Ordering a tarpaulin that turns up smaller than expected is the most common mistake tarp buyers make – and it usually comes down to one detail: cut size versus finished size. Here is how to measure properly and choose a size that actually covers the job.
Cut size vs finished size
Most tarpaulins are sold by cut size – the size of the fabric before the edges are folded and hemmed. Hemming typically loses 2–5% on each dimension, so a 4m x 5m cut-size tarp may finish around 3.9m x 4.85m. Always allow for this when the fit is tight.
Allow for overhang and tie-down
A tarp that exactly matches the footprint of what it covers will not protect it. As a rule of thumb:
- Flat items (trailers, wood piles): add at least 30–50cm on every side.
- Three-dimensional loads (machinery, furniture stacks): measure over the top of the item in both directions, then add the overhang.
- Roof repairs: extend well past the damaged area – at least 1m beyond on all sides – so water sheds onto sound roof, not into the hole.
Common UK tarpaulin sizes and what they suit
- 2m x 3m: garden furniture, motorbikes, log store fronts
- 4m x 5m: small trailers, ride-on mowers, sand and cement on site
- 6m x 8m: car and boat covers, roof repairs, market stalls
- 8m x 12m and up: haystacks, scaffolding wraps, structural covers
Browse all sizes in our tarpaulins & covers range – from compact garden sheets to industrial super heavy duty tarpaulins.
When no standard size fits
We manufacture bespoke tarpaulins to your exact dimensions, with eyelets and fittings where you need them – or buy tarpaulin material by the roll and cut your own. Get in touch for a quote.