What is meant by double decoupling

Single vs. double planking in drywall

[Vsevolod Chuvanov] © 123rf.com


Every DIY drywall builder has already pondered the question of whether he should plank the planned new wall once or twice, i.e. whether one or two layers of drywall should be attached. Aside from the cost and time savings, there are other important factors that play a role in this decision. The blog article gives some hints as to which these are and based on which criteria you should choose one or the other variant.


Do you generally prefer simple planking?


The decision for or against the double planking of a drywall is often made very easily. Especially when you are in Self-directed builds, the simple planking seems to be less time-consuming and quicker to implement. Because only one layer of drywall is screwed onto the stud frame, which forms the basis of the wall to be built. But double planking with two layers of plasterboard also offers many advantages.

So you should even if the interior works on a Drywall company outsourced will discuss with the contractual partner exactly whether single or double planking is best suited for the project and the final living situation.


Decision factors for single and double cladding


The DIN standard 4109 specifies the guidelines for noise protection in the area of ​​residential construction in Germany. It is valid under building law in all federal states. Since the type of cladding of drywall affects the transmission of sound to a certain extent, these guidelines are also relevant when deciding on the type of cladding.

In addition, also have the VDI (Association of German Engineers) and the DEGA (German Society for Acoustics) made specifications for sound insulation in building construction.

For sound insulation, however, not only the drywall that may have to be erected in the interior, but also also sources of external noise. These are included in the possible sources of noise. If a room with a pleasant and quiet atmosphere is to be built, any noise from outside must also be taken into account and appropriate noise-reducing measures must be taken.

The general rule: the heavier a building material, the less sound can penetrate. In this respect, double planking is required if increased noise protection is to be guaranteed. The latter can also be achieved by other measures, such as decoupling on the floor, wall and front sides of the new wall as well as by facing shells or soundproofing porches with appropriate sound insulation wool.


Fire protection and the single or double planking


The fire protection guidelines are also in one at the federal level DIN standard 4102-1 laid down. In general, a larger number of panels or a thicker layer enables a higher level of fire protection.

In the plasterboard is namely also Water includedwhich initially evaporates in a fire, making it difficult to spread. Gypsum boards are initially considered to be "non-flammable" according to the Building material class A2. There are also special ones for optimal fire protection Fire protection panelswhich in turn are then screwed on twice.


Effects of single or double planking on the load-bearing capacity


The type of planking mainly makes a difference in terms of the weight that walls can support. Simply planked drywall can usually withstand light objects such as pictures and small or light shelves. In the case of walls that are only erected to separate the living space, simple planking is therefore conceivable. As Rule of thumb can be said to be items to be attached to the wall from 40kg weight per meter of wall length require double planking. This value applies to panels of 12.5 mm Thickness. The loads that drywall cannot withstand include Washstands, toilets that are mounted hanging, or constructions that protrude far from the wall but have no contact with the floor.

Also Tiles are better held by a double planking. Because if simply planked walls are tiled, the panels bend too much under their weight. Exceptions are small tiled areas where the weight of the tiles has no noticeable influence on the wall.

Filling plasterboard

In the case of building projects in the bathroom is also on the use impregnated drywall to ensure that no moisture can pass through. These are mostly turquoise or green. Another aspect for the load capacity is the height of the wall. Will walls above the standard size of 250 cm built, double planking should also be used.


Tip: Read processing guidelines for plasterboard


A reliable source for questions about the plasterboard to use in your own construction project is provided by Guidelines of the plasterboard manufacturers. Here the basic rules for processing the panels on the wall are described and spelled out for different cases.


Which must be observed depending on the type of planking


Whether you have single or double planking, there are different things to consider, which result from the wall properties. The following should be observed during processing in order to achieve optimal results with both variants.

With simple planking:
  • Cross joints should be avoided when laying
  • The front edge should be offset by 40 cm
  • Length of the drywall screws for wooden posts: 35 mm
  • Length of the drywall screws for metal posts: 25 mm
With double planking:
  • The standard distances in the stud frame should be 30 or 60 cm
  • The first layer of the planking should also be filled.
  • Length of the drywall screws for wooden posts: 45 mm
  • Length of the drywall screws for metal posts: 55 mm

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Advantages and disadvantages of single vs. double planking


The following picture emerges when considering all the factors on the subject of planking: It is clearly in favor of double planking, but is also crucially dependent on the later use and the associated demands on the wall.

Advantages of simple planking
  • Less time and effort in construction
  • Lower costs
Advantages of double cladding
  • Holds more weight with suspended elements
  • Higher noise and fire protection
  • Allows a more versatile use of the built wall overall


Single paneling is certainly quite popular in interior design. However, it is accompanied by some disadvantages, such as the lower sound and fire protection compared to double planking and the lower load capacity of the wall. If these factors are irrelevant for planning reasons, it is legitimate to opt for simple planking due to the time and cost savings.

In contrast, double planking offers a number of advantages that should not be underestimated. If peace and fire protection are particularly important to you, you should opt for double planking here as well. Who in the future may have a Change of use or conversion planning his wall should also think about the double layer of plasterboard. Because they ultimately make walls more versatile. Whether single or double: in any case, the drywall panels are filled and finally sanded flat with a drywall sander and suitable sandpaper.