How to install a mailbox without concrete using Sika USA PostFix! It’s easy to use! #contractor #construction #tools #diy | American Contractor

Concrete may seem solid once set, but like bread in the oven, it expands and contracts due to temperature, moisture, and curing. Without control joints, this movement causes stress, leading to random cracks in unwanted places. Control joints are intentional grooves or gaps that guide where the concrete can crack, much like a tear line on a chocolate bar, ensuring clean, predictable breaks. They prevent unsightly, random cracks, keeping the surface strong and smooth for years. Via: @precisionconc