Dry screed with increased sound insulation. Dry floor Knauf - soundproofing layer

Of course, you know from publications on this forum about negative impact for additional and basic sound insulation for both impact and airborne noise. designs of foam gaskets, provided they are in close contact with surfaces.
According to test results, only a screed weighing more than 140 kg is acceptable for reducing impact noise. special type foam plastic (with a small(!) dynamic modulus of elasticity.)
In all other cases, from the point of view of sound insulation, polystyrene foam is either very harmful (Gesele effect - rigid connection and high natural frequency of structures) or useless.

This was a quote from the Knauf website. I have no doubt that they know this too.
That's why I clarified how to understand it.
But since the owner does not plan to add 3 cm, this option is removed.

Undoubtedly - an increase in the mass of one more GVL sheet to two floor elements of KNAUF GVL sheets - will improve according to the laws of acoustics impact noise reduction indicators. At the same time, it is difficult to imagine how Akuflex will effectively perform its functions without damage and with heterogeneity ( instability) base on a PREFABRICATED (!) surface from just one (!) sheet of gypsum plasterboard..- Here in it TYPICAL application-on a LEVELED and HOMOGENEOUS surface of a pouring screed under a 100-140 kg concrete screed. Or even on a FLAT, HOMOGENEOUS surface under laminate parquet (tests from the AcousticGroup website...)

What other options are there? Knauf offers exactly the option: 1 sheet of gypsum fiber board - soundproofing gasket - two sheets of gypsum fiber board. Only they have a different gasket.
The issue of efficiency worries me very much: I don’t see the point in doing something that will give an increase of 0.5-1 dB.

In addition, there is a bad assumption that for strength, your upstairs neighbor will fasten ALL layers of the floor with self-tapping screws. In this case, the role of Akuflex will not justify its money.

I hope to avoid this - I will definitely remind the masters about this several times.

Let me remind you that even in KNAUF’s schemes it is not just “expanded clay” that is used, but rather expanded clay sand - read the composition of their (KNAUF) “backfill” and its density.
Only when using this, it’s more likely “coarse expanded clay sand” ( crushed(!) expanded clay - them with the same Knauf name) - and the indicators that are given in Beta and Gamma are achieved. - The criterion of the THICKNESS of the elastic gasket, albeit with a rather large dynamic modulus of elasticity. (According to the table of SNIP 1977) (By the way, a similar design, but with much more massive - with a 60-kg screed - is given in one of the tables 12-14 of SNIP 1977 "permitted" floors allowed in apartment buildings - with crushed slag or sand)
What I mean is that I hope that the craftsmen you mentioned do not mean “expanded clay “SPILLED” with cement” that has nothing to do with sound insulation, or, especially, expanded clay concrete under a gypsum plaster board). If the craftsmen showed you a test report or a clipping from a manual on noise control or sound insulation for technical universities... Unfortunately, the myth about the supposed soundproofing properties of expanded clay concrete, like the myths about polystyrene foam (foamed polystyrene), lives among some builders (arising from the identification processes of HEAT and SOUND insulation (sound absorption), which have completely different natures...)..

No, we're talking about specifically about expanded clay without concrete.
And even compact - expanded clay with a fraction size of 1-5 mm.

Improved sound insulation. Dry screed with increased sound insulation, made using a honeycomb layer of cardboard. It resembles a honeycomb and is placed on the base. After filling the honeycomb layer with a special backfill, the insulated dry screed floor elements are laid. But first things first.

Dry screed with increased sound insulation - preparation of the base floor

Any floor, on any floor, in any building can be used as a base floor. The base floor should not have any slopes and should have minimal unevenness when checked for clearance.

• The wooden base floor must be firmly fixed, not creaking or “walking” underfoot.

• The concrete floor and floor screed must not have holes, chips or cracks. The concrete floor must be covered with polyethylene 200 microns thick with an overlap of 100 mm.

Floor insulation and edge tape

A sound-absorbing insulator is laid on the base floor. A honeycomb cardboard layer is placed on the insulator. The interlayer sheets are placed end to end.

Backfill

Backfilling is done directly from the bag. The backfill is poured into the honeycombs until they are completely filled.

After backfilling, an edge strip is laid around the perimeter of the room, forming a damper between the dry screed and the wall. As an edge, you can use strips of any thin (1-2 cm), insulating material. The edge tape must be secured to the wall with staples or tape.

Laying subfloor sheets

Some companies produce dry screed floor elements with glued insulation. If you do not find such floor elements, then independently lay insulation on the backfill in the honeycombs and lay paired sheets of GVLV on top of it ( gypsum fiber sheets moisture resistant). You can also take ready-made Knauf-supefloor elements and glue felt insulation to them.

• Laying the base sheets begins in the far right corner of the room. Sometimes, installation has to be done from the left corner, moving not to the left, but to the right.
• The rows of sheets are shifted so that the short seams of different rows do not coincide, but are staggered.

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• At the first row of slabs, the lock on the wall side is cut off. The same technology is used when laying laminate and parquet boards.

• The locks are coated with a special mastic. In addition to mastic, the locks are tightened with 4x19 mm screws. The distance between screws should not exceed 400 mm.

, seal the seams as desired. Of course, it's better to close it up. After puttying the seams, do not forget to clean them and remove dust with a primer.

That's all! The dry screed with increased sound insulation is ready. Walk on a level floor.

Living in big city, we are constantly faced with a problem whose name is noise. What kind of phenomenon is this? Let's look in the dictionary. In short and simply, noise is sounds that merge into something unclear, discordant and perceived by a person as a nuisance and, accordingly, adversely affecting his body and interfering with his work and rest.

Noise is divided into 2 types

1. Airborne, when sounds are transmitted through the air - talking, coughing, laughing or crying. Airborne noise is the strongest psychogenic factor, that is, it irritates us the most.
2. Shock - the result of sudden shocks and falls of heavy objects. We react to it more calmly.

It is impossible to get rid of noise, but you can reduce the impact of extraneous sounds on the nervous system.

Knauf specialists took a responsible approach to solving the problem of sound insulation and developed system solutions, which included gypsum fiber Knauf supersheet (GVL). IN in capable hands master, he will make your home quiet and cozy, where you will always be happy to return.

What is a KNAUF superlist?

Gypsum fiber KNAUF supersheet is made by pressing gypsum and fibers of fluffed waste paper, which are evenly distributed throughout the entire volume of the sheet. Thanks to high density he has increased soundproofing characteristics, and is also impact resistant.

Among other things, KNAUF gypsum-fiber supersheet is recommended for finishing rooms with high requirements in terms of safety, as it has high fire-technical characteristics. This material is often lined with wooden surfaces to provide them additional protection from fire. The front and back sides of the KNAUF gypsum-fiber supersheet are coated with an effective water repellent. sanded and treated with anti-chalking impregnation.

On a note

When mounted directly on a wall or ceiling of frames that experience impact noise loads, metal guides can become a conductor of vibrations, transferring impact noise to the gypsum fiber cladding. But if you follow technology and German quality standards, then it is necessary to separate the metal frame from adjacent building structures. For this purpose they use sealing tape KNAUF-Dichtungsband.

Solving the Noise Problem

It should be understood that effective sound insulation is always a design, and not a separate material.

Ceiling design

• (1) KNAUF supersheet (GVL, GVLV) 10mm – 1.0 m 2
• (2) KNAUF profile PP 60/27 – 2.9 linear. m
• (3) KNAUF profile PN 28/27 – * linear. m
• (4) Profile extension 60/27 – 0.2 pcs.
• (5) Single-level connector 60/27 – 1.7 pcs.
• (6a) Straight suspension – 0.7 pcs.
• (66) Self-tapping screw LN9 – 1.4 pcs.

or in return

• (6c) Suspension with clamp – 0.7 pcs.
• (6g) Suspension rod – 0.7 pcs.
• (7) Screw MN 30 – 23.0 pcs.
• (8) Anchor element – ​​0.7 pcs.
• (9) Dowel K 6/35 – ** pcs.
• (10) Reinforcing tape – 1.2 linear. m
• (11) KNAUF-Fugen GV putty – 0.4 kg
• (12) KNAUF-Tiefengrund primer – 0.1 l

One of the options for soundproofing design equipment suspended ceiling is the complete KNAUF P 213 system. It represents full set specially selected materials necessary to create a suspended ceiling from KNAUF supersheets on a single level metal frame, which is mounted from a ceiling profile.

The main profiles are suspended from load-bearing structures ceilings using adjustable hangers. The supporting profiles on which the KNAUF supersheet is attached are located in the same plane as the main ones.

If the neighbors above are actively rattling and stomping, then between the rough ceiling and the suspended ceiling you need to place soundproofing material- mineral wool. And to protect against impact noise it is better to use special vibration suspensions.

Cladding design

• (1) KNAUF supersheet (GVL, GVLV) 12.5 mm – 1.0 / 2.0 m2
• (2) KNAUF profile PP 60/27 – 2.0 / 2.0 linear. m
• (3) KNAUF profile PN 28/27 – 0.7 / 0.7 pcs.
• (4) Straight hanger 60/27 – 0.7 / 0.7 pcs.
• (5) Sealing tape – 0.8 / 0.8 pcs.
• (6) Dowel K 6/35 – 1.6 / 1.6 pcs.
• (7) Screw LN 9 – 1.5 / 1.5 pcs.
• (8a) Screw MN 30 – 14 / 6 (7) pcs.
• (8b) Screw MN 45 – 14 pcs.
• (9) Knauf PU profile - according to customer needs
• (10) Profile extension 60/27 – according to customer needs
• (11) Reinforcing tape – 0.75 / 0.75 linear. m
• (12) KNAUF-Fugen putty – 0.3 / 0.5 kg
• (13) KNAUF-Tiefengrund primer – 0.1 / 0.1 l
• (14) Mineral wool board – 1.0 / 1.0 m 2 (according to customer needs)

For soundproofing walls, KNAUF experts recommend using complete system C 663. The fact of using mineral wool in the frame space guarantees a significant increase in the sound insulation index of the structure. And if you increase the number of sheets in the cladding (on a frame with mineral wool inside), then this design will significantly reduce airborne noise. When using vibration suspensions, the gypsum fiber lining will also protect from impact noise.

Partition design

• (1) KNAUF supersheet (GVL, GVLV) 12.5 mm – 4.0 m 2
• (2) KNAUF profile PN 50/40 (75/40, 100/40) – 0.7 linear. m
• (3) KNAUF profile PS 50/50 (75/50, 100/50) – 2.0 linear. m
• (4a) Screw MN 30 – 13 pcs.
• (46) Screw MN 45 – 29 pcs.
• (5) KNAUF-Fugen GV putty – 1.0 kg
• (6) Reinforcing tape – 1.5 linear. m
• (7) Dowel K 6/35 – 1.6 pcs.
• (8) Sealing tape – 1.2 linear. m
• (9) KNAUF-Tiefengrund primer – 0.2 l
• (10) Mineral wool board – 1.0 m2
• (11) Knauf PU profile - according to customer needs.

An excellent solution for soundproofing rooms is the C 362 partition with two-layer cladding made of KNDUF supersheets on a single metal frame.

If a single-layer gypsum fiber board partition filled with mineral wool will reduce the noise level to 52 dB, then a two-layer partition will reduce the noise level to 60 dB! Knauf supersheet not only reduces decibels, its structure and density make it possible to cut off noise of all types and different frequency ranges. This means that mid- and high-frequency voices of people, music, and TV sounds will not disturb anyone.

Installation KNAUF claddings must begin during finishing works(V winter time when heating is connected), when all “wet” processes are completed and the wiring of electrical, ventilation and plumbing systems is completed. In this case, the room temperature should not be lower than +10*C. Before installing the cladding, gypsum fiber sheets must undergo mandatory acclimatization (adaptation) in the room.

Floor design

Sound waves do not encounter any obstacles on their way up, so soundproofing the floor is a necessity. However, if a certain amount of sound waves are scattered when transmitted through air, then in the case of impact noise, the floor slab directly radiates noise into the room below. In addition, the sound wave is transmitted from the ceiling to all adjacent wall structures. There is also a solution from the KNAUF company: dry screed using KNAUF-superfloor technology.

The first layer of such a floor will be polyethylene film with edge tape along the entire perimeter, then - KNAUF expanded clay backfill in a layer of 20 to 90 millimeters. The backfill simultaneously absorbs sound vibrations and levels the floor surface. From above, the structure is covered with floor elements (FP) made of gypsum fiber (OP 131 system). The material, due to its density (1,150 kg/m3), provides reliable sound insulation.