I am preparing to install Owens/Corning cultured stone around the fireplace in a new addition we built on to our house. Owens instructions say to use Type N cement however we have several full bags of Type S leftover from the mason installing the exterior brick. Can I just use the Type S for this application even though it is not specified by Owens? From what I’ve read Type S has up to twice the strength of Type N. thanks guys!
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I don't know why they specked type-n.
I've done plenty of cultured with type-s.
Maybe there is a reason tho, not to mention the
warranty. Strength isn't an issue, so why not just
follow the directions?
Yea, it's no big deal to get the "N". It just seems silly to load up the sacks of "N" and haul it to the lumberyard to trade for "S". And I asked the question partly for my own educational benefit. Thanks for your response.
Type S has a higher percentage of portland cement than Type N. Type S has higher compressive strengh than Type N but you don't need this added compressive strength in your application. In general, Type N mortar is the best overall choice for applications above grade.
In addition to portland cement, masonry cements have admixtures, which help retain water during the curing period, make the mortar more workable and add color. Type N has a higher percentage of admixtures than Type S. These make the former a bit easier to work with.
There are many shades of gray. And different manufacturers and Types produce different hues. So don't mix them halfway through the job. Stick with the same kind and Type from beginning to end.
Thanks for chirping in Mudslinger. I appreciate the expanded bits of knowledge. Bob's next test date: 12/10/07
Edited 4/25/2008 10:59 am by Jim_Allen
Doesn't the type-S seam easier to work with, that's how I've
felt. Holds to the trowel better and finishes a little nicer.
Especially for cultured I found the N to lack plasticity or stickiness.
Type S is required when the mortar is underground...I think. Type N is above ground. Type S will work fine in both places. Type N won't.I'm a carpenter and I'm remembering that information from a long ago discussion with a mason. Don't accept it as fact until it's verified from a better source. Bob's next test date: 12/10/07