There is a little dry rot to the subfloor but not much. Before applying new grout ensure tiles are firmly adhered and that the gaps in between are clean.
Starting low on the wall splash or spray water on an isolated area and keep checking for leaks as you work your way up a couple of feet at a time.
Water leaking through gaps in bathroom tile grout. The joist beams are fine no rot. In the picture below the shower hasn t been used in over 24 hours and the rest is completely dry except for two other similar spots on the grout. They may have waterproofed the underlying deck but they could have made mistakes.
There should be proper flashing the membrane should be sloped to a drain that has weep holes to allow the water through. This has caused water to leak out through the subfloor. Answer answer if water from your shower is leaking into a crawl space the problem is not the cementitious grout joints.
If it is leaking then it isn t fully waterproof. To stop the leak and prevent further damage to the underlying plaster. I have water seeping from the grout where the wall of my shower meets the floor.
Cracks in the grout between tiles in your tub or shower area can allow moisture to seep through and stain the ceiling below. Technically as long as grout on a wall shows no sign of cracking or missing spots then water should not leak through even if it is not sealed at all. If so do the tiles need any.
Tiles are a popular choice for a bathroom floor as they tend to stand up very well in a wet environment but in spite of their resistance to water water damage to tiles can still occur over time. The grout joints are porous so water can go through the grout and under the tile. Although grout is porous not to the point that you will actually have water leak through solid grout especially since on a wall it only has short term exposure until the water runs down.
There has to be an underlying problem with the shower pan s waterproof membrane. Understanding the causes of water under a tile floor can help you to better deal with the issue at hand. The tile is travertine in case that s relevant.
Ensure a smooth even finish is created with no gaps which could cause further problems down the line. A squeegee or rubber float can then be used to apply water resistant grout in small sections. The shower has been unused for a few days drying out.
To do this focus on one wall at a time. Is there a product i can put in the missing grout gaps that will seal everything and prevent future leaks. To waterproof a shower pan and shower walls you have to have a waterproof membrane that meets ansi a118 10 to be properly installed.
There is a shower curtain. It likely was not installed correctly. I think the water is leaking from between the tiles or the sealant around the bath joint as the original installer might not have applied water proof grouting or silicone.
If the shower drains and there is no leak then you will need to examine whether the leak is coming from missing grout between tiles on the shower walls. Now do i re tile or re grout with the latter with quality water proof silicone and grouts.