Moisture detection sensors for building structures comprising tape with two conductors and moisture probes piercing tape and structure

A method of detecting moisture in an absorbent material comprises providing a tape formed by a substrate of dielectric, hydrophobic material, a layer of a mounting adhesive on a bottom surface of the substrate and a first and a second spaced apart, elongate, parallel conductors mounted on a top surface of the substrate and extending therealong. The tape is attached by the adhesive on to a surface of the absorbent material so as to mount the first and second conductors on or adjacent the surface of the absorbent material and the first and second conductors of the tape are penetrated with a respective one of a pair of conductive probes such that each of the conductive probes engages into the absorbent material and is electrically connected to the respective conductor. A voltage is applied across the first and second conductors; and the currents passing between the first and second conductors are monitored so as to detect changes in resistance between the first and second conductors caused by moisture in the absorbent material.