Just remember that expansion joints should always be sealed and filled with a flexible joint sealer and never be epoxied or coated over. Contraction joints can be filled in the same manner after a coating or sealer is applied.
Should you seal expansion joints?
Expansion joints must be sealed with a flexible sealant, like QUIKRETE Self-Leveling Polyurethane Sealant or QUIKRETE Non-Sag Polyurethane Sealant (dependent on application), or an expansion joint strip, to prevent water from penetrating the joint and deteriorating the sub-base.
what is the purpose of expansion joint? In building construction, an expansion joint is a mid-structure separation designed to relieve stress on building materials caused by building movement induced by: thermal expansion and contraction caused by temperature changes, sway caused by wind. seismic events.
should control joints be filled?
Sealing or filling should be put off as long as possible to allow the joint to widen, although in practice joints are usually sealed or filled sooner than ideal. But if left unsealed or unfilled, control joints can become areas for dirt, dust, and debris to collect and cause problems.
How wide should an expansion joint be?
Expansion joints should be wide enough to prevent portions of the building on either side of the joint from corning in contact, when the structure is subjected to the maximum expected temperature rise. Joints vary in width from 1 to 6 in.
Should concrete control joints be caulked?
Control joints or saw cuts should be addressed the same as above. The control joint can be filled with backer rod or even sand. Filling the saw cut is mandatory as control joints are 1/4 the thickness of the concrete. On a 4″ slab, that is a 1″ deep saw cut and nobody want to use that much caulking.
How do you fill gaps between concrete slabs?
Scrape off any old patching tar with a stiff putty knife and remove residual tar or asphalt compounds with mineral spirits and gentle scrubbing with a wire brush. Dig a 4-inch wide trench along the sides of the slabs from the crack or gap closest to the house all the way down to the street or sidewalk.
Are concrete expansion joints necessary?
Expansion joints are virtually never needed with interior slabs, because the concrete doesn’t expand that much—it never gets that hot. Expansion joints in concrete pavement are also seldom needed, since the contraction joints open enough (from drying shrinkage) to account for temperature expansion.
What is self leveling sealant?
Self Leveling Sealant is a single component, self-leveling, premium grade polyurethane sealant with an accelerated curing capacity. It seals horizontal expansion joints in concrete and cementitious slabs requiring no tooling.
How do you caulk a large gap?
To make sure these gaps are as well sealed as your others, follow these easy instructions. Remove all old caulk from the joint to be filled. Measure the size of the gap that needs to be filled. Fill larger gaps with foam backer rod, sometimes called spline. Put a surface bead of caulk over the filled gap.
What does backer rod look like?
QUIKRETE® Backer Rod is an extruded round, closed cell, low density polyethylene foam material with a skin-like outer texture. It is highly flexible and compressible for easy installation.
How do you seal a gap between a wall and floor?
An exterior-based caulking is sufficient. Remove the baseboard, if present, to expose the gap between the subfloor and the wall face. Clean dust or debris from the gap between the wall and subfloor, using a vacuum fitted with a slant nozzle. Insert a tube of caulking into the caulk gun.
How big can a concrete slab be without expansion joints?
Usually, expansion joints should be no farther apart than 2 to 3 times (in feet) the total width of the concrete (in inches). So for a 4 inch thick concrete slab, expansion joints should be no more than 8 to 12 feet apart.
What is the best concrete joint filler?
Akonaflex™ Expansion Joint Filler is a superior-grade, one-component, urethane sealant and filler to be used in concrete joints as well as a wide variety of substrates.
How do you fill a joint in a driveway?
After removing all the old sealant use a vacuum or wet/dry vac to suck up any debris from your concrete joints. Then use a closed cell foam backer rod in between the joints. Foam backer rods act to fill in space between concrete joints so you don’t need to use a ton of self-leveling sealant.