Tent Waterproof Ratings

Tent Waterproof Ratings

Tent fabric will be made with a waterproof membrane or coating that prevents water droplets from penetrating through the fabric. A Hydrostatic Head rating determines how waterproof a fabric is. For waterproofing, the minimum rating for a tent to be waterproof is 1,000 mm. The higher the rating, the more waterproof the tent is.

The rainfly of a tent may have a lower waterproof rating than the ground sheet.

It should be noted that the rating does not take into account wind driven rain, which requires a tent with a rating of at least 2,000 mm. The water repellent coating breaks down over time, and use, and may require the owner to purchase a tent fabric re-proofing product.