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| Here's a good summary of the various mortar types and their properties: link Either type M or S should work for your foundation wall, but S might be best. This is from the mason contractors website: "It should be remembered that stronger is not necessarily better when selecting mortar for unit masonry. For example, it is not typically necessary to use Type M mortar for high-strength masonry. Type S will provide comparable strength of masonry, and in fact the Masonry Standards Joint Committee's design standard ACI 530/ASCE 5/TMS 402 does not distinguish between the structural properties of masonry constructed using Type S mortar from that constructed using Type M mortar. Moreover, Type S and Type N generally have better workability, board life, and water retention. As a rule of thumb, the specifier should not require use of a mortar of higher compressive strength than necessary to meet structural design criteria." What is that strength? "The five typical mortar mixes designated types M,S,N,O and K are labeled so because each is an alternate letter in the term MASON WORK in descending psi strength.... M 2,500 psi A S 1,800 psi O N 750 psi W O 350 psi R K 75 psi Last edited by dbhansen : 05-07-2008 at 03:34 AM. Reason: added link |
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| Good info there! Strength is a relative term though. Compressive, tensile, shear...
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