In addition to choosing the right finish, the silence will help sound insulation internal doors. We tell how to choose them.
Standard interior doors have an air noise insulation index (RW) 18-27 dB, depending on the design of the web and the box. For bedrooms and cabinets it is desirable to choose models with improved sound insulation properties that are not heard of the speech (RW ≈ 25 dB). We will start a conversation with them, and then tell about special "super thunder" door blocks intended for home theaters and musical studios.
1 What makes noise insulation doors?
The soundproofing ability of the interior door is made up of a variety of elements related to both the design of the web and the box and to the installation method.Filling the web
Representatives of large factories and trading houses usually do not hide information about the device of the canvas. The best from the point of view of sound insulation is products with a continuous filling from the cross-knife bars. Excellent indicators have canvas from full-scale extrusion chipboard, but they are getting too hard. Most often a chipboard with round voids, but the most common filling is cardboard cells; The maximum RW value of these structures is 25 dB. Doors filled with polystyrene foam or polyurethane foam, as a rule, poorly isolate air noise - their RW does not exceed 18 dB.
High sound insulation requirements are presented to the doors of all rooms, including living rooms and kitchens. The larger the obstacles for sound, the easier it is to achieve silence in private rest - bedrooms and cabinets
Sheaving
The thickness and density of the casing layers is especially important if the web is filled with cellular material. In the production of many budgetary doors, too thin (4-5 mm) MDF is used, meanwhile, the minimum permissible thickness of the skin is 6 mm. It is even better if instead of MDF uses more solid HDF plates or a 6-8 mm thick chipboard. The method and material of the finishing of the serial belt (veneer veneer, lamination, color) on sound insulation properties practically does not affect.Seals
The contour of the seal on the box is a mandatory door detail with improved sound insulation properties. The tubular seals made of soft reinforced plastics have proven perfectly. Thin rubber gaskets are no less effective, but require perfectly accurately adjusting the loops and the castle, that is, the workshop of installation. Fitting. This is called the protrusion on the edges of the canvas, which, when closing the door, does not betented in the box, and the folding is pressed. By itself, this element practically does not affect sound insulation, but allows you to install an additional seal contour and thereby boost RW for 2-4 dB.
Models with hidden (embedded in the wall) Soundproofing box exceed ordinary for 1-2 dB, as more sealed
2 What is the difference between special sound insulation doors?
Special soundproofing doors (they are also called acoustic) produce the Krasnodirevik company, "Stavr", "MGK-Group", "TRIER", etc. In addition, such structures can be ordered in firms engaged in home theaters and studios. The price of serial products is 12-22 thousand rubles., Customs stands at least 2 times more expensive. The canvas of the acoustic door is always the thickness of 45 mm and is filled with an effective noise-absorbing material, such as a soft wood-fibrous plate (wooden bars serve as ribs). Another option is a multilayer design of two or three lung chipboard with a thickness of 10-20 mm, between which the sheets of a cork agglomerate with a thickness of 4-6 mm are laid. Both options allow you to increase RW doors up to 30-35 dB, but only provided that an additional "upgrade" of the door block will be held.
In some firms, when buying a soundproofing door, you can order wall panels and furnishing elements made in the same style
To achieve maximum sound insulation, it is required to establish the second, and sometimes the third seal contour (the so-called labyrinth floor), but the main thing is to eliminate the clearance under the web. Since the wooden protruding threshold is inconvenient and even dangerous, today the door is more often equipped with a retractable thoring-curtain, which is embedded in a canvas or fasten the bed.
The inner surface of the acoustic door should not reflect so much how much to disperse and absorb the sound wave - to extinguish the echo. Therefore, the acoustic doors, as a rule, are squeezed with special materials, such as embossed wooden panels, or tested with cloth (skin), under which the synthetic batting layer is placed.
The so-called traditional doors consisting of a frame and one large insertion are usually inferior on sound insulation by shield models, since their average thickness is 10-20 mm less
3 How to assemble the door for better sound insulation?
As a rule, the installation of doors is charged with representatives of the trading company. At the same time, many products require fitting and refinement on the spot: masters have to be styled at an angle of 45 ° bars of the box, choose the grooves under the lock and loops. Errors at this stage entail a sharp deterioration in sound insulation. First of all, the battle of the box is unacceptable. In this case, the canvas does not adjoin the seals, and the sound easily overcomes the barrier through the left slot. Errors In determining the size of the upper jumper lead to an increase in the gap between the edges of the canvas and the box bars (its optimal value is 2-3 mm), which also negatively affects sound insulation.
The fillety door will be good to isolate the sound if the fillets are equal to the frame, and the relief drawing is created using a baguette
Another common oversight is too much clearance under the canvas (excess height of the box racks). The installers fear that the door will touch and scratch the floor covering and leave the remuneration of the width to 1 cm below. This leads to a deterioration in sound insulation by 5-7 dB. Ideally, the magnitude of the gap under the canvas should be 3 mm, but for this it is necessary that the floor is perfectly even, the design of the door block excluded the seamless savings, and besides - so that shrinkage processes ended in the house.
The mounted gap is usually filled with polyurethane foam. This material has a not very high sound absorption coefficient (α), but it allows you to clearly seal the gap. For a narrow seam (less than 6 mm), silicone sealant or "liquid nails" are suitable, although the viscous glue is more difficult to fill the slot to the entire depth. But the replete solutions are unreliable - they crack and chosen.
The accuracy of the sampling of the counter hole is essential to the door latch tongue. It is necessary to provide a soft but tight clamp of the canvas to the box - the backlash is not allowed, while the door should be easily closed.
4 What are the factors to pay attention to when choosing?
- Large (more than 37 mm) thickness and proper geometry of the canvas.
- Filling the web with solid plates or its covering with solid materials with a thickness of 6 mm.
- The absence of fillee is less than 20 mm thick and glazing with a thickness of less than 8 mm.
- The presence of the seal contour on the box (ideally - the premium and an additional sealing canvas).
- Proper adjustment of the door lock, at which the closed sash is well pressed to the box.
- Minimum clearance under the web (no more than 5 mm) or retractable threshold.