Guide On Plumbing A Basement In Clay Soil

September 16, 2009 · Filed Under plumbing 

Basement construction in clay soil poses many Problems. Expansive soil could cause cracking in the foundation, basement walls and floor if sensible precautions aren't taken. Natural movement caused by expansive clay soils also need special precautions to be taken when installing basement plumbing. Pipes can burst if plumbing is too rigid.

Floating walls keep the walls and floors from being damaged as the home moves with the growth of clay soil. This permits the walls to move independently from the floor of the basement. The pipes need to be ready to move upward with the floor but not push against the 1st floor of your home. The drainage pipes under the basement floor have to be ready to breathe too.

When you install lavatories, laundry room, or a mudroom in the basement you must make allowance for natural movement of clay soil. Installing flexible expansion couplings and growth joints on basement plumbing will allow for this movement and keep the pipes from leaking at the joints or cracking.

Your pipes should ideally be new during installation. If you're working with established pipes make sure not to go from one kind of metal to another. If you're using copper stay with copper pipes and the same applies for other metals. Take care to not to switch the scale of pipes accidentally. It is feasible to go from one size to another but it is not always usually wise idea. You must also begin with new pipes whenever it's possible. Older pipes can have lead solder break up while you are working with them and you do not want this to get into your water supply, even if it is for a shower and not drinking water.

Anywhere that you are attaching one length of pipe to another you must add a growth coupling. Expansion couplings are made from a synthetic polymer sleeve that slips over the ends of both pipes. Steel clamps are used to hold the coupling and pipes together. Once applied, the coupling will allow for a bit of movement in the pipes. It's vital to make certain you have the expansion couplings and not regular couplings as the expansion couplings are made to breathe with the home and the regular couplings aren't made to move.

When installing a shower you may use reverse floating walls to stabilize pipes in the basement and allow movement in the apex of the pipes. You should put as much of the plumbing in the same area as practicable and use the same wet wall. A chase should be included and access can be either along a wall or in the ceiling.

Flex lines are required for water supply lines. The main water supply line should go into the chase and have flex lines attached in that area to the pipes utilized in the basement. The most logical place for the chase access panel is in the application room along with the hot water heater.

As well as having expansion joints and flexible couplings installed the pipes there should be sufficient space between the pipes and the ceiling / floor to keep from having the pipes push into the ceiling as the ground expands with the changes in the moisture in clay soil.

Enlargement joints will be needed for installation of ground water drainage pipes also. This can be done below the basement floor, above the foundation. Drains can be placed in the basement floor permitting moisture that does enter the basement to run into the drainage system and away from the home.

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