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Old 01-13-2018, 03:57 PM   #1
bradley paul
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correct mud for curb

I read the mud mix for shower base should be 5 to 1, sand/portland cement mix.

The curb however should have lime added to the mix if I understand correctly. I see a product at lowes that is a type s cement (mortar) mix that is 9 to 2 to 1. sand/portland/lime.

Is this appropriate for the curb?
Or type N cement?

I also saw a quikcrete stucco mix that lowes sells, but my local store does not carry it.

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Old 01-13-2018, 04:26 PM   #2
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You can either add some lime, or what I do is just use brick morter (mason mix) for my curbs as well as filling the void under Kerdi drains....but, that's just me.

“Everything in excess! To enjoy the flavor of life, take big bites. Moderation is for monks.”
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Old 01-13-2018, 05:00 PM   #3
bradley paul
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correct mud for curb

thank you for responding so quickly. So is a masonry mix the same as the quikcrete N Mortar Mix i find on the lowes website? Or is it the type S cement mix what you are referring to? I see so many cement and masonry mixes, that I kinda confused as to whether they're the same thing, very diff or close to the same.
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Old 01-13-2018, 06:45 PM   #4
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The type S will work fine.

Type M -- 2500 PSI
Type S -- 1800 PSI
Type N -- 750 PSI
Type O -- 350 PSI

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Old 01-13-2018, 09:58 PM   #5
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I have a question since you got the psi's out there for us. What does psi represent when talking concrete or mortar?

I always thought that it meant that an inch of type m weighed 2500 pounds.

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Old 01-13-2018, 11:28 PM   #6
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That represents the compression strength of the material. I.e. if it is 1000 psi, then a non-slender column (so we can ignore buckling) of the material that is 1 inch square in cross section should support 1000 pounds without failing. Strength in tension or flexure is much less (for these materials).

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