Shingle sealing arrangements
An exemplary shingle includes at least one coated shingle sheet defining a headlap portion and a tab portion each having opposed upper and lower surfaces. A first line of adhesive is adhered to one of the upper surface of the headlap portion and the lower surface of the tab portion, and includes a first thermally activated adhesive material. A second line of adhesive is adhered to one of the upper surface of the headlap portion and the lower surface of the tab portion, and includes a second thermally activated adhesive material having a minimum activation temperature less than a minimum activation temperature of the first thermally activated adhesive material.
1. A shingle system comprising:
at least one overlying shingle comprising at least one coated shingle sheet defining a headlap portion and a tab portion each having opposed upper and lower surfaces;
at least one underlying shingle comprising at least one coated shingle sheet defining a headlap portion and a tab portion each having opposed upper and lower surfaces;
the at least one overlying shingle having a plurality of round dots of sealant applied to the lower surface of the tab portion;
wherein the plurality of round dots of sealant comprise both:
a) round dots of a first sealant formulated to seal at a temperature of less than 70° F., and
b) round dots of a second sealant comprising a thermally activated adhesive having a minimum activation temperature of at least 70° F.;
the at least one underlying shingle having a channel on the upper surface of the headlap portion that is free of sealant;
wherein the plurality of round dots of sealant of the at least one overlying shingle contacts and adheres to the channel of the at least one underlying shingle when the shingle system is installed.
2. The shingle system of claim 1 , wherein the channel comprises a reinforcement material on the upper surface of the headlap portion of the at least one underlying shingle, wherein the reinforcement material is formed from a material selected from the group consisting of: paper, polymer film, scrim material, woven glass, and non-woven glass.
3. The shingle system of claim 2 , wherein the reinforcement material is in the channel.
4. The shingle system of claim 3 , wherein the plurality of round dots of sealant of the at least one overlying shingle contacts and adheres to the reinforcement material in the channel of the at least one underlying shingle.
5. The shingle system of claim 1 , wherein the second sealant comprises a thermally activated adhesive having a minimum activation temperature of 80° F. to 140° F.
6. The shingle system of claim 1 , wherein the plurality of round dots of sealant are arranged in at least a first row of round dots of sealant and a second row of round dots of sealant.
7. The shingle system of claim 6 , wherein the round dots of sealant of the first row are horizontally offset from the round dots of sealant of the second row.
8. The shingle system of claim 1 , wherein the plurality of round dots of sealant are arranged in at least a first row of round dots of sealant and a second row of round dots of sealant, and wherein the round dots of sealant of the first row alternate so that one round dot of sealant of the first row comprises the first sealant and an adjacent round dot of sealant of the first row comprises the second sealant.
9. The shingle system of claim 1 , wherein the thermally activated adhesive of the second sealant is a filled asphalt adhesive comprising an inert material in an amount of 10% to 70% by weight of the filled asphalt adhesive and an antioxidant in an amount of 0.1% to 2% by weight of the filled asphalt adhesive.
10. The shingle system of claim 9 , wherein the minimum activation temperature of the thermally activated adhesive of the second sealant is about 100° F. to about 140° F.