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NOTE 6: PROPERTY AND EQUIPMENT Weyerhaeuser property and equipment includes land, buildings and improvements, machinery and equipment, rail and truck roads and other items. Carrying Value of Weyerhaeuser Property and Equipment and Estimated Service Lives  SERVICE LIVES AND DEPRECIATION The estimated service lives for Weyerhaeuser property and equipment are: • Buildings and improvements – generally at either the high end or low end of the range from 10 years to 40 years, depending on the type and performance of construction. • Assets we purchase in business combinations – the remaining useful lives of the assets as of the date we acquired them, which is typically shorter than assets we construct or buy new. The maximum service lives for Weyerhaeuser machinery and equipment varies among our operations: • Timberlands – 15 years. • Wood products manufacturing facilities – 20 years. • Primary pulp and paper mills – 25 years. Weyerhaeuser total depreciation expense was: • $859 million in 2007; • $1.2 billion in 2006; and • $1.2 billion in 2005. |