Roofing grommet forming a seal between a roof-mounted structure and a roof

1. A roof mount assembly for mounting a structure to a roof, the roof comprising at least one rafter and a substrate at least partially covering the at least one rafter, the roof mount assembly comprising:

flashing positionable on the substrate, the flashing defining a first surface, a second surface opposite the first surface and an aperture extending therethrough;

a fastener extending through the aperture;

a bracket coupled to the flashing by the fastener, the bracket being configured to support at least one roof-mounted structure on the roof; and

a seal including a first portion positionable between the first surface of the flashing and the bracket and a second portion positionable to extend through the aperture and between the flashing and the fastener, the seal forming a water-tight seal to inhibit flow of fluid through the aperture,

wherein the flashing includes a frustoconical protrusion substantially surrounding the aperture.

2. The roof mount assembly of claim 1 , wherein the bracket defines a recess configured to receive at least a portion of the frustoconical protrusion of the flashing.

3. The roof mount assembly of claim 1 , wherein the seal includes a first seal member, and wherein the roof mount assembly further comprises a second seal member, the first seal member and the second seal member mating to form the water-tight seal.

4. The roof mount assembly of claim 3 , wherein at least a portion of the first seal member is positioned to abut the first surface of the flashing and at least a portion of the second seal member is positioned to abut the second surface of the flashing.

5. The roof mount assembly of claim 3 , wherein the first seal member has a substantially T-shaped cross-section with the first portion extending across the aperture and the second portion extending at least partially into the aperture.

6. The roof mount assembly of claim 3 , wherein the second seal member has a substantially frustoconical shape engaging the second surface of the frustoconical protrusion.

7. The roof mount assembly of claim 6 , wherein the second seal member has an inner surface abutting the first seal member and an outer surface abutting the frustoconical protrusion.

8. The roof mount assembly of claim 3 , wherein the first seal member includes one of a protrusion and a recess and the second seal member includes a mating one of a protrusion and a recess, the mating protrusion and recess cooperating to retain the second seal member in engagement with the first seal member.

9. The roof mount assembly of claim 1 , wherein the seal has a substantially T-shaped cross-section and extends across the aperture and at least partially into the aperture.

10. The roof mount assembly of claim 1 , wherein the seal includes a first seal member and a second seal member mating to form the water-tight seal.

11. The roof mount assembly of claim 10 , wherein the first seal member is substantially ring-shaped and the second seal member includes a wide portion sized to abut the flashing adjacent the aperture and a narrow portion sized to extend through the aperture.

12. The roof mount assembly of claim 11 , wherein the first seal member includes one of a protrusion and a recess and the second seal member includes a mating one of a protrusion and a recess, the mating protrusion and recess cooperating to retain the second seal member in engagement with the first seal member.

13. The roof mount assembly of claim 1 , further comprising a second bracket coupled to the first bracket by a second fastener, the first-mentioned fastener defining a first longitudinal axis and the second fastener defining a second longitudinal axis offset from the first longitudinal axis.

14. The roof mount assembly of claim 13 , wherein the second bracket is configured to support the roof mounted structure at a distance above the roof.

15. A method of mounting a roof mount assembly to a roof, the roof including at least one rafter and a substrate at least partially covering the at least one rafter, the method comprising:

inserting a seal into an aperture defined in flashing;

positioning the flashing and the seal on the roof;

positioning a bracket on the flashing;

extending a fastener through the bracket, the flashing and the seal and into the at least one rafter;

retaining the bracket, the flashing and the seal on the roof with the fastener;

inhibiting fluid flow through the aperture with the seal;

inserting a protrusion defined by the flashing into a mating recess defined by the bracket.

16. The method of claim 15 , further comprising inserting a second seal member into the protrusion defined by the flashing adjacent the aperture.

17. The method of claim 16 , wherein the seal includes a first seal member and wherein the method further comprises further comprising engaging the first seal member and the second seal member.

18. The method of claim 17 , further comprising retaining the second seal member in the protrusion through the engagement between the first seal member and the second seal member.

19. The method of claim 15 , further comprising coupling a second bracket to the first-mentioned bracket at a location offset from the rafter.

20. The method of claim 19 , further comprising laterally adjusting a position of the second bracket on the first-mentioned bracket with respect to the rafter.

21. The method of claim 19 , further comprising vertically adjusting a position of the second bracket on the first-mentioned bracket with respect to the rafter.

22. The method of claim 19 , further comprising coupling a structure to the second bracket and supporting the structure on the roof.