Solid Hardwood Flooring | Commercial / Residential

C 1.2


Junckers solid hardwood floors for residential and commercial use are based on 22 mm and 14 mm solid 2-strip boards and 15 mm and 20.5 mm solid planks

Junckers solid hardwood floors are all suitable for use i combination with under floor heating.

All floors can be laid as floating floors using the Clip System or glued down to the subfloor using the Glue Down System. Furthermore, 22 mm and 20.5 mm boards can be installed as load bearing floors, nailed to battens/joists using the Batten System.

Fig. 1 shows the layout of the Junckers Technical Information System concerning floors for residential and commercial use.

Please note that full information on a floor system comprises the data in General Information, System Information, Specifier's Information and Laying Instructions

An example of full information on e.g. Junckers Clip System is: C 1.0 - General Information, C 1.1 - Clip System Information, C 1.1.1 - Specifier's Information and C 1.1.2 - Laying Instructions.


The information provided in the Junckers Technical Information applies to specification of building materials/components as well as functional aspects of floor structures, which include Junckers 2-strip board or plank floors.

Please note that Junckers Industrier A/S accepts no liability for functional characteristics of floor structures whose materials or use deviate from the specifications, or whose construction deviates from the directions given.


Junckers solid hardwood floors can be laid in humidity conditions ranging from 25 to 85% relative humidity (RH). However, in order to keep movement of the floor due to changes in the humidity to a minimum, the humidity range should not vary more than 30% RH during the year. Examples of humidity ranges are: 25-50%, 35-65% and 60-85% RH. In addition to this the relative humidity should be stable for extended periods of time during the year.

The relative humidity of residential and commercial buildings is usually between 35 and 65% RH (UK). Our instructions are based on this range. Parameters such as operating temperature and method of ventilation used during the year determine whether the humidity level can be maintained naturally or must be controlled in certain periods. Should deviations be expected, it is advisable to contact Junckers Technical Service Department.


The building must be weathertight. The heating system must be installed and tested, and during the heating season should be in operation. Cast concrete elements, screeding and other wet trades which can contribute moisture to the building, e.g. tiling, plastering and priming of paintwork, must also be completed and dried out.

Before materials are delivered the relative humidity of the building must be within the expected range for the building when in use, e.g. 35 - 65%, and the temperature must be approx. 20°C (UK).



Solid 2-strip boards and planks should always be laid immediately after delivery. Other than for checking, the packaging should not be opened until just before laying begins.

With batten floors the boards are secret nailed to battens/joists using machine nails or by hand nailing in accordance with the 10 board rule, which is based on the expected maximum relative humidity in the building during the year (refer to the specifier’s information for each installation method).

With the Glue Down System the boards are installed using the correct thickness of spacer between each board in accordance with the 10-board rule. (refer to the specifier’s information for each installation method).

Clip system floors are laid as floating floors, and the clip size is determined according to the expected maximum relative humidity in the building during the year (refer to the specifier’s information for each installation method).


To ensure that a floor system has acceptable properties, the floor should be sufficiently elastic and yet give acceptable deflection during use. Furthermore, the load bearing strength of the floor system must be adequate for the actual use.

The stiffness and load bearing strength of a floor system in relation to distributed and point loadings will depend on several factors. For batten systems they will depend on e.g. board type, the spacing of the battens and the packing, while for floating floors they will depend on the board type, the inter-mediate layer and the type of subfloor.

Junckers floor systems can be specified for use in residential buildings, offices and commercial premises, assembly halls and shops. The areas of application of the different floor systems are stated in the Specifier's Information for each floor system in relation to the load classes in EN 1991-1-1, see Table 1.

The point load will usually determine the degree of both stiffness and load bearing strength criteria.

In the case of extraordinarily high loads, e.g. exhibitions, etc., the load bearing strength of the floor systems can be increased by overlaying the floor with additional load distributing sheets such as plywood.

In addition to the loads stated in Table 1, loads can also be imposed by rolling equipment. The Specifier's Information datasheets give information on rolling loads on floor systems. For specification of two common wheel types on rolling equipment, see Table 2.


It is not normally necessary to cover floors during the construction period. Should covering nonetheless be considered necessary, it should be with strong floor cardboard or similar, which is not glued to the floor. In areas subject to special loads and exposure, e.g. corridors and ground floor premises, this covering can be replaced by/or supplemented with hard fibreboards or similar. See also G 1.0. 


Day-to-day vacuum cleaning and damp mopping. For large areas floor cleaning machines may be used, provided that the water consumption is kept to a minimum. See also G 1.0.


For more than 80 years Junckers has provided extensive service. Junckers Technical Service Department and our network of service and sales consultants are available with advice and guidance before, during and after floor laying.