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An improved method of installing a closet flange allows installation of plumbing fixtures with a reduced likelihood of leaks. The method involves telescopically fitting an inner or outer surface of a drainpipe to a surface of a cylindrical portion of a hub of a closet flange, where the hub has a bas

An improved method of installing a closet flange allows installation of plumbing fixtures with a reduced likelihood of leaks. The method involves telescopically fitting an inner or outer surface of a drainpipe to a surface of a cylindrical portion of a hub of a closet flange, where the hub has a base flange extending therefrom; and securing the base flange against the upper surface of a subfloor. A first layer of sealant is applied to an upper surface of the base flange; and a flooring membrane is secured to the upper surface of the base flange by the first layer of sealant. A second layer of sealant is applied to an upper surface of the flooring membrane; and the upper surface of the flooring membrane is clamped between the base flange and a clamping ring. The method may be performed using a two-part closet flange for connection to a drain pipe for a toilet. The two-part closet flange comprises a cylindrical hub adapted to telescopically connect to the drain pipe; an annular flange radially extending from the cylindrical hub; a clamping ring; and a means to clamp a flooring membrane between the clamping ring and the annular flange.

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1. A method of connecting a closet flange to a drainpipe extending through a subfloor, said method comprising: providing a closet flange having (i) a hub comprising a first cylindrical portion, and (ii) a base flange extending from the hub;telescopically connecting the first cylindrical portion to t

1. A method of connecting a closet flange to a drainpipe extending through a subfloor, said method comprising: providing a closet flange having (i) a hub comprising a first cylindrical portion, and (ii) a base flange extending from the hub;telescopically connecting the first cylindrical portion to the drainpipe;securing the base flange of the closet flange against a surface of the subfloor;securing a flooring membrane to an upper surface of the base flange; andclamping the flooring membrane between the base flange and a clamping ring. 2. The method of claim 1, wherein the step of securing the flooring membrane comprises: applying a first layer of sealant to the upper surface of the base flange; andattaching the flooring membrane to the first layer of sealant. 3. The method of claim 2, additionally comprising: applying a second layer of sealant to an upper surface of the flooring membrane prior to the step of clamping;wherein, after the step of clamping, the flooring membrane is positioned between the first layer of sealant and the second layer of sealant. 4. The method of claim 1, wherein the base flange extends from the first cylindrical portion. 5. The method of claim 1, wherein the base flange extends from a second cylindrical portion of the hub. 6. The method of claim 5, wherein the second cylindrical portion of the hub is coaxial with the first cylindrical portion of the hub. 7. The method of claim 1, wherein the base flange extends from a second cylindrical portion of the hub, the second cylindrical portion being fluidly connected with the first cylindrical portion of the hub. 8. The method of claim 3, wherein the step of clamping comprises: positioning the clamping ring on the second layer of sealant, and securing the clamping ring to the subfloor. 9. The method of claim 3, wherein the step of clamping comprises: positioning the clamping ring on the second layer of sealant, and securing the clamping ring to the subfloor with a threaded fastener passing through the base flange. 10. The method of claim 3, wherein: a) the first cylindrical portion is below the base flange and the hub further comprises a second cylindrical portion above the base flange, the second cylindrical portion having an external surface with a first threaded joint;b) the clamping ring has an internal surface with a second threaded joint; andc) the step of clamping comprises screwing the second threaded joint onto the first threaded joint until the clamping ring contacts the second layer of sealant. 11. The method of claim 1, wherein the step of securing the base flange of the closet flange against the upper surface of a subfloor comprises: a) applying a layer of sealant to the subfloor;b) fitting a sealant dam to an inner peripheral edge of a lower surface of the base flange; andc) securing the base flange to the subfloor through the layer of sealant. 12. The method of claim 1, wherein the step of securing the base flange of the closet flange against the upper surface of a subfloor comprises: a) applying a layer of sealant to the subfloor;b) fitting a sealant dam to an annular recess in a lower surface of the base flange; andc) securing the base flange to the subfloor through the layer of sealant. 13. A method of fitting a closet flange to existing construction having a finished floor, comprising: providing a closet flange having a hub with a base flange extending from the hub, the hub having a first cylindrical portion;fitting a sealant dam to an inner peripheral edge of a lower surface of the base flange;telescopically fitting a surface of the cylindrical hub to an inner or outer surface of a drainpipe passing through a hole in the finished floor;applying a layer of sealant to an upper surface of a finished floor; andsecuring the base flange to the finished floor or flooring membrane through the layer of sealant, wherein the sealant dam prevents sealant from entering the hole in the finished floor. 14. A closet flange for connection to a drain pipe, comprising: a hub having a first cylindrical portion, the first cylindrical portion being adapted to telescopically connect to the drain pipe; anda clamp assembly comprising an annular flange radially extending from the hub; and a clamping ring;wherein the clamp assembly is adapted to clamp a flooring membrane between the clamping ring and the annular flange. 15. The closet flange of claim 12, wherein the annular flange extends from the first cylindrical portion of the hub. 16. The closet flange of claim 12, wherein the annular flange extends from a second cylindrical portion of the hub, wherein the first cylindrical portion and the second cylindrical portion are coaxial. 17. The closet flange of claim 12, wherein the base flange extends from a second cylindrical portion of the hub. 18. The closet flange of claim 12, further comprising a bolt, wherein the bolt secures the clamping ring and the annular flange to a subfloor, the flooring membrane being between the clamping ring and the annular flange. 19. A closet flange according to claim 12, further comprising: a first threaded surface on an interior surface of the clamping ring;an annular flange radially extending from a lower edge of the clamping ring; anda second threaded surface on an exterior surface of the hub, the second threaded surface extending above the annular flange radially extending from the cylindrical hub;the first threaded surface being adapted to screw onto the second threaded surface so as to clamp a flooring membrane between the annular flange radially extending from a lower edge of the clamping ring and the annular flange radially extending from the cylindrical hub. 20. A closet flange seal for connection to a drain pipe, comprising: a hub having a first cylindrical portion, the first cylindrical portion being adapted to telescopically connect to the drain pipe; and an annular flange radially extending from the hub;a clamping ring; anda means for clamping a flooring membrane between the clamping ring and the annular flange. 21. A closet flange seal according to claim 18, wherein the clamping means comprises a bolt securing the clamping ring and the annular flange to a subfloor. 22. A closet flange seal according to claim 18, wherein the clamping means comprises: a first threaded surface on an interior surface of the clamping ring;an annular flange radially extending from a lower edge of the clamping ring; anda second threaded surface on an exterior surface of the hub, the second threaded surface extending above the annular flange radially extending from the cylindrical hub;the first threaded surface being adapted to screw onto the second threaded surface so as to clamp a flooring membrane between the annular flange radially extending from a lower edge of the clamping ring and the annular flange radially extending from the cylindrical hub. 23. A closet flange seal according to claim 18, wherein the clamping means comprises: a first threaded surface on an exterior surface of the clamping ring;an annular flange radially extending from an upper edge of the clamping ring; anda second threaded surface on an interior surface of the hub;the first threaded surface being adapted to screw onto the second threaded surface so as to clamp a flooring membrane between the annular flange radially extending from an upper edge of the clamping ring and the annular flange radially extending from the cylindrical hub.