This probably doesn't help you. But I was thinking of doing a asphalt drive way and running like 6 - 100' 1/2" per loops in it. 6 loops would put me around 1 1/4" line equlivalent. Has anyone tried this before I heard if you want to put pex in asphalt you have to run water through it while the asphalt is cooling or the pex will melt and crush.