Frequently Asked Questions

 

Q: Why are they called "Interlocking Concrete Pavers"?

A:  It is the system that makes them interlocking concrete pavers, not necessarily the shape. When installed properly, the combination of the pavers, bedding sand, edge restraint and joint sand causes them to interlock, allowing them to work as a unified, flexible pavement.

 

Q: How much granular base material is required?

A:  As a rule of thumb, a minimum of 4-6” should be used in sidewalks and patios and 10-12” in residential driveways. One inch of concrete sand is used as a bedding material. Stone dust or screenings is no longer recommended as it contains too many fines and holds moisture.

 

Q: Shoul a geotextile be used under the granular material?

A: In situations where the soil subgrade is unstable, it adds to the quality of the project to install a woven geotextile on top of the subgrade and below the granular base material. The purpose of the geotextile is as a separator to keep the subgrade and base from mixing over time.

 

Q: Should the pavers be sealed?

A: Sealers help resist stains, enhance the colour and bind the sand in the joint to make it difficult for weeds to germinate. Sealers are a topical treatment and should be reapplied every 2-4 years to maintain the advantages. Removing the efflorescence before sealing is a critical step in the process. Sealing pavers also allows for better snow and ice removal. Pavers should not be sealed until 60 days after installation.

 

Q: Will weeds / grass grow between the pavers?

A: Weeds and grass result from seeds or spores blowing into and lodging into the joint sand. This is minimized because we use stabilizing (polymeric) joint sand. The stabilizing joint sand hardens in the joint and resists seed germination. Sealing the pavers also seals the joint sand retarding weed seed germination. If weeds do occasionally appear they may be pulled out by hand.

 

Q: What should I do if the pavers become stained or damaged?

A:One advantage of pavers is that individual units can be removed and replaced in these situations. There are also excellent cleaning products which are designed to use on pavers.

 

Q: Can I plow or shovel snow off the pavers?

A:Snow can be plowed, blown or shovelled just like asphalt or concrete pavements. The chamfered (bevelled) edge of pavers will prevent you from catching an edge with the plow or shovel. Using de-icing products like salt or calcium chloride will not harm or pit the pavers. Electric or liquid snow-melting systems work well under concrete pavers, eliminating snow removal while reducing slip hazards.

 

Q: What if the pavers settle over time?

A:Pavers can be repaired by lifting the affected area, re-grading and re-compacting the base and bedding sand and reinstalling the same pavers. It is an inexpensive procedure that leaves no unsightly repair patches.

 

Q: What is efflorescence?

A:Efflorescence comes from the natural free lime released from the ingredients used to make the pavers. As the pavers cure, the moisture that is being released brings the white lime residues to the surface. It will eventually wear off or can be removed with an efflorescence cleaner specifically made for concrete pavers.