Preparation in this situation involves the following actions:

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Therefore, it is not only necessary, but also advisable to install vapor barrier and insulation.

How to Properly Make a Vapor Barrier Under Drywall
Drywall should be installed only after special preparation. Without preparatory work, you are unlikely to get at the end of the renovation what you expected at the very beginning. In addition, the vapor barrier may be installed incorrectly, which will not allow you to enjoy its benefits.


cleaning walls and ceilings from old finishes;
clearing the premises of construction waste so that it does not get underfoot during work;
Next, you should fill all the cracks with putty so that they do not crumble and do not interfere with the work;
we treat the walls with a deep penetration primer;
After the primer has dried, apply an antiseptic to the walls. It will fusion data mold and mildew from appearing.
Please note! Treatment with antiseptic agents before vapor barrier is mandatory, since mold or fungus spores getting behind the film can lead to their reproduction inside the room.

Also at this stage, you can draw up a diagram for the frame and apply markings to the prepared surface. This will make installation work much more convenient.

Tools and materials for installing vapor barrier under plasterboard
Installing a vapor barrier on drywall will require the following tools:

hammer drill and drill;
building level;
drawing supplies – pencil, tape measure and ruler;
hammer;
sandpaper;
spatula.
In addition to the tools, you will also need the following materials: