I spent the morning figuring out what needed to go out through the front wall of our building; pipes for the sewage system (required by the building code) and overflow pipes for the planters.  We have also elected to put water and electrical lines through the front wall so that down the road they will be available if we want electricity or water in the front yard.

The 4″ black sewage pipe  (shown above) was laid between two tires in the wall at the desired location.  The sewage pipe needs to slope a 1/4″ per foot towards the septic tank.  In our case this means that the top of the pipe going through the wall in the above picture needs to be about 6″ above the ground.  Before we start the next row of tires we will pour concrete in the gap between the two tires and set the pipe in the concrete.  That should keep the pipes from moving until they are attached and buried.

In the afternoon we started filling tires for the front wall of the earthship!  There will be 100 tires in the front wall and we have already filled twelve of them!  This job actually seems easy compared to working on the back wall last summer.  Granted it was only 12 degrees celcius today compared to over 30 degrees regularly last summer.

If you plan to pound tires avoid doing it in the summer!