The paper describes the methods used to determine the efficacy of three different water repellent additives in waterborne preservatives. The wooden samples used are pine (Pinus sylvestris) and spruce (Picea abies) that are treated with 9 different waterborne preservatives in retention for hazard class 3 (above ground commodities). There are two sample sizes exposed, cladding boards (19 x 148 mm) with a sawn surface exposed 60 ° facing south, and decking boards (21 x 95 mm2) with a planed surface exposed horizontally. The boards' dimensions have been measured and water repellent properties have been checked three times with water droplets during exposure in 2.5 years. During the winter 1996/1997 and spring 1997 we have logged the temperature and moisture content in eight of the boards for one of the additives; also with and without preservative (CCA). We log every half hour. The RF is also logged. This paper will in addition to describing the methods also give the results after 2.5 years, while a subsequent paper will give the results for the efficacy of the different additives.

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