EP3907350B1

EP3907350B1 - Assembly for setting the position of boards on the face of a wall and system for installing boards on the face of a wall

Info

Publication number: EP3907350B1
Application number: EP21172357.2A
Authority: EP
Inventors: Michal Krzyzaniak; Artur Jarzab; Konrad Kula; Piotr Zemanek; Katarzyna Klimentowska; Joanna Bandakova; Agnieszka Didyk-Mucha; Krzysztof Placzkiewicz
Original assignee: Selena Industrial Technologies Sp Z OO
Current assignee: Selena Industrial Technologies Sp Z OO
Priority date: 2020-05-06
Filing date: 2021-05-05
Publication date: 2023-08-30
Anticipated expiration: 2041-05-05
Also published as: EP3907350C0; WO2021225460A1; ES2957161T3; PL433894A1; PL3907350T3; EP3907350A1

Description

The invention relates to an assembly of two elements for setting the position of boards on the face of a wall, i.e., the fixing-and-separating element (also called the positioner) and the positioner-pressing wedge that mounts it - system. The invention can be applied in order to set the position of large-format boards, especially gypsum boards, OSB boards bonded to walls, or tiles - adjacent to each other on the top surface of, for example, walls or floors. The subject matter of the invention is also a system for completely installing boards on the face of a wall, to be applied together with the positioning assembly, and it has the same application for completely installing boards together with setting their position on the face of a wall and together with positioning and fixing, especially gypsum boards, OSB boards bonded to walls, and tiles.
Currently, the fixing of large-format boards is done with the use wide range of materials such as powder basedadhesives for boards, e.g. for gypsum boards. Most often, powdered gypsum-based bonding are used which, after being mixed with water, constitute the adhesive. Alternatively, they are screwed to frames. Application of known solutions, i.e. loose materials for bonding boards and frame screws, is time-consuming, requires process breaks for water evaporation, as well as considerable effort and time spent on assembling steel frames and screwing boards to them.
In cases where each large-format board is positioned and fixed (i.e. installed) independently of each other, continuous measurements are necessary using a spirit level and measuring tapes. A particular problem concerns positioning, which is an essential stage in the installing of boards, especially large-format boards. Currently, large-format boards are often installed without a system of mutual positioning - each large-format board is installed independently of each other. This necessitates constant measuring with a spirit level and measuring tapes, and often requires more than one person. Therefore, a major problem with the installation of the boards is that it is difficult to correctly and quickly align the boards with one another on the installation surface. But for any large-format board installation, it is important that the boards be correctly positioned on the wall surface. This causes great difficulty and the need for two fitters. Also, during the installation, the distance between the boards must absolutely be maintained, which is often done with wedges. It is not easy to maintain the minimum required spacing - gap between the boards of, for example, 2-3 mm. Hence the need to develop more effective solutions to precisely position boards in the required way.
In US2016222679 it is described that the assembly for positioning large-format boards on a top surface comprises means for fixing-and-separating for positioning a board on top surface and setting the gap between an adjacent board, and additionally comprises retaining wedge that is mounted to the means for fixing and separating enabling adjacent boards to be evenly placed on the top surface at such a distance in relation to each other determined by the thickness of the means for fixing-and-separating. The means for fixing-and-separating comprise a base formed as resilient foot, which is adapted to be placed under the adjacent boards wherein a grip extends from the base at an angle of 90° whose thickness is adapted to the intended gap between the adjacent boards. Within the grip a narrowing is formed close to the base, wherein the means for fixing-and-separating and the retaining wedge are mutually shaped so that the retaining wedge is adapted to hitch a catch that is formed on the mean for fixing-and-separating so that the retaining wedge presses the adjacent boards to the base after adjacent board have been placed on the top surface. The catch for the retaining wedge is formed on the grip in the opposite direction with regard to the base. The retaining wedge is shaped making adapted to hitch the catch in such a way that after engaging the catch, the retaining wedge presses the adjacent boards to the base surface. US2020087925 describes fastener unit comprises a similar clip - resilient engagement arm for the similar purpose.
Due to the problems from the state of the art, there is a need to develop a comprehensive system dedicated to correctly and completely installing large-format boards - their fixing and effective mutual positioning of so-called drywall.
The invention enables for reduce the working time significantly, eliminating process interruptions to a minimum, and ensures correct fixing of boards on a surface.
The subject matter of the invention is assembly for positioning large-format boards on a top surface that is characterized in that on the grip a pressing clip is formed, wherein the shape of the clip is adapted so as to stably press the upper surface of the board that is fixed to the top surface
Preferably the retaining wedge is U-shaped or U-like in shape, and on one of the surfaces of its arms, on the side of the fixing to the catch a serration is formed, which is shaped so as to match the shape of the catch.
Preferably the opposite direction to the base the grip widens into an end that is a U-shaped flat handle of the grip with a thickness equal to the thickness of the grip, whereas the edge of the lower wall of the handle bevel formed on one side of the edge which constitutes the catch for the retaining wedge.
Preferably, the shape of the catch is determined to the serration so that the retaining wedge is adapted to be hitched to the catch.
Preferably, the height of the grip is between 5 mm and 16 mm.
Preferably the size of base has a span that enables place boards with a thickness of 5 to 16 mm.
Preferably, the pressing clip towards the pressed surface of the clip, there is a protrusion towards the pressed surface, wherein the angle of the protrusion to the pressed position is between 55 and 65 degrees.
The invention further relates to method for setting the position of large-format boards on a top surface, which method consists in fixing adjacent boards at a predetermined spacing, that is characterized in that the method is performed with use of the above mentioned assembly.
The invention further relates to a system for installing large-format boards on a top surface comprising above mentioned assembly.
The system has been performed based on the multi-element assembly for fixing boards, especially gypsum boards.

A) Composition for fixing boards to the top surface - a mixture based on polyurethane in the form of adhesive with foam consistency - an adhesive in the form of a foaming prepolymer consisting of, among others, 2 main ingredients: isocyanate and polyols. The foam consistency is obtained during its use - application onto the surfaces bonded under pressure.
B) Mixture for finishing the fixing, i.e. jointing, in the form of a ready-made filling mixture designed for connecting plasterboards, especially gypsum boards, without the use of a tape, which thanks to the use of appropriate mineral components, polymer dispersions, and the latest generation fibres with a fibrillized structure, ensures good technical and utility properties. The mixture contains mineral components, polymer dispersions, fibres with a fibrillized structure.
C) Joining mixture in the form of acrylic designed for boards, especially gypsum boards as well as for joining the upper edges with the ceiling and the lower edges with the floor and for working the corners

A-C together form a complete system for fixing, including bonding and finishing of large-format boards. The composition of the complete system for installing the large-format boards is therefore the system for fixing, i.e., the three-element system described above, and the positioning assembly. The additional system for completely installing includes the already-described assembly for positioning the boards in relation to each other.

A)

Fast-drying single-component adhesive - glue in the form of foamed polyurethane prepolymer (so-called foam), supplied in aerosol cans with compressed gas, e.g. applied by means of a gun, hardened by air humidity, having the consistency of a highly adhesive liquid before curing, and the consistency of rigid polyurethane foam after curing, intended for fixing large-format

boards, e.g. gypsum boards, to surfaces made of cellular concrete, brick, OSB boards (Oriented Strand Boards - composite flat-pressed boards with oriented strands). This adhesive contains a special composition of polyester resins, modifiers, and polymeric isocyanate, thus ensuring a quick initial grip, a high strength of the joint, as well as no expansion of the joint after application.

The developed formulation of the glue allows to correct the position of the board up to 20 mm within 3 minutes after application, achieving initial hardening after 30 minutes (possibility of carrying out finishing works) and full hardening after 2 hours, whereas traditional glues require several days to fully harden.

B)

Ready-to-apply paste-like filling mixture for finishing the fixing (jointing), including joining of boards, especially plaster boards, consisting of a mix of mineral ingredients, polymer dispersions, and the latest generation fibres with a fibrillized structure. Thanks to the application of microfibre reinforcement, there is no need for traditional use of specialized reinforcing tapes during application, which significantly speeds up work both with the product itself and with the whole system. The product fully hardens after 24 hours, i.e. even 3 times faster than traditional technologies for jointing of plaster boards.
The filling mixture - also called filling mass - based on a composition of acrylic dispersion with low VOC - Volatile Organic Compounds content is adapted for creating low-emissions building-industry chemicals. The product cures without releasing hazardous substances with an unpleasant odour. The dispersion is water resistant, which reduces water adsorption by the finished product.
The mixture of mineral fillers based on calcium carbonate and silicon ensures quick curing and drying of the product and facilitates final working of the hardened filling mass, i.e. painting and polishing. The product fully hardens after 24 hours, i.e. 3 times faster than traditional technologies for the jointing of plaster boards.
Composition of the latest generation of fibres, which increases flexibility of the finished product and resistance to cracking at the place of application. Thanks to the application of microfibre reinforcement, there is no need for traditional use of specialized reinforcing tapes during application, which significantly speeds up work both with the product itself and with the whole system.
The use of rheology-modifying agents allows to obtain a product of paste consistency ready for application. It ensures easy application and spreading of the product and prevents the mass from flowing down from vertical surfaces.
Composition of wetting agents and emulsifiers that ensures very good adhesion to the surface of commonly used construction-industry materials (in particular gypsum boards) without the need to use a primer.

C)

Acrylic for gypsum boards - it is a single-component sealant based on acrylic resins, designed for jointing corners when building with gypsum boards. It is characterized by high elasticity and it is perfect for painting during finishing works. It has excellent adhesion to surfaces typical of the construction industry, including damp surfaces, i.e. gypsum board, concrete, brick, plaster, wood, and stone. It is odourless, as well as resistant to frost and UV radiation. The product contains a sealant based on a mixture of acrylic dispersion of high hardness so that the finished product is easy to work after drying, i.e. it is paintable and polishable.
It also comprises a high-whiteness filler and flexiblity-increasing agents - giving the product high resistance to movement and, at the same time, preventing the application from cracking in the sealing area. After drying, the product is characterized by high resistance to temperature changes, including negative temperatures, as well as UV radiation. The product dries and cures in a short time without giving off any odorous or hazardous substances.
It is easy to use thanks to the careful choice of rheology-modifying agents - easy to squeeze out and apply, yet it does not run off vertical surfaces.
An application can be repaired with the same product, therefore, there is no need to remove the previous layer. Unhardened product can be removed from clothing or tools using water. It is characterized by high compatibility with typical building materials. D) assembly - as described above - for mutually positioning boards on an installation surface.
The invention enables precise, easy installation including fixing (including bonding) and positioning of adjacent boards on the top surface, as well as allows boards of different thicknesses to be joined together and a constant spacing between boards to be maintained without the need for continuous measuring and levelling.
The invention is presented in more detail in the examples and in the drawing, where: fig. 1 shows a rear view of the positioner, fig. 2 shows a front view of the positioner, fig. 3 shows a side view of the positioner, fig. 4 shows the positioner and reveals the sharp tooth-shaped protrusion on the bottom surface of the clip, with example dimensions, figs. 5 and 6 show a side view of the retaining wedge, fig. 7 shows a front view of the retaining wedge, fig. 8 shows the retaining wedge viewed from above, fig. 9 shows a front view of the positioner with the retaining wedge after installation between boards (from the fitter's side), fig. 10 shows the positioner with the retaining wedge after installation between boards, viewed from above.
In the description, the term fixing-and-separating element 1 is used interchangeably with the term positioner 1, retaining wedge 2 - with setting wedge 2, and protrusion - with tooth.

Example

Installation of large-format boards, i.e. fixing and positioning, as well as finishing of joints.
As far as fixing is concerned, i.e., the step described as 1, the following element is used:

A) fast-drying single-component adhesive in the form of foamed polyurethane prepolymer (so-called foam), supplied in aerosol cans with compressed gas, e.g. applied by means of a gun, hardened by air humidity, having the consistency of a highly adhesive liquid before curing, and the consistency of rigid polyurethane foam after curing, in the amount of at least 1/3 of a can - onto the surface of a typical 1.2 m x 2.6 m gypsum board, applying the bond in the form of a 2-3 cm 'braid' around the perimeter of the board, i.e., along all of its edges, as well as in a zigzag through the middle.

As far as positioning is concerned, i.e., the step described as 2, the following elements are used:

D) Assembly for positioning gypsum boards

The assembly for setting the position of large-format boards, e.g. gypsum boards, on the top surface of, e.g., a wall or a floor, comprises two basic elements: the fixing-and-separating element (positioner 1) for setting the position of boards on a top surface, e.g. a wall or a floor, a part of which positioner is fixed to the top surface under the board and separates adjacent boards by the thickness of one of the parts. The second part of the assembly is the retaining wedge 2, which is mounted to the catch of the positioner 1 and allows to put adjacent boards on the wall between them at a spacing determined by the thickness of the part of the positioner in such a way that they identically adhere from the outside from the face side, i.e. from the visible side of the surface of the boards after their installation on the top surface, e.g. a wall, floor. Both elements of the assembly are mutually shaped in such a way that the retaining wedge can be engaged on a part of the fixing element - the catch Z formed on the grip C of the fixing-and-separating element (the positioner 1) so that the wedge presses the adjacent boards after they have been put on the top surface. Both parts are made of plastic. A minimum of 2 pieces of the positioning system are used for each side edge of the gypsum board, maintaining a joint of at most 3 mm between the boards. The positioning assembly is described further on (step 2).
As far as finishing of joints is concerned, i.e., the step described as 3 and 4, the following elements are used:

B) Filling mixture for the joining of boards, especially plaster boards, consisting of a mix of mineral ingredients, polymer dispersions, and the latest generation fibres with a fibrillized structure, having the consistency of paste ready for application, used in the amount of at least 0.3 kg per 1 running metre of joint between gypsum boards.
C) single-component sealant based on acrylic resins, designed for the jointing of corners when applying gypsum boards, in the amount of at least 0.045 kg per 1 running meter.

Step 1 Glueing by adhesive the boards - using element A of the example qualitative and quantitative composition.

The single-component composition of the glue being described comprises a mixture of a prepolymer, foaming agents, a surface active agent, a catalyst and, optionally, application additives. The prepolymer is obtained as a result of a reaction of a multi-isocyanate, most commonly a polymeric isocyanate of the MDI type, with a mix of polyols that includes a polyether polyol that is a diol, triol, or a mixture of them, having an average molecular weight within the range of 600-3000 (I), as well as a polyester polyol that is a diol, triol, or mixtures of them, having an average molecular weight within the range of 400-5000 (II), wherein the ratio of the weight parts of polyol (I) to polyol (II) is from 2:5 to 2:1 and the final product comprises free isocyanate groups in an amount of 9-15% by weight. Used as foaming agents are compounds selected from among alkanes, ethers, and their mixtures, in the total amount of 1.5-25 % by weight in relation to the total weight of the composition. Used as surface active agents are reaction products of poly(alkylsiloxane) and alkylene oxides, wherein the alkylene oxides are ethylene oxide, propylene oxide, or their mixtures, in an amount of 0.6-3% by weight in relation to the total weight of the composition. As catalysts, it comprises selected tertiary amines or their mixtures in an amount of 0.3-3% by weight in relation to the total weight of the composition. Used as optional application additives are flame retardants, most commonly based on chlorinated phosphates, as well as colouring agents to give the final product the desired colour.
The spreading rate of the product from a single 1,000 ml can is 10 m2, so using one can a person is able to, e.g.: install 3 full-size gypsum boards with the dimensions of 120 cm x 260 cm x 12.5 mm.
Before bonding - gluing the board to the wall, a piece of gypsum board or another material should be placed at the bottom of the wall as a spacer. Glue should be applied on the board in the form of a 2-3 cm wide 'braid' along the board's perimeter and a 'zigzag' in the middle of the board. Empty space should be left between the braids applied along the edge of the board, to allow air to escape. During application, a distance of 5 cm from the edge of the board (the braid) should be maintained. 'Bead' (warkocz) is a technical term used in technical documentation to describe a section of released foam with a specified thickness and width on a given surface. The diameter of braids may be adjusted to the needs of smoothing out the wall surface. In the case major unevenness, double braids should be applied layer upon layer. Maximum unevenness that can be corrected with foamed glue, i.e., glue with the consistency of foam created by releasing the mixture from a can under pressure onto the surfaces intended to be glued. If the unevenness is larger than 20 mm, additional spacers should be used, e.g. made of elements of gypsum board or other board. Immediately after the glue is applied, the board must be put against the glued surface. After the board has been put against the wall, it should be carefully pressed down and then pre-positioned. Damage to the structure of the glue by strongly pressing or hitting the board should be avoided. After the initial correction, use a set of positioners to adjust the final position of the board by carefully pressing the board against the wall relative to the adjacent board and by tightening the retaining wedge on the positioner. The correction should be made between 2 and 5 minutes after the initial application.

Step 2 - positioning

The assembly for setting the position of large-format boards, e.g. gypsum boards, on the top surface of, e.g., a wall or a floor, comprises two basic elements: the fixing-and-separating element (positioner 1) for setting the position of boards on a top surface, e.g. a wall or a floor, a part of which positioner is fixed to the top surface under the board and separates adjacent boards by the thickness of one of the parts. The second part of the assembly is the setting retaining wedge 2, which is mounted to the catch of the positioner 1 and allows to put adjacent boards on the wall between them at a spacing determined by the thickness of the part of the positioner in such a way that they identically adhere from the outside from the face side, i.e. from the visible side of the surface of the boards after their installation on the top surface, e.g. a wall, floor. Both elements of the assembly are mutually shaped in such a way that the setting retaining wedge 2 can be engaged on a part of the fixing element - the catch Z formed on the grip C of the fixing-and-separating element (the positioner 1) so that the retaining wedge 2 presses the adjacent boards after they have been put on the top surface. Both parts are made of plastic.
The fixing-and-separating elements - means is known as the positioner 1 includes elements such as the base P preferably/optionally in the form of a springy skate-shaped foot - resilient foot, whose one part is applied under the reference board being installed (the first board) on one side, and on the other side under the next adjacent board being installed. From the base P there extends the vertical part of the positioner 1, i.e., the grip C, whose thickness is adapted to the intended spacing between the adjacent boards, and whose height exceeds the thickness of the boards. Formed in the vertical part, i.e., in the grip C, at the base P, there is the narrowing Pr of a thickness narrower than the remaining vertical part of the grip C. The grip C constitutes the vertical part of the positioner.
Formed on the grip C - at the height of the thickness of the board measured from the base P - there is the pressing clip K oriented in the same direction as the part of the base that overlaps - covers the installed board, and the shape of the clip is adapted in such a way that the clip K stably presses the board fixed to the top surface. The pressing clip K has a bevel towards the surface of the board being pressed after it has been fixed to the top surface, thus allowing the installed board to be pressed against the top surface. The clip K allows the installed board to be pressed against the face wall. The grip C allows the positioner to be mounted with the base P under the installed board and then the next board adjacent to it, as well as to mount the retaining wedge 2 on the two boards - the installed one and the adjacent one. As shown in fig. 4, on the bottom surface of the clip K, i.e., towards the pressed surface, there is a tooth-like protrusion facing the pressed surface, the purpose of which is to gently penetrate the pressed surface and to immobilize the positioner in place for the entire time during which it is mounted, preventing it from slipping off or moving when, for example, manoeuvring a board or bringing another board in. The angle of the protrusion to the pressed position is 60 degrees. Dimensions are shown in fig. 4.
On the side opposite to the base P, the grip C widens and ends in the U-shaped flat handle R whose thickness is equal to the vertical part of the grip C but wider, with the wider part of the handle R oriented at 90° in relation to the base P. The edge of the lower wall of the handle has a formed bevel on one side of the edge (at the back, being the catch Z for the retaining wedge 2)
The retaining wedge 2 has a U-shaped or U-like form, a width (spacing of arms) that is adapted to the width of the grip C, and a height that is adapted to the height of the clip K of the positioner 1 and to the thickness of the boards so that the retaining wedge 2 can be engaged on the catch Z of the positioner in such a way that, when engaged, the retaining wedge K presses the adjacent boards to the top surface of, for example, a wall or a floor, after they have been fixed. The boards may be of different thicknesses.
In order to perform the engagement of the retaining wedge 2 to the positioner, on one of the surfaces of the arms of the retaining wedge 2 (looking from the side of the attachment to the catch Z) there is the serration Zo which is a notched surface whose shape is adapted to the shape of the catch Z of the positioner 1; on the edge of the bottom wall of the handle R a bevel is formed, which constitutes the catch Z for the retaining wedge 2. This makes it possible to securely mount and immobilize the retaining wedge 2 to the base of the grip C of the positioner 1. The flexible foot P of the positioner 1 allows boards of different thicknesses to be joined together. The surface of the board is tightened to the flat surface of the wedge, while the foot P bends to compensate for the thickness of the board.
The retaining wedge 2 - is mounted after the boards have been mounted - the installed board - the reference board, and the adjacent board or subsequent adjacent boards.
After fixing the first board (the reference board) to the wall, the positioner 1 is mounted while the glue has not dried yet, so that the board can be moved away from the top surface and the base P of the positioner 1 can be pushed under the board (fixed on the top surface). The clip K of the positioner 1 presses the installed board to the top surface.
After fixing the positioner with the base P on the top surface at a distance equal to the thickness of the positioner's vertical part - the grip C, an adjacent board is added so that it adheres to the other part of the positioner's base P. Then, the retaining wedge 2 is mounted to the catch Z so that it presses the outer surface of the fixed adjacent boards.
After the boards have been installed, the grip C is left in the fitter's hand - it is disposable, and under the boards the springy foot is left, i.e. the base P, which freely falls down to the ground after installing the boards and detaching the fixing element 1 thanks to the narrowing Pr between the base P in the vertical part.
The height range of the vertical part and of the grip C of the fixing element 1 varies from 5 mm to 16 mm, which makes it possible to work with different materials as well as to join boards of different thicknesses.
Installation of boards, e.g. gypsum boards, starts with putting the first board, e.g. gypsum board (the reference board) on the wall. This board is positioned and levelled to the top surface e.g. a wall, floor. After the board has become stable, the positioner 1 is pushed to its edge, by means of the grip C. The base P covers the board to the top surface, and supports the positioner 1. In this way, the assistance of another person is not required.
The base P of the positioner 1 has rounded edges that make it easier to mount the positioner with the base P to the top surface, so that it goes under an already-installed board. The base P does not need to be shaped in any particular way, but it has dimensions (a span) that allows to grab boards with a thickness between 5 and 16 mm. The base P allows to attach the entire positioner 1 to the reference board and subsequent boards because the base P is on the top surface under the boards. The base P allows to attach another board to the positioner 1 already attached to the reference board.
The next board is pushed to the edge of the grip C of the positioner 1 already mounted so that this next board (adjacent board) closely adheres to the grip C of the fixing-and-separating element 1 . The thickness of the vertical part - the grip C - of the positioner 1 is, e.g., 2 mm, i.e., the minimum required spacing between the boards.
The next step is to slide the wedge 2 onto the vertical part of the fixing element - the grip C - so that both arms of the retaining wedge 2 encompass the grip C thus securing the retaining wedge 2 to the catch Z. Thanks to the bevel of the catch Z of the positioner 1, the retaining wedge 2 will get locked on the positioner 1 at the place suitable for the thickness of the board being positioned. The sliding of the retaining wedge 2 to the catch Z causes the board to get positioned (pushed out or in) and results in alignment of the surfaces of the adjacent boards, the reference board to the next board, the first board to the next board, etc.
The joint between the boards becomes rigid enough for two more boards to be placed - laid without waiting for the glue to fully bond. After the glue has bonded, the fitter pulls the grip C and tears off the positioner - the tearing off is possible thanks to the narrowing Pr of the positioner 1 located at the springy foot, which remains under the boards and freely falls out of the gap and down to the floor. The grip C of the positioner 1 gets torn off, while the retaining wedge 2 falls out and can be reused for subsequent installation work. The springy foot of the positioner 1 falls freely from the gap between the boards and, consequently, the required 2 mm gap is maintained.
Step 3. Filling with element B - ready-to-use filling mass, which comprises:

A) mixture of acrylic copolymers with a glass-transition temperature from -10 °C to 25 °C ranging from 1 to 40% by weight
B) composition of wetting agents ranging from 0.001 to 5% by weight
C) composition of emulsifiers ranging from 0.001 to 5% by weight
D) rheology-modifying agents ranging from 0.001 to 5% by weight
E) fillers selected from among groups of carbonates, silicates, and diatomites, ranging from 5% to 70% by weight
F) shrinkage-preventing fibres ranging from 0.001 to 5% by weight
G) water ranging from 5 to 30% by weight

The spreading rate and consumption of the product is determined at 300g of product filling a joint of 1 running metre, assuming a gap width of 2-3 mm along the entire length of the joint.
Approximately 30 minutes after application, the working of the board can begin, i.e., filling and jointing, whereas in the next (and last) step 4 - the working of vertical and horizontal joints between boards.
Before jointing, the surfaces of the boards' joints must be properly prepared. The boards should be stably fixed to the supporting structure, dry, free of dust and other contamination. Any sharp edges should be chamfered, dusted off, and primed. The joining of boards and the filling of joints should be done with a spatula, applying the mass deep into the joint and smoothing out the external surface of the joint. After bonding, any minor unevenness should be removed. After drying, polishing should be performed - manually or mechanically with a mesh sanding sheet or sand paper. Work should be carried out with clean tools to prevent lumps or holes in the surface.
Step 4 - horizontal and vertical corners between the walls, ceiling, and floor using the element C described in detail in the example at the beginning, which comprises:

A) mixture of acrylic copolymers with a glass-transition temperature from -10 °C to 25 °C ranging from 1 to 40% by weight
B) composition of dispersing agents ranging from 0.001 to 5% by weight
C) composition of emulsifiers ranging from 0.001 to 5% by weight
D) rheology-modifying agents ranging from 0.001 to 5% by weight
E) fillers selected from among groups of: carbonates, silicates, and diatomites, ranging from 5% to 70% by weight
F) titanium white up to 0.9%
G) plasticizing agents ranging from 1 to 5% by weight
H) water of up to 2% by weight

The spreading rate of one 280 ml cartridge of acrylic is determined to be approx. 11 running metres, assuming a joint depth and width of about 5 mm.
The surfaces being joined should be smoothed out and thoroughly cleaned (dust, rust, residues of old sealant or paint, grease and oil, and other contaminants removed). The surface should be degreased with acetone or ethanol (glass, glaze, metals) or detergent (plastics). The sealant should be applied using mechanical or pneumatic squeezers from 280 ml cartridges. The cartridge outlet should be cut off above the thread and the application tip should be cut at a proper angle to the joint's width and screwed onto the outlet. The gap should be thoroughly filled to ensure continuous adhesion of the sealant to the surface being sealed, and painter's tape should be used (and then removed immediately after finishing the working of the silicone) to prevent contamination of the joint vicinity and to maintain a straight line. The joints should be smoothed out with a silicone spreading tool, spatula, finger, or rag dipped in water to reduce adhesion. Any excess unhardened sealant should be removed from hands, tools, and soiled surfaces with water or soapy water. After hardening, sealant should be removed from hands with soap and water and from tools - by mechanical means.
Advantages of using the solution in the systemic assembly:

The polyurethane base of the foamed ahesive gives the possibility of gluing without the use of water or electricity, which is required by traditional gypsum-based adhesive;
Possibility of levelling and correcting the vertical position of the board by means of gentle pressing;
Easier installation of large-size boards;
Thanks to the rapid hardening of foamed adhesive, boards can be positioned and levelled in relation to each other using the developed positioning assembly;
Also, thanks to the other chemical components, boards as well as the vertical and horizontal joints between them can be worked quickly ;
Tremendous time savings compared to traditional solutions;
Wide range of applications - for gypsum boards as well as gypsum-cement boards, OSB boards, wood-based boards, and magnesium boards.

Claims

Assembly for positioning large-format boards on a top surface, the assembly comprises means for fixing-and-separating (1) for positioning a board on top surface and setting the gap between an adjacent board, and additionally comprises retaining wedge (2) that is mounted to the means for fixing and separating (1) enabling adjacent boards to be evenly placed on the top surface at such a distance in relation to each other determined by the thickness of the means for fixing-and-separating (1), wherein the means for fixing-and-separating (1) comprise a base (P) formed as resilient foot, which is adapted to be placed under the adjacent boards wherein a grip (C) extends from the base (P) at an angle of 90° whose thickness is adapted to the intended gap between the adjacent boards, wherein within the grip (C) a narrowing (Pr) is formed close to the base, wherein the means for fixing-and-separating (1) and the retaining wedge (2) are mutually shaped so that the retaining wedge (2) is adapted to hitch a catch (Z) that is formed on the means for fixing-and-separating (1) so that the retaining wedge (2) presses the adjacent boards to the base (P) after adjacent board have been placed on the top surface and wherein the catch (Z) for the retaining wedge (2) is formed on the grip (C) in the opposite direction with regard to the base (P), wherein the retaining wedge (2) is shaped making adapted to hitch the catch (Z) in such a way that, after engaging the catch (Z), the retaining wedge (2) presses the adjacent boards to the base (P) surface, characterized in that on the grip (C) a pressing clip (K) is formed, wherein the shape of the clip (K) is adapted so as to stably press the upper surface of the board that is fixed to the top surface.
The assembly according to claim 1, wherein the retaining wedge (2) is U-shaped or U-like in shape, and on one of the surfaces of its arms, on the side of the fixing to the catch (Z) a serration (Zo) is formed, which is shaped so as to match the shape of the catch (Z).
The assembly according to claim 1, wherein in the opposite direction to the base (P), the grip (C) widens into an end that is a U-shaped flat handle (R) of the grip (C) with a thickness equal to the thickness of the grip (C), whereas the edge of the lower wall of the handle (R) bevel formed on one side of the edge which constitutes the catch (Z) for the retaining wedge (2).
The assembly according to claim 2, wherein the shape of the catch (Z) is determined to the serration (Zo) so that the retaining wedge (2) is adapted to be hitched to the catch (Z).
The assembly according to claim 1, wherein the height of the grip (C) is between 5 mm and 16 mm.
The assembly according to claim 1, wherein the size of base (P) has a span that enables place boards with a thickness of 5 to 16 mm.
The assembly according to claims 1-6, wherein the pressing clip (K) towards the pressed surface of the clip, there is a protrusion towards the pressed surface, wherein the angle of the protrusion to the pressed position is between 55 and 65 degrees.
Method for setting the position of large-format boards on a top surface, which method consists in fixing adjacent boards at a predetermined spacing, characterized in that the method is performed with use of the assembly described in any of the claims 1-7 wherein installation of boards starts with putting the first board that is the reference board on the top surface using known methods, then the means for means fixing-and-separating (1) is located to the board's edge using the grip (C) in a matter that the base (P) of means for fixing-and-separating (1) overlaps the adjacent boards, then the adjacent board to the before one is located to the edge of the grip (C) and the retaining wedge (2) is hitched to the catch (Z) in order to position the adjacent boards in relation to the top surface, and then, preferably in the same manner, other boards are fixed, and after the boards have been fixed, the grip (C) is pulled to detach it using the narrowing (Pr).
A system for installing large-format boards on a top surface, characterized in that it comprises the assembly described in claims 1-7 and the system for fixing large-format boards on a top surface comprising:
A) single-component adhesive made of a foaming prepolymer, having the consistency of a highly adhesive liquid before curing, and the consistency of rigid foam after curing, which comprises a composition of polyester resins, modifiers, and polymeric isocyanate;

B) mineral-and-acrylic mixture that comprises a polymer dispersion as well as fibres with a fibrillized structure, of paste consistency, based on an acrylic dispersion with a low volatile organic compounds content, adapted for creating low-emissions building-industry chemicals, wherein calcium carbonate and/or silicon are used as mineral fillers;

C) acrylic mixture for sealing, which comprises known acrylic resins, designed for the jointing of corners when building with gypsum boards.