Does SPC Flooring Need Underlayment?
Underlayment plays an important role in many flooring systems, but when it comes to SPC flooring, the requirement depends on the product design and installation conditions. This guide explains when underlayment is needed, when it is not, and how it affects SPC flooring performance.
Short Answer
SPC flooring does not always need separate underlayment. Many SPC products come with an attached underlay that already provides cushioning, sound reduction, and minor subfloor compensation.
When Underlayment Is NOT Required
Underlayment is generally not required in the following situations:
- SPC flooring has a factory-attached backing
- Subfloor is smooth, flat, and clean
- Installation area does not require extra sound insulation
When Underlayment IS Recommended
1. For Sound Reduction
In apartments, offices, or multi-storey buildings, underlayment helps reduce footstep noise and impact sound transmission.
2. For Minor Subfloor Imperfections
Underlayment can help smooth out very small surface variations, improving plank locking and comfort underfoot.
3. For Moisture Protection
In areas where moisture vapour may rise from the subfloor, a moisture barrier underlayment adds extra protection.
4. For Comfort Enhancement
Some users prefer additional cushioning, especially in spaces where standing for long periods is common.
Types of Underlayment Used with SPC Flooring
- Acoustic underlayment for noise reduction
- Foam underlayment for basic cushioning
- Moisture barrier underlayment for concrete subfloors
Important Things to Know Before Using Underlayment
- Do not double-layer underlayment if SPC already has attached backing
- Too much cushioning can damage click-lock joints
- Always follow product-specific installation guidelines
SPC Flooring with Attached Underlay vs Separate Underlayment
SPC flooring with attached underlay offers convenience and consistent performance. Separate underlayment allows custom sound or moisture control but must be chosen carefully to avoid compatibility issues.
Installation Tips for Best Performance
- Ensure the subfloor is clean and level
- Use only recommended underlayment thickness
- Maintain proper expansion gaps
- Avoid overlapping underlayment sheets
Frequently Asked Questions (FAQ)
1. Can SPC flooring be installed without underlayment?
Yes, especially if it includes an attached backing and the subfloor is well prepared.
2. Is underlayment mandatory for SPC flooring?
No, it depends on the product and installation requirements.
3. Can I use laminate underlayment with SPC?
Only if it is approved for SPC flooring and meets thickness requirements.
4. Does underlayment improve waterproofing?
Underlayment can add moisture protection, but waterproofing comes from the SPC core.
5. What happens if the wrong underlayment is used?
It may cause joint failure, noise, or void the product warranty.
Raltro
Raltro is a material guidance platform that explains flooring system compatibility and installation behaviour. For SPC flooring, it helps users understand when underlayment is beneficial, how it affects performance, and how to choose the right solution for different environments.