Installing a subway tile backsplash can add a classic, timeless look to your kitchen or bathroom. When installing subway tile, using the right trowel is key to getting full coverage and adhesion of the tiles. Here is a detailed guide on what size trowel to use when installing subway tile for your backsplash.
Introduction
When installing subway tile for a backsplash, choosing the right trowel is one of the most important steps. The trowel is used to spread the tile adhesive or thinset mortar that allows the tiles to stick to the wall surface. The trowel leaves ridges and valleys in the adhesive that allow the tile to be pressed into the mortar and achieve full coverage. Using the right sized trowel ensures proper coverage and a long-lasting installation.
The general recommendation is to use a trowel sized one size larger than the subway tile you are installing. So for standard 3×6 inch subway tiles, a 1/4 x 3/8 inch square-notched trowel is ideal. Going up a size from the tile creates the proper bed thickness and coverage ratio.
Below we will look at the factors to consider when choosing a trowel size, the common trowel sizes used, and tips for achieving proper coverage for subway tile backsplashes.
Factors to Consider For Choosing Trowel Size
- Tile size – The most important factor. Choose a trowel one size larger than the tile.
- Tile material – Lighter tiles like foam or plastic may need a smaller notch size. Natural stone and glass tile warrant a larger notch.
- Surface material – Drywall can use a smaller notch size versus cement board or plaster walls.
- Type of adhesive – Check adhesive specs for recommended trowel size. Latex modified thinset allows for a smaller trowel.
- Surface flatness – Any uneven areas may require a thicker adhesive layer with a larger trowel.
Consider all of these factors when selecting the optimum trowel for your subway tile project.
Common Trowel Sizes for Subway Tile
Here are the trowel sizes commonly used with standard subway tiles:
- 3×6 inch subway tile – Use a 1/4 x 3/8 inch square-notched trowel
- 4×8 inch subway tile – Use a 1/4 x 1/2 inch square-notched trowel
- 6×6 inch subway tile – Use a 1/4 x 1/4 inch square-notched trowel
- Mini subway tiles – Use a 1/8 x 1/8 inch square-notched trowel
These are general guidelines – always check the tile manufacturer’s recommendations too. Choosing the right trowel size prevents thin spots, full adhesion coverage, and a long-lasting installation.
Achieving Proper Coverage
To obtain proper adhesive coverage, it is important to apply the thinset mortar evenly across the surface and consistently at the recommended depth.
Here are some tips for achieving full coverage:
- Hold the trowel at a 45° angle to the wall surface when applying adhesive.
- Apply firm pressure when combing the thinset to leave uniform ridges.
- Use the flat side of the trowel to knock down high spots and even out the adhesive.
- Allow thinset to slake or sit for 10-15 minutes before installing tile.
- Make sure tile is fully embedded into the adhesive ridges.
- Use a grout float to check for thin spots if needed.
- Follow open times for the adhesive product.
Proper troweling technique leads to a quality tile installation that lasts for years to come.
What Size Trowel for Subway Tile Backsplash
In summary, for a standard 3×6 inch subway tile backsplash, a 1/4 x 3/8 inch square-notched trowel is recommended. This provides the right adhesive depth for the tile size. Matching the trowel size to one size larger than the tile ensures good coverage and adhesion.
Factors like tile material, wall surface, and flatness should also be taken into account when selecting the trowel. Follow the manufacturer’s recommendations for the thinset mortar as well. With the right trowel size and proper troweling techniques, you can achieve a successful and long-lasting subway tile backsplash.
Frequently Asked Questions
What size notch trowel should be used for 4×4 inch subway tile?
For 4×4 inch subway tiles, use a 1/4 x 1/4 inch square-notched trowel. Going up one size from the tile dimensions creates the proper adhesive bed thickness.
Should I use a 1/4 or 1/2 inch trowel for standard subway tiles?
The most common trowel size for standard 3×6 inch subway tiles is a 1/4 x 3/8 inch square-notched trowel. This provides the right adhesive coverage for that size tile. A 1/2 inch trowel may create too thick of an adhesive layer.
Can I use a smaller trowel on cement board?
It is recommended to use the same size trowel on cement board as you would on drywall. Cement board has a rougher surface and warrants sufficient adhesive coverage, so don’t go smaller than the standard trowel for your tile size.
What if my tiles are not laying flat, do I need a larger trowel?
If tiles are not sitting flush to the wall, it likely means there are thin spots in the adhesive coverage. Go up one size on the trowel notch to allow for a thicker adhesive layer. Be sure to apply adhesive consistently at the proper depth.
How important is it to use the right trowel size?
Using the manufacturer recommended trowel size for the specific tile you are installing is very important. The proper trowel size ensures you achieve full mortar contact and proper adhesion. This prevents tiles from loosening, cracking, or popping off over time.
Conclusion
Choosing the optimal trowel size makes a big difference in successfully installing subway tile backsplash. Matching the trowel size to one notch size larger than the tile dimensions provides the proper adhesive thickness. Factors like tile material, wall surface, and adhesive type should also be considered when selecting a trowel. With the right trowel and proper technique, you can create a stunning, long-lasting subway tile backsplash.