Frequently asked questions / FAQs

 

What do I have to look out for when treating "glueless" floating cork (or lino) parquet with Cortex Finish?
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Can I give sealed "glueless" floating cork parquet an additional varnish finish?
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Can I place additional impact sound absorption under cork parquet or "glueless" floating cork parquet?
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How do I give my floor a thorough clean?
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What residual screed moisture is permissible to ensure successful floor laying (gluing)?
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How can I restore a floor that has been in use for many years?
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Does cork change colour over time, like wood does?
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Why must I level the subfloor before gluing cork parquet?
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Can I lay cork over underfloor heating?
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What adhesive should I choose to lay cork parquet?
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What do I have to look out for when treating "glueless" floating cork (or lino) parquet with Cortex Finish?

 

The most important rule when applying long-term protection is to work wet on wet. What does that mean? When applying the finish with a mop, you can hardly avoid going over some areas twice. So there will be overlaps. That is why you must make sure the first coating applied is still wet when you go over the area again. To achieve this, it is usually enough to proceed as follows:

1. Apply a sufficient quantity of the finish. (for a good coat, 1 bottle for approx. 25 m2/270 sq ft)

2. Use the correct tool. (Cortex mop, never rags or cloths)

3. Make sure the air in the room is not too dry.

If you stick to these rules, there should be no problem applying the finish. The room can be used again after about 2-4 hours.

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Can I give sealed "glueless" floating cork parquet an additional varnish finish?

 

Basically, there are two ways of treating "glueless" floating cork parquet after laying. The first way is to apply a coat of Cortex Finish (as described in Question 1). But a second coat of one of our water-based varnishes is also possible.
First roughen the installed floor, for example, with sandpaper 120. Then, having cleaned the surface of dust from the grinding, you can additionally seal it with a Cortex water-based varnish. Please note: you can walk on the floor again after 24 hours, but the varnish is not finally dry for about 8 days. During this time, do not wipe the floor with a damp cloth or mop and do not lay rugs or carpets. Wait until the drying phase is complete before placing heavy items of furniture on the floor.

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Can I place additional impact sound absorption under cork parquet or "glueless" floating cork parquet?

 

That is not possible for cork parquet because the sound-absorbing material has a lower density then the cork parquet. But under "glueless" floating cork parquet, you can install a sound absorption underlay up to 2 mm (1/13 in) thick. But that is not necessary because Cortex "glueless" floating cork parquet always incorporates impact-sound absorption. The additional impact-sound absorption would not be great enough to justify the cost and effort. In any case, it must be ensured that the maximum height is not exceeded.

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How do I give my floor a thorough clean?

 

After long or particularly heavy use, trails may start to appear on the floor. These can be removed by thorough cleaning. This is done using LOBACARE wax remover.
Of this cleaning agent for varnished surfaces (but also for glueless floating lino parquet), dissolve one litre in 6 to 8 litres of water. Then scrub the floor with a scrubbing brush zone by zone (approx. 2-4 m). Pick up the loosened dirt immediately with a cloth and rinse the cloth in clean water into a bucket. Work with two buckets (cleaning solution and rinsing water). Change the rinsing water often to avoid respreading the dirt.
To seal the floor again after thorough cleaning, you can use a green pad instead of a scrubbing brush. It is then not necessary to roughen the floor. If resealing is not required, a new Finish coating should be applied to glueless floating cork parquet or a coating of FloorPolish Plus applied if Secushield is used.

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What residual screed moisture is permissible to ensure successful floor laying (gluing)?

 

The screed is usually made of cement or anhydride. Some floors may also contain underfloor heating.
The residual moisture of a cement screed is 2.0% (for unheated) and 1.8% (for heated).
The residual moisture of an anhydride screed is 0.5% (for unheated) and 0.3% (for heated).
If there is any doubt about the level of residual moisture (e.g. in a new building), an accurate concrete moisture measurement must be made because excessive screed moisture would certainly damage a newly laid floor.

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How can I restore a floor that has been in use for many years?

 

If a cork floor has been in use for many years, the varnish or oil protection film might have become thinner in especially heavily used zones. In this case, the protection film should be renewed. If it is a varnished surface, it must be thoroughly cleaned first (as described in Question 4). The entire surface is then varnished with one or two coats.In the case of a hard wax oil surface, the heavily used zone is scrubbed clean (e.g. with extrafine steel wool) and partially re-oiled. This is more difficult if there are zones where the protective film has already worn off completely. These zones may have already turned grey from wiping. In such cases, it may be necessary to grind the entire surface clean. This is a time-consuming, dirty and expensive job.
That is why restoration should always be performed in good time. That saves time and money.

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Does cork change colour over time, like wood does?

 

Like all other natural materials, cork is not colour-fast (i.e. light-fast). Unlike wood, which darkens, cork pales. Because paling normally occurs evenly and slowly, it is not perceived as a problem. However, paling from skylights or large floor-level windows is another matter.In this case, the direct sunlight may cause the cork floor to pale unevenly. Because no sealant incorporating a sunlight protection is yet available on the market, it is important to provide protection from sunlight during the sunniest periods. Incidentally: This effect does not occur on linoleum floating parquet. Linoleum is unbeatable for colour-fastness.

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Why must I level the subfloor before gluing cork parquet?

 

Levelling the existing screed (cement or anhydride) has two advantages:

- The subfloor is more level. (Unevenness of the floor clearly shows through when cork parquet is viewed against the light)

- The absorption capacity of the subfloor is adjusted (glue moisture is buffered).

This ensures optimum adhesion of the cork parquet. Before levelling, the subfloor must be prepared with bonding mortar. Bonding mortar and levelling mortar from the same manufacturer should be used.

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Can I lay cork over underfloor heating?

 

The factor that decides whether flooring is suitable for use with underfloor heating is its ability to conduct heat. Both cork parquet and "glueless" floating parquet are safely below the recommended limit of 0.17 m2K/W.

With 0.3m2K/W, "glueless" floating cork parquet is well suited for use with underfloor heating. To ensure good heat transfer between the heated screed and the floating cork parquet, the subfloor should be as level as possible.

In the case of 4mm thick cork parquet, the resistance to heat conduction is even lower (0.05m2K/W). This makes this flooring ideal for warm-water underfloor heating. Use with other types of floor heating, however, is not possible.

The surface temperature of the heated screed should not exceed 28C. If underfloor heating is used, air humidity is greater nearer the floor. We therefore recommend adjusting the air humidity while the heating is in operation.

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What adhesive should I choose to lay cork parquet?

 

Cork contact adhesive D3540. This adhesive is the most suitable for laying cork parquet.

Its advantages:

- long open time (i.e., after the two layers of adhesive have become transparent, you have two hours in which to lay the tile on the adhesive.)

- low consumption (1kg/2.2lb of glue is enough to lay 4m2/43 sq ft of cork.)

Of course, our contact adhesive is free of solvent and meets the EC1 standard, i.e. low-emission during application.

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