What is the ideal thickness for a plasterboard partition?


For your construction or renovation work, you may need to erect a plasterboard partition. In this case, it may be interesting to know the dimensions, in particular the ideal thickness. If there are standard sizes, it is also possible to opt for a custom-made partition. Let’s take stock of the thicknesses of the plasterboard partitions.

What is a plasterboard partition made of?

A plasterboard partition consists of two essential elements and optional elements. The standard thickness of a drywall wall is determined by the thickness of two drywall sheets and the rail that holds them in place.

In addition, the thickness of a plasterboard partition depends on the insulation put in place between the two plasterboard sheets, and, of course, on the type of coating that is affixed to it for aesthetics.

Note that the standard thickness of a plasterboard sheet is related to its properties. There are indeed several types of plasterboard sheets to cover several uses. The classic plates, the BA13, are used to make traditional partitions. They are thermal and sound insulating, but also flame retardant. There are also water-repellent plates known for their water resistance, fireproof plates which resist fire, soundproof plates which isolate more noise or even ceiling plates.

What are the different thicknesses of plasterboard partitions?

Calculating the thickness of a standard plasterboard wall is simple. Just count the thickness of two BA13 plasterboards, which measure 13mm and the rail, which measures 48mm. As a result, a conventional partition is 74mm thick. This standard thickness is sufficient for the realization of simple partitions within the house. These partitions are suitable for classic partitions between rooms without particularities (living room, bedrooms, etc.) or spaces to be distinguished (partition or half-partition).

For parts that require specific insulation (against fire, against water and humidity, against noise, against temperature variations, etc.), the addition of insulating components varies the thickness of the plate from 10 to 25 mm. The rail then moves between 36 and 120 mm.

Here are the elements that can vary the ideal thickness of your plasterboard partition according to your needs.

  • Insulation : a plasterboard plate is too thin to really insulate a room. It also contains no insulating property. You will therefore need to add insulation according to your needs and plan its thickness. A thermal and sound insulation can be 4 to 10 mm thick depending on the model chosen. Add this thickness to that of the two BA13 plates and the rail.
  • BA6 plate : this plasterboard is the thinnest and measures only 6 mm. It is only decorative for making simple partitions or false ceilings.
  • BA10 plate : with its 10 mm thickness, it is thicker than the BA6 and a little more solid.
  • BA15 plate : this specific plate is designed to resist fire. Ideal for kitchens or the backs of stoves or fireplaces, they also limit the diffusion of odors.

As you can see, it is difficult to define the ideal thickness of your drywall partitions. It all depends on your need.

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