About Joint Sawing and Sealing
Control joint sawing and sealing are essential for managing concrete cracking and protecting slab integrity. Properly placed and sealed joints control where cracks occur, prevent uncontrolled random cracking, and protect against water infiltration that accelerates deterioration.
Saw cutting timing is critical for control joints. Cuts must occur after concrete has gained enough strength to support the saw but before shrinkage causes uncontrolled cracking. This window varies with temperature, humidity, and concrete mix. Our crews monitor conditions to time cuts appropriately.
Joint sealing prevents water and debris from entering joints and damaging concrete or subgrade. Sealant selection depends on joint movement, traffic, and chemical exposure. We specify and install appropriate sealants for each application.
Commercial joint maintenance programs should include periodic inspection and resealing as sealants age and fail. Failed joint sealant allows water infiltration that undermines slabs and causes premature concrete failure.
What’s Included
- Joint layout planning
- Saw cutting to proper depth and timing
- Joint cleaning and preparation
- Sealant installation
- Backup material where required
- Quality verification
- Maintenance schedule recommendations
Frequently Asked Questions
When should control joints be cut?
Control joints should be cut within 6-18 hours of concrete placement depending on conditions. Earlier cutting in hot weather, later in cold. Waiting too long allows uncontrolled cracking. We monitor conditions to time cuts properly.
How deep should control joints be cut?
Control joints should be cut to 1/4 to 1/3 of slab thickness to properly control cracking. Shallow cuts may not control cracking; cuts deeper than necessary are not beneficial. Standard practice is 1/4 slab thickness.
What sealant types are available for joints?
We use silicone for high-movement joints, polyurea for fast return to service, and polyurethane for general applications. Hot-applied sealants are used for large exterior projects. Material selection considers traffic, movement, and service conditions.
How often should joint sealant be replaced?
Joint sealant life varies with material type, traffic, and conditions, typically 5-10 years for quality materials. We recommend annual inspection with resealing as needed. High-traffic areas may need more frequent attention.
Can you cut joints in existing concrete?
Yes. Additional joints can be cut in cured concrete to address cracking problems or improve joint layouts. The cuts are purely cosmetic control at that point but can help contain existing cracks.