Acetone (for clean-up of polyurethane-based products)
Project Guide – Repairing Cracked Concrete
Why Do You Seal Cracks?
Cracks in concrete indicate an underlying problem that has caused the slab to shift. The most common issue is soil instability caused by moisture intrusion, improper site preparation or poor soil conditions. Most cracks are “active, meaning that patching with a cementitious product is a losing battle – the crack will appear again until the underlying issue is remedied.
Once a crack appears, the most important thing to do is seal it with a flexible material to prevent moisture intrusion which could further accelerate the instability causing the crack.
Choosing the Right Product
Many crack repair products can solve the same problem – knowing how to choose the right option for your project is the first step.
Latex-based products, including Sakrete Crack Filler and Sakrete Concrete Repair offer good performance – suitable for cracks up to 3/8” deep and 1/2″ wide. Latex-based products offer easy clean-up and will last for a couple of years depending on application conditions.
Polyurethane-based products, including Sakrete Non-Sag Sealant and Sakrete Self-Leveling Sealantoffer better performance with a superior bond and flexibility for cracks up to ½” deep and wide. Polyurethane-based products require acetone or similar chemicals for cleaning but deliver superior durability and longevity.
The most important consideration is that the crack is large – and clean – enough to accept the crack repair material chosen for the job.
Estimate the amount of material required. One bottle of Sakrete Crack Fillerwill seal about 35 linear feet. All tube products will seal about 12 linear feet, depending on depth and width of the crack.