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Scott Weston Architecture Design PL I always try to incorporate natural light and ventilation in bathrooms to prevent that very thing MOULD!
As long as you waterproof around the window and fit the appropriate window sill and tile you should never have an issue.

John Whipple - By Any Design ltd. When building a shower with a window it is important to consider a few points....

1). Thermal movement (season change and temperature will cause the window to expand and contract. You can not grout right tight to the window and the backer boards and waterproofing products need flexibility.

2). The window sill needs to be sloped to the shower so it does not hold water. 1/4" over a foot or 1/8" over 6" or 1/16" over 3" is all it takes to keep the sill dry.

3). I like tying in the waterproofing to a non-wood window. Try using Kerdi Fix and KErdi Band as a good starting point.

JW

John Whipple - By Any Design ltd. I recently documented this process quite closely. I'll prepare a new ideabook so I can showcase some more of these points- more clearly.

JW

cbonar Scott and John, thank you for the replies. John, I am looking forward to seeing your new ideabook with the finer details. I hope to start planning my bath reno in the next month so your guidance would be greatly appreciated! Thanks again!