper and finish of each title before you decide what to ask a storage partner for. Storage decides how a book holds up on the shelf. For how it survives the trip to the reader, see our guide to protective book packaging and damage prevention.
Our buildings stay dry at ambient temperature, with nothing holding humidity to a set level. For titles you want kept in a set humidity range, ask any 3PL you're considering:
When your books reach our dock, our team checks their condition at receiving before the copies go into storage.
A customer sees a warped cover the moment they open the box. On a premium edition, such as a foiled hardcover, a glossy special edition or a slipcased set, the finish is what they paid extra for. A rippled cover looks damaged even when every page is fine. It can bring the same return, and do the same harm to how buyers see your brand, as a bent corner.
Storage and protective packing aim at the same result: a premium book that leaves the building looking like one. For coated and foiled stock, work out what conditions the finish needs before you choose a partner.
It depends on the stock. Uncoated trade-paperback paper mostly handles ambient storage well. Premium coated and foiled stock is another matter. Humidity can make a glossy or foiled cover curl, because the coating and the paper under it take on moisture at different rates. So the stock on each title tells you whether storage conditions matter.
A coating is a seal on one face of the cover only. Moisture moves through the bare back faster than through the sealed front, so the sheet bends, and foil or lamination adds a layer that moves differently again. Text paper with no coating takes on moisture the same way on both faces. That is why a standard trade paperback copes with ambient storage far better than a glossy or foiled premium cover.
No. Our warehouses are dry and ambient, and we don't hold a set temperature or humidity range. Most uncoated paperbacks need nothing more. Premium coated and foiled stock is the part of a catalog that reacts to humidity. Tell us early about any title you want kept in a set range, and we'll talk through what it needs with you.
In general, the more finish a cover carries, the more moisture affects it. Coated covers (high-gloss or spot-UV), foiled and laminated premium covers, and slipcases are the ones to check. Matte uncoated trade paperbacks usually aren't a concern. Go by the stock and finishes you printed, not by the title.
They're two separate questions for any 3PL. Storage conditions decide how a finish holds up on the shelf. Protective packing, with rigid mailers, corner protection and filler, decides how the book is packed before it goes to the carrier. A premium foiled hardcover needs both answered. Ask what conditions it would be stored in, and ask to see how it would be packed. Our protective-packaging guide covers the packing side.