We own a post and beam built in 1987. The beams were green pine sealed with linseed oil and thinner. We have a house ventilation system which we use in the winter to solve moisture problems but in the summer we keep the windows open. For the last several years we have had an increasing mildew problem (the previous owners who built the house will not admit to having the same problem). The mildew only shows on the beams; the walls and woodwork are clear of mildew. The wall have paint and the woodwork is stained and sealed with poly. What we would like to know is why we have this problem and what we can do to solve it. I am hoping that the guild members (who have been tremendous with past roof problems)will have some advice. Is the lineseed oil causing the problems? Is there some product that works particularly well? I have tried a 10/1 mixture of bleach.

Anne