The range of underlayment products to address virtually any issue with concrete substrates include the following:
- Moisture control systems reduce moisture emissions in the substrate to levels that meet the requirements of flooring manufacturers.
- Patches, which have sand in them, act as fillers for deeper and bigger cracks and depressions, typically, ¼” to ½” deep. They are usually more economical to use for larger areas.
- Primers improve the bond of underlayments and seal the substrate. Standard primers are used over absorbent dry concrete, wood or other porous substrates. Non-porous primers are suitable for non-absorbent substrates, such as ceramic, terrazzo and metal.
- Self-drying concrete eliminates the need for excess water in the subfloor to evaporate prior to the installation of flooring.
- Self-levelers are for subfloors that are significantly out of level or have depressions or holes more than ¼” deep. Self-levelers are commonly used to fill trenches that have been dug for plumbing pipes.
- Skim coats are typically used to address minor imperfections in floors, such as small cracks, divots or rough surfaces. They may also be recommended to cover old adhesive residues on the subfloor. Skim coats are typically a fine powder with no sand, so they can be thinly spread – generally no thicker than 1/8”.