Spruce decking typically contains small knots which lends to a clean surface appearance, Can be laid either side up, Pressure treated with a copper based wood preservative, giving it a distinctive greenish tone, Tanalith E wood treatment conforms to new European standards & contains no arsenic or chrome, Only sustainable well managed raw materials from PEFC certified sources are used in the production of these B&Q decking products, Should be fixed using 2 screws per joist, joist spacing no more than 600mm centres