Liquid applied roofing formulations and methods of using the same to coat at least one steep slope roof substrate

A method comprising:

• obtaining a base formulation comprising:
• at least one flame retardant;
• at least one acrylic polymer;
• and
• water;
• wherein the base formulation has a viscosity of 10,000 cP or less measured according to ASTM D2196 using a RV3 viscometer spindle at 50 rpm and 23° C.;
• obtaining an activator formulation;
• mixing the base formulation with the activator formulation, so as to result in a liquid applied roofing formulation;
• applying the liquid applied roofing formulation to at least one steep slope roof substrate;
• and
• solidifying the liquid applied roofing formulation, so as to form at least one coating layer on the at least one steep slope roof substrate,
• wherein, when the liquid applied roofing formulation is tested as a solidified single coating layer at a thickness of 30 mil on the at least one steep slope roof substrate for fire resistance and nail sealability, the liquid applied roofing formulation:
• a) passes the Class A UL790 fire resistance test;
• and
• b) passes the ASTM D1970 nail sealability test.