Field & trade terms
Control joint
A control joint is a deliberate groove in a slab, wall or masonry run that gives the material a place to crack as it shrinks and moves. Concrete and mortar always shrink as they cure and swing with temperature, and something has to give. The joint creates a weakened line so the crack follows it rather than wandering across a finished surface. It doesn't stop movement; it steers where the movement shows.
Run it with the Photo Gate
Pre-pour concrete checklist
13 items · 23 photos required
How it shows up on site
In slabs you see control joints as saw-cut or tooled lines on a grid, cut deep enough and soon enough to work. In masonry they're vertical joints spaced along a wall, often with a backer and sealant. Spacing and depth are set by the design; a joint too shallow or too far apart just moves the crack somewhere else.
What an inspector looks at
The check is that joints are where the drawings put them, at the right depth and spacing, and cut in time, because a saw cut made too late lets the slab crack on its own first. Missed or shallow joints get logged before the surface is finished or a topping is placed.
RTI is photo gated, so joint layout and depth are shot in place, with the cut pattern and spacing shown against the slab or wall as the record that the joints were run as designed and not added as an afterthought.
Standards it's verified against
Checklists that put control joint to work
Free, field-ready checklists, each with the photo every item needs before it can be submitted.
Related terms
- Cold jointA weak seam left in concrete when fresh material is placed against a batch that has already started to set, so the two never fully bond.
- Curing (concrete)Keeping fresh concrete moist and at temperature long enough for it to gain the strength the mix was designed to reach.
- Sealant jointA joint filled with elastic sealant to keep water and air out while still flexing as the two sides move apart and together.
- Backer rodA foam rope pushed into a joint before sealant to set the sealant's depth and give it a clean, two-sided bond.
- FormworkThe temporary molds and bracing that hold wet concrete in shape and position until it's strong enough to stand on its own.
- Reinforcement (rebar)The steel bar and mesh cast into concrete to carry the tension the concrete can't, placed to a drawing before the pour buries it.
Knowing the term is step one. Proving it is the job.
RTI holds the submit button until every mandatory item is answered and the photos are attached, then chains the record so it can be proven untouched later.
30-day trial · No card required