How To Look At A House

McGarry and Madsen's home inspection blog for buyers of  

site-built, mobile/manfuactured and modular homes

What is code for minimum height of crawl space from ground to bottom of floor joists?

Tuesday, January 5, 2021

The minimum distance from ground to bottom of wood floor joists is 18-inches, and that’s reduced to 12-inches for the bottom of wood beams, per International Residential Code (IRC-317.1.1). This is specified for the purpose of avoiding wood decay that tends to occur when a wood floor structure is too close to damp ground, and not really about having sufficient room to move around under the home. Wood that is preservative-treated or a naturally durable species is allowed to be lower to the ground.

Also see our blog post What is the code requirement for the height and width of an access opening to the crawl space under a house?

• • • • • • • • • • • • • • • • • • • • • • • • • • • •

Here’s links to a collection of some of our other blog posts about CRAWL SPACES:

Is white mold on wood in a crawl space dangerous?

• Should I buy a house with a crawl space?  

Is the crawl space under a house required to be ventilated if the floor is concrete? 

How much ventilation is required for the under-floor crawl space of a home? 

• What does a home inspector look for in the crawl space under a home? 

 • Why does venting a clothes dryer into a garage, attic, or crawl space cause problems? 

• When were receptacle outlets in the crawlspace under a home first required to be GFCI? 

• What is the minimum height above ground for wood floor joists and girders/beams? 

 Why is it a mistake to store lumber in the crawl space under a house? 

• What are the minimum access openings for a termite (WDO) inspector in Florida for a crawl space and attic, and within these spaces? 

• What does a home inspector look for when examining a mobile home crawl space? 

• Is it acceptable for an air conditioning condensate drain line to terminate under the house? 

• When were receptacle outlets in the crawlspace under a home first required to be GFCI? 

• Does a home inspector go into the crawl space under the house?

       Visit our CRAWL SPACES page for other related blog posts on this subject, or go to the INDEX for a complete listing of all our articles. 


Water Heaters

Water Heater Age

Wells

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 Us

(placeholder)