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How to Grout Pipe

Grouting pipe involves installing cementitious material around the inside or outside surface of a submerged length of pipe to prevent or stop corrosion of the pipe and plug any existing holes. The process of grouting usually involves advanced equipment and complex procedures. For homeowners with large exposed pipes like culverts that run beneath driveways over drainage ditches, however, a relatively simple do-it-yourself solution to grouting exists.

Things You'll Need

  • Tape measure
  • Plastic slip pipe
  • Water pump
  • Power saw
  • Wood blocks
  • Drill
  • Screws
  • L-shaped brackets
  • Metal pipe
  • Wood shims
  • Pipe grout
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  1. Preparation

    • 1

      Measure the length of the pipe you want to grout, using a tape measure.

    • 2

      Measure the diameter of the pipe with the tape measure.

    • 3

      Purchase a plastic slip pipe with a slightly smaller diameter than the pipe you want to repair with grout. Make sure the slip pipe is the same length as the pipe you want to grout. A plastic slip pipe is nothing more than a length of plastic pipe you can fit inside the existing pipe.

    • 4

      Remove any sitting water from the existing pipe using a water pump. Rent a water pump if you don't own one and follow the manufacturer's instructions for use.

    • 5

      Place the plastic slip pipe in the existing pipe, so the bottom of the slip pipe rests on the bottom of the existing pipe.

    • 6

      Measure the distance from the top of the slip pipe to the top inside rim of the existing pipe, using a tape measure.

    • 7

      Cut a number of wood blocks to a thickness equal to this height, using a power saw.

    • 8

      Attach two wood blocks to the ceiling of the existing pipe, using L-shaped metal brackets and screws or bolts suited for use with the material of the existing pipe. Drill on face of the bracket into the wood block and the other face of the bracket into the pipe. Situate the blocks so they extend from the ceiling of the pipe to the top of the slip pipe.

    • 9

      Remove the slip pipe.

    • 10

      Install two rows of wood blocks and even intervals throughout the length of the pipe, in line with the first two blocks. The distancing of the blocks depends upon the length of the pipe, though you don't need a huge number. Space them every few feet from one another. If the pipe is too small for you to enter, simply place blocks at both entrances.

    • 11

      Reinstall the slip pipe.

    • 12

      Cut a length of relatively small metal pipe – no more than 6 inches in diameter – the same length as the slip pipe, using a saw. The metal pipe opens the grout for air to escape.


    • 13

      Mix a large amount of grout in a wheelbarrow, following the instructions of the manufacturer of the grout.

    • 14

      Pour the grout in large quantities into the space between the slip pipe and existing pipe. Grouting essentially entails filling this space completely with grout.

    • 15

      Continue mixing and pouring grout until you fill all space between the two pipes. Grouting large pipes this way requires a huge amount of grout.