I have an 8″ concrete block wall . I want to stucco or parge it with a cement/sand mix in one step. Does anyone have a “recipe” for such mix in this application?
I don’t care for the synthetic products, nor do I need a styrofoam insulating base. The blocks have been layed with a flush finish to the mortar joints, no pointing, to minimize the joints telescoping through. I have seen a simple cement and sand mixture that was applied in one application, and it was pretty strong. Anyone with some experience in this???
Thanks,
Miles
Replies
You can buy a ready-mix product that is mostly portland, masonry sand, and chopped fiberlass. It can go by the trade names of "B-Bond" or "Fibercoat" and I'm sure a few other names. Just mix with water and trowel it on about 3/8 inch thick. Moisten it with water spray for a few days and voila...you're done and the stuff is waterproofed. It is sold in either white or gray. A 40 # bag used to cost around $12 and the product went rather far.
Another product, named "Thoroseal" is a cementitious product that can also be trowled on at about 1/2 inch thickness. Though this particular product looks good for dressing up plain block, it also has a tendency to crack within 4 to 5 years. B-Bond seems to hold up better in my book.
A regular recipe for real stucco would be to use type N mortar, masonry sand, and use a latex additive in with the water . I haven't really mixed much stucco, but I think the formula calls for 3 parts sand to one part mortar. I'm sure there are other guys who can post who are more knowledgeable on the subject than I am.
Davo
Thanks for the info. I'll have to look for those products. Some years ago I used a similiar product that had fiber glass strands. I can't recall it's name, ( Surewall??) but it was designed to use on stacked blocks without mortar.
I spoke with a stucco man today. He didn't want to reveal to many secrets, but on a "hard coat he used type S cement" I'll have to do more research , type S vs type N.
Thanks again, you've got me started.