Best Fireproof Safe for Home Documents: Fire Rating, Size and Lock

Get at least a UL 1-hour rating for a home safe. UL 72 Class 350 means the inside stays below 350 F during the test, which protects paper; the 1-hour test heats the outside to 1700 F. A half-hour rating, tested at 1550 F, suits a document box that sits in a less exposed spot.

Measure what goes in and add room for growth. A 0.36 cu ft document box holds files and passports; a 1.2 cu ft safe adds room for jewelry, cash, drives and a stack of folders; 2 cu ft holds binders standing up in a 19.6 inch tall interior. Letter paper is 8.5 x 11 inches, so check that both interior width and depth exceed that.

No safe is fireproof forever; they are fire resistant for a rated time. A UL 1-hour rating means the inside stayed below 350 F for 1 hour at 1700 F, followed by cooling in the closed furnace. Longer fires or hotter spots can exceed that.

Not always. A Class 350 rating protects paper, but digital media fails at much lower temperatures, which is why UL has separate Class 125 ratings for media. SentrySafe states its 1-hour models keep interior temperatures safe for DVDs and USBs. For important files, keep a second copy offsite or in the cloud as well.

Only if it carries a water rating. The SentrySafe 1-hour models here are ETL verified for 24 hours in water up to 8 inches deep, which covers firehose runoff and minor flooding. The CHW30220 document box is ETL verified for 72 hours of full submersion.

Fire safes are built to resist heat, not determined prying, and most carry no burglary rating. Bolting the safe to the floor stops someone carrying it away; both 1-hour picks here include bolt-down hardware and live-locking bolts. Keep a small document box hidden.

Bolt it to the floor in a closet or other spot out of sight, ideally on a ground floor. Avoid low spots that flood beyond the water rating. Allow door clearance; the STW123GDC needs 14.75 inches to open fully.

A keypad opens faster and lets you set your own code, but it runs on batteries; the STW123GDC uses four AAA batteries and has a backup key. A dial needs no batteries and has no electronics to fail. The SFW205CWB uses a preset dial combination.

Fire safe insulation holds moisture by design, which turns to steam in a fire and keeps the inside cool. In a closed safe that moisture can raise humidity. A desiccant pack and opening the safe now and then keep paper and metal dry.

The 1.23 cu ft SentrySafe STW123GDC weighs 86.7 pounds, and the 0.36 cu ft CHW30220 document box weighs 24 pounds. Larger 2 cu ft floor safes weigh more, so plan on two people to move one. The weight comes mostly from the fire insulation in the walls.