![When numbers lie: Interpreting IIC ratings for flooring underlayment performance - Page 4 of 4 - Construction Specifier When numbers lie: Interpreting IIC ratings for flooring underlayment performance - Page 4 of 4 - Construction Specifier](https://www.constructionspecifier.com/wp-content/uploads/2019/09/Figure5underlay.jpg)
When numbers lie: Interpreting IIC ratings for flooring underlayment performance - Page 4 of 4 - Construction Specifier
![Solid Sound 30-ft x 3.34-ft x 2-mm Standard Polypropylene Flooring Underlayment (100-sq ft /Roll) in the Flooring Underlayment department at Lowes.com Solid Sound 30-ft x 3.34-ft x 2-mm Standard Polypropylene Flooring Underlayment (100-sq ft /Roll) in the Flooring Underlayment department at Lowes.com](https://mobileimages.lowes.com/productimages/448c4827-19f5-4edb-9c9c-6fb7bd54355e/18136008.jpg)
Solid Sound 30-ft x 3.34-ft x 2-mm Standard Polypropylene Flooring Underlayment (100-sq ft /Roll) in the Flooring Underlayment department at Lowes.com
![2mm Rubber Underlayment, QuietSound Rubber Underlayment, 2mm Rubber Underlayment LA, Sound Control Underlayment, Thick Rubber Underlayment 2mm Rubber Underlayment, QuietSound Rubber Underlayment, 2mm Rubber Underlayment LA, Sound Control Underlayment, Thick Rubber Underlayment](https://www.carpetfloorandmore.com/media/catalog/product/cache/c34b88344e97b73c08f511bcd6e163e3/r/o/rolls_2_6_2_1.jpg)
2mm Rubber Underlayment, QuietSound Rubber Underlayment, 2mm Rubber Underlayment LA, Sound Control Underlayment, Thick Rubber Underlayment
![SoundStep XL Premium Foam Underlayment for Laminate, Engineered and Glue-Down Floors - Go For Floors SoundStep XL Premium Foam Underlayment for Laminate, Engineered and Glue-Down Floors - Go For Floors](https://blog.goforfloors.com/wp-content/uploads/2019/11/sound-step-underlayment-ssxlpe600blss-76_1000__95030.1572897993.1280.1280-370x370.jpg)
SoundStep XL Premium Foam Underlayment for Laminate, Engineered and Glue-Down Floors - Go For Floors
![QuietSound 300 sq. ft. 75 ft. x 4 ft. x .079 in. Soft Step Underlayment for Tile, Laminate, and Floated or Glue-Down Wood Floors 0202999 - The Home Depot QuietSound 300 sq. ft. 75 ft. x 4 ft. x .079 in. Soft Step Underlayment for Tile, Laminate, and Floated or Glue-Down Wood Floors 0202999 - The Home Depot](https://images.thdstatic.com/productImages/6c8707af-edcd-4e95-809d-be36967a3c4f/svn/quietsound-underlayment-0202999-64_1000.jpg)
QuietSound 300 sq. ft. 75 ft. x 4 ft. x .079 in. Soft Step Underlayment for Tile, Laminate, and Floated or Glue-Down Wood Floors 0202999 - The Home Depot
![Eco Cork Foam 75 sq. ft. 3 ft. x 25 ft. x 3.2 mm Waterproof Premium Plus 10-in-1 Underlayment - Vinyl Plank, Laminate, Engineered Wood 220000503 - The Home Depot Eco Cork Foam 75 sq. ft. 3 ft. x 25 ft. x 3.2 mm Waterproof Premium Plus 10-in-1 Underlayment - Vinyl Plank, Laminate, Engineered Wood 220000503 - The Home Depot](https://images.thdstatic.com/productImages/7c7cb836-ca5f-4d05-990b-f679dc66dbbb/svn/eco-cork-foam-underlayment-220000503-40_600.jpg)
Eco Cork Foam 75 sq. ft. 3 ft. x 25 ft. x 3.2 mm Waterproof Premium Plus 10-in-1 Underlayment - Vinyl Plank, Laminate, Engineered Wood 220000503 - The Home Depot
![Eco Cork Foam 75 sq. ft. 3 ft. x 25 ft. x 3.2 mm Waterproof Premium Plus 10-in-1 Underlayment - Vinyl Plank, Laminate, Engineered Wood 220000503 - The Home Depot Eco Cork Foam 75 sq. ft. 3 ft. x 25 ft. x 3.2 mm Waterproof Premium Plus 10-in-1 Underlayment - Vinyl Plank, Laminate, Engineered Wood 220000503 - The Home Depot](https://images.thdstatic.com/productImages/3c3c29e2-f788-45d8-9c02-9143fb7c9ee1/svn/eco-cork-foam-underlayment-220000503-64_600.jpg)
Eco Cork Foam 75 sq. ft. 3 ft. x 25 ft. x 3.2 mm Waterproof Premium Plus 10-in-1 Underlayment - Vinyl Plank, Laminate, Engineered Wood 220000503 - The Home Depot
![QuietWalk Laminate and Floating Wood Flooring Underlayment with Attached Vapor Barrier- Sound Reduction, Compression Resistant, Moisture Protection 6'Wx60'L Roll (Covers 360 sq. ft) QW360B1LT" - Carpet Underlayments - Amazon.com QuietWalk Laminate and Floating Wood Flooring Underlayment with Attached Vapor Barrier- Sound Reduction, Compression Resistant, Moisture Protection 6'Wx60'L Roll (Covers 360 sq. ft) QW360B1LT" - Carpet Underlayments - Amazon.com](https://m.media-amazon.com/images/I/71DJ1cOIb2L.jpg)