Janka Hardness Test

The Janka hardness test measures the resistance of a sample of wood to denting and wear. It measures the force required to embed an 11.28 mm (.444 in) steel ball into wood to half the ball’s diameter. This method leaves an indentation. A common use of Janka hardness ratings is to determine whether a species is suitable for use as flooring.

Picking The Right Nailer For The Job

Freeman offers seven different flooring nailers that all specialize in different jobs.  It is important to make sure that you pick the correct nailer for your specific type of flooring job.  There are two major types of floor that are used in today’s standard market Engineered Hardwood and Solid Hardwood.

Engineered Hardwood Nailers

Engineered hardwood floors are made of a top and sometimes bottom layer of actual hardwood and a center piece normally consisting of plywood or a durable plank.  Freeman currently offers three flooring nailers that specialize in engineered hardwoods.  These nailers are listed below.

Solid Hardwood Nailers

Solid hardwoods are made completely out of a solid piece of hardwood.   This can make finding the correct nailer for your job difficult because, of the large range of densities in different types of hardwood flooring.  Freeman currently carries seven different types of hardwood flooring nailers.  These nailers and the Janka density ratings these guns are recommended for are listed below and show on the chart below.

Flooring nailers that can be used for flooring with densities ranging from 0-1700 on the Janka scale.

Flooring nailers that can be used for flooring with densities ranging from 0-3400 on the Janka scale.  These nailers specialize in exotic flooring and stranded bamboo.

Flooring nailers that can be used for all densities on the Janka scale.  This nailer specializes in extremely dense and exotic hardwood.

Please also refer to the flooring chart below for nailers and their specialized types of flooring on the Janka scale.


Flooring Installation Info.

Before Starting flooring installation make sure the size of the foot that is connected to the nailer matches the size of the flooring being installed.  Then ensure that you have the correct length staple or cleat for the flooring and sub-flooring being nailed into.  While nailing make sure that the groove is inserted into the tongue of the previous board and the staple/cleat is being fired into the tongue of the board.  The power of the mallet hitting the nailer should ensure that the board bing fastened is pressed firmly up agains the previous board.  When installing flooring nails should be spaces every 8-10 inches for boards 2″- 2 3/4″ wide, every 6-8 inches for boards 3″-3 3/4″ wide,and every 6″ for boards 4″-7″ wide.