IS 6 what Buffets calculator gives you? Have you done a check on ALU, A2M, and NXT? What's your IVM for those? If you're gona use book value in conjection with a 10 yr bond yield, then you're looking really long term averaged out. I look short term 2 - 6 months myself.
A simpler method is to pull up a 200ema For BLD its about $7.20. ASX in bull mode, and construction industry strong here and in the USA, financials are good overall.
What did you pay ? $8? Hang around it will come again.