What is an attic ladder, and what should you know before installing one?
Short answer. An attic ladder is a folding, sliding or scissor stair built into a ceiling hatch that gives you safe access to the attic. Before installing one, confirm the rough opening fits between the framing without cutting trusses, the ladder fits your ceiling height and weight needs, and the door is insulated and weatherstripped so it does not leak air into the attic.
Types
- Folding wood: the common choice, folding in three sections onto the back of the door.
- Aluminum: lighter and often rated for more weight.
- Telescoping or scissor: for tight spaces where a folding ladder will not land.
Sizing and code
- The residential code requires an attic access of at least 22 by 30 inches for attics over 30 square feet with 30 inches or more of height, with 30 inches of headroom above the opening.
- Match the ladder to your floor to ceiling height and check its weight rating.
- Attics holding an air handler may need a larger opening big enough to remove the equipment.
Things that go wrong
- Cut trusses: never cut a truss chord to fit a ladder. Choose a model that fits between trusses or have the framing engineered.
- Air leaks: an unsealed hatch leaks conditioned, humid air into the attic. Weatherstrip the frame and add an insulated cover or foam board on top.
- Garage ceilings: in an attached garage, the ceiling may be a required fire separation from the house, so a fire rated ladder may be needed.
Why it matters for your roof
Easy attic access is how leaks get caught early. A homeowner who can get up there after a storm spots a stain on the decking before it reaches the ceiling, and a roofer can check ventilation and decking from inside when there is reason to look. See common roof leak causes and what to expect in a roof inspection.