How to establish the grade/drop for running a drain line?

As plumber said most codes call for a quarter of an inch drop per foot and a two inch line if the trap is inch and a half. You need to check your local codes also to make sure you can do the work yourself. Some areas don't allow anyone

except "trained, licensed" plumbers do installations. This is one reason these dudes cost so much.

Hi, The International Plumbers Code dictates 1/4 inch pitch per foot of drop using 2 inch pipe connected to an 1-1/2 inch trap with hanger spacing every 4 feet.Good Luck! P.S.-This is the reason Plumbers are Licensed and spend many years in an apprenticeship program, it is a skilled trade dealing with public health and safety-just some food for thought.

The best thing is to be careful what you put down the drain in the first place! Grease and oils should never be put down the kitchen drain. Keep hair cleaned out of the bathroom traps. Not a fun job but a necessary one. Or use one of those little plastic "strainer" type things that traps the hair before it gets in the drain. I use white vinegar and baking soda to keep the kitchen drains running well. I know that members of the family are not as particular about what they put down there. I clean my coffee maker with white vinegar and water 50/50 mix once a month. I take that pot full of hot water and vinegar and dump it on top of about a cup or two of baking soda in the kitchen drains. Let that "cook" for awhile and either run the dishwasher (lots of hot water) or flush the line with hot water from the faucet. I also dump any big pots of hot cooking water down the drain while they are still pretty hot, no sense in letting them cool when the hot water heats up the kitchen and will help remove gunk from the drains. I hesitate to use any of the chemical based products; the last thing you want is a back up filled with lye, acids and other toxic chemicals. And you have to bear in mind that many drain lines are really old and the adding of the new low flow items just brings the problem to the surface. Drain lines can only take so much abuse and most of us do not think about what we send down the great whirlpool.

one thing you can do is check with building inspector in your city or county,,,or maybe click on building codes for your city or county,,,,,in Mississippi it s 1/2 inch per 10 foot,,,,straps should Be bout 2 or 3 feet apart,,,drain line should not be less than 1 1/2 inch in diameter,,,,hope this helps,,,,bye now u hear,,,