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Tremco Fire Protection Systems Group Technical Bulletin

Topic: Acoustical Performance and Installation for TREMstop Products Release Date: January 6, 2006

For more information, contact the Technical Service Department at 866-209-2404.

For more information on STC ratings and how to protect joint and openings in acoustically rated assemblies, refer to ASTM C 919 "Standard Practice for Use of Sealants in Acoustical Applications." Acoustical Performance of TREMstop Products: In order to assist contractors in meeting the acoustical performance specifications for their projects, the products in the TREMstop line that are most commonly used in acoustical applications have been independently investigated for their influence on the acoustical performance of a typical assembly type. Detailed information regarding the influence of these products on the acoustical performance of representative assemblies can be found the chart below:

Gypsum Stud Wall 1 One layer of 5/8" gypsum board, with joints taped and filled on either side of 3-5/8" steel studs, spaced 24" oc, with absorptive material (e.g. insulation) in the cavity. ¼" gap at top or bottom of wall. Gypsum Stud Wall 2 Two layers of 1/2" gypsum board, with joints overlapped, taped and filled on either side of 3-5/8" steel studs, spaced 24" oc, with absorptive material (e.g. insulation) in the cavity. ¼" gap at top or bottom of wall. Gypsum Wall 3 Gypsum board wall partition and no absorptive material (e.g. insulation) in cavity. One electrical box on each side of wall in same stud cavity. 50 45 49.6 Concrete Floor

Description of Assembly:

6" thick concrete slab.

Joint / Opening:

6" diam sleeved opening with middle 40% of opening occupied by cable. 53 21 51.4

Initial Assembly STC Unsealed STC TREMstop Smoke and Sound Sealant TREMstop Intumescent Acrylic TREMstop Acrylic (GG) Single ¼" bead on each side. Double ¼" bead on each side. Single ¼" bead on each side. Double ¼" bead on each side. Single ¼" bead on each side. Double ¼" bead on each side. 1/16" thickness on each side. 1/8" thickness on each side. 1/16" thickness on each side. 1/8" thickness on each side. Single ¼" bead on each side. Double ¼" bead on each side. ¼" thickness

45* 26 45 45 45 45 45 45 36 41 36 41 45 45 -

53* 26 53 53 52 53 52 53 37 43 37 43 53 53 -

TREMstop Acrylic-SP TREMstop Smoke & Sounds-SP TREMstop Silicone (FyreSil) TREMstop MP TREMstop Putty

Acoustical Performance (Fire)

Tremco Fire Protection Systems Group 3735 Green Rd. Beachwood, OH 44122 866-209-2404 (phone) 216-514-7575 (fax) www.tremcofirestop.com

Tremco Fire Protection Systems Group Technical Bulletin

Topic: Acoustical Performance and Installation for TREMstop Products Release Date: January 6, 2006

For more information, contact the Technical Service Department at 866-209-2404.

* Per National Building Code of Canada, Table A-9.10.3.A

Many TREMstop products have been independently tested in accordance with ASTM E-90 to determine their ability to maintain the STC Rating of a standard test assembly. The results are listed in the following table: Product Opening Application Baseline wall* Baseline wall* with unprotected openings

Not Available

Baseline wall* with protected openings

61

TREMstop MP

Opening created for 4 in. by 4 in. outlet boxes Opening created for 4 in. by 4 in. outlet boxes 1/4 in. gap 1/4 in. gap 1/8 in. gap 1/8 in. gap

TREMstop Electrical Box Insert TREMstop Putty TREMstop Smoke and Sound Sealant TREMstop Acrylic-SP TREMstop Smoke and Sound Spray

1/4 in. putty pad placed on backside of outlet boxes Single 4 x 4 insert placed inside outlet box 1/4 in. depth to cover the gap 1/4 in. depth in gap 1/8 in. thickness to cover gap 1/8 in. thickness to cover gap

62

62

Not Available

61

62 62 62 62

26 26 33 33

60 59 59 59

*Baseline Wall ­ WP5060. Gypsum Association Manual describes as a STC 65-69 wall.

Acoustical Performance (Fire)

Tremco Fire Protection Systems Group 3735 Green Rd. Beachwood, OH 44122 866-209-2404 (phone) 216-514-7575 (fax) www.tremcofirestop.com

Tremco Fire Protection Systems Group Technical Bulletin

Topic: Acoustical Performance and Installation for TREMstop Products Release Date: January 6, 2006

For more information, contact the Technical Service Department at 866-209-2404.

Recommended Installation Details to Maximize Acoustical Performance of Fire Rated Systems

Unsealed

Sealed

In head of wall joint systems, TREMstop Acrylic (GG) or TREMstop Silicone (Fyre-Sil) is installed within the joint symmetrically on both sides of the wall.

TREMstop Sealant Forming Material

Reference UL System No. HW-D-0016

TREMstop Sealant

TREMstop Smoke and Sound Sealant TREMstop MP

For electrical box membrane penetrations, TREMstop Putty Pads are installed to completely cover the exposed back of the box, and TREMstop Smoke & Sound Sealant is installed to fill any gaps between the boxes and the gypsum board. Reference UL Category: CLIV File Number: 16651 For a cable penetration in a concrete floor, TREMstop Putty and mineral wool provide a re-enterable firestop solution. Reference UL System No. C-AJ-3228

TREMstop Putty

Forming Material

Arrows Show Sound Travel Path Around or Through Partitions.

Drawings not to scale.

Acoustical Performance (Fire)

Tremco Fire Protection Systems Group 3735 Green Rd. Beachwood, OH 44122 866-209-2404 (phone) 216-514-7575 (fax) www.tremcofirestop.com

Tremco Fire Protection Systems Group Technical Bulletin

Topic: Acoustical Performance and Installation for TREMstop Products Release Date: January 6, 2006

For more information, contact the Technical Service Department at 866-209-2404.

In WP5060 Gypsum wall TREMstop Electrical Box Inserts are installed inside outlet boxes on both sides of the wall

In WP5060 Gypsum wall TREMstop Smoke & Sound Sealant is installed within the joint symmetrically on both sides of the wall.

Acoustical Performance (Fire)

Tremco Fire Protection Systems Group 3735 Green Rd. Beachwood, OH 44122 866-209-2404 (phone) 216-514-7575 (fax) www.tremcofirestop.com

Tremco Fire Protection Systems Group Technical Bulletin

Topic: STC Ratings and Use of TREMstop Products for Maintaining Acoustical Performance Release Date: January 6, 2008

For more information, contact the Technical Service Department at 866-209-2404.

What is the STC Rating of a floor or wall? Sound Transmission Class, or STC, is a single number indicator of an assemblys ability to resist airborne sound transmission. The STC rating is indicative of the average reduction in sound levels between two rooms separated by the test assembly, such as a wall or floor, measured in decibels. The higher the STC rating, the greater the sound reduction and the better the acoustical performance of the wall or floor being evaluated. Because it is highly standardized, it is a useful tool for designers to compare the performance of floor or wall designs in order to maximize the comfort and utility of the building. How is the STC rating of a floor or wall determined? STC ratings are determined in accordance with ASTM E-90, "The Standard Method for Laboratory Measurement of Airborne Sound Transmission". In this test method, sounds are generated on one side of the test assembly while microphones on the other side record the sound levels that result. The difference in the sound levels between the rooms on each side of the test assembly is used to determine the STC of the test assembly. The test assembly may be a wall or floor and is usually a standard design that can be specified in project specifications. In order to determine a single value for the test assembly, the values are recorded at different frequencies and adjusted to fit a standardized curve, resulting in the STC rating. Because the test results are standardized, this one value is representative of the relative acoustical performance of the test assembly when compared the STC rating of other test assemblies. ASTM E-90 emphasizes sound levels and types that are typically found in residential areas, such as television, radio, and conversation, as well as sound ranges to which the human ear is especially sensitive. What other considerations can affect the acoustical performance of a floor or wall? STC ratings can help designers compare the performance of typical designs under ideal conditions, but the actual performance of a floor or wall may vary depending on the acoustical environment it is installed in, its surrounding assemblies, and how closely the assembly ,,as built approximates the standard test assembly. Even under laboratory conditions, STC ratings determined experimentally for the same typical design may vary between tests. The STC ratings for typical wall or floor designs assume that the test assembly forms a continuous barrier between the rooms being separated. Therefore, the effects of construction joints and openings for service penetrations are not considered when determining the STC rating. Joints and openings within an assembly provide a more direct path for sound to travel from one side to the other and can significantly increase the levels of sound transmission. For example, consider a gypsum board wall assembly with an STC rating of 53. When a construction joint as small as1/4" is installed at the top of the wall, to accommodate the natural settling of the building, the STC of the wall can drop to as low as 26. That is nearly a 50 percent reduction in the acoustical performance of a wall assembly due to a relatively small joint at the ceiling. How can TREMstop Sealants help to maintain the acoustical performance of fire rated floors and walls? Firestopping materials have not, historically, been evaluated for sound transmission qualities. The growing importance of sound containment is changing this. The STC ratings of sealants cannot be determined directly, but their effect on the acoustical performance of a construction assembly can be measured. This can be used to establish their ability to help maintain the rating of an assembly that has had its performance degraded by joints and openings. In addition to preventing the passage of smoke and flame through joints and openings in assemblies, properly installed firestop materials also form a barrier to sound transmission. The effectiveness of TREMstop sealants in maintaining the STC rating of a floor or wall can be established by comparing: The STC rating of a typical assembly design with no construction joints or openings The STC of the same assembly with unprotected joints or openings, The STC rating of the same assembly with joints and openings protected with TREMstop products. The STC rating associated with the protected assembly depends on several factors including the initial rating of the assembly, the width of the joint or size of the opening, and amount and configuration of the sealant used. In many cases, the acoustical performance of an assembly can be fully or very closely maintained though proper design and installation of TREMstop products. Tremco Fire Protection Systems Group 3735 Green Rd. Beachwood, OH 44122 866-209-2404 (phone) 216-514-7575 (fax) www.tremcofirestop.com

STC Ratings (Fire)

Tremco Fire Protection Systems Group Technical Bulletin

Topic: STC Ratings and Use of TREMstop Products for Maintaining Acoustical Performance Release Date: January 6, 2008

For more information, contact the Technical Service Department at 866-209-2404.

While it is not appropriate to determine the STC rating of a sealant directly, designers need a way to verify that firestopping sealants will help to maintain the acoustical performance of an assembly. To assist in this process, STC ratings are reported on the data sheets for TREMstop sealants. The rating indicated is the rating of a typical fire resistive assembly with a commonly encountered joint or opening that has been sealed with the respective TREMstop product. This is to assure contractors, inspectors, and designers that the firestopping products being used have been evaluated for acoustical performance and demonstrated the ability to help maintain the rating of the assembly. For assembly designs with STC ratings less than or equal the rating indicated for the sealant, installation of the sealant in a configuration consistent with the standard test assembly should maintain the initial assembly design rating. For assembly designs with STC ratings greater the rating indicated for the sealant, the rating of the sealed assembly will be at least as good as the rating indicated for the sealant, and the actual performance can be expected to exceed the rating indicated for the sealant, but be less than the rating for the assembly design. When are TREMstop Sealants used to maintain the acoustical performance of fire rated floors and walls? The traditional applications for which STC Ratings have been required are head of wall joints and electrical outlet boxes for party or corridor walls. The performance of firestopping products in these applications can significantly improve the performance of the wall, if the materials are utilized to their best effect. For fire rated head, bottom, or side of wall joints, Tremco recommends installing the firestop sealant in accordance with an approved listed firestop system. This will help to ensure that the goals of life safety and occupant comfort are both met. For strictly acoustical applications, or for non-fire rated smoke partitions, we recommend that the joint be constructed as specified by the gypsum wall board manufacturer, with the installation of one or two layers of sealant between the top of the gypsum board and the bottom of the floor-ceiling assembly. See the Tremco Fire Protection Products STC Chart for additional details. For electrical outlet boxes in fire rated walls, Tremco recommends protecting the electrical outlet box with TREMstop MP moldable putty pads. By creating a continuous membrane of sound deadening material around the back of the outlet box, TREMstop MP putty pads prevent sound from being transmitted through the gaps, punch-outs and connections found in electrical outlet boxes. For maximum acoustical performance, we also recommend installing a1/4-in. thick bead of TREMstop Acrylic, TREMstop Fyre-Sil, or TREMstop Smoke & Sound Sealant around the periphery of the box at the gypsum board interface. For walls with continuous sound absorptive material installed in the stud cavity, installation of TREMstop Electrical Box Inserts, in lieu of TREMstop MP putty pads, will result in acoustical performance that is as good or better than the same assembly without the TREMstop Electrical Box Inserts. Another acoustical application of importance is the joint between the edge of the floor slab and the interior face of the curtain wall assembly. It is becoming more common for designers and codes to demand an STC rating at the slab edge. Firestopping materials used to protect this joint from the through-passage of flames can also contribute to the acoustical performance of the assembly. Due to the wide variety and variation in curtain wall systems, testing of specific designs for this type of application is rare. However, it is possible to evaluate the effect of a Tremco firestop sealant in a floor joint assembly with a known STC rating. From this, we can conclude that the joint system itself contributes to the acoustical performance of the overall assembly, and project design professionals can incorporate this information, along with the performance of the curtain wall, ceiling, flooring, knee-wall, and other assemblies to maximize the acoustical performance of the edge of slab joint system.

STC Ratings (Fire)

Tremco Fire Protection Systems Group 3735 Green Rd. Beachwood, OH 44122 866-209-2404 (phone) 216-514-7575 (fax) www.tremcofirestop.com

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