How to Make a Rope Ladder: From DIY to Marine & Embarkation Standards

Making a rope ladder requires two parallel side ropes, a series of rigid or rope rungs, and secure knots or lashing at every rung-to-side-rope junction. The core process is: cut side ropes to length, mark rung spacing at 30–35 cm intervals, attach each rung with a clove hitch or square lashing, and finish the top ends with fixed loops for attachment. For a standard 3-metre domestic or utility rope ladder with ten rungs, the entire build takes two to four hours with basic materials. Marine and embarkation rope ladders follow the same structural logic but must meet strict international standards — including IMO SOLAS requirements — that specify exact rung dimensions, rope diameter, and load ratings.

Materials You Need Before You Start

Selecting the right materials is the most important decision in rope ladder construction. Under-specified rope or weak rungs are the primary cause of ladder failure. The table below summarises the recommended specifications for three common use cases.

Rope Type and Why It Matters

3-strand laid rope is strongly preferred over braided rope for rope ladders because the lashing and knotting used to secure rungs grips more reliably on a twisted surface. Braided ropes are slippery under lashing tension and can cause rungs to migrate over time. Polyester offers the best combination of UV resistance, low stretch (approximately 3% at working load), and weather durability for outdoor use. Nylon stretches up to 15–20% under load — acceptable for some applications but problematic where consistent rung height is needed. Manila is the mandated material for SOLAS-compliant embarkation ladders due to its rougher surface and superior grip when wet.

Rung Selection

Rungs must resist both the bending load of a person's weight and the crushing load of the lashing knots. For hardwood dowels, use a species with a bending strength above 60 MPa — ash, oak, and hard maple all qualify. Softwoods such as pine fail at significantly lower loads and should be avoided. Each rung should be pre-drilled with a 16–18 mm hole at each end if using a rope-through-rung construction method, or left intact for surface lashing methods.

How to Make a Rope Ladder: Step-by-Step Instructions

The following instructions describe the construction of a general-purpose adult rope ladder, 3 metres long with 10 rungs at 30 cm spacing. Adjust quantities proportionally for other lengths.

What You Will Need

• Two lengths of 14–16 mm 3-strand polyester rope, each 4 metres long (the extra length accounts for knots, which consume approximately 8–10 cm of rope per junction)
• Ten hardwood dowel rungs, each 450–500 mm long × 32 mm diameter, pre-drilled with 16 mm holes 20 mm from each end
• A tape measure, permanent marker, and sharp knife or rope cutter
• A lighter or heat gun to seal synthetic rope ends (prevents fraying)
• A spike or fid (a tapered tool for opening rope strands when tying)

Step 1 — Prepare the Side Ropes

Cut both side ropes to identical length and seal the cut ends immediately with heat. Lay both ropes parallel on a flat surface, 450 mm apart (matching the rung length minus the rope diameter on each side). Using the tape measure and marker, mark both ropes simultaneously at the top anchor point and then at 30 cm intervals down the full length. You should have 10 marks on each rope — these are your rung attachment points. Marking both ropes at the same time ensures perfect alignment across the ladder width.

Step 2 — Form the Top Attachment Loops

At the top of each side rope, tie a fixed eye using a bowline knot. The bowline creates a non-slip loop that will not tighten under load — the correct choice for a fixed anchor point. The finished eye should be large enough to pass over a standard 25 mm carabiner or hook. Pull each bowline tight and confirm the loop size is consistent between the two side ropes so the ladder hangs level.

Step 3 — Attach the Rungs Using the Through-Hole Method

This is the most secure attachment method for drilled rungs. Starting at the topmost mark on both side ropes simultaneously:

1. Push the side rope through the pre-drilled hole at one end of the rung until the mark aligns with the outer face of the rung.
2. Tie an overhand stopper knot (or figure-of-eight knot for additional bulk) in the rope on the underside of the rung, pulling it tight against the rung face. The rung now rests on the knot and cannot slide upward.
3. Repeat on the opposite side rope so the rung is held level between both knots at exactly the same height.
4. Move to the next mark 30 cm below and repeat for all remaining rungs.

After attaching all rungs, hang the ladder from its top loops and check that every rung is horizontal. Any rung that tilts indicates unequal knot positions — loosen and re-tie as needed before the knots fully bed in under load.

Step 4 — Finish the Bottom Ends

The rope ends below the bottom rung can be finished in one of three ways: whipped with twine, back-spliced (the strongest and most seamless finish), or tied with a large stopper knot. For outdoor or marine use, a back splice is strongly recommended — it prevents fraying without adding a bulky knot, and it is inherently waterproof. A simple whipping with waxed twine is acceptable for indoor or short-term applications.

Step 5 — Load Test Before Use

Before trusting any self-made rope ladder with a person's weight, apply a proof load of at least 1.5× the intended working load for a minimum of one minute. For a ladder rated to carry one adult (approximately 100 kg), apply 150 kg of static load — this can be achieved by hanging weighted bags from the lowest rung while the top loops are secured to a fixed overhead point. Inspect every knot and rung junction after the test. Any signs of slipping, cracking, or deformation require the affected section to be re-made.

Alternative Rung Attachment Methods

The through-hole method described above is the most reliable for permanent ladders. Two further methods are commonly used depending on materials available and intended use.

Clove Hitch Lashing (Surface Mount)

Used when rungs are not drilled and the rope is simply tied around the rung surface. Tie a clove hitch around each end of the rung at the marked position on the side rope, then add two or three frapping turns to tighten and lock the hitch. This method is faster than the through-hole approach but requires regular inspection — clove hitches can loosen under repeated load cycling, particularly on smooth dowel surfaces. Adding a half-hitch lock after each clove hitch significantly improves retention.

Rope Rungs (All-Rope Construction)

A fully rope-based ladder uses horizontal rope sections as rungs instead of rigid dowels. Each rung is formed from a separate length of rope tied between the two side ropes using square knots or sheet bends at each end. Rope rungs are lighter, more flexible for storage, and will not crack or splinter. However, they are narrower underfoot, less comfortable for extended climbing, and require a rope of at least 16 mm diameter to provide adequate foothold. This construction is widely used for emergency escape ladders and cargo nets.

What Is an Embarkation Rope Ladder

An embarkation rope ladder is a specific type of marine rope ladder used to allow crew and passengers to board or disembark a ship — particularly into survival craft (lifeboats and rescue boats) during emergencies. It is a mandatory piece of safety equipment under SOLAS (Safety of Life at Sea) regulations, specifically covered under SOLAS Chapter III, Regulation 11, and the associated LSA (Life-Saving Appliances) Code.

Unlike a general-purpose rope ladder, an embarkation ladder must be capable of use in rough sea conditions, by people who may be injured, cold, or wearing life jackets, descending from a ship's side to a lifeboat station that can be several metres below the embarkation deck. The design must therefore prioritise stability, non-slip performance in wet conditions, and ease of use under duress.

SOLAS Requirements for Embarkation Rope Ladders

The LSA Code Section 6.1 specifies the following mandatory requirements for embarkation rope ladders:

• Side ropes: Two continuous lengths of manila rope, each with a circumference of not less than 65 mm (approximately 20–21 mm diameter). No joints are permitted in the side ropes except at the bottom of the ladder.
• Rungs: Hardwood, free of knots and warping, with a non-slip surface. Minimum width of 480 mm, minimum depth of 115 mm, and minimum thickness of 25 mm.
• Rung spacing: Uniform, between 300 mm and 380 mm, so the ladder is equally usable from the top and bottom.
• Stiffeners: Spreader devices at intervals not exceeding 9 rungs to prevent the ladder from twisting during use.
• Load test: The ladder must be capable of supporting a load of 750 N (approximately 75 kg) per rung simultaneously across the full length without deformation or failure.
• Length: Sufficient to reach from the ship's embarkation deck to the waterline under the most unfavourable loading and trim conditions.

Manila rope is mandated specifically for SOLAS embarkation ladders — synthetic ropes are not accepted as a substitute in this application. Manila maintains grip when wet, does not stretch significantly under load (less than 5% elongation at working load), and provides a tactile roughness that synthetic fibres cannot replicate when hands and footing are wet or gloved.

How to Make an Embarkation Rope Ladder to SOLAS Standards

Building a SOLAS-compliant embarkation rope ladder for commercial use requires type approval from a recognised classification society (such as Lloyd's Register, DNV, or Bureau Veritas). However, understanding the construction method is essential for vessel operators who need to inspect, maintain, or certify their equipment — and the technique is directly applicable to building high-specification marine rope ladders for non-commercial use.

Preparing the Manila Side Ropes

Cut two lengths of 65 mm circumference (≈ 20 mm diameter) 3-strand manila rope to the required length, adding at least 1.5 metres extra at the top for securing to the ship's structure. Manila rope ends are seized with tarred marline whipping (not heat-sealed, as manila is a natural fibre and will char rather than fuse). Lay both ropes parallel on the working surface at 480 mm separation — the minimum rung width.

Preparing and Attaching the Hardwood Rungs

Each rung should be cut from straight-grained hardwood (teak, ash, or iroko are traditional choices for marine use due to their dimensional stability and resistance to swelling). Sand smooth and treat with a non-slip coating or carve shallow grooves across the upper face. Drill holes 20 mm from each end of the rung, sized to pass the manila side rope with light resistance — approximately 22–24 mm diameter for a 20 mm rope.

Thread the side rope through each hole and secure with a figure-of-eight stopper knot below each rung. The figure-of-eight is preferred over a simple overhand knot for embarkation ladders because it is larger, more secure, and easier to inspect and untie. After tying each stopper, drive the knot firmly against the rung underside by applying body weight to the rung. Re-check spacing — rungs must be between 300 mm and 380 mm apart, measured between the upper faces of adjacent rungs.

Fitting Anti-Twist Stiffeners

At every ninth rung or less, install a rigid spreader bar. This can be a wooden batten or metal rod secured across the back of both side ropes with heavy lashing, preventing the ladder from rotating and twisting when a person's weight is applied asymmetrically. Without stiffeners, a long unsupported ladder can spin 90° or more during descent — a significant safety hazard in a real emergency.

Securing the Top Attachment

The top of an embarkation rope ladder must be secured to the ship's deck fittings using the extra rope length left at the top of each side rope. Pass each side rope around a dedicated bollard, cleat, or through a pad eye rated to the ladder's full working load, and secure with at least three round turns and two half-hitches. The attachment point must be directly above the ladder's operating position — a diagonal pull creates lateral loading that can unseat the ladder from the ship's side.

Marine Rope Ladders Beyond Embarkation: Other Shipboard Uses

The term marine rope ladder covers a broader category than just SOLAS embarkation equipment. Several distinct types of rope ladder are found aboard ships and at ports, each with different construction requirements.

The Pilot Ladder: Similar Construction, Different Standard

The pilot ladder is the most frequently inspected and regulated marine rope ladder in commercial shipping. It allows maritime pilots — who board vessels while they are underway at sea to navigate into port — to climb from a pilot boat to the ship's deck. Construction is nearly identical to the embarkation ladder, but ISO 799 mandates additional requirements: the four rungs nearest the top must be made of rubber (to reduce slipping where the ladder is hardest to grip), spreaders are required every ninth rung, and the ladder must extend at least 1.5 m above the ship's deck level when rigged. Ports and classification society inspectors check pilot ladders at every port call.

Inspection, Maintenance, and Replacement of Rope Ladders

A rope ladder that appears intact visually may have lost a significant portion of its strength through UV degradation, chemical exposure, or internal fibre fatigue. Regular structured inspection is as important as the initial construction quality.

What to Check at Every Inspection

• Side rope condition: Run your hands along the full length of each side rope, feeling for soft spots (internal fibre breakdown), hard lumps (kinking damage), or stiff sections (chemical contamination). Look for discolouration, UV bleaching, or surface abrasion that exposes inner strands.
• Knot security: Pull each stopper knot firmly by hand. Any knot that moves has loosened and must be re-tied. On older ladders, knots can bed so deeply into the wood that they are difficult to inspect — use a spike to probe the rope around the knot entry point.
• Rung integrity: Inspect each rung for cracks (especially at the drill holes where stress concentrates), rot, delamination, or broken anti-slip surfaces. A rung that produces a hollow sound when tapped has internal rot.
• Rung spacing: Measure spacing between rungs. If any gap has increased by more than 20 mm from the original specification, the stopper knots below those rungs have slipped and must be reset.
• Top attachment: Check the bowline or secured rope end at the anchor point for chafe where the rope contacts the deck edge or fairlead. This is often the first point of failure.

When to Replace a Rope Ladder

The following conditions require immediate retirement and replacement — not repair:

• Any broken or cracked rung
• Any section of side rope where more than 10% of surface strands are broken or abraded through
• Any rope that has been shock-loaded (subjected to a sudden dynamic fall load) — the internal fibre structure is damaged even if the rope appears intact
• SOLAS embarkation and pilot ladders: mandatory replacement every 5 years regardless of apparent condition, as required by most classification societies
• Any ladder that has been exposed to acids, alkalis, or solvents — chemical degradation is invisible to external inspection

For SOLAS-regulated marine rope ladders, inspection records must be maintained as part of the ship's Safety Management System (SMS). Each inspection date, inspector name, condition found, and any corrective action must be logged and available for port state control inspection.

Common Mistakes That Cause Rope Ladder Failure

Most rope ladder failures are preventable. The following errors account for the vast majority of structural failures and safety incidents:

• Using braided rope for lashed rungs: Braided rope is slippery; knots bed down and then creep. Always use 3-strand laid rope for any ladder where rungs are knotted or lashed to the side ropes.
• Incorrect rung length: Rungs shorter than 400 mm give insufficient foot width for safe stepping, especially in boots. Rungs wider than 600 mm are unnecessarily heavy and create excessive side-to-side swing.
• Unequal rung heights: If the knots on either side of a rung are not at exactly the same position on their respective side ropes, the rung tilts. Tilted rungs cause asymmetric loading that can work knots loose over time.
• Skipping the load test: A ladder that has never been proof-loaded before use has unknown actual strength. Knots that appeared tight during construction can loosen significantly when first loaded.
• Storing rope ladders coiled in direct sunlight: UV radiation degrades both natural and synthetic fibre rope. Polypropylene rope loses up to 50% of its tensile strength after 400 hours of direct sunlight exposure. Store all rope ladders in a bag or locker away from light and heat when not in use.
• Using softwood rungs: Pine and similar softwoods have insufficient bending strength and will split at the drill hole under a normal adult load. Only hardwood species with a bending strength above 60 MPa should be used.