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An IG unit includes a perimeter structure having a port, a first pane supported by the perimeter structure, a second pane supported by the perimeter structure opposite the first pane with an interior space defined between the first and second panes that is sealed and connected to the port, and a mem

An IG unit includes a perimeter structure having a port, a first pane supported by the perimeter structure, a second pane supported by the perimeter structure opposite the first pane with an interior space defined between the first and second panes that is sealed and connected to the port, and a membrane valve assembly adapted to act as a self-sealing access to the port. The membrane valve assembly optionally includes a first sealant layer, a second membrane layer, and a third sealant layer, for example.

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1. A membrane valve assembly for an insulated glass (IG) unit having a port into an interior space of the IG unit, the membrane valve assembly being adapted to be substantially self-sealing following puncture to access the port, the membrane valve assembly comprising: a first sealant layer of butyl

1. A membrane valve assembly for an insulated glass (IG) unit having a port into an interior space of the IG unit, the membrane valve assembly being adapted to be substantially self-sealing following puncture to access the port, the membrane valve assembly comprising: a first sealant layer of butyl polyisobutylene having a first thickness and a first durometer;a second membrane layer of chlorobutyl elastomer rubber over the first sealant layer, the second membrane layer having a second thickness substantially greater than the first thickness and a second durometer from about 35 A to about 50 A, the second membrane layer being substantially harder than the first sealant layer; anda third sealant layer over the second membrane layer that is substantially softer than the second membrane layer. 2. The membrane valve assembly of claim 1, wherein the third sealant layer is a butyl polyisobutylene sealant. 3. The membrane valve assembly of claim 1, wherein the second membrane layer has a thickness of from about 0.01 inches to about 0.032 inches. 4. A method of manufacturing an insulated glass (IG) unit for installation at an installation site, the insulated glass (IG) unit including a perimeter structure having a port a first pane supported by the perimeter structure; a second pane supported by the perimeter structure opposite the first pane with an interior space defined between the first and second panes that is sealed and connected to the port; a membrane valve assembly adapted to act as a self-sealing access to the port, the membrane valve assembly being arranged to block the port and including a first sealant layer that is substantially tacky, the first sealant layer being secured to the perimeter structure; a second membrane layer over the first sealant layer and secured to the perimeter structure by the first sealant layer, the second membrane layer having a second durometer of from about 35 A to about 50 A; and a third sealant layer over the second membrane layer, the third sealant layer being substantially softer than the second membrane layer, the method comprising: forming the port into the perimeter structure;blocking the port with the self sealing membranearranging the first pane opposite a second pane and sealing a space between the first and second panes to define the interior space of the IG unit;puncturing the self sealing membrane with a gas probe and modifying an amount of gas in the IG unit; andremoving the probe and allowing the self sealing membrane to close such that the interior of the IG unit is substantially re-sealed. 5. The method of claim 4, wherein gas is initially sealed in the interior of the IG unit at a manufacturing site at an initial pressure that is higher than a desired internal pressure and further wherein modifying the amount of gas in the IG unit includes puncturing the self sealing membrane with the gas probe and removing gas from the interior such that the IG unit exhibits the desired internal pressure after the IG unit is substantially re-sealed. 6. The method of claim 5, wherein the IG unit is manufactured at a manufacturing site having an atmospheric pressure that is substantially different from an atmospheric pressure at the installation site and further wherein the desired internal pressure is pre-selected according to the atmospheric pressure at the installation site of the IG unit. 7. The method of claim 6, wherein the difference between the atmospheric pressure at the installation site and the manufacturing site is about 0.15 bar or greater. 8. The method of claim 4, further comprises preconditioning the second membrane layer with a pre-bake. 9. The method of claim 4, further comprising disposing a secondary sealant about the perimeter of the IG unit. 10. The method of claim 4, wherein the space between the first and second panes is sealed to define the interior space of the IG unit after the port is formed in the spacer system. 11. An insulated glass (IG) unit comprising: a perimeter structure having a port;a first pane supported by the perimeter structure;a second pane supported by the perimeter structure opposite the first pane with an interior space defined between the first and second panes that is sealed and connected to the port;a membrane valve assembly adapted to act as a self-sealing access to the port, the membrane valve assembly being arranged to block the port and including: a first sealant layer that is substantially tacky, the first sealant layer being secured to the perimeter structure;a second membrane layer over the first sealant layer and secured to the perimeter structure by the first sealant layer, the second membrane layer having a second durometer of from about 35 A to about 50 A; and a third sealant layer over the second membrane layer, the third sealant layer being substantially softer than the second membrane layer. 12. The IG unit of claim 11, wherein the second membrane layer is a chlorobutyl elastomer rubber. 13. The IG unit of claim 11, wherein the first and third sealant layers are butyl polyisobutylene sealants. 14. The IG unit of claim 13, further comprising a fourth protective layer of a silicone over the third sealant layer. 15. The IG unit of claim 11, wherein the first and third membrane layers each have a durometer from about 10 A to about 30 A. 16. The IG unit of claim 11, wherein the second membrane layer has a thickness from about 0.025 to about 0.045 inches. 17. The IG unit of claim 11, wherein the second membrane layer has a thickness from about 0.038 inches to about 0.042 inches. 18. The IG unit of claim 11, wherein the third sealant layer has a thickness of from about 0.01 inches to about 0.032 inches. 19. The IG unit of claim 11, wherein the first sealant layer and the second membrane layer are preformed as a tape material that is subsequently applied to the perimeter structure. 20. The IG unit of claim 11, wherein the second membrane layer is adapted to be self-sealing following puncture by a gas probe having an effective diameter of about 0.032 inches. 21. A membrane valve assembly for an insulated glass (IG) unit having a port into an interior space of the IG unit, the membrane valve assembly being adapted to be substantially self-sealing following puncture to access the port, the membrane valve assembly comprising: a first sealant layer of butyl polyisobutylene having a first thickness and a first durometer;a second membrane layer of chlorobutyl elastomer rubber over the first sealant layer, the second membrane layer having a second thickness substantially greater than the first thickness and a second durometer from about 35 A to about 50 A, the second membrane layer being substantially harder than the first sealant layer; anda third sealant layer over the second membrane layer and having a third thickness that is substantially less than the second thickness and being substantially softer than the second membrane layer.