mc expert construction waterproofing foil 5 x 20 m 0.3 mm

mc expert construction waterproofing foil 5 x 20 m 0.3 mm is a general-purpose polyethylene membrane intended for temporary and permanent moisture protection in building works. The roll measures 5 meters by 20 meters and has a nominal thickness of 0.3 mm, offering a continuous barrier against water penetration and vapor transmission. The product is lightweight and flexible, enabling straightforward on-site handling, cutting and placement around foundations, walls, floors and other structural elements where a reliable sheet membrane is required.

Advantages

The waterproofing foil forms an uninterrupted layer that reduces risk of capillary moisture and helps control dampness in construction assemblies. Its 0.3 mm thickness balances mechanical resistance with pliability, allowing easy adaptation to uneven surfaces and simple overlap joints. As a polyethylene sheet, it is chemically inert to common construction materials and resists tearing under normal installation conditions. The roll format simplifies storage and transport and enables rapid coverage of large areas.

Suitable for

• Vapor and water barrier under concrete slabs and screeds
• Damp-proofing of foundations and basement walls
• Temporary site covers and weather protection
• Separation layer between incompatible materials
• Floor underlayment in renovation and new build projects

Key specifications

• Material: polyethylene (LDPE/HDPE characteristics typical for construction foil)
• Nominal thickness: 0.3 mm
• Roll dimensions: 5 m width × 20 m length
• Form: continuous sheet membrane on a roll for cutting on site
• Properties: flexible, tear-resistant in normal handling, vapor- and water-blocking

How to use

Unroll the membrane on a clean, dry substrate and allow sufficient overlap at seams (typically 100–200 mm) to ensure continuity. Secure edges and overlaps with compatible tapes or mechanical fixings suited to the substrate and subsequent works. When used under concrete or screed, place the foil directly on compacted fill or a smooth sub-base to prevent punctures; protect from sharp aggregates during placement. For vertical applications, fasten the foil at the top and ensure proper sealing at junctions with walls, penetrations and drainage elements.

Usage recommendations

Store rolls flat in a dry area out of direct sunlight and avoid prolonged UV exposure. Inspect the membrane for punctures or damage before and after installation; repair small tears with compatible tape or replace damaged sections. Select jointing and fixing materials that are compatible with polyethylene and the intended construction sequence.