Which softwood is knotty and durable when treated, used for general woodwork, cupboards, shelves and decking?

• A. Redwood
• B. Elm
• C. Spruce
• D. Walnut

Answer: (A)

Redwood is a knotty softwood that becomes durable when treated with preservatives, making it suitable for both interior woodwork and outdoor use like decking. Its natural resistance to decay, plus its ability to accept finishes well, means cupboards and shelves can be built from it and still hold up outdoors where needed. The knotty appearance is a common characteristic of redwood, giving a warm, rustic look that many builders and designers seek. Spruce lacks durability for outdoor use, elm is a different hardwood with other properties, and walnut is a dense hardwood with fewer knots and is typically used for high-end furniture rather than knotty decking. So redwood best fits the description.