This allows gravity to divert the water back outside the structure should it make its way behind the siding. whatever type it is.

The next night at 10pm the tenant calls & we have a sudden leak of water from the evaporative cooler float that stuck and this same tenant has water coming out the ducting.They open up the ceiling and we have black mold--rotting plywood behind roofing material and behind the affected ceiling fan area.He's trying to play the "I didn't know" game and had to remind him that he has a bid, in writing, for a repair of near $1000 bucks so "something" had to be going on to be a repair of that gravity over a year ago.This guy is a lawsuit looking to happen and I don't see the insurance covering any of it....

But... of course there has to be some "genius" explanation that only the most brilliant people can understand and everyone else is just too dumb to see it.Actually, that's the way most things in the Universe are...Take gravity for example.

Unless you want to use a pump system, drains have to have natural gravity fall, and you might not be able to get that in some locations.

I have a gravity system on the main house and a pump system in the ADU.

Sewer can especially be a unique challenge because you either need gravity back toward the house or you need an injection pump to grind up the sewage and shoot it down a higher pressure line.Also, where are you going to park if you convert the garage?

Here's a good article: https://m.startribune.com/gravity-furnaces/135646573/

Remove the 'support' of the ground, gravity is going to take over unless you mitigate it.

What is hurting us is that the home still has the original 100+ year old gravity furnace.

I'll be investing in 3-D and Anti-Gravity companies!