I'm installing a new Jacuzzi tub this summer and will be doing so in a Vancouver High Rise Condo. The owner does not want to bother their neighbors with any kind of Vibration or operation noise. I suggested using the Noble Company's NobleSeal SIS as a primary sound proofing approach.

My thoughts are that the closet should also be soundproofed since the access panel projects a couple inches into this wall. I fear that the closet will act like a speaker box so I plan to use more of this NobleSeal SIS to box out the door and access panel.

Here is some info on the Sound Proofing I'll use.

Sound Reduction: NobleSeal SIS was tested by Riverbank Acoustical Laboratories in accordance with ASTM E 492-90 and ASTM E 90-90. Test construction included a sound rated ceiling, concrete substrate 6” x 6” quarry tile, and latex modified thin-set. Test results follow: IIC = 62, STC = 59 NobleSeal SIS also exceeded code requirements in field tests by acoustical laboratories with other construction configurations. Field tests conducted in compliance with ASTM E 1007.
<ASTM E2179 ∆ IIC = 12 Applicable Standards: City of Los Angeles (RR# 25268) Protects Thin-Set Tile from Cracking: NobleSeal SIS was tested by the Tile Council of North America for system performance in accordance with ASTM C 627 (Robinson Test). NobleSeal SIS passed 14 cycles and was rated for “Extra Heavy Service”. Exceeds “High Performance” criteria for ANSI A118.12 (jig test).

Because this access panel is on the back side there is no need for any fancy tile applications and I can just focus on building it with sound reduction in mind.

One of the benefits of this approach is that I can prepare the floor heat and tile prep before the tub goes in and then use the NobleSeal SIS as both, waterproofing, crack isolation and sound reduction. No need for any other steps!!!