Armstrong Flooring S-1841 Quiet Comfort™ Floating Underlayment DATA SHEET

​​​​For Use With

Product Information

Gauge.02″ (0.5mm)
Width6 ft.
Length16.67 ft.
Acoustical DataArmstrong Alterna Engineered Tile Flooring & S-1841 Quiet Comfort™ Floating Underlayment:
IIC = 57 over 6” concrete with Suspended Ceiling  (ASTM E 492)
STC = 62 over 6” concrete with Suspended Ceiling (ASTM E 90)
InstallationLocation: All grade levels. Use on concrete, approved suspended wood underlayment including particleboard and OSB, approved existing resilient floors.
System: Engineered Tile Installation System
Glue Engineered Tile to S-1841
TypeGray saturated & polyester roll/Sheet
AdvantagesFor Armstrong Flooring Engineered Tile products

Turns any  Engineered Tile product into a floating floor.

Loose lay underlayment over subfloors without adhesive

Suitable for grouted or non-grouted installations

Increases acceptable subfloor options

Able to install over particleboard, OSB, waferboard and Sturd-I-Floor (total minimum deck thickness 1″ for Alterna Engineered Stone products)

Easy to install
Lays flat and cuts easily
Reduces subfloor preparation
Don’t have to remove residual adhesives, floor polish or paint overspray
Don’t have as much patching or leveling required
Don’t have to worry about adhesion issues from concrete curing agents or sealers
Simplifies flooring installation
Don’t have to offset Alterna joints from subfloor joints
Adhesive spreads easily over underlayment surface

Acoustical underlayment reduces through-the-floor and in-room footfall noise

Built-in moisture barrier which resists mold and mildew
No RH limit
Moisture barrier – limits moisture vapor transmission

Warranted for the life of the Armstrong flooring.

Made in the USA and patent pending
Coverage100 sq. ft. per roll
Manufacturing LocationUSA
LanguageEnglish/Spanish/French English/Spanish/French  English/Spanish/French
Size100 sq ft / roll350 sq ft / roll1,600 sq ft / roll
Item No.01841101X2411205X2410205
Item/ UPC042369882507 N/A042369909327
Dimensions6′ x 16.7′6′ x 58.3′6′ x 225′
Weight Per Piece21.5 lbs64 lbs.280.5 lbs
Weight Per Carton2890 lbs2354 lbs286.5 lbs
Rolls Per Carton148361
Cartons Per Pallet111


Resilient Sheet Flooring Products and Resilient Tile Flooring Products Material Information Sheet (MIS)

Recommended Substrates

Do not install over:

  • Existing cushion-backed vinyl flooring
  • Existing resilient tile floors below grade
  • Not compatible with Armstrong Flooring Flip spray adhesive

Application Instructions

  • Make sure the subfloor is clean, flat, dry and sound. It is important that the subfloor is free of all debris. Check the subfloor for unevenness or protruding objects such as nails or screws. The S-1841 underlayment can be installed over paint over spray or sealers. Make sure to scrape any loose debris.
  • When installing over concrete, the concrete must be dry with no visible signs of moisture. Installation may begin when concrete is visibly dry.
  • S-1841 should be installed shiny side up and all seams must be taped, including when installing over wood subfloors.
  • Make sure the underlayment is lying flat before proceeding with the installation.
  • Begin in a corner and install the underlayment parallel to the wall in the opposite direction you plan to install the flooring planks. Leave at least 2˝ of excess underlayment up the wall and trim after completing the floor installation.
  • Roll out the next roll of underlayment in the same manner, making sure that the seams are butted together. Attach seams by using clear 2″ wide packing tape, centered parallel over the seam. When installing on concrete or below grade subfloors, be sure to tape the seams together with 2˝ tape that meets the moisture vapor transmission rate for this type of installation.
  • Do not use masking tape, blue painter’s tape or duct tape to tape the seams together. Clear packing tape only.
  • Do not overlap the underlayment at any point in the installation.
  • Do not have the seam of the underlayment align to the seam of the flooring.
  • Install the flooring according to Armstrong Flooring’s installation instructions. The planks should be installed perpendicular to the underlayment.
  • In residential applications where there are pivot points, door jams, or if tile is installed in direct sunlight, recommended adhesives to adhere underlayment to subfloor are S-295, S-299, and S-1000. Glue the underlayment to the subfloor with a 3” band of adhesive around the perimeter and at the seams or full spread adhesive. Follow the adhesive RH limit when adhering to the subfloor.
  • Areas of heavy rolling loads, high traffic or if tile is installed in direct sunlight, glue the underlayment to the subfloor with a 3” band of adhesive (S-995 or S-1000 only) around the perimeter and at the seams or full spread adhesive. Follow the adhesive RH limit when adhering to the subfloor. Do not use Flip Spray Adhesive, S-315 or S-319 .
  • Note: When installing competitive tile products and adhesives make sure to glue the underlayment to the subfloor or place a 3” band under every seam and around the perimeter of the room. Using the adhesive manufacturer’s trowel.
  • Do not fit the flooring tight against any vertical objects. Leave 1/8” expansion space around all vertical objects.
  • Do not leave any voids in the adhesive. Spread adhesive on the entire area. The adhesive must be troweled on, not rolled on.
  • All tile products floating should not be exposed to direct sunlight for prolonged periods. It can result in discoloration and excessive temperatures that may cause expansion. The use of drapes or blinds is recommended during peak sunlight exposure. If drapes or blinds are not going to be used and expansion occurs in this area, we recommend adhering this area with S-295 or S-995 or S-1000. Adhesive using the fine notch trowel. If using S-1841 underlayment in these areas the underlayment must be adhered to the subfloor and the tile adhered to the underlayment.

Two Step Installation Process

  1. Glue down the underlayment to the subfloor (adhesive must be dry to touch, use a broom to push the S-1841 into the adhesive) or float underlayment over subfloor
  2. Glue down or float floor over underlayment according to the table below.
ProductFlooring to Underlayment Underlayment to Subfloor
Required to GlueMay Glue or Float

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Updated on September 14, 2022