Option A: JK sealing compound
Floor finish according to this option makes the floor 30 minutes fire-resistant
- Lightweight compared to wet-construction
- Limited build-up
- Fire-resistant 30-60 min
- Acoustic performance 12 dBa
To lay the fermacell Flooring Elements a completely supported and constructed underfloor is required because the flooring elements are not cantilevered. The condition of this supporting underfloor needs constructional examination by a structural engineer. There are different underfloors that are possible.
Many renovation projects consist of a wooden underfloor. This underfloor is often made of wooden beams placed at a fixed distance and incorporated into the bearing walls. The stability of the underfloor needs to be in good condition. This is a deciding factor when determining whether the floor needs to be replaced partially, completely and/or if it needs to be adapted. The underfloor needs to be completely rigid, which has enough capacity to support both the new flooring and the bearing weight of the users on the surface.
It is therefore of vital importance to expose the structure of the construction at the start of the renovation activities to determine the state the existing wooden underfloor is in. The surface may not be springy or saggy. In case of an uneven wooden underfloor, a smoothing compound will need to be applied to achieve complete support for the fermacell Flooring Elements. * The constructive underfloor also needs to be dry and level.
The structural engineer needs to approve the underfloor construction including the applied fermacell Flooring Elements. Of course, this applies for all underfloor constructions, not just wood.
*For other types of underfloor constructions, see fermacell handbook or ask for tailor-made advice.
The fermacell Flooring Elements are secured using lip welding with fermacell Flooring Element glue. The lip welding is mechanically secured using aluminium brad nails from fermacell, to achieve the needed pressure and fixate the elements during the setting of the glue. These nails do not need to be removed before grinding, because they are made of aluminium which the “floorgrinder” can effortlessly grind through.
After fixing the flooring elements, the patented “floorgrinder” from JK floorheating is used to grind slots into the flooring elements. The released dust, separated with a HEPA filter, is re-used in the JK sealing compound or in the manufacturing of the fermacell Flooring Elements. During the preliminary process a transmission calculation needs to be made according to the NEN-EN 12831-1-2017 and the derived ISSO publication 51. JK floorheating has secured the upward releases by an accredited laboratory. This can lead to a slots pattern which is made using the program liNear.
After grinding and before the heating pipes are placed, the surface needs to be cleared of any residual dust using an industrial vacuum cleaner. After this the JK flextube Inverse Soft floorheating pipes of ø 14 x 2 [mm] are laid into the slots, which are suitable for a pressure class of PN10. The heating pipes are covered by the Kiwa KOMO certification. The same goes for the manifold connections, according to BRL 5602.
The heating pipes are then sealed with the JK sealing compound. This is a two component, solvent-free sealing layer with a basis of epoxy resin. It is called a sealing layer because it in fact seals the heating pipes. This sealing layer has a processing time of approximately 25 minutes. The required conditions* for using this sealing compound are: a minimum surface temperature of 10 [°C] and 3 [°C] above dew point. A room and processing temperature of at least 15 [°C], maximum of 30 [°C] and an optimal temperature of 20 [°C] and a maximum relative humidity of 80 [%]. These conditions apply to both the processing and the drying of the product. After approximately 16 hours the surface will be walkable and within 24 hours after that the next layer will need to be applied. This time needs to act as a guideline and should not be exceeded as the sealing compound is not a work layer.
*These conditions are necessary for the correct realisation of the build-up.
If a client chooses a system that falls under the warranty of Uzin Utz, from this step onward the company that is responsible for the floor finish will need to consult Uzin Utz for advice on the proper floor finish and needed products to achieve this. The reason for this is that when sealing the heating pipes with the JK sealing compound, a smoothing compound of at least 5 [mm] is needed according to the warranty. Which smoothing compound is the correct one for your floor finish can be advised by Uzin Utz. Before the smoothing compound can be applied, a layer of floor primer is needed to make the smoothing compound stick properly. The necessary type of floor primer also requires advice from Uzin Utz, to see which specific type works best.
As mentioned before, a consultation with Uzin Utz and other third parties will determine which smoothing compound is fit to use. Without a smoothing compound JK fermafloor cannot give a guarantee on the flooring system according to warranty system of Uzin Utz.
This floor finish will provide a 30-minute fire-resistance.
After applying the advised smoothing compound a couple of different floor finishes are possible.
Uzin Utz NL offers 10 years certainty with their warranty system. Uzin Utz NL come to an agreement with the client specific for their project. Free of cost. For this one of 25 experienced Technical Commercial Advisors will be linked to the projects for tailor-made advice with an extensive assessment. These advisors also have the required knowhow of the complete flooring industry, both in underfloor and floor finishing’s ranging from carpet, PVC, linoleum, natural stone, parquet and cast floors. The Uzin Utz warranty system is a system warranty and covers the complete build-up from floor primer to floor finish.
The advice Uzin Utz NL provides is clear and explicit and based on an extended assessment of the project. The products have been tested with nearly all types of floor finishes, such as carpet, parquet or tiles*. They have come up with solutions to virtually every technical issue possible which means that valuable experience can be used when giving advice for new projects.
More detailed information can be found in Uzin Utz’s Warranty brochure.
*For advice on large tiles it is also possible to consult fermacell.