Acoustic sealant for interior wall partitions
Tremflex 834 lists the use. Check your wall assembly requirements before specifying it.
Yes. Tremco recommends Tremflex 834 as an acoustical seal in interior walls, ceilings and floors. Its data sheet also says it has been tested for acoustical properties to reduce sound transmission in partition walls. For a contractor or purchaser, that supports considering it for the job, but doesn’t establish a sound rating for your finished wall.
Start with the project’s wall detail. Confirm the specified sealant, bead locations and dimensions before ordering. The Tremflex 834 sheet doesn’t supply an acoustic assembly drawing, an STC rating or a firestop system.
Check the assembly before ordering tubes
Buying for a partition with a specified sound rating? Ask the designer to confirm that Tremflex 834 suits the assembly. Don’t turn a listed acoustic use into a promise about the completed wall.
Tremflex 834 bonds to common construction substrates without primer, Tremco says, but it still recommends testing adhesion on the materials you'll use for the job. A mock-up or a field test—either way, use your actual job materials.
Prepare the joint, then fill and tool it
Before Tremflex 834 goes on, you've got some removal work: release agents, existing waterproofing, dust, loose mortar, laitance, paint and other finishes. Once those are off, check that the surface underneath is sound, clean and dry. Still damp or contaminated? Don't apply the sealant. Read the sealant's MSDS at www.tremcosealants.com for ventilation, Personal Protective Equipment (PPE) and other health concerns.
Tremco recommends a surface temperature of at least 5°C during application. Below that, consult its cold-weather application guide rather than assuming the same procedure applies.
Fill the joint from the bottom with conventional caulking equipment. Tool immediately with a spatula so the sealant contacts the joint walls. Dry tooling is preferred; the sheet allows a little water on the spatula if needed.
Don’t guess the bead depth
For joint backing, Tremco recommends closed-cell or reticulated polyethylene backer rod. It controls the sealant depth and helps you get contact with the joint walls during tooling. If the joint's too shallow for rod, use adhesive-backed polyethylene bond breaker tape to prevent the sealant from sticking on three sides. Rod or tape, keep the backing dry.
Use the project’s acoustic detail alongside the manufacturer’s joint guidance. The sheet’s 6 mm contact-area instruction for window and door fillet beads isn’t an acoustic partition detail.
Protect the material before installation
Don't let Tremflex 834 freeze. Tremco directs you to store it between 5°C and 43°C, with the original, undamaged packaging kept in a clean, dry, protected spot.
Start with the [Tremflex 834 product details](/tremflex-834/). Need help checking whether it fits the job? Send Cranco your wall detail, joint dimensions and adjoining materials. For a partition that also needs fire resistance, make a separate request for the specified firestop system.