How to Choose a Tarp for RV & Boat Travel (2026 Guide)

How to Choose the Right Product

How to Choose the Right Tarp for RV & Boat Travel

Stopping flapping and preventing grommet tears depends on three decisions: material construction, thickness (mil), and how you attach the tarp. Material: polyethylene (poly) is cheap and waterproof; higher-quality woven or laminated poly with UV treatment and heat-sealed hems resists abrasion and sunlight. Look specifically for heat-sealed/folded edges with internal reinforcement (nylon rope or webbing) because sewn hems have needle perforations that can let water and stress cause tearing.

Thickness: 'Mil' is the single most important number for on-the-road use. For occasional low-speed transport or storage in calm conditions, 5 mil can work if the edges are well reinforced. For highway travel, exposed trailers, or long-term outdoor storage, aim for 8–10 mil or higher — thicker film resists punctures and vibration. Thicker tarps also transmit less energy to grommets when wind loads occur, reducing pull-out risk.

Attachment systems: how you fix the tarp matters as much as the tarp itself. Avoid elastic bungee cords as they allow movement that causes chafing; use non-stretch straps, ratchet tie-downs, or cinch straps that keep tension constant. Spread anchors across multiple grommets to distribute load and add tarp clips or edge clamps in weak spots. When covering an RV roof or boat, fold the edge under and add a backing strap or webbing sling under the hem to carry load away from a single grommet. If you expect strong wind, integrate soft edge padding or run support lines over the tarp to reduce direct wind shear.

Grommet quality & spacing: metal grommets spaced every 24–36" are common; closer spacing gives more places to tie down and reduces wind catch between anchors. Check for rust-proof grommets and reinforced corners — corners see the most stress, so look for plastic corner plates or double-reinforced hems.

Repairs & maintenance: carry tarp repair tape, spare tarp clips, and a roll of webbing. Patch tears early with adhesive repair tape on both sides, and reinforce grommets with washers or extra webbing if they start to elongate.

Budget Tiers

Budget (low cost): Expect 3–5 mil poly, basic grommets, and decent short-term protection. Good for occasional storage or calm weather. Mid-range: Better edge reinforcement, heat-sealed hems, and more consistent finished sizes; 5–8 mil material is common and better for light travel. Premium: Thicker films (8–10+ mil), reinforced hems, rust-proof grommets, and larger formats designed for long-term outdoor use; these cost more but reduce tear risk in active use. Match the tier to how often you'll travel and the wind exposure you'll face.