How to Caulk Large Cracks Around the Bathtub
Installing or repairing a bathtub means you must be certain the joints are sealed all the way around. Failure to completely seal cracks and crevices around the tub will result in water leaking into unprotected areas and could cause problems ranging from a wet floor to rotten flooring and floor joists. If the tub is a new installation, check the corners of the walls around the tub as well, as these seals can be broken during the installation and must be repaired. Does this Spark an idea?
Things You'll Need
- Utility knife
- Caulk
- Caulking gun
- Caulking tool (optional)
- Backer rod
- Spray foam filler (optional)
- Shop rags
- Rounded synthetic sponge
Instructions
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1
Cut the tip off the tube of caulk, and load the fresh tube into the caulking gun. Puncture the seal inside the tip of the tube using a nail, stiff wire or the special puncturing tool built onto many caulk guns.
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2
Insert backer rod into large openings. These foam strips are available in sizes ranging from 3/8 inch to over 1 inch, and should be perfect for most bathroom filler needs. For larger holes, consider using a foam spray filler, but be careful as the foam expands a great deal and could overflow onto your work area if too much is used.
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3
Caulk the joints as you normally would. For large cracks, don't force your caulking into the crevice, but simply form a bead over the crack. Use multiple beads and a caulking tool or piece of scrap lumber to shape the caulk and remove excess.
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4
Allow the caulk to dry for 4 to 6 hours. Using the tip of your utility knife, check that the caulk adhered to all edges and formed a seal. For really large cracks, it may be necessary to repeat the process.
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5
When caulking open cracks, place a bead along each edge of the crack. Allow the caulk to set for 5 minutes, and apply a third bead over the first two. Use the damp sponge to shape and remove excess caulk.
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Tips & Warnings
How much pressure you apply to the trigger-grip will control the flow of caulk. In most cases a slow steady flow is better than a steady, fast stream.
You cannot stain or paint all types of caulk. Make sure to select the right type of caulk for the job you are performing.
