At Independent Research we look for situations where there is a comparative advantage which often occurs in similar securities in different markets.     It is worthwhile considering the value in US building products and cement stocks following the Boral acquisition of Headwaters.   We follow about 200 industry sectors in the United States which we rank by market and internal performance.   Right now building products and construction stocks are moving quickly up the ladder but are nowhere near the top ten per cent and are closer to 30 per cent.   The big potential growth for Headwaters is its fly ash concrete infrastructure related business.    Its building products which presently represent about 60 per cent of sales will require attention from Boral to lift the brands and especially its online wholesale presence for contractors.