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If the furring strips have absorbed moisture and you are finding it as far as five feet away then there is a water leak somewhere. It could either be the window itself or possibly the seal around the fiberglass base of the tub.

The tub may just need a bead of clear silicone caulk around the seam to prevent any water intrusion to the wall. The window may just have a very minor leak as well that is accumulating over time. You can run a hose on the outside of the window and have someone watch under the tub to see if any water appears. To test the shower just run some water and see if any droplets appear around this seal as well.

Once the leak issue is fixed, be sure that all of the wood and areas underneath the tub are completely dry prior to closing it up with new drywall. Wet building materials such as wood and drywall will grow mold quickly if it remains continuously wet.

The only time that I have seen water intrusion through a block wall is when there is a sprinkler head spraying continuously on the side of the home. Water seeped into the block and pooled in the open cavities of the cement block.

Feel free to post any follow-up questions you may have.

Expert:	Home Improvement Jay
Pos. Feedback:	98.9 %
Accepts:
Answered:	9/4/2009

General C&ontractor

6 years exp. residential home and pool construction; mold, fire and flood remediations.