5100-LT Series Fiberglass Lightweight Extension Ladder

>Series Callout
The 5100-LT series Lightweight Performance Fiberglass Extension Ladder utilizes new fiberglass technology which allows the ladder to be up to 12% lighter than standard Type IA fiberglass extension ladders! It has non-conductive rails making this ladder ideal for working near electricity. With a duty rating of 300 pounds, this series is durable and long lasting. The exclusive 3-piece rung-to-rail connection means twist-proof performance on the job. The D rungs are slip resistant and the side rails are interlocking. The dual action feet are for use on hard or penetrable surfaces and swivel easily. The base and fly sections separate easily to use the base section as a single ladder. The durable rail shield bracket and shoe help protect the bottom of the rail.


  • Exclusive 3-piece rung-to-rail connection means twist-proof performance
  • 1-5/8 in slip-resistant D-rungs
  • Interlocking side rails with internal rail guides on bottom of fly section securely connect rails
  • External guides at top of base section securely interlock rails
  • Rugged gravity sping locks operate smoothly
  • Base and fly separate easily to use base section as single ladder
  • Durable rail shield bracket and shoe with slip resistant pad and spur plate
  • Molded rung braces on bottom step for increased durability

Performance Overview

SizeStyleApprox. Closed LengthReach HeightLoad Capacity
16 ft -- 28 ftLightweight98.88 in -- 170.88 in15 ft -- 27 ft300 lb


Rung Dimension
13-5/8 in x 1-3/5 in


Model No.SizeMax. Safe Working HeightMax. Open Extended LengthSection x RungsApprox. Closed LengthReach Height
5116-LT16 ft13 ft13 ft2 x 898.88 in15 ft
5120-LT20 ft19 ft17 ft2 x 10122.88 in19 ft
5124-LT24 ft23 ft23 ft2 x 12146.88 in23 ft
5128-LT28 ft25 ft25 ft2 x 14170.88 in27 ft

Different types of ladders are designed to keep you safe and productive when climbing or standing. Using the wrong style of ladder or simply ignoring the limitations of climbing equipment can result in a fall or serious injury.
Height reach Height is referring to the actual ladder height. Extension ladders should be 7 to 10 feet longer than the highest support or contact point, which may be the wall or roof line. The highest standing level is four rungs down from the top. The highest permitted standing level on a stepladder is two steps down from the top.

Reach height is the maximum reach assuming a 5’6” person with a vertical 12” reach.
Ladders are designed to safely hold up to a specific amount of weight. The Werner Performance System defines five different capacities using a color and star rating system. The Duty Rating is defined as the maximum safe load capacity of the ladder. A person’s fully clothed weight plus the weight of any tools and materials that are carried onto the ladder must be less than the load capacity.

Performance system
Werner offers ladder made from fiberglass and aluminum. Each material has characteristics which make it best for certain applications, or one material may simply fit the personal preferences of the user. For example, if working around electricity users should select fiberglass products due to their non-conductive side rails.