To install Trimlux the trim is turned upside down and the trim cavity (a) is slightly overfilled with silicone. The trim is then installed over the joint as shown below.

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When joint movement occurs, the silicone seals and fixes the inner leg solid to the ledge while the semi-flexible outer leg accommodates some degree of joint movement.

Joint movement and lack of durability are the two most frequent causes of leaks. Trimlux accommodates some degree of joint movement through the flexible outer leg. The silicone remains concealed and protected inside the trim, leaving a clean durable joint seal that will not attract slime like exposed silicone usually does in the shower environment.