Arborist

SRT (stationary rope technique) uses a single fixed rope that the climber ascends with mechanical devices or friction hitches, with no movement at the anchor. It is more efficient in large trees and for extended aerial work. DdRT (doubled rope technique) routes the rope through a high anchor point and back to the climber, giving a 2:1 mechanical advantage for ascending and allowing the rope to move through the anchor. DdRT is the traditional North American technique and remains widely used, particularly in smaller trees and for climbers trained in body-thrust methods. Most ARMBURY arborist climbing ropes are suitable for both systems; product pages specify compatibility.

Yes. ARMBURY arborist climbing ropes and rigging gear meet the requirements of ANSI Z133, the American National Standard for Arboricultural Operations, which specifies minimum breaking strength, design factors, and inspection requirements for climbing and rigging systems used in professional tree care. Technical documentation and declarations of conformity are available for all arborist products. ARMBURY is a TCIA (Tree Care Industry Association) member company.

Mechanical devices (ascenders, descenders, and redirect systems) perform best on ropes with a firm, consistent cross-section. Double-braid 24-strand constructions are generally preferred for device-based SRT work because they are round, firm, and feed smoothly through mechanical systems. ARMBURY's 11.5mm 24-strand braid arborist climbing rope is specifically designed for compatibility with the current generation of mechanical climbing devices. Verify device manufacturer specifications for compatible rope diameter and construction before purchasing.

ARMBURY offers hitch cords and prusik loops made from a 50% polyester / 50% aramid blend. The aramid content significantly increases heat resistance compared to all-polyester cords — important in applications where the hitch generates friction heat, such as use with mechanical redirect systems, cambium savers, or in high-heat-generating hitch configurations. The blend also improves overall durability without the stiffness of all-aramid materials. ARMBURY hitch cords are available in the WESEN HITCH CORD and WESEN SLING formats.

Climbing ropes are designed for the dynamic and static loads generated by a climber's weight and movement. Rigging ropes handle the more severe shock loads generated by cutting and lowering sections of wood. Rigging ropes require higher breaking strength, greater abrasion resistance (particularly at contact points with wood and hardware), and construction that withstands repeated loading cycles from falling sections. ARMBURY's rigging line includes bull ropes with urethane coating for abrasion resistance and 12-strand hollow-braid ropes designed for splicing custom rigging solutions. Do not use climbing ropes for rigging unless specifically rated and approved for that application.

The right diameter depends on your climbing system and preferred handling. The most common arborist climbing rope diameters are 11–12 mm. Thinner ropes (11–11.7 mm) are lighter and preferred for SRT and mechanical device work. Heavier 12 mm ropes provide more grip for body-thrust and friction-hitch DdRT systems, and are generally more durable in high-use environments. Verify the compatibility of any rope you're considering with your specific mechanical devices — manufacturer specs will define the compatible rope diameter range.

Retire an arborist climbing rope immediately if you observe sheath damage (cuts, glazing, or excessive abrasion), core protrusion, stiff or soft spots, or any damage from a significant dynamic load event (such as an uncontrolled fall or severe shock load). In the absence of visible damage, consider frequency and intensity of use: ropes used daily in heavy production climbing environments should typically be retired after 1–2 years. Annual retirement is a conservative best practice for ropes in frequent commercial use. Follow the manufacturer's retirement criteria, which are included in the user instructions provided with every ARMBURY product.

ARMBURY arborist climbing ropes are designed and certified for professional tree care applications. Recreational tree climbers may use these ropes if they have appropriate training and understand the differences between recreational and professional tree climbing systems. Recreational tree climbing does not have a single governing standard; ARMBURY's arborist ropes exceed the ANSI Z133 requirements used in professional arboriculture. Note that arborist ropes are not designed for sport rock climbing and should not be substituted for UIAA-certified dynamic ropes in lead climbing applications.