Hi Ken - I worked my frozen and semi-frozen hemlock beams in a semi-heated garage. I had no troubles working the beams. For layout, I used a utility knife to get a nice deep score-line. The beams had been cut in Oct and Nov and I was cutting joints from Dec thru May. I noticed very little difference in workability throughout the process, in spite of the fact that the beams varied from hard-frozen to quite warm. Good luck with your project. jekbear