Insert Backer Rod and Introduce Sealant

What happens here

The video demonstrates the physical insertion of the backer rod into a vertical gap between siding panels and a corner trim piece. The backer rod should be compressed and pushed into the gap to a depth that allows the sealant to have an optimal thickness-to-width ratio, typically ensuring the sealant depth is about half its width, but no less than 1/4 inch. This practice is crucial for large gaps as it prevents the sealant from adhering to the bottom of the crack, thus allowing the sealant to stretch and compress with structural movement, which greatly enhances its longevity and effectiveness. The presenter then introduces the specific product to be used, 'Tower Tech 2 elastomeric sealant,' noting its role in completing the repair over the backer rod.

Goal: Carefully insert the backer rod into the identified large cracks, ensuring a snug fit, and prepare to apply elastomeric sealant over it.