While caulk alone can be applied to narrow cracks gaps wider than 1 4 should be filled with foam backer rod first.
Backer rod for caulking tub.
The backer rod helps cushion and insulate and helps prevent 3 point bonding.
Fill very deep or very wide gaps up to 6 inches with a backer rod before applying the caulk.
Caulk backer rod to help fill gaps and openings in pavement cracks wall joints foundations sidewalks and driveways.
The backer rod should be larger than the joint and be compressed into it.
The sealant cannot be applied too thick or too thin for it to perform correctly.
Remove old sealant with caulk remover.
Use a cloth and water diluted detergent to scrub.
Clean all surfaces to you want the caulking material to adhere.
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Use a putty knife to.
Backer rods are usually round flexible lengths of foam that are used as a backing in joints or cracks to help control the amount of sealant caulking used and create a back stop.
Before caulking use the md building products 1 2 in.
Backer rods are flexible foam tubes of different densities.
They can be made of several different.
How to use backer rod caulking material step 1.