Anti-slip roofing underlayment

A roofing underlayment comprising:

• a reinforcing layer comprising:
• an upper surface anti-slip coating layer comprising:
• a core layer;
• and
• a skin layer;
• and
• a lower surface anti-slip coating layer;
• and wherein the reinforcing layer comprises a woven polypropylene scrim;
• the core layer comprising 1% U.V. stabilizer, 10% Beige pigment, 8% low density polyethylene, and 81% homo-polymer polypropylene;
• and wherein the skin coating layer comprises 2% UV stabilizer, 10% Beige pigment, 8% anti-block, 10% homo-polymer polypropylene, and 70% S-E/B-S block copolymer compound comprising about 30-75% by weight styrene-ethylene/butylene-styrene, about 0%-50% by weight resin, and about 0.1%-2% by weight antioxidant/stabilizer/dusting agent;
• and wherein the lower coating layer comprises 73.5% thermoplastic olefin resin, 8.0% low density polyethylene, 2% UV stabilizer, 10.5% white masterbatch, and 6% anti-block;
• wherein the core layer and the skin layer are coextruded onto the scrim, and wherein the core layer comprises 70% by weight of the upper coating layer and the skin layer comprises 30% by weight of the upper coating layer.