GharExpert Raw Materialhttp://www.gharexpert.com/category/1390/Raw-Material-0.aspx?CatID=1390Purchasing Guidelines for Timberhttp://www.gharexpert.com/articles/Raw-Material-1590/Purchasing-Guidelines-Timber_0.aspx?PL=2&ArticleID=1590&CatID=1390Timber should be of first grade and be free from decay, fungal growth, boxed heart, pitch pocket or streaks on the split