ᐅ Construction of a Drywall Partition with Existing Wooden Studs

Hello everyone,

I would like to install a drywall partition in the attic.

As part of the roof structure, or to transfer forces from the roof frame, four KVH posts measuring 10x10 cm (4x4 inches) have been placed on the unfinished floor (with a beam resting vertically on top). This already forms part of the stud frame.

Good sound insulation between the rooms is important to me. Additionally, I would like the drywall to align flush on one side with the already plastered sand-lime brick wall. According to caliper measurements, that is 21 mm (approximately 0.8 inches).

Based on these parameters, this is the construction I have come up with so far. I am planning to fill the cavity with SteicoFlex wood fiber insulation—are there any better recommendations?

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Between the 10x10 cm (4x4 inch) posts, I would add more timber studs and secure them to the existing upper cross beam with brackets. From what I have read here in the forum regarding sound insulation, it is advisable to install a stud frame on the unfinished floor, correct? Will I then need a horizontal (decoupled) timber beam on the unfinished floor between the 10x10 cm (4x4 inch) posts? Usually, when building on a greenfield site, this seems to be standard practice, right? There is already a screed layer in place, but the screed installer made a separation cut between the rooms. If necessary, I would remove the screed as well. Underneath the screed, there are a few centimeters of insulation.

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I would greatly appreciate any tips.

Best regards

The manufacturers’ websites for gypsum boards provide technical information on single and double layering, board thicknesses, white, green, and blue boards, as well as the corresponding sound insulation values. Just have a look.

All right.
Could you also provide some information on the topic of screed between the posts, or placing crossbeams on the screed?

I would not do anything to the screed because of the option for dismantling, only separate it from the wood with felt underlays.