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FAQ

What is efflorescence?

Efflorescence is a naturally occurring process in all concrete products that sometimes appears in the form of a white powdery film on the pavement surface. It does not, in any way, compromise the functionality or the structural integrity of the product. Although efflorescence cannot be prevented, it will wash off over time or can be cleaned with an efflorescence cleaner.

Can I use deicing salt on pavers?

Of all the product lines Carlisle Cement Products distributes, The Techo-Bloc warranty is the only one to cover any disintegration and/or decomposition of their products (* not including Stonedge products) resulting from natural causes AND  the abnormal deterioration of the surface due to the use of sodium chloride (NaCl) such as de-icing salt.

Is it possible for weeds to grow between my pavers?

It is recommended to use polymeric sand in the joints of your pavers to inhibit the growth of weeds and grass. Polymeric sand is a high-tech mix of graded sand and binder formulated for the filling of narrow or wide joints when installing pavers, slabs and natural stones, or when replacing existing joints. Unlike conventional sand, it stays in place and remains stable.

After installing polymeric sand, I can see a white haze over the pavers. What is that?

This is called “polymeric haze”. It is sometimes caused by the non-usage of a leaf blower during the sand installation. But more often, it is caused by under-wetting the joints during installation. This haze can easily be removed with an efflorescence cleaner or a hot water pressure washer.

What can be done to remove moss from the joints of my pavers?

There is little that can be done in damp, shaded areas to prevent moss from continuously growing. However, you can try using 10 parts water to 1 part chlorine bleach to remove the moss. A professional-grade Moss/Mold/Mildew cleaner can also be applied but will not further prevent reoccurrence.

Is it possible to lay pavers over an existing concrete walkway that is in good shape?

For concrete walkways, balconies, patios or step landings in good structural condition, a concrete paver overlay is the answer. Concrete overlays are a quick and easy way to dress up and provide character to old and dull concrete.

What is the difference between slabs and pavers?

The major differences between slabs and pavers lie in their design and application possibilities. Pavers are designed with interlocking qualities and are structurally suitable for surfaces exposed to vehicular traffic. Slabs, on the other hand, do not possess interlocking qualities and are essentially tiles used for surfaces exposed to pedestrian traffic only, such as a walkway, patio or poolside. Slabs and pavers can also be combined to create interesting visual effects with banding and mosaics.

Are there advantages to sealing my pavers/slabs?

Sealing pavers is really for aesthetic purposes as the quality of the products is not compromised if you do not seal them. It really is up to individual preferences – sealing them can enhance the color and make the product more stain resistant and easier to keep clean. It is entirely optional, but you must remember that typically solvent-based sealers need to be reapplied every 3-5 years while water-based sealers are 1-3 years. If you are going to seal the product it is recommended that you wait at least one year to allow the final curing of the paving stones and allow the initial efflorescence to weather off. The product will absolutely need to be cleaned with efflorescence cleaner before you proceed with the sealing.

What is geogrid?

Geogrids are open-celled, directional fabrics that are placed between the layers of block at different intervals to stabilize the soil behind a retaining wall and secure the wall face to the earth being retained. Geogrids are laid out perpendicular to the wall face within the compacted soil behind the wall. The height of the wall being constructed, soil characteristics, and the pressure on the wall caused by the slopes, structures, and/or paved areas all affect the proper placement of geogrid.