18mm Marine Plywood 2440mm x 1220mm (8' x 4')
- BS1088 marine plywood standard
- Moisture-resistant hardwood construction
- For floors, roofs, walls and joinery
- Seal exposed edges before external use
Description
Product Information
18mm marine plywood sheet comes in a standard 2440mm x 1220mm size, making it a practical choice for large-area building, joinery and renovation work. It is suitable for applications where a stronger, moisture-resistant board is needed, including floors, walls, roofs, furniture, exterior projects and marine-related uses. Made to the BS1088 marine plywood standard, it should be sealed before outdoor or high-moisture use.
Use & Application
This marine plywood 18mm is suitable for jobs that need a strong, moisture-resistant sheet for building, joinery, exterior or marine-related work.
- Flooring and subfloors - suitable for flooring projects, subfloors and repair work where a durable plywood board is required.
- Walls and partitions - can be used for wall lining, boxing-in, backing panels and general internal construction.
- Roofing projects - suitable for roof decking and covered roofing work when correctly installed and protected.
- Furniture and joinery - useful for cabinets, shelving, storage units, worktops and other made-to-measure joinery.
- Exterior projects - can be used outdoors when the board is properly sealed, especially on exposed faces and edges.
- Marine-related work - suitable for boat repairs, marine applications and other areas exposed to higher moisture levels.
- General building work - a practical full-size 2440mm x 1220mm sheet for renovation, repairs and larger site projects.
For a lighter option, our 12mm marine plywood offers the same 2440mm x 1220mm sheet size and BS1088 standard, making it a practical choice for walls, roofing, furniture and joinery where 18mm thickness is not needed.
Benefits
- Durable 18mm sheet - a solid board for flooring, walls, roofing, furniture and general building work.
- Good moisture resistance - suitable where standard plywood may not be enough, especially when properly sealed.
- BS1088 standard - made for demanding, moisture-prone and marine-related applications.
- Full 2440mm x 1220mm size - covers larger areas with fewer joins.
- Suitable for protected external use - can be used outside when exposed faces and edges are treated.
- Easy to work with - can be cut, fixed and finished for construction, renovation and joinery tasks.
FAQs
Is 18mm marine plywood structural?
18mm marine plywood is a strong, moisture-resistant sheet, but structural suitability depends on the project specification, support centres and load requirements. Always check the design requirements before using it for load-bearing applications.
Do cut edges of 18mm marine plywood need sealing?
Yes, cut edges should be sealed before outdoor or high-moisture use. Edges can absorb moisture more easily than the face of the board, so sealing helps protect the plywood and improve long-term performance.
Can 18mm marine plywood be used for roof decking?
Yes, it can be used for roof decking and covered roofing work where a strong, moisture-resistant board is required. It should be correctly supported, fixed and protected as part of the full roof build-up.
Is this BS1088 marine plywood?
Yes, this is BS1088 marine plywood, making it suitable for demanding applications where board quality and moisture resistance are important.
Is 18mm marine plywood waterproof?
Marine plywood has better moisture resistance than standard plywood, but it is not a finished waterproof surface. For outdoor or high-moisture use, exposed faces and edges should be sealed or treated.
Can 18mm marine plywood be used for flooring?
Yes, this 8x4 marine plywood can be used for flooring and subfloor projects where a strong, moisture-resistant board is needed. It should be properly supported, fixed and sealed where required, especially in areas with higher moisture exposure.
How much does an 18mm marine plywood sheet weigh?
This marine plywood sheet weighs approximately 39kg, so two-person handling is recommended for safe lifting and positioning on site.
Should I choose 18mm or 12mm marine plywood?
Choose 18mm marine plywood when you need a thicker, stronger and more rigid sheet for heavier-duty work. Choose 12mm marine plywood for lighter applications such as wall lining, furniture, cabinets and joinery where 18mm thickness is not required.
Specification
| Thickness | 18mm |
|---|---|
| Finish | Veneer Smooth Sanded |
| Application | Walls, Floor, Furniture, Roof |
| Size | 2440mm x 1220mm |
| Fire Rating | None |
| Edging | Square |
| Moisture resistant | Yes |
| Grade | BS1088 |
| Class | BS EN636 Class 3 |
| Wood Species | Keruing, Meranti |
| Weather Exposure | Exterior (needs to be treated) , Interior |
| Weight | 39 kgs |
Data Sheets
Delivery Information
Delivery Information
We offer fast and reliable delivery across London, Essex, and surrounding areas beyond the M25.
- We aim to deliver on the same or next working day whenever possible for stocked items.
- The standard delivery timeframe is 1–5 working days, depending on your location and product type.
- Orders are delivered kerbside only — please notify us in advance of any access restrictions.
Once your order is placed, our Customer Care team will be in touch to confirm delivery details.
If your delivery is scheduled for the morning, we will call you the evening before to confirm the timing.
We also send a confirmation email once your order is booked in.
While we always aim to deliver on time, please note that delays may occasionally occur due to circumstances beyond our control (e.g. traffic, supplier delays, access restrictions).
Delivery Areas & Charges
Minimum order values vary by postcode.
Click here to view our full postcode list and delivery thresholds
If your postcode isn’t listed, we may still be able to deliver — please share your address and basket total, and we’ll confirm availability within 24 hours.
Returns & Refunds
- We accept returns within 28 days for most unused and resaleable items.
- A restocking fee and collection charge may apply.
- Some items (e.g. custom-made, opened, or time-sensitive materials) are non-refundable.
- Refunds are processed within 28 days to the original payment method.
Please view our full returns policy
Stocked vs. On-Request Products
- Stocked items are dispatched promptly from our local branches.
- On-request or special order items may take longer. We’ll confirm the expected lead times after checkout.
Returns & Refunds Policy
Returns Policy
Our general return policy terms are outlined below.
- We would gladly accept returns for anything you have purchased from us online within 28 days of delivery if you should change your mind and desire to return anything purchased from us, subject to our terms and conditions related to goods not being eligible for a refund. The products you want to return must be brand new, unused, and in perfect condition for resale.
- If you are a consumer as defined by the Consumer Contracts Regulations and you cancel your purchase within 28 calendar days from the day after receiving the products, you will get a refund that includes shipping charges, minus any deduction imposed in accordance with section 7.) below.
- If you decide to cancel your order, you are obliged to return the goods at your own expense. This must be done via a tracked and signed for delivery, or you may also refer to our section on returning items in-store (1)
- Before returning the items, you must provide us with written notice. If a package is returned to us by courier without warning, we retain the right to reject delivery.
- Your order number, contact information, and information on the items being returned should all be included in your notice of cancellation. The notification must be sent to us either by email, via our contact us page online, our page online, or alternatively by post.
- Until the products have been returned, you have a responsibility to ensure that you treat them with reasonable care. We retain the right to reject your request for a refund if the returned items are not in perfect condition for sale.
- If you return an item to one of our locations, there will be a minimum 15% restocking fee added to the returned items.
- An additional delivery charge of £40,00 will be applied (the delivery charge may vary depending upon your location and product type) along with the restocking charge if the items must be collected from your site.
- It will be the customer's obligation to either pick up the item(s) from our Romford branch or have a courier collect it from us if the item(s) returned are not in line with section 2. The time and date of the collection must be communicated to us via our contact page or via email. Items can only be kept for a maximum of 28 days.
- In accordance with the terms and conditions of online sales, the client is responsible for paying the cost of return delivery.
- Only the original credit card used for the purchase may be refunded. Refunds will be processed within 28 days of receiving the returned products, provided that section 2 is followed. After inspecting the returned products, we will reimburse the order using the original payment method. Within 28 days of receiving the item(s) back, the whole return process—including the money being refunded to the original payment method—will be completed.
- Once the refund is made, you will receive an email confirming the credit is being applied. The refunded amount should reach your account within 2 – 5 working days of receiving the credit-applied email notification.
Exchanging products
- If you are dissatisfied with the goods you received, you can exchange them for new ones rather than obtaining a complete refund.
- In rare situations, we may be able to deliver replacement items while exchanging the originals. However, this is dependent on the nature of the reported concern. For further information, please contact our customer service team.
In-store Return
- Please bring your order confirmation and picture ID if you wish to return something in-store. Any goods returned to other branches will be rejected and sent to the Romford branch.
- All refunds will be provided in accordance with our usual returns procedure, as outlined in the general returns policy conditions listed above. Please see components for further details (1–9). Refunds are only available to the original payment card.
- All orders returned in person to our Romford Branch may only be accepted between our Ecommerce hours of Monday to Friday, 7:00 a.m. to 5:00 p.m. If the order is returned outside of these hours, it will be denied, and you will be asked to return it within our regular business hours.
Products not eligible for refund
- Due to the nature of our products, we cannot accept returns on some items.
- Goods that we cannot ensure can be resold in line with health and safety regulations, such as packaged products that we cannot guarantee were stored in specific for that product conditions and, as a result, may be compromised in nature and cannot be returned.
- Goods that we cannot confirm can be resold in line with health and safety regulations, such as packaged products that we cannot guarantee were stored in specific for that product conditions and, as a result, may be compromised in nature and cannot be returned.
Please find here the list of items we do not offer refunds:
- Made-to-measure or bespoke/personalised products.
- Perishable goods.
- Any product with short shelf life or sell-by date.
- Any bulk bag products
- Sand or products delivered in an open fashion.
- Specially obtained/ordered goods.
- Boilers/Cylinders which have been opened.
- Cementitious goods (e.g. cement).
- Plaster-based products (e.g. multi-finish).
- Mixed paints/liquids
- Chemicals/liquids which have been opened.
- PIR insulation boards.
- Toilet seats have been opened due to hygiene purposes.
- Sealed/sensitive electrical goods, if in sealed packages that have been opened, e.g. circuit boards.
- Goods that have been fitted/installed.
- Any goods have become mixed inseparably with other items/orders after their delivery.
We cannot give a refund or exchange due to the nature of these materials unless they are damaged. Please keep in mind that in some cases, store credit may be granted to be used for your future order.
Faulty Products
- Suppose the goods delivered (including custom orders and made-to-measure items) are defective or damaged. In that case, we will repair/exchange them or give you with a full refund, including shipping expenses.
- If an item(s) supplied by our local transportation comes broken or defective, we will only recover the damaged / faulty item(s). If you want to return another product as a regular return, you must bring it back to the Romford branch.
- Any defect or damage must be reported in writing, with a photo of the damage and a detailed explanation of the problem, to our contact us page within three working days of the products being delivered to you. We have the right to check any returned items before issuing a partial refund, full refund, or product exchange.
- Goods manufactured to your requirements, bespoke, or those that cannot be returned due to their nature.










