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Sealant Replacement

Adhesive and Cohesive Caulk Failure
New Backer Rod installed into Sealant Joint
New Sealant Installed into Brick Wall
Adhesive and Cohesive Sealant Failure
Installation of New Sealant
New Sealant Joint

A standard part of building maintenance, replacing failed sealants helps buildings maintain a good barrier between the outside elements and the indoor environment.

 

Why Does Sealant Fail?

Sealants expand and compress daily with varying temperature conditions. They are designed for this action, but as they age they lose their elasticity. Eventually they fail and need replacement.

What is the Best Method for Replacing Failed Sealant?

Failed sealants need to be completely removed from the joint. Typically this involves first cutting out the bulk of the old caulking material, and then lightly grinding the surfaces clean to provide a good substrate for the new sealant to bond to. Once the old sealant is completely removed, a closed cell backer rod is inserted into the joint to ensure the new sealant retains the proper joint profile during install. Correct selection of replacement sealant and primer is critical to a successful repair. The substrates are then primed, and the new sealant installed into the joint. Joints are then tooled smooth.

Does Weather Affect Drying Sealant?

Different sealants have different weather requirements for installation, check with the manufacturer to ensure that the weather you intend to install in is safely within the parameters for curing the new sealant.

Are There Any Special Safety Considerations with Replacing Sealants?

Chemicals such as Xylene are often used to clean tools and should be handled with care (skin contact should be avoided). Primers and certain sealants also pose potential health hazards, make sure to read the manufacturers materials and data sheet before handling.

Serving the Twin Cities 7 County Area