I have an older home with a stone and mortar foundation. I purchased the house about 18 months ago.
My plan is to reparge the entire *interior* surface.
The foundation appears to be in decent shape – no loose stones or cracks – but the parging is all over the map.
Some sections have have cement based parging that is clean and in great shape. Other areas are bare, with any parging that was once there having flaked off years ago. One wall that appears particularly prone to effervescence has what appears to be plaster (it is white and fairly brittle, but I cannot be sure that it is in fact plaster). The plaster is on about 50% of the surface, with much having broken or flaked off.
My question is: is the time and effort required to remove all the old parging, including the plaster, worth it? Or can I just parge over what is there (after removing any loose or cracked portions, of course).
Given the moisture issues – I know that the parging is likley going to be a once in 7 or 10 year job (exterior waterproofing seems unlikely in the near future, but downspouts have been relocated and landscaping re-done to reduce any water flowing towards the house).
Thank-you or any tips, suggestions or pointing out any oversights or misconceptions.
Replies
Mike
if the bond is broken between any of the parging and the foundation-it'll come off probably sooner than later. If you were to remove everything that isn't loose, (tap on it-makes a different "hollow" sound than the good stuff) and then slathered on a conrete glue, you might stand a chance. Many of the available parge coatings have a good "adhesive" built in, but I have used with success what's sold as concrete glue-a milky white (sometimes lt. blue) liquid-much like elmers glue). It bonds to the foundation, the parge bonds to it.
Again though, what's being pushed off or what has lost it's stick is already failing-anything over it will go the same route.