SPC Flooring Underlayment Guide EPE vs Foam vs No Underlayment 2024
SPC flooring with attached IXPE pad does not need additional underlayment. The pad is built into the plank during production and provides sufficient sound reduction and comfort. Adding extra underlayment under pre-attached SPC can cause the locking system to fail.
For SPC flooring without attached pad, you need underlayment. There are two common types.
EPE Polyethylene Foam
EPE is the most common underlayment for SPC flooring. It is inexpensive and widely available. EPE comes in rolls of 1mm to 3mm thickness. It provides basic sound reduction and some moisture resistance.
The problem with EPE is quality varies widely. Low density EPE compresses over time and loses its cushioning effect. Some EPE has poor closed cell structure and absorbs moisture instead of blocking it. Thick EPE over 2mm can cause the SPC locking system to flex and fail. Use thin EPE only 1mm to 2mm and check the density by pressing it with your finger. High density EPE resists compression. Low density EPE leaves a permanent dent.
Foam Underlayment
Foam underlayment is softer than EPE and provides better sound reduction. It is more comfortable underfoot. The problem is foam is too soft for SPC flooring in most cases. SPC is a rigid product that requires a firm base. Soft foam allows the planks to flex when you walk. This flexing puts stress on the locking joints.
Foam underlayment over 3mm thick is not recommended for SPC. If you use foam, choose the thinnest option available, ideally 1mm. Foam does not provide any moisture protection. You must always use a vapor barrier with foam underlayment on concrete subfloors.
No Underlayment on Concrete
Some SPC products can be installed directly on concrete without underlayment if the concrete is flat and dry. This is only recommended for SPC with attached pad. Without attached pad, direct concrete installation produces noise and feels hard underfoot. It also increases the chance of moisture issues because there is nothing between the concrete and the plank.
You Need a Vapor Barrier
Regardless of underlayment type, concrete subfloors require a vapor barrier of at least 0.15mm polyethylene film. The vapor barrier goes directly on the concrete. Underlayment goes on top of the vapor barrier. Without a vapor barrier, moisture from the concrete will eventually reach your flooring whether you use EPE or foam.
Summary Chart
EPE
- Best for: SPC without attached pad, budget option
- Thickness: 1mm to 2mm
- Sound reduction: Moderate
- Moisture protection: Partial, needs vapor barrier
- Risk: Low density EPE compresses, thick EPE damages locks
Foam
- Best for: Sound insulation priority, light traffic areas
- Thickness: 1mm to 2mm maximum
- Sound reduction: Good
- Moisture protection: None, must use vapor barrier
- Risk: Too soft for SPC lock system, use only thin
No Underlayment
- Best for: SPC with attached pad on flat dry subfloor
- Sound reduction: Poor
- Moisture protection: Needs vapor barrier
- Risk: Hard feel, noisy
About PROLEADER
PROLEADER SPC flooring is available with attached IXPE pad or without. Contact us for product specifications and underlayment recommendations for your specific installation conditions.
