This Old House landscaping contractor Roger Cook shows how to construct a wood-timber retaining wall to create a play area. (See below for a shopping list and tools.) SUBSCRIBE to This Old House: http://bit.ly/SubscribeThisOldHouse Shopping List for How to Build a Timber Retaining Wall: - 1x3 wood stakes [https://amzn.to/2M18dFg] and nylon string [https://amzn.to/2HBw0GJ], used to…