Answer / mahendra mohan srivastava, acc

As you know that 1:4 is rich mortor behalf of 1;6, because
1:4 has 1 part of cemet and 4 part of sand, and in 1:6 has
1 part of cemet and 6 part of sand, so same cement contant
but more sand shown that the fine partical more. so when
fine parical more it wants more water, and if we add more
water in same cement contant the strength will reduce. so
in between 1:4 and 1:6, 1:4 is more power full, instred of
1:6.
now interior wall and Outer wall, outer wall is facing more
climate effect, like rain wind etc.
so we use rich morter in outer wall.

Answer / sunil1505

actaully mortar.M 7.5 means..1:6, 1:4 is gives mor bonding
than 1:6 ..1:6 is more used in RR masonary and SSM, so we
should use both..but 1:4 gives the gud quality..according to
cost..1:6 is ok usable

Answer / ahmed

1:4 ratio will be for internal walls

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