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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.

thanks
Brad
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Old 01-13-2018, 04:26 PM   #2
Lazarus
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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.
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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
Davy
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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
Shady at Best
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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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