The availability of various cylindrical foam products, typically composed of polyethylene, at major home improvement retailers provides a means to control sealant depth and create a backstop during joint sealing applications. These products come in an assortment of diameters, measured in inches or millimeters, catering to different joint widths. For example, a narrow gap may require a 1/4-inch diameter, while wider joints necessitate a 1-inch or larger variant.
Proper joint preparation, which includes using a filler material to achieve the correct sealant depth, is crucial for maximizing the lifespan and performance of the sealant. These flexible foam materials prevent three-sided adhesion, ensuring the sealant only bonds to the sides of the joint, allowing for expansion and contraction without compromising the seal. Utilizing a suitable backer rod helps to reduce the amount of sealant required, leading to cost savings and reducing the likelihood of sealant failure due to excessive strain.
