We offer a 15mm thick engineered oak board which has a 3mm solid oak wear layer. This product may vary slightly in the width that is advertised (between 180mm - 220mm) due to stock availability but this can be advised on application. This engineered oak board is an overlay floor board which is not structural but is an ideal slightly cheaper option than 21mm thick boards and can be installed over an existing floor or by bonding to a level screed.