Why are most pull-down attic ladders not approved by building code for installation in a garage?

Monday, June 24, 2019

The wall between an attached garage and the house living area is required to be minimum 1/2” drywall. Most garages have a ceiling secured to the bottom chord of the roof trusses or rafters, and that has to be 1/2” drywall also when the attic is continuous over the garage. There is a high incidence of fires started in garages due to the gasoline and other flammable materials often stored there and the intent is to create a barrier between the garage and house for fire protection.


   But the way it is actually stated in the Residential Edition of the Florida Building Code is a “separation” between dwelling and garage, and as “not less than 1/2-inch gypsum board or equivalent. The International Residential Code (IRC) is similar.


   Most homes have a 1/2” drywall panel installed in the attic access opening, which is fine. But when you put something else in the opening, it must be equivalent to 1/2” drywall, which has roughly a 20-minute fire resistance. The 1/4” plywood panel at most attic ladders does not meet that standard. There are several solutions:

1) There are fire-rated attic ladders on the market, starting at about $800 + installation. Not cheap, and they far exceed the equivalency requirement.
2) Install a non-fire-resistant attic ladder somewhere in the house instead of the garage.
3) Some jurisdictions apparently allow modifications of the exposed surface of the ladder, such as applying 1/2” drywall to it or painting the wood with a fire-resistant paint. The application of 1/2” drywall seems like a bad solution because the unit will likely end up sagging away from the opening as the added weight overwhelms the closure springs—thereby creating an even worse situation of a direct opening in the attic. It will also probably void the manufacturer’s warranty. And not sure how verification of the fire-resistant paint on the surface of the ladder would be done.

    Anyway, the one sure thing is that an off-the-shelf attic ladder from a big-box home improvement store in the garage ceiling is a definite no-no. But we see them pretty regularly.

    Also, if you look closely at the photo at the top of the page, someone has also added a vent grille (for either combustion air or garage ventilation) in the ceiling that opens directly into the attic; yet another penetration of the required 1/2” drywall garage/attic separation.

    For a more complete explanation of all the garage/house fire separation requirements, go to our blog post What are the code requirements for fire separation between an attached garage and the house?  Also, see our blog post Does an attached garage that is only used for storage or as a workshop, and not for parking a car, still have to comply with building code requirements for a garage?

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Here’s links to some of our other blog posts about GARAGES AND CARPORTS:

Why is a garage floor sloped?  

What is the difference between a carport and a garage? 

Why is my garage ceiling sagging? 

Why are there score line grooves in the concrete floor of the garage? 
 
Can a bedroom door open into the garage?

How far apart should electric receptacle outlets be placed in a garage? 

Why if the garage door track a white tube? 

What is the raised metal plate on the floor under the garage door?

 Why do I have to hold down the button to close the garage door? 

How can I check my garage door to make sure it is safe?  

What does a home inspector check on an electric garage door? 

• Can the a garage door header bracket and torsion springs be mounted through drywall? 

How can I tell if cracks in the garage floor are a problem or not? 

Is tempered/safety glass required by the building code for windows and doors? 

 What is the unusual garage door opener mounted on the wall above the door and marked "Wayne Dalton”?

When were GFCI receptacle outlets first required in the garage?

      Visit our GARAGES AND CARPORTS and STRUCTURES AND ROOMS pages for other related blog posts on this subject, or go to the INDEX for a complete listing of all our articles.  

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