Backer Rod

Backer Rod is an easy to compress rope-like celled foam. It is inserted into a clean joint at the required depth before caulking/sealing. Backer Rod creates an even depth and supports the sealant / caulk allowing it to form the proper shape (about 2x as wide as deep).

AVAILABLE IN 1/4" UP TO 6" DIAMETER

What Size Backer Rod? Select a Backer Rod diameter that is about 30% larger than the nominal width of the joint (but not less than 10% of the largest gap). See table at the bottom of this page.

Click here to download Backer Rod Submittal Form


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What Size Backer Rod you you need?

Joint Width
Backer Rod Diameter

1/8”- 3/16”

1/4"
3/16" -1/4"
3/8"
1/4" - 3/8" 1/2"
3/8" - 1/2"
5/8"
1/2" - 5/8"
3/4"
5/8" - 3/4" 7/8"
3/4" - 7/8"
1"
7/8" - 1"
1 1/4"
1" - 1-1/4"
1 1/2"
1 1/4" -1 1/2"
2"
1 1/2" - 2"
2 1/2"
2 - 2 1/2"
3"
2 1/2" - 3"
4"