Jiffy Seal Ice & Water Guard HT, made by Protecto Wrap, comes in two versions: a high performance recycled Butyl-Hybrid Adhesive or an even stronger recycled 100-perecent Butyl Adhesive. Your roofers will appreciate the slip-resistant film, which creates an underlayment acceptable for high altitude applications, extreme temperatures and highly conductive roofs. Links:
[1] http://www.protectowrap.com