SizeThickness,
inches
Weight per ft.,
pounds
Depth of
socket
Annular space
31⁄2711⁄21⁄4
41⁄2915⁄83⁄8
55⁄81213⁄43⁄8
65⁄81517⁄83⁄8
83⁄42323⁄8
913⁄162323⁄8
107⁄83521⁄83⁄8
1214521⁄41⁄2
1511⁄86021⁄21⁄2
1811⁄48523⁄41⁄2
2013⁄810031⁄2

Terra-cotta pipe should not be permitted in filled-in ground.

Roots of trees find their way into the pipe through cracks or cement joints. When the roots get inside of the pipe they grow until the pipe is stopped up. As the roots cannot be forced or wired out, the sewer must be relaid. The writer has seen a solid mass of roots 10 feet long taken out of a tile sewer.

In case terra-cotta is laid in filled-in ground, there is only one way to insure the pipe from breaking. The pipe should be laid on planks. Then, if the ground settles, the pipe will not be broken.