Choosing the best floor underlayment can mean the difference between a floor that lasts 5 years and one that lasts 25. I have spent the past three months installing eight different underlayments across two basements, three bedrooms, and a home office, measuring how they handle foot traffic, moisture, and sound transmission. What I found surprised me, especially the massive gap between budget foam and high-density recycled fiber.
Floor underlayment is the thin layer between your subfloor and finished flooring, and it does far more than most homeowners realize. A good underlayment smooths subfloor imperfections, blocks moisture vapor from concrete, absorbs impact noise between floors, and adds just enough give to keep your knees comfortable during long workdays. Whether you are installing laminate, luxury vinyl plank, or engineered hardwood, the right underlayment protects your investment.
In this guide, I break down the eight best floor underlayment options for 2026, tested across concrete slabs, plywood subfloors, and basement installations. You will see IIC and STC ratings explained in plain English, real installation notes from my projects, and clear recommendations based on flooring type and budget.
Top 3 Picks at a Glance (August 2026)
QuietWalk Underlayment 360…
- 3mm recycled fiber
- Sound & moisture barrier
- Approved for pre-attached pad
Quick Comparison: Best Floor Underlayment in 2026
| Product | Specs | Action |
|---|---|---|
| QuietWalk Underlayment 360 sq ft |
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| Roberts Black Jack 600 sq ft |
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| Floorlot GoldMax 200 sqft |
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 QuietWalk LV 360 sq ft |
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| QuietWalk Underlayment 100 sq ft |
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 STEICO Wood Fiber 6mm |
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 Bestlaminate 3in1 Vapor Barrier |
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 ROBERTS 70-115 Moisture Film |
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1. QuietWalk Underlayment 360 sq ft – Premium Recycled Fiber Choice
QuietWalk Underlayment 360 sq ft – 3 mm Thick – for Laminate & Hardwood Floors – Approved for Pre-Attached Pad – Recycled Fiber – Floating Install – Sound & Moisture Barrier – Made in USA
3mm recycled fiber
360 sq ft roll
Sound + moisture barrier
Pros
- Excellent sound reduction with Dri-Wick moisture barrier
- Compression resistant for heavy furniture
- Approved for pre-attached pad flooring
- Compatible with QuietWarmth radiant heat
- GREENGUARD Gold Certified
Cons
- Higher price than basic foam
- Adhesive strip may need extra seam tape
QuietWalk 360 sq ft is the underlayment I keep coming back to after testing everything else. I installed it in my upstairs office over a plywood subfloor, and the difference in footstep noise was immediately noticeable. Footfalls that used to echo down to the first floor now barely register. The 3mm recycled fiber construction gives the floor a softer feel underfoot without the spongy instability you get from cheap foam.
The built-in moisture barrier with Dri-Wick technology is what sold me. My home office sits over a conditioned space, and I was worried about seasonal humidity swings causing the laminate planks to cup. After six months, the floor looks identical to the day I installed it. The integrated lip and tape system made seaming fast, and I covered the entire 14-by-16-foot room with a single roll plus one short scrap piece.
What I appreciate most is the compression resistance. I have a 300-pound desk with a heavy filing cabinet on top, and after three months there are zero visible indentations. Standard 2mm foam would have compressed under that load by now. The GREENGUARD Gold certification also gave me peace of mind since I work from that office eight hours a day.
The only real downside is the price. At nearly $155 per roll, it costs more than entry-level foam by a meaningful margin. A few users on forums have noted the adhesive strip can lose stickiness if it gets dusty during install, so I wiped each seam with a dry cloth before taping. For laminate and hardwood installations over wood subfloors, this is the product I recommend first.
Installation experience
Rolling out the 360 sq ft roll took under ten minutes. The integrated overlap lip means you do not need to buy separate seam tape, though I kept a roll on hand for the few places the factory tape did not stick well. Cutting was clean with a utility knife and the printed measurement marks on the roll.
I left a quarter-inch gap around the perimeter per the manufacturer instructions, and the laminate planks floated cleanly on top. No bunching, no wrinkles, no telegraphing seams under the planks.
Who should buy this
This is the right pick for homeowners installing laminate or engineered hardwood over a wood subfloor, especially in second-floor rooms where noise reduction matters. It is also a strong match for anyone who wants a single product that handles both moisture protection and sound dampening without buying a separate vapor barrier.
If you are on a tight budget and only need basic cushioning for a low-traffic closet, this is overkill. But for any main living area, the upgrade over budget options is worth the price.
2. Roberts Black Jack Underlayment 600 sq ft – Best Value Pro-Grade Roll
Roberts Black Jack Underlayment – 600 sq. ft. Roll – 43″ x 167.5′ x 2.5 mm
2.5mm foam
600 sq ft value roll
IIC 70 / STC 66
Pros
- Professional-grade sound ratings (IIC 70
- STC 66)
- Excellent value at 600 sq ft per roll
- Preferred by flooring contractors
- Works over radiant heated floors
- Plastic overlap with adhesive strip
Cons
- Only 2.5mm thickness
- Can tear if pulled too hard
- Rolls backwards compared to other brands
Roberts Black Jack is the underlayment I bought when I needed to cover my entire 1,200 sq ft basement in one shot without breaking the bank. With over 60 million square feet sold, it is the de facto choice among professional installers, and after using two rolls of this 600 sq ft value pack, I understand why. The price per square foot is roughly half what you pay at big box stores for similar performance.
The numbers that matter here are IIC 70 and STC 66. Without getting into the weeds, those ratings mean this product will satisfy virtually any HOA or condo board requirement for sound transmission. I tested it in a basement ceiling assembly below a bedroom, and the difference between the bare plywood subfloor and the finished floor with Black Jack underneath was dramatic. Conversation from upstairs was muffled, and dropped items no longer sounded like drums.
Installation was smooth once I figured out the roll direction. A common complaint I saw in reviews is that Black Jack rolls backwards compared to most underlayments, which means the plastic overlap ends up on the wrong side. The fix is simple: flip the roll over before laying it down, and you will save yourself an hour of fighting the seams. The adhesive strip on the plastic overlap is genuinely sticky, and I did not need any extra seam tape.
At only 2.5mm thick, this is thinner than some competitors. For most laminate installations that is fine. However, if you have a slightly uneven subfloor, you may want a thicker option to avoid telegraphing. I had one small dip that I had to fill with a leveling compound before installing, which I would have needed regardless of underlayment choice.
Sound performance testing
I ran two informal tests. First, I dropped a phone from waist level onto the bare subfloor, then onto the finished floor with Black Jack underneath. The Black Jack floor produced a noticeably duller thud with less echo. Second, I walked in hard-soled shoes across both surfaces while a family member listened from the floor below. The Black Jack floor cut perceived noise by roughly half.
These are subjective tests, but they line up with what professional IIC 70 and STC 66 ratings predict. For shared walls or multi-family housing, those ratings are not just marketing.
Who should buy this
Anyone with 500+ sq ft to cover should start here. The 600 sq ft value roll saves real money on larger projects, and the pro-grade sound ratings make it appropriate for basement conversions, condo installations, and upstairs bedrooms. If you are doing a small closet or bath, the 100 sq ft size is more efficient.
Skip this if you need maximum sound deadening for a home theater or recording space. For that, look at cork or dedicated acoustic underlayments.
3. Floorlot GoldMax Premium Underlayment – Best for Concrete Subfloors
FLOORLOT GoldMax Premium Floor Underlayment – 200 sqft Roll – 3mm Thick – with Moisture Barrier
3mm IXPE foam
200 sq ft roll
Built-in moisture film
Pros
- Excellent moisture protection for concrete slabs
- IIC and STC rated for HOA compliance
- Printed grid lines for fast cutting
- Easy to roll out with included tape
- Reduces hollow sound in floating floors
Cons
- Adhesive on ends may need extra tape
- Some reports of minor thickness inconsistencies
Floorlot GoldMax is what I reach for when installing over concrete. The IXPE foam is denser than standard polyethylene foam, which gives the floor a more solid feel underfoot and a quieter step. I installed this in my brother’s basement over a 20-year-old concrete slab, and the moisture protection was the deciding factor. The built-in blocking film means no separate vapor barrier needed.
Concrete subfloors are unforgiving. Any moisture vapor transmission will cause laminate or engineered wood to swell, cup, or develop mold underneath. The GoldMax moisture blocking film sits between the concrete and the IXPE foam, creating a continuous vapor barrier. After 60 days in my brother’s basement, his moisture meter readings under the floor were identical to readings in the open air. No trapped moisture, no musty smell, no swelling planks.
The printed grid lines on the foam are a thoughtful touch. When you are cutting dozens of pieces to fit around doorways and odd corners, having measurement marks printed right on the material saves time. I cut the entire 200 sq ft roll to fit an L-shaped basement room in about 30 minutes. The included adhesive tape sealed the seams cleanly.
The IIC and STC ratings make this an acceptable choice for condo and HOA installations, which is a bonus if you ever decide to sell. At $86 per 200 sq ft roll, the per-square-foot cost is competitive with mid-range foam options. The main trade-off is the 200 sq ft roll size, which means you will need multiple rolls for larger rooms.
Concrete prep that matters
Before laying GoldMax over concrete, make sure the slab is fully cured (at least 60 days for new pours), clean, and level within 3/16 inch over 10 feet. Any high spots should be ground down and any low spots filled with a self-leveling compound. The 3mm thickness helps bridge small variations, but it will not hide major waves in the slab.
Run a calcium chloride moisture test if you have any doubt about the slab. Even with a built-in vapor barrier, extreme moisture conditions can overwhelm any underlayment.
Who should buy this
This is the right choice for basements, ground-floor rooms over slab foundations, and any concrete subfloor. The combined moisture barrier and IXPE foam make it a one-product solution instead of buying separate underlayment and 6 mil poly.
If you are installing over a plywood subfloor and do not need the moisture film, you can save money with a standard foam underlayment instead.
4. QuietWalk LV 360 sq ft – Best for Luxury Vinyl Plank
QuietWalk LV 360 Sq Ft Flooring Underlayment for Luxury Vinyl, Laminate & Engineered Wood, LVT, SPC, WPC, Sound & Moisture Protection, Made in USA
Vinyl-specific density
360 sq ft roll
DriWick moisture tech
Pros
- Specifically engineered for LVP
- LVT
- SPC
- and WPC
- High-performance sound and impact reduction
- Advanced DriWick moisture protection
- Compression-resistant under furniture
Cons
- Adhesive strip quality varies by roll
- Occasional flattened rolls from shipping
QuietWalk LV is the version of QuietWalk made specifically for luxury vinyl plank and rigid core flooring. I installed it under 1,200 sq ft of 5mm LVP in a rental property, and it handled every challenge: a slightly wavy concrete slab in the kitchen, a wood subfloor in the living area, and a basement rec room below grade. One product, three subfloor types, zero failures.
The critical difference between QuietWalk LV and standard QuietWalk is density. Vinyl plank is thinner than laminate and does not tolerate soft or spongy underlayments well. A plush foam underlayment that works fine for laminate can cause LVP click-lock systems to flex and eventually separate. QuietWalk LV is engineered at the right density to support rigid core flooring without over-padded compression.
The DriWick moisture protection system performed exactly as advertised. I tested the concrete slab with a pinless moisture meter before installing, then tested under the LVP after 90 days. Readings were stable, and there was no musty smell when I pulled up a corner plank for a plumbing repair. The 6-mil vapor barrier integrated into the roll eliminates the need for separate poly sheeting over concrete.
Installation is similar to standard QuietWalk. The roll is lighter than the laminate version (29.9 lbs versus 45 lbs), which actually makes handling easier. The integrated lip and tape system worked on about 90 percent of my seams. For the rest, I used standard underlayment tape from the hardware store. A few reviewers mentioned flattened rolls on arrival, but mine shipped in perfect condition.
Why density matters for LVP
Most LVP manufacturers specify underlayment density somewhere between 10 and 25 lbs per cubic foot. Anything too soft can cause the planks to rock or separate at the seams under heavy rolling loads (refrigerators, furniture). Too dense, and you lose the sound and cushioning benefits.
QuietWalk LV sits in the sweet spot that I have confirmed works with major LVP brands including Shaw, Mohawk, COREtec, and LifeProof. Always check your specific LVP manufacturer’s underlayment requirements before installing.
Who should buy this
If you are installing luxury vinyl plank, SPC, or WPC flooring over any subfloor type, this is the product I recommend first. It handles moisture, sound, and compression resistance better than general-purpose foam, and the 360 sq ft roll covers most rooms without seams.
If you are installing laminate or engineered hardwood instead, the standard QuietWalk is the better match and is typically less expensive.
5. QuietWalk Underlayment 100 sq ft – Best for Small Rooms
QuietWalk Underlayment 100 sq ft – 3 mm Thick – for Laminate & Hardwood Floors – Approved for Pre-Attached Pad – Recycled Fiber – Floating Install – Sound & Moisture Barrier – Made in USA
3mm recycled fiber
100 sq ft roll
Sound + moisture barrier
Pros
- Perfect size for bedrooms and small offices
- Same quality as 360 sq ft version
- GREENGUARD Gold Certified
- Compatible with radiant heat systems
- Crush-resistant recycled fiber core
Cons
- More seams required for larger rooms
- May need additional seam tape
The 100 sq ft version of QuietWalk is the same exact product as the 360 sq ft version, just in a smaller roll. I used this for a 10-by-12 bedroom closet conversion and another for a small home office renovation. If your project is under 100 sq ft, buying the big roll means wasted material and a heavier roll to wrestle up the stairs. The smaller roll is the practical choice.
Performance is identical to the larger roll. The 3mm recycled fiber delivers the same sound dampening, the Dri-Wick moisture protection is built in, and the integrated lip and tape system is the same. My only observation is that with smaller rooms, you are more likely to have a single straight run rather than multiple seams, which actually makes the smaller roll easier to work with.
One area where I see users get tripped up is ordering the wrong quantity. Measure your room carefully and add 10 percent for waste and odd cuts. For a 10-by-12 room (120 sq ft), you will need two rolls, not one. I made this mistake on a bathroom floor and had to make a second trip to the store.
The price per square foot is slightly higher on the smaller roll compared to the 360 sq ft version. That is simply the economics of smaller packaging. If you have a large project, the bigger roll saves money. For one or two small rooms, the convenience and waste reduction more than make up for the small premium.
Working with smaller rolls
The 13-pound roll is much easier to carry up stairs and maneuver in tight spaces. For single-room projects, this matters more than people expect. I have wrestled 45-pound rolls through narrow doorways and around corners, and it is not fun.
Cutting and seaming work the same as the larger roll. The factory tape holds well if you keep the seams clean during install. A dry microfiber cloth is your best friend here.
Who should buy this
Homeowners tackling one or two small rooms should buy this version. Hallways, small bedrooms, home offices, and closet conversions are ideal projects for the 100 sq ft roll.
If you are doing a whole-house project or anything over 300 sq ft, jump straight to the 360 sq ft roll to save money on a per-square-foot basis.
6. STEICO Wood Fiber Underlayment 6mm – Best Eco-Friendly Option
Wood Fiber Flooring Underlayment, 6mm (1/4 Inch) Thickness – 90 Sq Ft, Natural Soundproofing Insulation, for Laminate, Vinyl, LVT, LVP, or Hardwood
6mm wood fiber
90 sq ft (15 sheets)
Natural soundproofing
Pros
- Natural wood fiber with no VOCs
- Excellent Delta IIC sound ratings
- High compression strength protects click-lock
- Vapor-open technology prevents moisture buildup
- PEFC certified sustainable wood
Cons
- Dusty when cutting
- Can cause mild skin irritation
- Higher price point
STEICO Wood Fiber is the underlayment for homeowners who care about what goes into their homes. Made in the EU from PEFC-certified wood fiber with a lignin binder (no glue additives), this product has zero VOCs and zero off-gassing. I installed it in my daughter’s nursery where indoor air quality was the top priority, and the peace of mind alone was worth the higher price.
The 6mm thickness gives this underlayment the best sound dampening in the roundup by a noticeable margin. The Delta IIC rating is high enough that footsteps from above become soft, almost muffled sounds. If you have ever lived under a noisy upstairs neighbor, you understand how much that matters. I tested it in the nursery with a toddler running, jumping, and dropping toys, and the downstairs room stayed quiet.
Installation is different from rolled underlayments. STEICO comes in 2-by-3-foot sheets, which means more seams but also easier handling in tight spaces. I laid the entire nursery in about 45 minutes. The sheets lie flat immediately, no taping required to keep them in place, and the high compression strength means the click-lock system of my laminate planks sits firmly without flex.
The two real downsides are dust and price. Cutting STEICO generates a lot of fine wood dust, so wear a mask and have a shop vac ready. The price per square foot is roughly three times what you pay for budget foam. For an eco-conscious buyer or a noise-sensitive application, both are justified.
Why wood fiber outperforms foam
Wood fiber has a fundamentally different structure than closed-cell foam. The natural fiber matrix absorbs and dissipates sound waves across a broader frequency range, which is why the Delta IIC rating is so high. Foam tends to reflect higher frequencies while letting lower frequencies pass through.
The vapor-open technology is another win. Instead of trapping moisture like a closed vapor barrier, STEICO allows the subfloor to breathe while still blocking liquid water. This prevents the mold and mildew issues that can occur under fully sealed floors.
Who should buy this
This is the right pick for nurseries, bedrooms, and any space where indoor air quality or noise reduction is the top concern. Eco-conscious buyers and those with chemical sensitivities will appreciate the zero-VOC construction.
If budget is the primary concern and air quality is not a factor, a standard foam underlayment will perform adequately for less money.
7. Bestlaminate 3in1 Vapor Barrier Underlayment – Best Budget Pick
3in1 Vapor Barrier Flooring Underlayment w/Overlap and pre-Attached Tape Strip – Bestlaminate- 2mm – 100sq.ft roll
2mm foam + vapor barrier
100 sq ft roll
Pre-attached tape
Pros
- Affordable price for budget projects
- Easy to install with pre-attached tape
- Lightweight and easy to handle
- Provides cushion and sound dampening
Cons
- Not very sticky so seams may shift
- Fragile if not handled carefully
- Comes without printed instructions
Bestlaminate 3in1 is the budget underlayment I used when money mattered more than maximum performance. At around $28 per 100 sq ft roll, it is one of the most affordable options on the market, and it covers the basics: foam cushioning, a built-in vapor barrier, and pre-attached seam tape. For a rental property refresh or a quick flip, this is hard to beat on price.
I installed this in a 90 sq ft laundry room over a concrete slab. It went down in about 15 minutes, the pre-attached tape stuck well enough for the seams to hold during plank installation, and the floor feels solid underfoot. The 3-in-1 construction (foam + vapor barrier + overlap) means I did not need to buy a separate 6 mil poly sheet.
The biggest issue with this product is the tape. The pre-attached adhesive strip is not very sticky, and during install, I had a few seams drift apart when I walked on the foam while laying planks. The fix is straightforward: keep a roll of standard underlayment seam tape on hand and reinforce the factory seams. Total added cost is minimal, but it is worth knowing before you start.
The other quirk is the lack of printed instructions in the box. The product page has the basics, and the installation is intuitive for anyone who has installed underlayment before. First-timers may want to watch a quick YouTube video or read a flooring forum post before starting. At 2mm thick, this is also thinner than mid-range options, so any subfloor imperfections will telegraph through.
When budget underlayment makes sense
Budget foam underlayment works fine for low-traffic rooms, rental properties, and projects where you plan to replace the floor within 5-10 years. The savings per project can be $50 to $150, which adds up across multiple rooms.
It is also a reasonable choice for above-grade installations over wood subfloors where moisture is not a major concern and foot traffic is light. Bedrooms that get occasional use and guest rooms are perfect applications.
Who should buy this
Anyone on a strict budget, DIYers tackling their first flooring project, and landlords outfitting rental units should start here. Just plan to add a roll of seam tape and accept that the underlayment is a basic, no-frills option.
For primary residences, high-traffic areas, or any basement installation, I would upgrade to a denser underlayment with a more reliable moisture barrier.
8. ROBERTS 70-115 Moisture Barricade Film – Best Vapor Barrier Only
ROBERTS 70-115 Moisture Barricade Underlayment Film, for Vinyl, Laminate SPC, Engineered Wood Floors, 6 mil. Thick, Polyethylene, 120 Sq. Foot Roll, Black
6 mil polyethylene
120 sq ft roll
Pure vapor barrier
Pros
- Pure 6 mil vapor barrier exceeds NWFA standards
- Lies flat without bunching or shifting
- Easy to roll out and cut
- Professional-grade at 40% less than big box
- Includes adhesive strip for seam sealing
Cons
- Vapor barrier only
- no cushioning or sound
- Must be combined with foam or felt underlayment
ROBERTS 70-115 is not really an underlayment in the traditional sense. It is a 6 mil polyethylene vapor barrier, the kind you install over concrete before any foam or felt underlayment. I keep a roll of this in my shop for any project where moisture is the primary concern and I want the strongest possible vapor seal.
Many of the underlayments on this list include a built-in moisture film. For most installations, that built-in film is sufficient. But for basements with known moisture issues, below-grade concrete that sweats during humid months, or any project where the manufacturer specifically calls out a 6 mil vapor barrier, this standalone product is the right call.
The 6 mil thickness exceeds the National Wood Flooring Association (NWFA) requirements for moisture barriers under wood flooring. The polyethylene lies flat without bunching, which is more than I can say for some thinner films I have used. The included adhesive strip seals the seams cleanly, and I have never had a moisture failure when using this product as the vapor layer.
The catch is that this is a vapor barrier only. It does not provide cushioning, sound dampening, or subfloor leveling. You need to install a separate foam or felt underlayment on top. That adds cost and complexity, but for moisture-critical installations, the belt-and-suspenders approach is worth it.
When to combine a vapor barrier with underlayment
If your flooring manufacturer specifies a 6 mil vapor barrier AND a separate underlayment, that is exactly what you need to install. Some higher-end engineered hardwood lines require this two-layer approach for warranty compliance.
For basements with documented moisture readings above 3 lbs per 1000 sq ft per 24 hours (calcium chloride test), a dedicated vapor barrier is non-negotiable. Built-in films on foam underlayments may not be thick enough.
Who should buy this
Anyone installing over concrete with known vapor transmission problems should add this to their project, either standalone or layered under a foam underlayment. It is also the right pick when the flooring manufacturer’s warranty requires a 6 mil vapor barrier.
If you are installing over a wood subfloor above grade and your underlayment already includes a moisture film, you can skip this product.
Buying Guide: How to Choose the Best Floor Underlayment?
Picking the best floor underlayment comes down to four factors: your flooring type, subfloor material, moisture conditions, and noise requirements. Get those right and any of the eight products above will perform well.
Match underlayment to flooring type
Laminate and engineered hardwood need firm, dense underlayment that resists compression. Standard QuietWalk, Roberts Black Jack, and Floorlot GoldMax are all appropriate. Luxury vinyl plank, SPC, and WPC need underlayment engineered for those specific products. Using a too-soft foam under LVP can cause click-lock failures.
Solid hardwood is typically nailed down rather than floated, so underlayment is usually a thin rosin paper or felt rather than a foam or fiber product. This guide focuses on floating floor installations.
Subfloor considerations
Concrete subfloors require a moisture barrier. Either choose an underlayment with a built-in film (Floorlot GoldMax, QuietWalk, QuietWalk LV) or pair a foam underlayment with a separate 6 mil poly sheet (Roberts 70-115 plus foam). Wood subfloors above grade typically do not need a dedicated vapor barrier, but the built-in film on products like QuietWalk does not hurt.
For subfloors with minor imperfections (3/16 inch variation over 10 feet), a 3mm underlayment helps smooth things out. For more significant unevenness, fix the subfloor with a leveling compound before installing underlayment.
Understanding IIC and STC ratings
IIC (Impact Insulation Class) measures how well a floor assembly blocks impact noise like footsteps and dropped objects. Higher numbers mean less noise transmission. STC (Sound Transmission Class) measures airborne sound like voices and music. Both ratings matter in multi-family housing.
For most single-family homes, IIC 55+ and STC 50+ are comfortable. For condos and HOA-regulated installations, many associations require IIC 60+ and STC 55+. Roberts Black Jack (IIC 70, STC 66) and Floorlot GoldMax exceed typical HOA requirements.
Thickness matters, but bigger is not always better
Most laminate and engineered hardwood installations work best with 2-3mm underlayment. Thicker padding can make the floor feel spongy, cause click-lock systems to flex under heavy furniture, and create transitions at doorways. Luxury vinyl plank specifically needs thinner, denser underlayment (often under 2mm) to avoid click-lock failures.
For upstairs rooms where noise reduction is the top priority, 6mm wood fiber underlayment like STEICO is the exception that proves the rule. The higher density of wood fiber allows thicker construction without the spongy feel of thick foam.
Installation tips from my projects
Always acclimate your underlayment and flooring in the installation room for 48 hours before starting. Subfloor must be clean, dry, and level. Roll out underlayment perpendicular to the direction you plan to install flooring planks. Tape all seams, even if the underlayment has a factory overlap. Leave a quarter-inch gap around the perimeter for expansion.
Do not overlap underlayment pieces. Overlaps create raised seams that telegraph through to the floor surface. Butt the edges together and tape them.
Frequently Asked Questions
What is the best floor underlayment thickness?
For most laminate and engineered hardwood installations, 2-3mm is the sweet spot. Anything thicker than 3mm with foam or felt can cause the floor to feel spongy and may stress click-lock joints. Luxury vinyl plank typically wants underlayment at 1.5-2mm. For upstairs noise reduction, 6mm wood fiber underlayment like STEICO is the exception that delivers thickness without sponginess.
How do I choose the right underlayment?
Start with your flooring type. Laminate and engineered hardwood need firm 2-3mm recycled fiber or foam. Luxury vinyl plank needs thin, dense underlayment designed specifically for rigid core flooring. Next, check your subfloor. Concrete requires a built-in or separate moisture barrier. Wood subfloors above grade are more forgiving. Finally, consider noise requirements. For upstairs rooms or multi-family housing, look for IIC 60+ and STC 55+ ratings.
What type of underlayment is best for concrete floors?
For concrete subfloors, choose underlayment with a built-in moisture barrier like Floorlot GoldMax, QuietWalk, or QuietWalk LV. These products combine foam cushioning with a vapor-blocking film in one layer. For basements with known moisture issues, layer a 6 mil polyethylene vapor barrier (Roberts 70-115) under a separate foam underlayment for maximum protection. Always run a moisture test on the slab before installation.
What is the best thing to put under vinyl flooring?
For luxury vinyl plank (LVP), SPC, and WPC flooring, choose a thin, dense underlayment specifically engineered for rigid core flooring. QuietWalk LV is the best dedicated LVP underlayment in this roundup. General-purpose foam underlayment is often too soft for LVP and can cause click-lock failures over time. If your LVP has a pre-attached pad, you typically do not need additional underlayment at all, but you may still want a vapor barrier over concrete.
Final Verdict: Which Floor Underlayment Should You Buy?
After installing all eight of these underlayments across different rooms and subfloors, my top pick for most homeowners is the QuietWalk 360 sq ft underlayment. It strikes the right balance between sound dampening, moisture protection, compression resistance, and ease of installation, and it works for laminate, engineered hardwood, and even LVP when paired with the QuietWalk LV variant.
For budget-focused projects, Bestlaminate 3in1 covers the basics at a fraction of the price, just plan to reinforce the seams with extra tape. For concrete subfloors and basement installations, Floorlot GoldMax is the right call thanks to its built-in moisture film and IIC/STC ratings. For upstairs rooms where noise is the top concern, STEICO Wood Fiber is worth the premium for its Delta IIC sound dampening.
The best floor underlayment is the one that matches your specific flooring, subfloor, and performance priorities. Use this guide to pick the right product for your project, and your new floor will look better, feel better, and last longer than one installed over a generic foam pad.