Mortar Types

type strength mixture (by volume)
K 75 psi

 1 Cement+3 Lime +10 Sand

or 2 Lime+ 5 Sand

O 350 psi 1 Cement+2 Lime +10 Sand
N 750 psi 1 Cement+1 Lime +5 Sand
S 1800 psi 1 Cement+1/2 Lime +4 Sand
M 2500psi 1 Cement+1/4 Lime +4 Sand

 

Mortar Applications

Masonry Material Sheltered Exposure Moderate Exposure Severe Exposure

Very durable;

hard brick

granite

O N S

Moderately Durable

most brick

limestone

K O N

Poorly Durable

soft brick

friable stone

Lime & Sand

K O

©1999 UVM Historic Preservation Program
Revised 1/28/99
Contacts:
Prof. Thomas Visser
histpres@zoo.uvm.edu