Abstract: A vent pipe flashing system includes a lower flange, a resilient boot portion and a matching sleeve portion. According to a first embodiment, the lower flange is plastic or metal, the resilient boot portion is plastic or rubber, and the sleeve portion is metal or plastic and has a diameter large enough to slide over the vent pipe and a length about one inch longer than the vent pipe. The top of the sleeve is crimped to hook over the top end of the vent pipe and the bottom of the sleeve is coupled to the boot by crimping. According to a second embodiment, the lower flange includes a metal or plastic roof flange and a rubber gasket having a skirt fixedly seats atop the roof flange. The bottom end of the sleeve portion is crimped over the rubber gasket. The upper ends of the sleeve portion and the vent pipe are covered by a cap having an inverted U-section. According to either embodiment, multiple (telescoping) sleeve portions may be provided and (optionally) coupled to each other by crimping.

Abstract: A roof vent for use in a flat roof having a plurality of layers of roofing material including a waterproof membrane which includes a base flange dimensioned to fit in between two of the plurality of layers of roofing material, an upstanding hollow member coupled to the base flange, an electrical connector mounted mounted on said hollow member, and at least one moisture sensing element electrically coupled to the electrical connector and deployable on one of the plurality of layers of roofing material, wherein the moisture sensing element is in the form of a strip which is deployed like tape. All of the sensing elements are coupled via the electrial connectors of the vents to a central controller which has a display and a modem for signaling an alphanumeric pager of a leak condition.

Abstract: Roof vents include at least one moisture sensing element which is electrically coupled to an electrical connector in the roof vent. The electrical connector is located in the roof vent in such a manner that it is protected from the environment. A portable moisture sensing circuit or device with a moisture display for indicating a degree of moisture is provided with an electrical connector which mates with the electrical connector in the roof vent. According to the invention, the roof vents are installed in a roof system with the moisture sensors located below the roof insulation. When it is time to inspect the roof for leaks, a worker carries the portable device from one roof vent to another and plugs the device connector into the vent connector to take a moisture reading from the sensing element(s) associated with each vent. Since only one electrical circuit and display is used, the total cost of a system having many roof vents is significantly reduced.

Abstract: A roof vent for use on a flat roof incorporating a moisture detector for the early detection of a roof leak. The vent includes a removable cap in which the moisture measuring instrument is located. A sensing element is located within the roof and connected by electrical leads to the measuring instrument. Roof vents incorporating this invention may be arranged in a pattern on the roof to help identify the location of the leak. A radio transmitter may be included in the vents so that the vents may be monitored remotely. Each vent may transmit a distinctive signal to provide the identification of its location.