18mm OSB 3 is a strong, versatile board suitable for structural use in humid conditions, ideal for applications such as roofing, flooring, hoarding, wall sheathing and formwork etc. Made up in 3 layers, 18mm OSB is cross orientated to give maximum strength and bonded under pressure with a waterproof resin.

Our OSB is SterlingOSB Zero OSB3, a precision-engineered OSB3 board for structural use in load bearing and challenging conditions. It performs well in humid conditions, making it ideal for house building and construction. BBA approved, it now contains zero added formaldehyde.

When used externally all OSB faces and edges should be treated with an appropriate preserver

Applications include:
Wall sheathing
Flooring & roofing applications
Roof decking
Site hoarding
Sarking applications
GRP roofing applications
Garden Sheds
Interior decoration

Zero added formaldehyde
CE/CPD compliant as "fit for purpose"
Versatile OSB panel
Complies to BS EN 300
Moisture resistant
Precision engineered 18mm OSB panel has no knots or voids
High load-bearing capacity

We deliver local and nationwide any day except Saturdays, Sundays and Bank Holidays.

We will contact you via text the evening before with a 90-minute timeslot for your delivery, so you can plan your day.

If your order is within our designated area, then we will deliver it for FREE NEXT DAY (subject to availability and minimum order value).

Click here for our delivery areas and charges.

Check for Free Delivery

Returns and Refunds Policy

In the unlikely event that a delivered product is faulty or damaged, we will exchange it or provide you with a full refund, as long as we are notified of the product’s fault within 48 hours of it being delivered to you.

Champion Timber shall not accept on return for credit any goods ordered from Champion Timber incorrectly or subsequently found to be surplus to the customer’s requirements. The suitability of specialist goods is assumed to have been assessed by the customer or his/her advisor(s) prior to purchase. Champion Timber shall endeavour to assist customers where possible by accepting at a reasonable restocking charge the return of goods (together with the original packing if applicable) which are from Champion Timber normal stock lines but goods ordered from the manufacturer cannot be accepted without Champion Timber prior agreement for the return and Champion Timber restocking charges having been paid. In any event, credit cannot be given unless the customer provides Champion Timber with the number of the invoice on which the goods were supplied.

View our full Returns and Refunds Policy.