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Moisture barriers · Roo pick

Schluter Kerdi membrane 108

Bonded waterproofing membrane for tile wet areas — set in thinset, not peel-and-stick adhesive SKUs.

~$235 on Amazon (approx.)
★ 4.8 approx.
  • Schluter Kerdi bonded waterproofing / vapor-retardant membrane for tile showers and wet areas
  • Installed in thinset mortar — not a peel-and-stick adhesive-backed product SKU
  • Pair with standard Ditra (thinset-set) for floors when your assembly needs both
  • Underyoo does not merchandise adhesives, primers-as-glue, or adhesive pails
Category
Moisture barriers
Use
Waterproofing under tile in wet areas (per Schluter handbook)
Coverage
About 108 sq ft (confirm listing size)
Not for
Standalone liquid adhesive · peel-stick adhesive SKUs as the product
Checkout
Amazon (live price & shipping)
Amazon ASIN
B003C6EQPE

Discover and decide here. Checkout, shipping, and returns on Amazon.

Signal from the field

Review snapshot

Rating ~4.8 approx. Confirm live reviews and options on Amazon.

Schluter Kerdi membrane 108: Bonded waterproofing membrane for tile wet areas — set in thinset, not peel-and-stick adhesive SKUs. Category-correct for moisture barrier — not a catch-all foam.

What people love

  • Schluter Kerdi bonded waterproofing / vapor-retardant membrane for tile showers and wet areas
  • Installed in thinset mortar — not a peel-and-stick adhesive-backed product SKU
  • Clear role in vapor or wet-area stacks
  • Pairs with underlay or tile systems when specified
  • Known brand families with install literature

Honest caveats

  • Wrong product class for the wrong problem (vapor vs liquid)
  • Seams and detailing matter as much as the sheet
  • Not a substitute for fixing bulk water intrusion

Best for

  • Slab or grade assemblies that require vapor control
  • Tile wet areas with proper membrane systems
  • Crawl or liner jobs when local practice calls for poly

Skip if

  • You only need a soft carpet pad
  • You are shopping liquid adhesives (we do not list those)
  • Your floor brand bans the material you picked

Item notes

Schluter Kerdi membrane 108: field notes before you buy

Bonded waterproofing membrane for tile wet areas — set in thinset, not peel-and-stick adhesive SKUs.

Vapor drive vs liquid leaks

Schluter Kerdi membrane 108 sits in the moisture barrier lane. Bonded waterproofing membrane for tile wet areas — set in thinset, not peel-and-stick adhesive SKUs. Shop it when that job matches your room — not as a generic foam for every problem under the roof.

When film is required

Expect the product to do the job on the listing: Bonded waterproofing membrane for tile wet areas — set in thinset, not peel-and-stick adhesive SKUs.

Notable trait: Schluter Kerdi bonded waterproofing / vapor-retardant membrane for tile showers and wet areas

Also in the mix: Installed in thinset mortar — not a peel-and-stick adhesive-backed product SKU

Live with it as a system — subfloor, finish, and traffic — not as a magic rectangle from a box.

Seams, overlaps, and common mistakes

Manufacturer instructions beat any web page, including this one.

On slabs, vapor rules and underlay thickness are where warranties live or die. On wood subfloors upstairs, the brand may want a different stack entirely.

Underyoo does not merchandise adhesives. If the install needs thinset or branded adhesive, that stays outside our catalog.

How this sits in a full stack

Practical checklist:

• Follow Schluter handbook for substrate prep and thinset type
• Seal seams with Kerdi-Band where required
• Do not treat Underyoo as a source for flooring adhesives

Discover and decide on Underyoo; confirm price, stock, and final specs on Amazon before you commit the room.

Before you open the pack

Setup tips

  • Follow Schluter handbook for substrate prep and thinset type
  • Seal seams with Kerdi-Band where required
  • Do not treat Underyoo as a source for flooring adhesives
Ready to buy?

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Buyer questions

FAQ

What is Schluter Kerdi membrane 108 used for?

Schluter Kerdi membrane 108 is in the moisture / vapor / wet-area membrane lane — poly films, uncoupling membranes, or waterproofing sheets depending on the SKU. It controls vapor or liquid water in assemblies when the system calls for it. It is not carpet pad and not a sleep topper.

Is a vapor barrier the same as waterproofing membrane?

Not always. Thin poly vapor retarder films manage vapor drive under floating floors or in crawlspaces. Tile wet-area membranes (for example Schluter-style sheets) are waterproofing and detailing systems set in thinset. Read the product class on the listing and match it to the problem (vapor vs liquid vs uncoupling).

Do I need a moisture barrier under LVP on a slab?

Many LVP brands require a vapor retarder on or below grade when the underlay does not already include one. Some underlays integrate film; some planks ban double vapor layers. Follow the flooring brand — Underyoo helps you find the barrier or underlay class, not rewrite the warranty.

Is this peel-and-stick adhesive underlayment?

Underyoo does not merchandise adhesives as products. Membrane SKUs in this room are sheet systems (often thinset-set or loose poly), not glue pails. Confirm install method on the Amazon listing.

Can I use this under wall-to-wall carpet?

Only if your carpet system specifically calls for a poly or membrane under the cushion. Most carpet jobs need carpet pad first; moisture film is a separate detail. Do not substitute a tile membrane for rebond cushion.

How do I seam a poly vapor barrier?

Overlap seams per the listing or local code (often several inches), tape with compatible seam tape, and run film up walls where the system requires. Wrinkles and gaps defeat the barrier. Manufacturer details beat generic advice.

Is the price on Underyoo final?

No. Prices and stock on Underyoo are approximate hints to help you compare. Amazon’s listing is the source of truth for live price, shipping, tax, and availability at checkout.

Does Underyoo sell adhesives, glues, or tape as products?

No. Underyoo merchandises what goes under floors, rugs, furniture, and sleep systems — underlayments, pads, membranes, support foam, and mattress toppers. We do not list glue pails, peel-and-stick adhesive underlay SKUs, or tape as primary products. If your install needs thinset or a brand-specified adhesive, that stays on the flooring manufacturer’s system.

Where do I buy and return this item?

Checkout, payment, shipping, and returns are handled on Amazon through the product or search link. Underyoo is a discovery and notes hub, not the retailer of record.

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Schluter Kerdi membrane 108 ~$235 approx.
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