Choosing the Right Tarp for British Weather

Why a tarp suits British weather

Ask anyone who has spent a night out in a British wood in November and they will tell you the same thing: the rain rarely comes straight down. It arrives sideways, in gusts, off the back of a squall, and it finds every gap in a poorly pitched tent. A tarp, by contrast, is endlessly adaptable. You can lower one edge into the wind, raise the other for headroom, and reconfigure the whole thing in ten minutes when the wind shifts. There is no sewn-in shape to argue with.

A tarp is also forgiving in ways a tent is not. It is lighter, cheaper, and gives you a fire-warmed, open-fronted space that does not fill with condensation. Pitch one properly and you will sleep drier than you would under a sagging flysheet. Pitch one badly and you will learn quickly, which is part of the appeal.

Fabric: the choice that matters most

Fabric decides how heavy your tarp is, how long it lasts, and how much noise it makes at three in the morning. Look for two numbers: the denier (the thickness of the threads) and the hydrostatic head (how much water pressure the coating resists before it leaks). Anything below about 1,500mm will see you through drizzle; 3,000mm and above will handle a proper soaking.

• Coated polyester (around 210D, PU-coated): the budget workhorse. Tough, UV-resistant, cheap, but heavier at roughly 1kg for a 3x3m. Hydrostatic heads of 2,000–3,000mm are common.
• Silicone-impregnated nylon (silnylon): light and packable, often 30D, with excellent strength for its weight. It stretches when wet, so you will need to re-tension guy lines overnight. Silicone coatings also resist UV and stay supple in the cold.
• Silpoly: the middle ground many bushcrafters now favour. Nearly as light as silnylon, with far less sag, so pitches stay taut through a wet night.
• Cotton canvas or polycotton: heavy, bulky, and wonderful under a fire. The fibres swell when damp and seal themselves, and it will not spit sparks like a synthetic sheet. Best for a permanent or semi-permanent woodland camp rather than a pack.

Whichever you choose, check for taped or sealed seams. Untaped seams on a cheap tarp will weep within an hour of steady rain.

Size and shape: how much shelter do you actually need?

A 3x3m square is the classic starting point and arguably the most versatile size for solo or two-person use. It pitches as an A-frame, a plow point, a lean-to, or a diamond fly, and weighs little enough to carry all day.

• 2.5x3m: light and quick, ideal for one person and a pack. Cramped for two.
• 3x3m: the all-rounder. Enough floor for two sleepers lying head to foot, or one person plus kit and a small cooking area.
• 3x4m: a genuine two-person shelter with living space. Heavier, and needs more trees or poles to pitch well.
• Rectangular versus square: rectangles give longer ridge lines for hammock camping; squares give more pitching options overall.

Buy the lightest tarp you can afford that still has enough coverage. A tiny tarp that leaves your sleeping bag touching the walls will soak you regardless of its hydrostatic head.

Pitching for wind and driving rain

In sheltered woodland you have options. On an exposed ridge or a Scottish glen, you do not.

• Low A-frame: the default in bad weather. Ridge line into the wind, edges pegged tight to the ground, one end closed against the squall. Cut the height until the wind stops lifting the fabric.
• Plow point: one corner tied high to a tree, the opposite edge pegged down. Excellent for a quick solo shelter, but it presents a large face to the wind — orient it carefully.
• Lean-to: a sloping roof with an open front facing away from the weather, ideally with a fire in front. Perfect for a dry, sociable camp in mixed conditions.
• Hammock pitch: a long diagonal fly over the hammock, pitched slightly off-centre so you have a dry porch to stand and cook under.

Always pitch with the lowest edge facing the wind and rain. Angle guy lines at roughly 45 degrees to the ground and in line with the seams where possible, so the fabric takes the strain evenly.

Site selection and the details that keep you dry

Look up before you look down. Dead branches and whole limbs come down in winter gales, so avoid camping beneath large mature trees with heavy crowns, especially beech and sycamore. Avoid valley bottoms too — cold air and water both pool there, and you will wake in a frost hollow or a puddle.

Two small details make a disproportionate difference. First, fit short drip lines — 20–30cm of cord — to the corners and tie-out points, so water running down the guy line drips off before it reaches your sleeping area. Second, use shock cord loops at the pegging points; they keep the pitch taut as the fabric stretches and slackens, and they give in gusts rather than tearing out the eyelets.

Looking after your tarp

A tarp is only as good as its last drying. Pack it away damp and you will return to mildew, a smell that never quite leaves, and fabric that has lost its coating. Dry it thoroughly at home, loosely folded, out of direct sun. Shake out pine needles and grit before folding.

Inspect seams and eyelets after every trip. A small tear can be fixed in the field with a patch of spinnaker tape or a dab of silicone seam sealant, and a re-proofing spray every couple of seasons will bring a tired coating back to life. Treat it well and a decent tarp will outlast several tents — and teach you far more about shelter along the way.