Read the video transcript below
This video will look at steel columns within a run of wall, and will show how this can affect the sound insulation of a partition. For example, if the partition provides an Rw of 50dB, this will reduce to around an Rw of 25dB at the position of a column with no encasement.
Typically, Gyproc DuraLine and Gyproc SoundBloc plasterboards are used on partitions that require good levels of sound insulation.
We’ll now look at low, medium and high acoustic details that can be used for columns within the run of a wall.
Low acoustic details
First, we will look at low acoustics with Glasroc F FireCase. As you can see, three sides of the column are encased with metal studs fixed in place, abutting up to the column.
It’s good practice to run Gyproc Sealant around partition junctions to optimise sound insulation. Not doing this could downgrade the sound insulation of the partition.
Continue to board the partition.
By not insulating within the web of the steel column, this will downgrade the sound insulation at this point in the wall, as well as potentially creating flanking sound around the column encasement.
It is important to use the correct screws for fixing at 150mm centres. Don’t use drywall screws as the Glasroc screw head is designed to countersink into the board surface. You could not do this with drywall screws.
Alternatively, you could use a system called GypLyner Encase. GL10 GypLyner Steel Framing Clips are placed on the column at 800mm centres, and GL1 sections clip on top of the GL10s.
Short sections of GL1 are cut and tabbed, and are fixed to the encasement at 600mm centres to enable fixing of the metal stud against the column.
Again, when the board encasement is fixed in place, this creates a risk of potential flanking sound through the board on the encasement.
By not insulating within the web of the steel column, this would again downgrade the sound insulation at this point in the wall.
Mid acoustic details
Moving on, let’s take a look at some mid acoustic details. This time, when we’re using Glasroc F FireCase, we will insulate within the web of the steel.
We’ll close the column with Glasroc F FireCase by fixing at 150mm centres.
Now we’ll fix plasterboard to the column to the same specification as it is on the walls. The board is fixed in place with Gyproc Sealant. Applying the same plasterboard density around the column as on the wall will improve the sound insulation of the finished wall.
The same process can be followed to improve sound insulation with GypLyner Encase.
High acoustic details
Finally, we will take a look at some high acoustic details, firstly looking at the GypLyner Encase system around the column.
Having installed the insulation, we start to clad the column with plasterboard. We create a break in the boards that is concealed within the line of the partition. By doing this, we minimise any sound transfer through the plasterboard at this point, something called flanking sound. It is important to note that the double layer of plasterboard applied to the partition should also be applied to the column to maintain the same plasterboard density.
Finally, we proceed to install the double layer of Gyproc SoundBloc or Gyproc DuraLine to the partition. This will depend on the system specification being used.
Ultimately, if we want to eliminate any risk of sound loss where partitions butt into a column, we can include the columns within the partition using the GypWall Quiet IWL system, or the GypWall Quiet system with the partition fully boarded on both sides.
It’s important to note that you would need to seek further clarification in relation to fire performance requirements for steel work enclosed or within the line of a partition system.
Want to learn more from our experts? Join one of our product or system training courses: https://www.british-gypsum.com/technical-advice/training