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Damaged Tile Backing

 
 

In the picture above, I'm not focusing in on the wood rot in the wood window sill but would like you to look at the building paper or black paper that is damaged.

If you ever take the time to read the specifications on most building protection membranes or building paper, most of the time it will refer to the paper as water resistant. Water resistant paper is not the same as waterproof.

This paper is made from biodegradable material and will not provide you with a waterproof protective membrane.

If the bath tub surround is built properly, the building paper will not get saturated with moisture and will provide you with good protection. Saturated building paper over time will start to disintegrate, causing problems eventually.