How To Look At A House

McGarry and Madsen's home inspection blog for buyers of  

site-built, mobile/manufactured and modular homes

PLUMBING DRAINS AND TRAPS

Friday, April 10, 2020

Here’s links to a collection of our blog posts about PLUMBING DRAINS AND TRAPS:

Why can't a sanitary tee be used for a horizontal-to-horizontal drain pipe connection? 

Is a washing machine drain hose required to be secured at the standpipe?

 Why is it a problem when a trap under a sink is installed backwards? 

What are the code requirements for plumbing vent terminations?

What are the code requirements for layout of drain piping under sinks?

What are the building code requirements for gray water reuse in Florida?

What causes a gurgling sound when a bathtub or sink drains? 


 What is the difference between a vent stack and a stack vent?

What is a "combination waste and vent" in a plumbing system? 

Why is garbage disposal not allowed at a combination waste and vent (CW&V) under a sink?

What is a building trap?  

What is an indirect waste receptor? 

What is the difference between water pipe and sewage (waste) pipe? 

How can I tell if a house is connected to a septic tank system or sewer?

What type of water supply and drain (DWV) pipes were commonly used in the 2000s? 

What type water supply and drain (DWV) pipes were commonly used for 1990s residential plumbing?

What type water supply and drain (DWV) pipes were commonly used for 1980s residential plumbing?

What type water supply and drain (DWV) pipes were commonly used for 1970s residential plumbing?  

What type water supply and drain (DWV) pipes were commonly used for 1960s residential plumbing? 

What type water supply and drain (DWV) pipes were commonly used for 1950s residential plumbing?

Should I seal the washing machine drain hose to the standpipe?

 Why is the European-style bottle trap not approved by the plumbing codes in the U.S.? 

What is an auto vent, air admittance valve, or check vent?

Can I make a trap under the sink from straight pipe and 90º elbows?  

If all the plumbing drains have water in them and you can still smell sewer gas, what's causing the problem?  

Why is there a flexible accordion pipe under the sink? 

How do I get rid of the sewer gas smell in my house?  

What are the pipes on my roof? 

What is a "cross connection" in a home's plumbing system?

What is an "S-Trap" under my sink? Why is it a problem? 

What is a P-trap?

What is the difference between gray water and black water in the plumbing code? 

Is a sink required to have a drain stopper? 

• Can a laundry sink drain be installed without a trap under it? 

• What is a drum trap at a plumbing drain?

• Can a dishwasher drain hose be connected after the sink trap (to the trap arm)? 

How far away from the sink can I install a dishwasher? 

What is a "high drain loop" or "air gap" in a dishwasher drain hose?

• What is the minimum and maximum distance a P-trap can be below a sink? 

• Is an air admittance valve (AAV) legal by code? 

• What is a double trap in plumbing? 

• Can two sinks share a trap? 

Does a home inspector check sewer lines underground? 

• What types of plumbing traps are illegal by code? 

What is bell trap at a plumbing drain? 

• How many plumbing vents through the roof are required by code? 

Why is there a floor drain in the laundry room? 

• Can an air conditioning condensate drain pipe connect to a sink drain? 

What is the minimum and maximum slope of the trap arm of a plumbing drain?

• Can an air admittance valve (AAV or Studor) be installed horizontally? 

• Are running traps legal by plumbing code?

• What is the minimum trap seal depth under a sink drain? 

• What is the maximum trap seal depth under a sink drain?


Water Heaters

Water Heater Age

"What Are The

Signs Of..."

Septic Tank Systems

Structure and Rooms

Plumbing Pipes

Termites, Wood Rot

& Pests

Sinkholes

Stairs

When It First

Became Code

"Should I Buy A..."

Park Model Homes

Site

Shingle Roofs

Safety

Stucco

Remodeling

Wind Mitigation

Roof and Attic

"Does A Home

Inspector...?"

Pool and Spa

"What Is The Difference Between..."

Radon

Brick

Plumbing

Concrete and

Concrete Block

Metal Roofs

Foundations

Modular Homes

Rain Gutters

Mold, Lead & Other Contaminants

Condominiums

Older and

Historic Houses

Crawl Spaces

Mobile-Manufactured Homes

Building Permits

Life Expectancy

Clay Soil

Insurance

Floors

Insulation

Toilets

Exterior Walls

& Structures

Generators

Common Problems

HUD-Code for

Mobile Homes

Garages and Carports

Flat (Low Slope) Roofs

Electrical Panels

Sprinkler Systems

Electrical Receptacle Outlets

4-Point Inspections

Hurricane Resistance

Frequently Asked Questions (FAQ)

Home Inspection

Heating and Air Conditioning

Building Codes

Fireplaces and Chimneys

Inspector Licensing

& Standards

Energy Efficiency

Washers and Dryers

Electrical

Kitchens

Doors and Windows

(placeholder)

Cracks

Electrical Wiring

Click Below  

for Links

to Collections

of Blog Posts

by Subject

Plumbing Drains

and Traps

Appliances

Smoke & CO Alarms

Aging in Place

Top 5 results given instantly.

Click on magnifying glass

for all search results.

Bathrooms

Lighting

AFCI, CAFCI,

DFCI, & GFCI

Sinks

Air Conditioner & Furnace Age/Size

Attics

Electrical Switches

Siding

Search

This

Site

Water Intrusion

Electrical - Old

and Obsolete

(placeholder)

Foundation Certifications

Tiny Houses

About McGarry and Madsen

(placeholder)

Wells

Buying a home in North/Central Florida? Check our price for a  team inspection by two FL-licensed contractors and inspectors. Over 8,500 inspections completed in 20+ years. In a hurry? We will get it done for you.

Moisture Problems

Crawl Spaces

Bedrooms

Closets