How to prepare the concrete base?

The concrete base must be flat, sufficiently dry, cleaned of dust. Before laying the boards, the base must be primed with a primer suitable for glue. Depending on whether waterproofing is required (if there is a risk of moisture getting into the concrete floor) or whether waterproofing is not required, we offer two types of STAUF primers from the German manufacturer:
1) waterproofing primers STAUF VPU 155S -
suitable for creating a vapor barrier for concrete subfloors with moisture up to 3.5% before gluing the parquet with STAUF SMP 930 parquet glue. Suitable for concrete, dry concrete, wooden subfloor, chipboard subfloor, uncoated plasterboard subfloor.

VPU 155S primer is ready to use, it does not contain solvents and creates a dust-free surface under the adhesive layer. Applied in two layers, a waterproofing layer is created - a vapor barrier. When applying with a roller, the consumption for the 1st layer is 150 g/m2, for the second layer (moisture barrier) 250 g/m2. Drying time for the first layer 30 to 45 minutes, for the second layer 2 hours at a temperature of 20 degrees C.

2) dispersion primers STAUF VPD 130 -
suitable for fixing the surface of concrete, dry concrete, wooden subfloor, chipboard subfloor, uncoated plasterboard subfloor.

The consumption of VPD 130 is 120 g/m2 when applied with a roller. When using, before applying the glue, the primer is diluted with water in a ratio of 1:1. Drying time depends on the substrate. The use of a primer under STAUF SMP 930 adhesive does not improve the adhesive bond, however, it provides fixation of the surface and is desirable in cases where the surface is fragile and dust may form on the surface before laying.

STAUF VPD 130 cost post is significantly cheaper, but does not provide moisture insulation.

What is the maximum allowable concrete moisture?

The moisture content of cement concrete before laying the floor boards should not exceed 1.5%.

How to install solid wood floorboards?

Solid wood floorboards are more difficult to install than glued laminated floorboards. Solid wood boards should preferably be glued to the base. As a result of room humidity and temperature changes, greater stresses and deformations occur in them, so the surface must be carefully prepared and it is preferable to use two-component adhesives for gluing them. Here you can familiarize yourself with the article published in issue 7 of 2023 of the magazine "Dari pats" about laying solid wood floorboards on concrete .

What should be the humidity of the room during the laying of floorboards?

The air humidity in the room should be between 40% and 50%. Often, the floor is laid immediately after finishing the walls and ceiling. When the finishing materials of the walls and ceilings of the rooms dry, a large amount of moisture is released. The floorboards may swell when receiving it. Later, as the boards dry, they will shrink and gaps may appear between them. In order to prevent this, before laying the floor in such cases, air drying equipment should be used to reduce the humidity in the room.

Is it possible to lay the floor without gluing to the base?

Yes, it can be done. Then a shock-absorbing material should be laid under the floor and it is preferable to glue the boards together. However, such a floor has its drawbacks - it is impossible to restore it qualitatively by sanding. Such a floor will also conduct heat worse if the boards are placed on the heated floor.

What glue to choose for gluing boards to the base?

In order for the wooden floor to last a long time and be durable even in difficult operating conditions, it is important to use a suitable parquet glue. SIA "Amber Wood" offers one-component and two-component polyurethane parquet adhesives from the German manufacturer "Stauf". What are the differences between these adhesives and which adhesive should I choose?

Single -component adhesives are easier to apply, they do not need to mix two components, therefore it is impossible to make a mistake with the ratio of components when mixing. One-component adhesives are a ready-to-use product.
One-component adhesives also have disadvantages . Here are some of them:
1. Adhesives react under the influence of moisture. Moisture for the reaction is absorbed from the surfaces to be bonded or from the air. The speed and quality of the reaction depends on the surfaces to be glued and the humidity of the air! Both too high and too low humidity can lead to poor results.
2. It should be taken into account that the hardening process takes place from the outer layers - too thick a coating will take a long time until the moisture required for the reaction penetrates the inner layers. There are limits to the thickness of the layer.
3. A significant drawback – a relatively long curing time.
4. The glue reacts with air humidity. Hermetic storage of glue must be ensured. If the glue has a chance to react with air humidity, it will no longer be usable after a certain time.
5. In case of excessive humidity, the rapid formation of carbon dioxide in the glue may cause it to foam. As a result, the adhesive joint may swell during installation.
6. In case of too low humidity, the glue joint will not harden properly and there is a risk of the parquet detaching from the subfloor.

Two-component glues are cheaper and more durable, they can be stored relatively longer without the risk of damage, their hardening practically does not depend on the humidity of the surfaces to be glued and the humidity of the surrounding environment, they provide a stronger glue connection (which is not always an advantage in the case of a wooden floor). They react faster and react simultaneously throughout the entire thickness of the adhesive layer, regardless of the thickness of the layer (important if the base floor is not perfectly straight).
Two-component adhesives also have disadvantages. Here are some of them:
1. The adhesive reacts relatively quickly and has a limited "open" time after mixing. You have to work fast.
2. The glue hardens quickly on tools and all surfaces. Care should be taken so that the glue does not get on the parquet or other finished surfaces.
3. When mixing the components, it is necessary to weigh and mix them in small amounts - this is time-consuming and there is a possibility of making a mistake with the proportions.

How big is the glue consumption?

About 0.6 kg/m² to 1.5 kg/m² floor . Consumption will be higher on uneven surfaces.

Is it possible to lay the floorboards on a heated base?

Yes, double-layer solid wood floorboards are suitable for laying on heated floors.

What is the maximum permissible temperature of the heated floor during operation?

If the boards are laid on heated floor bases, the temperature of the heated floor surface must not exceed 27°C .

Is it possible to lay "floating" floorboards on heated floors?

If the width of the floorboards does not exceed 240mm, they can be laid as a "floating" floor on a special underlayment by gluing them to each other. However, heat transfer will be weaker than if the floorboards were glued to the subfloor.

How long is the acclimatization process of the floorboards/parquet after they are delivered to the facility?

For floorboards and parquet, the acclimatization process is not necessary, it is even undesirable. Laying should begin immediately. All products are stored in the factory under controlled humidity and temperature conditions. Such conditions (air humidity from 40% to 50%) cannot always be ensured in the construction site.

Is it possible to store floorboards and parquet in the construction site?

If possible. The air humidity in the room should be between 40% and 50%. The air temperature should be above 5°C.

Is it possible to treat floorboards or parquet with natural oil after laying them?

Yes. Untreated boards or boards oiled with oxidative oil can always be treated with an additional layer of oil. Consult with the laying master about the possibilities.

Is it possible to treat floorboards or parquet with hard wax after laying them?

Yes. Consult with the laying master about the possibilities. In this case, a thicker layer of hard wax will form on the surface. In addition to improving wear resistance, it is recommended to use hard wax together with a hardener.

Is it possible to treat floorboards or parquet with varnish after laying them?

Yes, if previously finished at the factory with hard wax with added hardener. Consult the factory for options.

If the finish is made with oxidative curing natural oil without hardener or UV curing material, further treatment with varnish or other finishing materials after laying is not possible.

Is it necessary to create an expansion joint in the floor covering?

If the floorboards are glued to the subfloor in the entire plane, then the compensation seam is not necessary.