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Split your purchase of £55.00 into 4 with no sign-up fees or late fees. Your purchase will be split into 4 payments, payable every 2 weeks
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third payment
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fourth payment
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Choose Clearpay at checkout to pay later with Pay in 4.
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£55.00ex. VAT
Key Features
{{anchor}} Suitable for marine, outdoor, and general joinery
{{fitness_center}} Built from hardwood veneers
{{gpp_good}} Certified to BS1088
{{water_drop}} Withstands prolonged wet exposure without swelling
Technical Specification
Technical Specification
URN:
4002020
Product:
Marine
Application:
Marine hulls & decks, external joinery, van linings
Indoor/Outdoor Usage:
Exterior (if treated), Interior
Thickness:
18mm
Width:
1220mm
Length:
2440mm
Weight:
26.81kg
Sales Unit:
Sheet
Sales Unit Coverage:
2.98m2
Grade:
BB / CC, BS1088
Wood Species:
Keruing / Meranti
Edge:
Square
Bond Class:
BS EN636-3 (Class 3)
Finish:
Veneer
Formaldehyde Level:
E1 (low)
Country of Origin:
China, Malaysia
Product Overview
BS1088-certified marine-grade plywood sheet, measuring 2440mm x 1220mm (8' x 4') with an 18mm thickness.
Made from durable tropical hardwood veneers and bonded with waterproof adhesive, it resists swelling, warping, delamination, and rot even under prolonged moisture exposure.
Unlike standard plywood, it contains no core voids, preventing water entrapment and improving overall strength.
Widely used for hull planking, flooring, and heavy-duty marine construction, the solid hardwood face is pre-sanded and can be left natural, stained, or varnished.
Features & Benefits
BS 1088 Certification: Verified compliance with British Standards for marine-grade plywood ensures the board contains no core gaps and utilises high-quality tropical hardwood.
WBP Phenolic Bonding: Weather and Boil Proof resin prevents delamination of veneers even in saturated or high-temperature conditions.
Void-Free Core: The absence of internal gaps ensures consistent strength across the entire sheet and prevents moisture from pooling within the board.
Rot-Resistant Hardwood: Constructed from naturally durable timber species that offer inherent resistance to fungal attack compared to standard softwood plys.
Impact Resistance: High-density hardwood veneers provide a robust surface capable of withstanding mechanical stress and heavy-duty use.
Moisture Performance: Withstands long-term immersion without structural failure, unlike MR MDF or standard plywood products.
2440mm x 1220mm Dimensions: The standard sheet size covers 2.98m² per board to maximize surface coverage and minimise off-cut waste.
Thickness 18mm: Heavy-duty board for hull planking, structural flooring, and demanding joinery.
Please Note: Colour and finish are representative only and may vary slightly as this is a natural product.
Applications
Marine hull and deck construction: High-specification BS1088 boards provide the necessary void-free core and durable hardwood veneers for structural boat building and repair.
External joinery and landscaping: Superior moisture resistance makes 18mm marine plywood ideal for roof supports, planters, and high-end garden structures exposed to the elements.
Vehicle and van lining: Impact-resistant hardwood construction handles heavy-duty use and resists degradation from condensation in commercial vehicle interiors.
Balcony and roof terrace decking: Structural 18mm profile provides a stable, rot-resistant substrate for waterproof membranes on external elevated platforms.
High-humidity interior joinery: Durable core and face veneers prevent warping and delamination in commercial kitchens, laundries, and indoor swimming pool environments.
Installation Guidance
Seal edges and faces: Extends service life when exposed outdoors.
Use waterproof fixings and adhesives: Maintains performance under wet conditions.
Apply varnish or paint if exposed: Enhances appearance and adds further protection.
Compliance & Performance
Standard: Certified to BS1088 for marine-grade plywood.
Veneer quality: Manufactured from durable tropical hardwood, free of core voids.
Bonding: Waterproof adhesive suitable for continuous wet exposure.
Classification note: Formerly referred to as WBP plywood; superseded by BS1088 and EN standards.
Delivery & Returns Information
Delivery charges vary by product category and order value. Items may ship from different suppliers and arrive separately, so delivery charges can be shown per part of your order at checkout.
Standard (Nationwide) Delivery
Core Products
Core
ORDER VALUE
DELIVERY CHARGE
Under £300
ex. VAT
£30
ex. VAT
Over £300
ex. VAT
FREE
Core Delivery charges apply only when all products in an order that have equivalents are accepted as such. If even one product cannot be substituted with an equivalent, the entire order will not qualify for Core Delivery charges.
Timber & Sheet, Building Materials, Joinery and Gardens & Landscaping Products
ORDER VALUE
DELIVERY CHARGE
Under
£300
£25
ex. VAT
Over
£300
ex. VAT
FREE
Express Delivery
Express Delivery - Insulation and Plasterboard & Drylining
ORDER VALUE
DELIVERY CHARGE
Under
£400
£90
ex. VAT
Over
£400
ex. VAT
£55
ex. VAT
Express Delivery - Timber & Sheet, Building Materials, Joinery and Gardens & Landscaping Products
We work with a nationwide network of trusted suppliers. Items in your basket may be supplied by different suppliers and delivered separately. Where this applies, you will see delivery charges shown at checkout for each part of your order. We always aim to group products from the same supplier to keep delivery costs as low as possible.
Delivery areas
Delivery charges apply to mainland UK, excluding: AB, CA, CF, DD, DG, EH, EX, FK, KA, KW, KY, IV, LA, LD, LL, ML, NP, PA, PH, PL, SA, SY, TR, TQ and TD.
If your address is in one of these areas, we will contact you before processing your order to confirm any additional costs. We do not currently offer delivery outside the UK mainland.
What to expect on delivery day
Deliveries are typically kerbside.
Please ensure someone is on-site to accept delivery. For heavier items, help with offloading may be required.
Many building materials arrive on large vehicles. If access is restricted, a specialist vehicle such as a HIAB may be required and could incur an additional charge.
Why delivery can cost more than typical parcel delivery
Building materials often travel on larger vehicles and usually carry fewer drops per run than parcel networks. That is why delivery charges can be higher than standard e-commerce shipping.
Returns
Returns depend on what you have bought and whether there is anything wrong with it. For full details on eligibility, timeframes, and exclusions, please see our full policy.
As a builder, I regularly use 18mm marine plywood in my construction projects. It's reliable, stable, and has a beautiful finish. I highly recommend it.
Henry Williams on
The price was competitive and my contractor was really happy with the quality
Sylvia H on
I recently used this 18mm marine plywood for a renovation project and it was the perfect choice. It's reliable, sturdy, and resistant to warping, making it ideal for high-moisture areas.
Xander Dipshaw on
Great product and great service, thanks
Sam Burn on
I'm a contractor and frequently use this 18mm marine plywood for my construction projects. It's durable, versatile, and easy to work with.
Dan G on
Sturdy and easy to work with, making my DIY project a breeze. I highly recommend it to anyone looking for a reliable and durable material.
BS 1088 is the British Standard specification for marine plywood, ensuring the board is manufactured to withstand high-moisture environments and immersion. To meet this standard, the plywood must use WBP (Weather and Boil Proof) glue and contain no internal core gaps where water could collect.
Is marine plywood waterproof?
Marine plywood is made with waterproof glue (WBP) to prevent delamination, but the wood itself is not naturally waterproof and will eventually rot if left raw. To ensure it stays watertight and lasts, you must seal all surfaces and edges with a high-quality marine-grade varnish, epoxy, or paint.
Important: If your project involves critical structural safety or immersion in water, please consult a professional surveyor or specialist builder to ensure your sealing method is sufficient for the environment.
What is the difference between marine and exterior plywood?
The main difference lies in the quality of the internal layers and the wood species used. While both use waterproof glue, marine plywood has zero internal gaps (voids) and uses higher-quality, rot-resistant veneers throughout.
Is it possible to use wood stain on this product?
I need to stain this product with Rich Mahogany wood stain to match existing decor. Is that possible with this ply?
Yes, you can use a Rich Mahogany wood stain on 18mm Marine Plywood to match your existing décor. Marine plywood is typically made with high-quality veneers and waterproof glue, making it durable and suitable for staining.
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