Parging is the coating applied to the visible (above-grade) portion of your home’s foundation walls. It is applied to poured concrete, concrete-block and ICF foundations to hide surface imperfections, marks from form-work and the like, so its decorative. A parge coat is not a requirement under the Building Code, but it does have another useful purpose: it acts as a barrier against inclement weather.
It’s a different story for foundation walls with exterior insulation. In this case, application of parging over an armature or other rigid finish material is a must, to protect the insulation from impacts as well as sunlight.Conditions for parging application The following conditions must be respected to ensure successful foundation parging: Surface must be free of stains and any brittle material. Surface must be moistened before application of the mixture. Mix must be prepared according to the manufacturer’s instructions. Application and curing temperature (at least 5°C) must be respected. Parging must be periodically moistened during the curing period.Conditions for parging application The following conditions must be respected to ensure successful foundation parging: