The backer rod helps before caulking use the md building products 1 2 in.
Backer rod around tub.
Above the lip of the tub.
Fill the gap between the tile and the tub with caulk.
The vertical portion of the flange will point towards your ceiling while the horizontal part will attach to your tub s edge.
Apply it to the wall with the bottom edge about 1 4 in.
How to use backer rod caulking material step 1.
There should be a small gap between the backerboard and the tub.
Based on your description that when the tub is full of water the joint is less than 1 4 wide i would put in the 1 4 backer rod with the tub full of water and apply the sealant without water in the tub.
Fill the joint with backer rod then caulk with 100 silicone.
Doors and windows are not the only places where heat and conditioned air leakage occurs.
That s the by the book way of treating that joint.
Apply it directly onto the sealant to loosen it.
Any gaps that are wider or deeper than this should use backing material such as this caulk backer rod available on amazon to fill in the gap and allow the caulk to sit securely across the.
Use a putty knife to.
In these photos i used a hydro ban.
Use a cloth and water diluted detergent to scrub.
After you have pushed the backer rod into place apply caulk on both sides of the rod to secure it in place.
In some cases you may need an l shaped tub flange to fill in a gap between the wall and your bathtub.
Caulk backer rod to help fill gaps and openings in pavement cracks wall joints foundations sidewalks and driveways.
The best approach when installing cement board or other tile backer around a tub is to keep the cement board out of the lip area.
First you would waterproof with your favorite liquid waterproofing membrane of choice.
They can be made of several different materials.
There are many places around your house where energy is wasted.
Clean all surfaces to you want the caulking material to adhere.
Probably the simplest way is to caulk the gap with 100 silicone or a urethane sealant.
Then apply a generous amount of thin set to the bottom bathtub tile and position it 1 8 in.
The proper way is to leave a 1 8 inch gap between tile tub.
Remove old sealant with caulk remover.
This is based on the joint being deep enough so you can apply between a 1 8 to 1 4 thick sealant on top if allowed by the sealant manufacturer.