Waterproof Tarp UK: How to Choose, Use & Maintain the Right Cover
A quality waterproof tarp is one of the most versatile and cost-effective tools you can buy for home, work or outdoor use. But not all tarps are equally waterproof — and understanding the difference between water-resistant, waterproof and fully sealed covers will save you from a costly mistake. This guide covers everything you need to know.
What Makes a Tarp Truly Waterproof?
True waterproofing means water cannot penetrate the material at all — even under prolonged exposure, standing water or heavy rainfall. For a tarpaulin to be genuinely waterproof, it needs:
- A continuous coating — PE or PVC laminate applied to both sides of the base fabric
- Sealed or welded edges — raw cut edges will absorb water and eventually wick moisture beneath the tarp
- Adequate weight — at 90gsm and below, the weave is too open to be reliably waterproof
Canvas tarps are water-resistant (not fully waterproof) — they swell when wet to close the weave but won't hold standing water. For complete waterproofing, PE or PVC tarps from 120gsm upwards are the right choice.
Waterproof Tarp GSM Guide
| GSM | Waterproof Level | Recommended Use |
|---|---|---|
| 60–90gsm | Basic water resistance | Short-term, light showers only |
| 100–140gsm | Waterproof | Garden covers, camping, occasional outdoor use |
| 150–180gsm | Fully waterproof | Market stalls, agriculture, semi-permanent outdoor |
| 190–270gsm | Heavy duty waterproof | Construction, scaffolding, industrial storage |
| 400–600gsm PVC | Industrial waterproof | Lorry curtainsiders, permanent installations |
Top Uses for a Waterproof Tarp in the UK
Roof & Building Protection
One of the most critical applications — a waterproof tarp over a damaged roof, exposed rafters or unfinished construction protects against the UK's unpredictable weather. Use a minimum 170gsm heavy-duty tarpaulin, secured with bungee straps or rope through rust-proof eyelets. Ensure the tarp overhangs at least 50cm on all sides.
Vehicle & Machinery Covers
Covering a car, caravan, motorbike or piece of farm machinery for winter or long-term storage requires a breathable waterproof solution. PE tarps keep rain out but can trap condensation — for vehicles, a canvas or vented cover is preferable. Our waxed canvas tarpaulins are the ideal choice for breathable, waterproof vehicle protection.
Garden & Outdoor Furniture
Covering garden furniture, outdoor kitchens and play equipment through autumn and winter. A 120–140gsm waterproof tarp is perfectly adequate for this use, especially if the items are under a gazebo or porch.
Camping & Outdoor Adventures
A lightweight waterproof tarp (90–120gsm) used as a shelter fly, basha or ground sheet is a camping essential. They pack smaller than tents and provide excellent overhead rain protection when rigged between trees. Look for tarps with corner loops for easy rigging.
Agricultural Storage
Protecting hay bales, silage, grain and equipment from UK rainfall. Heavy duty 200–270gsm waterproof tarps are standard for farm storage — our heavy weight range is widely used across UK farms.
Skip & Waste Covers
Skip hire regulations often require a cover to prevent fly-tipping and spillage. A robust waterproof tarp of 170gsm+ with bungee securing is the standard solution.
How to Secure a Waterproof Tarp
Even the best waterproof tarp will fail if it's not properly secured. The three most reliable methods are:
- Bungee cords with hooks — fastest to attach, ideal for light to medium applications. Hook through eyelets and stretch to anchor points.
- Rope & knots — the strongest option for windy conditions or long-term use. A taut-line hitch allows tension adjustment without untying.
- Ratchet straps — for vehicle or lorry cover securing where maximum tension is needed.
Read our full guide on how to tie down a tarpaulin for step-by-step securing methods for every application.
How Long Does a Waterproof Tarp Last?
Lifespan depends heavily on GSM, UV exposure and how it's stored:
- Economy (60–90gsm): 6–18 months outdoors
- Medium weight (120–170gsm): 2–4 years with regular use
- Heavy duty (190–270gsm): 3–7 years outdoors
- PVC (400–600gsm): 8–15 years
- Canvas (waxed): 10–20 years with re-waxing
Store tarps loosely rolled rather than folded — sharp creases weaken the laminate coating and create potential leak points over time.
Waterproof Tarp Maintenance Tips
Keep your tarp performing longer with these simple steps: rinse off mud and debris with clean water after use; allow to dry fully before storing to prevent mould; re-wax canvas tarps every 2–3 years; check eyelets annually for rust or deformation; and roll rather than fold for storage.
Buy Waterproof Tarps Online — UK Delivery
Tarpaulins UK stocks the full range of waterproof tarps from economy through to industrial PVC grade — all available with next-day UK delivery. Browse our full tarpaulin range or call our team on 01744 520 110 for help choosing the right waterproof cover for your application.
Frequently Asked Questions
Is a tarpaulin the same as a waterproof tarp?
Yes — a tarpaulin and a tarp are the same thing. Most tarpaulins are waterproof, but the level of waterproofing varies by GSM and material. PE and PVC tarps are fully waterproof; canvas tarps are water-resistant.
What is the most waterproof tarpaulin material?
PVC-coated tarpaulins (400–600gsm) offer the highest level of waterproofing and are used for commercial and industrial applications. For most outdoor uses, a PE tarpaulin of 150gsm+ is more than sufficient.
Can I use a waterproof tarp as a roof covering?
Yes — a 170gsm+ heavy duty PE tarpaulin is suitable for temporary roof covering. Ensure it's adequately oversized, secured through eyelets and weighted or tied down at the edges to prevent wind lift.