01 — Three points of contact: a rule that survives the moment one point fails
Maintain two hands and one foot, or two feet and one hand, on the ladder at all times. The entire value of this rule is what happens the instant any single contact point slips, since the other two are still anchoring you when it does.
This is the single most repeated rule in ladder safety, official and otherwise, precisely because research on actual ladder fall incidents consistently identifies a foot slip or a missed rung, not a side-tip or a structural failure, as the most common mechanism behind a fall. Three points of contact does not prevent that slip from happening; it prevents that single slip from becoming a fall, because the remaining two contact points are already holding you in place.
- This rule breaks down fast the moment you climb with tools in your hands, which is exactly why it matters more than it might initially seem. Carry tools in a belt, hoist them up separately with a rope once you're positioned, or make a second trip, rather than ever climbing one-handed because the other hand is full.
- Face the ladder while climbing and descending, in both directions, every time. Facing away even briefly removes your ability to see your foot placement and genuinely compromises the contact points you're relying on.
- Falls from ladders are not exclusively a high-height problem. Research tracking fall height across documented ladder injuries found that roughly half of non-fatal ladder injuries occurred from falls below 10 feet, well within the range many people treat as "low enough to not really worry about." The three-points rule applies on the third rung as much as the fifteenth.
02 — The pre-use check: catching the single biggest cause of ladder falls before you climb
Roughly 40 percent of ladder-related injuries trace to one specific, well-documented cause: the ladder's base sliding out because it was set up at the wrong angle. This single mechanism accounts for a larger share of ladder injuries than any other identified cause, which is exactly why angle and footing deserve the most deliberate attention in a pre-use check, not just a glance.
OSHA's standard for extension and straight ladder placement is the 4-to-1 rule: for every 4 feet of height between the ground and the ladder's upper point of contact, the base should sit 1 foot away from the wall or structure. Done correctly, this produces an angle of approximately 75 degrees, which is the genuine sweet spot between two opposite failure modes: an angle too shallow lets the center of gravity of the climber-and-ladder system shift outside the base's footprint, risking a backward tip, while an angle too steep means the base has too little resistance to sliding and can kick out from under the ladder entirely.
- A simple field test confirms the angle without any measuring tools: stand at the base of the ladder with your toes touching the feet, then extend your arms straight forward at shoulder height. Your palms should rest comfortably on a rung without needing to lean in or reach up. If you have to do either, the angle is wrong and the ladder needs to be repositioned before you climb.
- Check for cracked, bent, or corroded rails, and confirm every rung is tight, running your inspection along the full length rather than just the section you expect to use most.
- Verify spreader braces lock fully on a stepladder, and extension locks engage securely on an extension ladder, before any weight goes on the ladder, not after you're already a few rungs up and discover something didn't catch.
- Place the ladder on firm, level ground, never on boxes, barrels, or any other improvised surface to gain extra height. An unstable base undermines the correct angle even when the angle itself was set properly, since the base can still shift or sink unevenly under load.
- For an extension ladder reaching an upper landing, the side rails must extend at least 3 feet above that landing surface. This is not a cosmetic margin; it gives you something solid to hold onto during the genuinely most dangerous moment of the climb, the transition from the ladder onto the landing itself, rather than forcing you to step off blind with nothing left to grab.
- Never use a ladder with any identified damage. A ladder with a cracked rail, a loose rung, or a non-functioning lock should be tagged and removed from service entirely, not used cautiously "just this once."
Why this specific check matters more than the others
Of the several distinct causes behind documented ladder fall incidents, an incorrect setup angle causing the base to slide out accounts for the largest single share, roughly 40 percent. This makes angle and footing genuinely the highest-value items in a pre-use check, worth more deliberate attention than a quick visual scan. A ladder that looks structurally fine in every other respect can still fail through this specific mechanism if the angle was never actually checked.
Quick reference
- Three points of contact: two hands and one foot, or two feet and one hand, at all times. Carry tools in a belt or hoist them separately, never climb one-handed because the other hand is full. Applies at any height, not just tall ones.
- Pre-use check priority: angle and footing first, since roughly 40% of ladder injuries trace to the base sliding out from an incorrect angle.
- The 4:1 rule: 1 foot of base distance for every 4 feet of climbing height, producing roughly a 75-degree angle. Field test: toes at the base, arms extended straight forward at shoulder height should rest comfortably on a rung.
- Check rails, rungs, locks, and spreaders before climbing. Firm, level ground only, never boxes or unstable surfaces. Extension ladders need at least 3 feet of rail above the landing for a safe transition.
- Any identified damage means immediate removal from service, not cautious continued use.
Primary sources
- CDC/NIOSH: Ladder Safety: the five major causes of ladder fall incidents, including the roughly 40 percent figure for incorrect setup angle causing base slide-out.
- Ladder Safety Month Week 2: Stats and Trends: the 81 percent of U.S. fall injuries involving a ladder; foot slip/miss as the most common ladder fall mechanism; 50 percent of non-fatal injuries occurring below 10 feet.
- OSHA Ladder Requirements: 29 CFR 1910.23 and 1926.1053 Explained: the precise physical mechanism behind the 4:1/75-degree rule, balancing the backward-tip and base-kickout failure modes.
- OSHA Extension Ladder Safety: Regulations and Penalties: the toes-at-base, arms-extended field test for confirming correct ladder angle.
- 29 CFR 1910.23 - Ladders: official OSHA standard text on the 3-foot landing extension requirement and base stability rules.