JANKA HARDNESS SCALE PDF

The hardness of a wood is rated on an industry wide standard known as the Janka test. The Janka test measures the force required to embed a. This test is one of the best measures of the ability of a wood specie to withstand denting and wear. It is also a good indicator of how hard a specie is to saw, mill and nail. There are many things to consider when choosing your wood, including the hardness, natural colour of the wood, the grain and the stability. Stability is defined by the level of flux, expansion and "movement" a wood will have when exposed to different humidity levels.

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A Janka rating is a hardness estimate given to wood. In hardwood flooring, the score is used to determine the durability of hardwood species that it might be suitable for a home. Use this guide to understand precisely what each rating means for a better likelihood of choosing the right hardwood flooring. Tasked by the Department with scientifically measuring the hardness for U. Similar indentation hardness tests are used throughout engineering to discover the hardness of various materials.

By understanding the hardness, manufacturers know how much wear and tear different materials can take, which applications to use them in, and can thus create high-quality tools, building materials, and other products.

The Janka hardness test was designed to measure the resistance of a sample of wood to denting and wear. The method is now standardized and anyone can duplicate it in the case that new species need to be analyzed. There is a standard deviation associated with each species.

Softer woods will require less pressure to create an indentation than harder woods. The Janka hardness test, to some degree, replicates such. Lower ratings do indicate that the wood is softer and more prone to damage from furniture, foot traffic, and pets. In reality, all flooring is subject to damage and wear. In the end, the primary factor in how well your wood floors hold up over the years is how you treat and care for them.

While it is advisable to start with a harder wood if you anticipate high traffic and rough use, Janka rating is not the only factor to consider. You should keep your floors clean, protect them with rugs in high-traffic areas, and choose woods and finishes more likely to mask scratches and dents; this can be just as, if not more important. Still, this chart can be used to help you make a species choice based on hardness.

The above chart showcases the typical Janka side hardness for some of the wood species commonly used in flooring. Some woods like Snakewood have Janka ratings of nearly 4, LbF, which is too hard to comfortably cut and otherwise work with when installing floors using traditional methods. Other species are as low on the scale as Balsa at 70 LbF; this, in its raw form, is too soft to withstand typical foot traffic in a home. You will need to take other matters into account such as how the Sun will affect the color of your floors over time, what type of finish you want to use, and the aesthetic appeal of various wood grains.

Come back often to learn more about hardwood flooring. If you have questions about the hardness of a species not listed here, contact a hardwood flooring expert who can answer your questions in detail. This post was originally published on the Macwoods blog on March 29, , and has since been updated for clarity. First, Who Created the Janka Rating? An Precisely-measured force in lbs is then placed on the ball until it is embedded halfway into the wood sample; this leaves a sq mm hemispherical indentation on the plank.

The process is repeated because two areas on the face of each specimen must be tested. All of the collected data is recorded and averaged. Posted in Hardwood Flooring.

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Janka Hardness

Welcome to our Janka hardness scale for bamboo and eucalyptus flooring page. Strand woven bamboo and eucalyptus flooring, on average, have Janka ratings upwards of 3,, which is much higher than traditional wood flooring. Although some tests have shown bamboo and eucalyptus to be over 5, on the Janka scale, the truth is that Janka hardness ratings can vary from lot to lot even when produced by the same factory. The great majority of strand woven bamboo and eucalyptus lots tend to be in the 3,, Janka range.

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Janka Hardness Scale for Bamboo & Eucalyptus Flooring

This number is incredibly useful in directly determining how well a wood will withstand dents, dings, and wear—as well as indirectly predicting the difficulty in nailing, screwing, sanding, or sawing a given wood species. The actual number listed in the wood profile is the amount of pounds-force lb f or newtons N required to imbed a. Who could imagine a wood species that is over three times harder than white oak? On the lower end of the spectrum, basswood has a hardness of around lb f 1, N. I have amassed over wood species on a single poster, arranged into eight major geographic regions, with each wood sorted and ranked according to its Janka hardness.

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