Preparing Your Subfloor: What Happens Before Resin Goes Down

The finished resin floor is what homeowners see and show off, but the work that determines how well it performs happens before a drop of resin is applied.

At Natural Stone Carpets, thorough subfloor preparation is what separates a resin floor that looks flawless for decades from one that develops problems within a few years.

Why Preparation Matters So Much for Resin

Because resin flooring is fully bonded to the subfloor beneath it, rather than simply laid on top, any weakness, moisture or unevenness will eventually show through the finished surface. Skipping or rushing preparation is the single biggest cause of resin floor failures, which is why this stage often takes as long as the resin application itself.

What the Assessment Stage Involves

• A full inspection of the existing floor, whether concrete, screed, tiles or timber

• Moisture testing, since excess moisture is a leading cause of resin adhesion failure

• Identifying cracks, movement joints or structural issues to address before work begins

• Checking floor levels, since resin is applied as a thin, self-levelling system

Common Preparation Steps

• Diamond grinding or shot blasting to remove existing coatings and create a surface the resin can properly bond to

• Crack repair and joint filling, so movement in the subfloor won't telegraph through

• Self-levelling compound application where floor levels vary

• Damp-proofing membranes in areas with elevated moisture readings

• Removal of existing tiles or timber where resin can't be applied directly over them

What This Means for Older Properties

Older Irish homes, particularly those without a modern damp-proof membrane, often need more extensive preparation than a newer build. This isn't a reason to avoid resin flooring, but it is something a reputable installer should identify and address upfront rather than skip in the interest of speed.

Why This Stage Is Worth the Time

It can be tempting to see subfloor preparation as time that could be trimmed, but it's the single biggest factor in how long a resin floor will last. A properly prepared subfloor is what allows us to offer the durability resin flooring is known for, and it's not a step we compromise on regardless of project size.

At Natural Stone Carpets, our site assessment process is designed to catch these issues before work begins, so your floor is built to last from the ground up.