Wondering if you need underlayment for vinyl flooring on plywood? In this article, we explain when it’s necessary, when you can skip it, and what type of underlayment works best to ensure a smooth and lasting floor installation.
What is an underlayment?
Underlayment is a thin layer placed between the subfloor (like plywood or concrete) and your finished flooring. It helps smooth minor imperfections, adds cushioning, reduces noise, and can act as a moisture barrier.
For vinyl plank flooring, underlayment improves comfort, durability, and stability, though some vinyl products come with built-in underlayment, making an extra layer unnecessary.
Do I need underlayment for vinyl flooring on plywood?
In most cases, you don’t need underlayment if your vinyl flooring has a pre-attached pad and your plywood subfloor is clean, dry, and level. However, if the subfloor has minor imperfections, or you want added sound insulation or moisture protection, a thin, compatible underlayment can be beneficial.
Always check your vinyl manufacturer's guidelines, some warranties may require or prohibit additional underlayment.
When you don’t need underlayment
You can skip underlayment if:
- Your vinyl flooring has pre-attached padding: Many luxury vinyl plank (LVP) products come with built-in underlayment for comfort and sound reduction.
- The plywood subfloor is smooth, dry, and level: If there are no major imperfections, a separate underlayment may be unnecessary.
- Manufacturer instructions say not to use it: Adding extra layers can interfere with the locking system or void your flooring warranty.
In these cases, installing directly over the plywood is usually safe and effective.
When underlayment is recommended or required
You should use underlayment if:
- Your vinyl flooring does not have pre-attached padding: A separate underlayment adds comfort, insulation, and sound absorption.
- The plywood subfloor has minor imperfections: Underlayment can help smooth out small gaps or uneven spots for a better finish.
- You need moisture protection: In areas like kitchens, basements, or bathrooms, a moisture barrier layer is important, especially over plywood prone to humidity.
- Sound reduction is a priority: For upper-level rooms or multi-family buildings, underlayment can significantly reduce footstep noise.
Always choose an underlayment that’s compatible with vinyl flooring and approved by the manufacturer.
What kind of underlayment do I need? Best underlayment options for plywood
For Concrete Subfloors
Use an underlayment with a built-in moisture barrier to prevent water damage and mold. Look for high-density foam or rubber products specifically designed for vinyl flooring over concrete.
For Plywood Subfloors
Choose a thin, firm underlayment like high-density foam or felt. Moisture protection is optional but helpful in humid areas. The goal is to smooth minor imperfections and reduce noise without compromising the vinyl’s locking system.
For Existing Flooring (Tile, Laminate, etc.)
If the surface is level and the vinyl has pre-attached padding, no extra underlayment may be needed. Otherwise, a thin foam layer can help with cushioning and sound absorption without raising floor height too much.
What is the best underlayment for vinyl plank flooring?
The best underlayment for vinyl plank flooring depends on your subfloor type, room conditions, and whether your vinyl planks have pre-attached padding. Here’s a breakdown of popular options and their benefits:
- Foam: Affordable and ideal for plywood subfloors. It offers basic cushioning but usually lacks a moisture barrier, so it’s not recommended for damp areas.
- Cork: Great for sound insulation and naturally resistant to mold and mildew. It’s also hypoallergenic, making it suitable for homes with allergy concerns.
- Felt: Provides excellent noise reduction and is often made from recycled materials. However, it offers minimal cushioning and isn’t moisture-resistant.
- Rubber: Durable, water-resistant, and offers superior sound and thermal insulation. It’s ideal for basements or high-traffic areas.
- Plywood or OSB (Oriented Strand Board): These structural underlayments are more rigid and moisture-resistant than particleboard. They help create a stable base, especially when leveling is needed.
- Particleboard: Low-cost but not moisture-resistant or long-lasting, so it’s rarely recommended beneath vinyl plank floors.
When choosing underlayment, consider the subfloor condition, moisture levels, and acoustic or thermal needs. If your vinyl flooring has pre-attached padding, additional underlayment may not be necessary and could even void the warranty. Always check the manufacturer’s recommendations before installation
How to Install Underlayment for Vinyl Plank Flooring
Step 1: Select the Right Underlayment
- Choose an underlayment designed for vinyl plank flooring. Key features to consider:
- Moisture barrier (especially for concrete or humid areas)
- Sound-reducing properties
- Firm, thin construction for stability with click-lock systems
Avoid using extra underlayment if your vinyl planks have pre-attached padding, this can cause movement and affect locking mechanisms.
Step 2: Prepare the Subfloor
- Clean thoroughly, remove all dust, debris, and residue.
- Check levelness, fill in low spots and sand down high areas.
- Ensure dryness and stability, a dry, solid surface is key for performance.
- A well-prepped subfloor helps prevent uneven planks and future flooring damage.
Step 3: Roll Out the Underlayment
- Roll out the material across the room in the direction of the planks.
- Leave a 1/8-inch gap along the perimeter to allow for expansion.
- Trim as needed using a utility knife to fit around corners and edges.
Step 4: Tape the Seams
- Lay the next row edge-to-edge without overlapping.
- Use underlayment tape to seal the seams and hold the material in place.
- Sealed seams help prevent shifting and enhance moisture protection.
Step 5: Begin Vinyl Plank Installation
Once your underlayment is fully installed and secure, start laying your vinyl plank flooring according to the product's instructions. Make sure each plank clicks into place firmly over the underlayment.
Installing underlayment for vinyl plank flooring isn’t just an extra step, it’s essential for maximizing your floor’s performance, comfort, and lifespan. Whether you're working over plywood, concrete, or existing flooring, choosing the right underlayment and installing it properly ensures better moisture resistance, noise reduction, and stability underfoot.
By following the correct process and manufacturer guidelines, you’ll set a solid foundation for a smooth, durable vinyl plank floor. For the best results, always pair your flooring with a high-quality underlayment suited to your space and subfloor type.
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