The required overlap depends on the ladder's length and design. Follow the markings and manufacturer instructions, and never extend a section beyond its stated limit.
Secure Leaning Access for Short Duration Work
Extension Ladders provide adjustable leaning access for maintenance, inspection and short-duration work at height. Their sliding sections allow a longer working length while reducing transport and storage size. MacBlair stocks them alongside other ladder types, so the method can be matched to the task rather than relying on reach alone. Section locks must carry the extended load without relying on the rope for support.
Choose a length that allows the correct overlap between sections and avoids standing on the top three rungs. When the ladder provides access to another level, it should normally extend at least one metre above the landing point unless an equivalent secure handhold is available. Compare the required setup with freestanding step ladders where no sound upper resting point exists. Measure from the base position to the landing rather than using wall height alone.
Set Extension Ladders at approximately 75 degrees, using the one-in-four rule. Both stiles should be secured to prevent outward and sideways movement, and the top must rest against a strong surface rather than glazing or plastic guttering. Extend or retract sections only from the ground. Keep overhead electrical lines and other site hazards within the risk assessment. A stand-off or stability device may be needed where the assessment identifies it.
Before each use, inspect rungs, stiles, feet, ropes, pulleys, guides and locks. Clean mud, oil and wet debris from footwear and the ladder, maintain three points of contact and carry only light items in a tool belt. Roof work needs specialist roof ladders; an ordinary extension model should not be laid across a pitched roof. Store sections closed and supported so the stiles cannot twist.
Extension Ladders FAQs
Use the one-in-four rule, placing the base about one unit out for every four units of vertical height. This gives an angle of roughly 75 degrees before the ladder is secured.
For access to another level, it should normally extend at least one metre, or about three rungs, above the landing to provide a handhold. An equivalent secure handhold may be used where the planned system allows it.
Footing is a last resort when tying, a stability device or secure wedging cannot be used. Plan to secure both stiles against movement whenever reasonably practicable rather than relying on another person.
Check stiles, rungs, feet, ropes, pulleys, guides and section locks for damage, contamination or wear. Remove the ladder from use if any component is bent, split, loose or fails to engage correctly.