What is BS 1088 marine plywood?

A British standard for plywood intended for marine use. It requires all-veneer construction with no core gaps, hardwood veneers of permitted species such as okoume or meranti, WBP phenolic glue throughout, boil testing on production panels, and marking on the panel itself. WBP glue alone does not make a board BS 1088.

Is exterior WBP plywood the same as marine plywood?

No. Exterior WBP plywood has weather-resistant glue, but it usually has core gaps and a softwood or mixed core. BS 1088 requires no core gaps and permitted hardwood species. Exterior plywood is fine for hoarding and temporary shelter; it is not a hull material.

Why is okoume the usual BS 1088 species?

It is light, pale, bends well and takes epoxy and paint cleanly, which suits boat building. Meranti and keruing also appear in the standard for applications where stiffness or hardness matters more than weight. Species is the largest single driver of the price difference between boards that both say BS 1088.

How can I tell if a board is really BS 1088?

Check three things: the marking on the panel (standard, species, manufacturer), the edges for core gaps, and the mill's boil test documentation with a date and the thickness it covers. A board with visible voids in the edge is not BS 1088 regardless of what the invoice says.

Do you hold BS 1088 certificates?

No. Certificates and test documentation belong to the producing mill, and the marking is on the panel itself. We check the marking, the species and the thickness against your order before loading, and we tell you if the evidence does not match.

Marine Plywood BS 1088: Requirements and How to Check

BS 1088 Is Not a Marketing Word

"Marine plywood" is used loosely. In the trade it often means nothing more than plywood bonded with WBP glue. BS 1088 is a specific British standard, and a board either meets it or does not.

The difference is not the glue. WBP glue is a starting point that most exterior plywood already has. What BS 1088 adds is a set of requirements on the core that are expensive to meet and easy to check.

What BS 1088 Actually Requires

Requirement	Why it matters
All veneer construction, no core gaps	A void inside the panel is a place where water collects and where the panel fails under load. BS 1088 panels are specified with no core gaps at all.
Hardwood veneers of a permitted species	Okoume (gaboon) is the classic, light and easy to bend. Meranti, keruing and others appear in the standard's list. Softwood cores are not BS 1088.
WBP (phenolic) glue throughout	Must survive boiling without delamination. This is the part most "marine plywood" already claims.
Boil test on production panels	Sampling and testing is part of the standard's regime, not a one-off type test from a brochure.
Marking and traceability	The panel carries the standard, the species and the manufacturer. An unmarked panel is not evidence of anything.

We do not issue BS 1088 certificates. If a board is represented as BS 1088, the evidence is the mill's marking on the panel plus its test documentation, and we check both against the thickness and species you ordered before loading.

Species, and Why It Changes the Price

Species	Character	Where it is used
Okoume (gaboon)	Light, pale, bends well, takes epoxy and paint cleanly	Boat hulls, decks, cabinetry on board, the classic BS 1088 board
Meranti	Denser and darker, stiffer, heavier	Structural marine work, where stiffness matters more than weight
Keruing	Hard, heavy, dense, coarser grain	Heavy-duty marine and transport flooring

Okoume logs come mainly from West and Central Africa and are processed into plywood in China and elsewhere. The species is the single largest driver of cost, which is why "BS 1088 okoume" and "BS 1088 plywood" can sit far apart on price.

The Three Things Sold as Marine Plywood That Are Not

Exterior-grade WBP plywood. Genuine exterior glue, genuinely weather resistant, but it has core gaps and a softwood or mixed core. It is not BS 1088 and will not behave like it in a hull.
"Marine grade" with no standard quoted. A grade name with no number behind it. Ask which standard, and which clause.
BS 1088 claimed on the invoice only. The standard requires marking on the panel. If the panels arrive unmarked and the only claim is on the paperwork, you have a documentation problem you will discover at the worst moment.

How to Check a BS 1088 Panel

Check	How
Marking	Look for the standard number, species and manufacturer stamped or printed on the panel edge or face.
Core gaps	Inspect the edges of a cut or damaged panel. Visible voids mean it is not BS 1088, whatever the paperwork says.
Veneer count and thickness	Even plies, consistent thickness, no patched areas on the face.
Boil test evidence	Ask for the mill's test documentation, and check the date and the thickness it covers.

None of this requires a laboratory. A sharp eye on an edge and a question about the marking will separate most of the market.

How to Write the Order

Weak	Workable
"Marine plywood 18 mm"	"18 mm BS 1088, okoume, WBP, no core gaps, marked panels, 1220 × 2440 mm"
"Waterproof plywood for a boat"	Say BS 1088 and name the species. Boat work is where a core gap becomes a repair.
"Marine grade, cheapest"	Ask for the standard number. If there is not one, you are buying exterior plywood at a marine price.

For a hull or a deck, the correct question is not which supplier is cheapest but which one will tell you, in writing, which species and which standard the panels actually are.

See the full plywood range — commercial, film faced and marine →