The biggest mistakes Washougal homeowners make with tile usually come down to what happens under the surface, from skipping proper waterproofing to ignoring floor prep. Getting tile right means understanding how moisture and subfloors behave over time so you do not end up paying for costly teardowns later. Here is a look at what we see go wrong on jobs across Washougal, WA, and how a solid installation prevents these issues.
SKIPPING PROPER WATERPROOFING BEHIND SHOWER TILE
Tile and grout are not waterproof on their own. Water passes through grout joints, and if there is no barrier behind the tile, moisture works its way directly into the wall studs and subfloor.
We often tear out showers where tile was installed directly over ordinary cement board without a dedicated waterproofing layer. Over time, that moisture rots framing and causes hidden mold. Proper shower installation requires liquid-applied or sheet waterproofing behind the tile. For example, using HydroBlock waterproofing for shower wall prep runs $18 per square foot, while RedGard prep runs $15 per square foot. Taking that step keeps water strictly inside the drainage system where it belongs.
IGNORING SUBFLOOR PREP BEFORE LAYING FLOOR TILE
Laying tile on an uneven subfloor leads to cracked tiles, popped grout, and noticeable edges where one tile sits higher than the next. Many homeowners assume thinset mortar will level out a dip in the floor, but mortar shrinks as it cures, pulling the tile down with it.
Before laying floor tile, the subfloor needs to be flat and structurally sound. Floor preparation costs around $3 per square foot to clean, level, and patch the surface properly. Taking time to prep means standard floor tile, like 12 to 36 inch tiles at $17 per square foot, lies completely flat and stays solid for decades.
USING STANDARD GROUT IN HEAVY MOISTURE AREAS
Cement-based grout is porous. In shower floors or entryways near the Columbia River Gorge where wet shoes track in moisture, porous grout absorbs dirt, stains, and breaks down over time.
Upgrading to epoxy grout solves this problem because epoxy is completely non-porous and stain-resistant. An epoxy grout upgrade adds $6 per square foot to new tile work. If you already have failing grout on a bathroom floor, standard regrouting runs $8 per square foot, but starting with epoxy on new installations avoids future repairs entirely.
NEGLECTING EXPANSION JOINTS AND FLEXIBLE CAULK
Houses move, especially in our climate where seasons bring shifts in humidity and temperature. Where tile meets a tub, ceiling, or adjacent wall, the joint must allow for slight movement.
Filling these corners with rigid grout causes the joint to crack within months. A good install uses 100 percent silicone caulk matched to the grout color in all change-of-plane joints. When old caulk fails and breaks its seal, tub or shower re-caulking costs $250 per job to strip out the old material, clean the seam, and apply a fresh, waterproof seal.
CHOOSING TILE SIZES WITHOUT CHECKING THE LAYOUT
It is easy to pick a tile pattern from a showroom board without thinking about how it fits your specific room layout. For instance, installing large format tiles in a small bathroom with tight corners leads to awkward sliver cuts along the walls.
On the flip side, classic options like subway tile at $22 per square foot offer clean proportions that fit almost any wall, but still require careful layout planning around outlets and niches. A professional installer maps out the center lines first to make sure cut pieces are equal on both sides of the room. You can read more about project planning on our blog.
COMMON QUESTIONS
Can you tile directly over old vinyl or existing tile?
We do not recommend tiling over existing flooring. Old vinyl or tile can hide moisture, rot, or soft subfloors, and adding a second layer creates awkward height transition issues at doorways.
What is the best way to clean and care for new tile grout?
Use a pH-neutral cleaner and avoid harsh bleach or acid products that strip away sealant. Sealing standard cement grout regularly helps prevent stain absorption.
How do I know if my shower is leaking behind the wall?
Look for cracked grout along the floor joint, squishy drywall outside the shower curb, or persistent musty smells. If you notice these signs, our team offering tile services in Washougal can inspect the shower and quote repairs.
If you are planning a project, you can learn more about our full tile services or schedule a time for us to take a look. We offer free in-home estimates and provide a written price the same day we visit your home. Visit Buddy Tile to set up a time for our crew to drop by.