







Mapei Mapeguard UM 35 Uncoupling Membrane 30m
PRODUCT DETAILS
Mapei Mapeguard UM 35
Waterproofing, uncoupling and anti-fracture membrane for cracked/damp or not-fully-cured substrates before installing ceramic and stone tiles (internal & external).
Key benefits
- Waterproof membrane to help protect substrates from water infiltration
- Uncoupling layeruto help reduce stress transfer from the substrate to the tiled finish
- Anti-fracture performance to help manage cracks in the substrate
- Vapour compensation channels to allow moisture in underlying layers to release
- Suitable for balconies/terraces, bathrooms, and overlaying existing flooring
- Semitransparent for easier checks of adhesive coverage and cutting around penetrations
- Helps distribute heat more evenly over heated floors
Technical details
(Typical values — match to your SKU/roll size on the product)
| Product type | Waterproofing / uncoupling / anti-fracture membrane |
| Construction | Honeycomb HDPE layer (rough surface) with polypropylene fabric backing |
| Colour | Blue |
| Roll sizes (packaging) | 5 m × 1 m and 30 m × 1 m rolls (range packaging) |
| Suitable tile types | Ceramic and stone tiles (incl. overlays onto existing flooring) |
| Minimum tile size | Do not use tiles smaller than 5 × 5 cm |
| Substrate crack limit (guidance) | Do not apply over cracks/joints with out-of-plane movement or cracks wider than 3 mm |
| Robinson Wheel rating | ASTM C 627 — Extra Heavy Commercial Rating (per TCNA test report) |
| Pull-out strength (typical) | EN 12004 — 0.6 N/mm² (+0.1 / −0.2) |
Where it works best
- Balconies & terraces (waterproofing + uncoupling + vapour compensation)
- Bathrooms and wet areas (use correct joint/edge sealing method for full waterproofing)
- Renovations and overlays onto existing floors (ceramic/resin/wood — where suitable)
- Heated floors (helps even heat distribution)
Important notes
- Do not use over structural joints or where movement is expected.
- Membrane must be covered with ceramic/stone flooring.
- Follow the recommended system components for sealing seams/edges in wet or external areas.
DELIVERY & RETURN
Delivery
We only deliver to UK Mainland and Highlands areas only. We do not deliver products to the Islands, Ireland, or Northern Ireland.
Sample Order
All sample orders are shipped for FREE (no shipping cost occurs).
Free Shipping
Minimum order value £450 inc VAT qualify for free shipping (excluding Large slabs).
Order Cut-Off Time
Orders placed before 12:00pm will be delivered by the next working day (subject to stock availability). Next working days exclude weekends and holidays.
No Next Working Day Delivery - Scotland
We are unable to offer next-day service to the following postcode regions in Scotland: AB, IV, KW, PA.
Shipping Cost for Orders Under £450 (inc VAT)
Shipping costs are determined by the product's weight and your shipping location. To view the exact shipping cost, enter your postcode on the shopping cart or checkout page.
Shipping Services
- APC Overnight (A2Z Shipping): Next working day - for under 50kg parcels.
- DPD: Next working day - for under 50kg parcels.
- Next Working Day: From £6.50 + VAT
- Economy Service: 2-3 Working Days (Only for order weight over 50kg)
Orders Over 50kg (Pallet Service)
Large orders over 50kg will be delivered on a pallet (small, half, or full pallet). All pallet deliveries will be made via curbside delivery only.
Shipping Services for Pallet
- Palletways: Next working day - Over 50kg order (semi, half, or full pallet).
- K & R Mason: Next working day - Over 50kg order (semi, half, or full pallet).
Returns & Refunds
30-Day Return Policy: Request a return within 30 days of receiving your order.
Restocking Fees
All RAK products are subject to a restocking fee, contact for more informations.
Return Conditions
Items must be unused, with tags, in original packaging, and include proof of purchase.
Start a Return
Email us at sales@bathroomtiles.uk to begin the process.
Return Address
Bathroom Tiles
108 Beddington Lane,
London, CR0 4YY, UK
Return Approval
Returns must be approved before sending items back.
Damaged or Wrong Items?
Contact us immediately upon delivery for help.
Non-Returnable Items
Includes sale items, gift cards, custom products, and hazardous materials.
Exchanges
Return your item and place a new order for the replacement.
Refunds
Issued within 10 business days after return approval and inspection.
Need Help?
Contact us anytime at sales@bathroomtiles.uk.

Mapei Mapeguard UM 35 Uncoupling Membrane 30m
£230.00