Timber Pole Ladders
|
| ||||||
Pole Ladder Build SpecificationIn House Test Results/ Product Certification
This is to certify that the above product has been tested in-house and achieved the following results. Summary – Shakes. Shakes are visual and surface cracks commonly referred to as checks. These are caused during the natural drying process and occur when the wood comes in to direct exposure to sunlight. Due to the grain structure of the wood, these checks do not compromise the strength of the ladder. 
|
|
- As every log has individual (although similar) properties, results can vary quite considerably between each ladder sample. This is due to variation in density, water content, grain spacing, knot size and location.
- Please note: if the crack appears to run through the thickness of the stile then it will not be a shake (caused by drying effects). In this case the ladder may not be suitable for safe use and should be quarantined.
- All samples passed the strength and bending requirements of BS EN131.
- The results show that the shakes do not have an effect on the strength and load carrying ability of the ladder for safe use.
BS1129 was revised in 1993 when all references to builder’s pole ladders (12) including all the specifications for knots (5.2.4.1), surface checks (5.2.4.2) and spiral grain (5.2.4.3) were removed. All subsequent versions of BS 1129 do not include any reference to Timber Pole Ladders. It was found that these conditions (now removed) had limited effects on the strength of the product and were not realistically (and regularly) achievable considering the nature of the raw materials used in the manufacturing process. In effect, the standard for Timber Pole Ladders is dormant however, we continue to manufacture to the performance characteristics of BS 1129. We have carried out extensive in-house tests to ensure that the strength and performance of Timber Pole Ladders conform to current BS EN131 and the old BS 1129 standards.
THE HAYDOX TIMBER POLE LADDER: BUILD SPECIFICATION.
The Haydox Timber Pole ladder is manufactured in accordance with BS1129* for industrial use. They have a safe working load of 175kg (27.5 stones) and a Duty Rating of 130kg. These ladders are built for the most rugged and frequent use.
POLE LADDER BUILD SPECIFICATION.
Stiles must consist of poles sawn on their longitudinal axis. Minimum dimensions of finished stiles shall be as detailed in the table below.
No odd stiles can be matched.
RUNGS
Rungs are to be free from knots and have a grain no steeper than 1 in 10. Rungs are to be spaced between 250mm and 300mm apart, exceptions are 125mm – 130mm for top and bottom rungs. All rungs are to have a minimum diameter of 32mm i.e. 1.1/4” N.B. The rungs used in the manuf
acture of Timber Pole Ladders are the same as used in the manufacture of Class 1 Timber Extension Ladders.
TIE RODS
Tie rods are placed directly under each rung.
|
SPECIES OF TIMBER FOR STILES. - SOFTWOODS (refers to molecular structure).
|
SPECIES OF TIMBER FOR RUNGS. - HARDWOODS.
|
RESIN POCKETS
These are permitted providing their length is not 1.1/2 times the width of the face on which they occur, the width does not exceed 3mm and depth does not extend to the opposite face.
MOISTURE CONTENT
16% - 22%
These are permitted providing their length is not 1.1/2 times the width of the face on which they occur, the width does not exceed 3mm and depth does not extend to the opposite face.
MOISTURE CONTENT
16% - 22%
