The STC rating is 67 and the IIC Rating is 71, which gives you even better noise absorption than the leading premium underlayment! Kronoswiss’ MicroPumping System provides air circulation underneath the boards when you walk on it, inhibiting the growth of mold and mildew on your subfloor!

What is a good STC rating for underlayment?

The higher the number, the higher the resistance – the better. To meet International Building Code – both IIC and STC need to meet the minimum of 50 to pass. Many larger luxury condo associations and municipalities are now looking at the higher 50’s and lower 60’s range.

What is the STC rating for cork underlayment?

Most cork underlayment will have a STC score of 50 for 6mm thick (1/4″). If you double the thickness to 12mm (1/2″) you only get 50% of the benefit of 1/4″ with a total STC score of 75. Meaning 1/4″ cork underlayment provides the most bang for the buck in controlling sound.

What is a good STC rating for floors?

The STC rating for a basic wood structure floor/ceiling is STC 40-43. The STC rating for a six inch concrete sub-floor is 52-55. A good level of isolation for walls and ceilings is STC 50 plus. A high level of isolation for walls is STC 60 plus with ceilings at STC 50 plus.

Can you add STC ratings?

You can’t add STC ratings together. For instance, if you have an STC of 40 on one wall and decide to add another wall with an STC of 20, the STC of both walls combined will not be 60. Instead, the STC will be calculated using logarithms, and will probably produce a rating of about 45.

What is the STC rating of 2 layers of 5/8 drywall?

With two sheets total, of 5/8” drywall utilizing standard insulation we often see STC ratings ranging between 30-34. With two total sheets of ½” drywall (common for residential interior walls) we usually see an STC rating of around 33.

How is STC rating calculated?

Find the average transmission loss: Add up all the total frequencies you recorded, then divide that number by the total number of frequencies you tested. For example, if you recorded all 16 frequencies, divide your total by 16. The number you calculate is your STC rating.

What is the STC rating of 5/8 drywall?

Typical existing wall construction (the most common method is wood stud construction with insulation and 5/8” drywall on both sides) has an STC rating of 30 to 34.

How do I get a 50 STC rating?

Add Soundproofing Membranes: If you need to achieve an STC of 50 or higher, consider using a soundproofing membrane. These products offer decoupling by separating the drywall from studs, and also significant mass increases.

Can I use cork as a subfloor?

Installation Options Yet another benefit of cork as a hardwood, tile, or laminate flooring underlayment is its ease of installation. … Generally, cork can be installed as a floating underlayment that is not adhered to the original subfloors or by gluing the cork in place.

Article first time published on

Is cork underlayment the best?

Cork absorbs sound better than most underlayments. … Cork is also an eco-friendly choice in underlayment. Plus, the natural antimicrobial nature of cork prevents the growth of bacteria, mold, and mildew as well. That makes cork a great choice for allergy sufferers.

Is cork underlayment soundproofing?

Cork is an inexpensive soundproofing underlay. It reduces sound transfer and echo, and is water-resistant. Cork will last for years and doesn’t deteriorate or off-gas noxious fumes like other underlays.

What STC rating is soundproof?

In many cases less noise will be coming through the Soundproof Windows than the walls. Most walls have an STC of 43-48: Soundproof Windows usually have an STC rating of 48-54.

What does STC 60 mean?

Loud speech audible, music easily heard. STC 52-55. Loud speech audible if straining to listen, music can be heard and may still be disturbing. STC 57-60. Loud speech essentially inaudible, music can be heard faintly but bass may still be disturbing.

Is STC the same as dB?

Conclusion: A “1 STC” difference is equivalent to a “1 dB” reduction in sound transfer. An STC 50 moveable wall will reduce sound by 50 dB.

What does STC rating mean?

6 Sound transmission class. Sound transmission class (STC) is a rating of sound isolation of a building wall assembly. The higher the STC rating, the better sound isolation the wall assembly is to achieve. STC is widely used to rate interior partitions, ceilings/floors, doors, and windows.

What does STC 45 mean?

A sound blocking level of STC 45 means that a listener in a quiet room would hear raised speech in adjacent rooms, but would not be able to understand the conversation. The transmitted noise would not typically be disruptive. … Examples include patient rooms1, enclosed offices2, and classrooms along corridors3.

How do you calculate STC for walls?

1. 5/8″ metal studs, 5/8″ drywall (2 layers total), No insulation = STC of 38-40.
2. 2×4 stud, 5/8″ drywall (2 layers total) Plus Batt insulation = STC of 34-39.
3. 5/8″ metal studs, 5/8″ drywall (2 layers total) Plus Batt insulation = STC of 43-44.

What is the STC rating of QuietRock?

QuietRock 545 on a single stud wall has an STC rating of 56.

Is STC 60 good?

An STC rating of 20 is considered very poor while a rating of 60 is considered excellent . For example, if you were in a room where a wall joining an adjacent room had an STC rating of 20 you would be able to hear someone speaking at a low volume through that wall.

What is an STC 50 wall?

A sound blocking level of STC 50 means that a listener in a quiet room would need to exert effort to hear raised speech levels in adjacent rooms, and the speech would not be understandable or disruptive.

Is QuietRock fire rated?

QuietRock® 530 is a fire rated, 5/8” impact resistant sound damping gypsum panel equipped with a thin layer of steel in the center.

What is the best acoustic insulation?

• Roxul Rockwool 80 Acoustic Mineral Wool Insulation. …
• Auralex Acoustical Mineral Fiber Insulation. …
• Owens Corning 703 With ASJ Facing. …
• Acoustimac Eco Cellulose Insulation. …
• Foam It Green 602 Spray Foam Insulation.

What is the STC rating of 1/2 inch drywall?

STCPartition type27Single pane glass window (typical value) (dual-pane glass window range is 26–32) “STC Ratings”.33Single layer of 1/2″ drywall on each side, wood studs, no insulation (typical interior wall)39Single layer of 1/2″ drywall on each side, wood studs, fiberglass insulation

Which wall assembly has the best STC rating?

1. Insulation will noticeably improve the STC rating of an assembly. …
2. Staggered or double stud walls are higher rated than single stud walls. …
3. Metal stud walls perform better than wood stud walls.

Is drywall a good sound barrier?

There are many reasons why you might want to create a sound barrier in your home. … While conventional drywall will help muffle sound, it won’t completely block out noise. Most drywall has a solid core made of gypsum, a mineral made of calcium sulfate that is commonly used in building projects.

Can you use cork underlayment vinyl planks?

Cork underlay can be used under Hardwood, Laminate, Cork, Vinyl plank (LVT), carpet, tile, & marble and suitable for nail down, glue down, and floating installations.

What do you put under cork flooring?

An installation is only as good as the surface below. Natural cork squares must be glued to a flat, smooth surface. You can’t install them directly over plank flooring, vinyl or linoleum. You’ll need to screw a plywood underlayment at least 1/4 in.

Is cork flooring good for high traffic areas?

Solid Durability Cork is naturally springy and typically bounces back to its original shape, so areas with high foot traffic are a great fit for this material. Unlike hardwood, small scratches will blend in with the floor’s design.

How thick should my underlayment be?

Underlayment. Underneath the top flooring layer is often (though not always) an underlayment. It comprises padding materials and is typically about 1/4 to 1/2 inch in thickness. The purpose of the underlayment is to provide a sturdy yet comfortable layer for your outer flooring to sit on.

Is rubber underlayment better than cork?

Acoustics and Sound Reduction When it comes to sound, rubber underlayment wins against cork. While cork is capable of reproducing the same amount of noise reduction, it needs significantly more material to achieve it. To get the same benefits, cork needs to be 30% thicker than rubber underlay.