Mapeproof FBT system must be used together with other accessory products to guarantee the watertightness of all construction details that are typically found on a construction site. The products used in the system are as follows:

• Mapeproof FBT Tape 600, adhesive tape to form particular features over the top of adjacent sheets Mapeproof FBT, Mapeproof AL and Mapeproof SA
• Mapeproof SA Tape, adhesive tape to form sealed joints under adjacent sheets
• Mapeproof BA Tape watertight, double-sided adhesive sheet membrane to treat particular features and critical areas
• Mapeproof Fix Tape, double-sided adhesive fixing

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• Features & Benefits
• Application
• Limitations

Features & Benefits

• Waterproofing horizontal and vertical surfaces of underground structures before pouring concrete such as:
  • Carparks and garages
  • Underground areas in general
  • Swimming pools, basins and storage tanks
  • Underpasses
  • May be applied underneath foundation slabs and against diaphragms, pile walls, sheet piling and other retaining structures for excavation work
• Made up of a synthetic membrane, laminated with non-woven polypropylene fabric which, once concrete has been poured, forms a monolithic bond with the concrete and remains perfectly bonded over time
• Becomes fully bonded to poured concrete and prevents water from migrating laterally between the foundation structure and the membrane
• Completely watertight overlaps
• Cold-applied and no heat and/or naked flames are required
• Positioned before placing the steel reinforcement and pouring the concrete and does not require a protective layer
• Easy to install, extremely flexible and is easy to shape during installation so that it follows the form and geometry of the substrate
• Resistant to natural agents and aggressive substances normally found in groundwater and in the soil
• Highly durable and resistant to ageing from UV rays while normal site activities are being carried oout
• Forms a highly effective barrier against groundwater, moisture in the ground, radon and methane
• Complies with the requirements of the EN 13967 standard (“Flexible sheets for waterproofing – Plastic and rubber damp proof sheets including plastic and rubber basement tanking sheet”).

Application

Substrates must be sound and stable and may also be damp, but there must be no standing water. The surfaces on which Mapeproof FBT is to be applied must be even and have no large protruding areas or hollows. Substrates suitable for applying Mapeproof FBT include concrete, rigid insulating panels and wooden panels.

Horizontal Surfaces

Pour concrete on the ground to create an even layer on which to apply the membrane. Place Mapeproof FBT over the horizontal surface and run it up along the side walls to form a strip wider than the thickness of the foundation slab. Overlap the sheets lengthways so that the self-adhesive edges hold them in place. Use Mapeproof FBT Tape 600 and also Mapeproof SA Tape to join the ends between each sheet.

Before placing the steel reinforcement and pouring the concrete, make sure all the joints are well bonded. If any of the joints are poorly bonded, apply more Mapeproof FBT Tape 600 to form a better bond.

Vertical Retaining Walls Prior to Pouring Concrete

Before applying the sheets against diaphragms or piles, hydro-blast the surfaces and level off the installation bed and the ends of the tie-rods, which should not be too rough or have large hollows, with Mapegrout T60 fibre-reinforced, controlled-shrinkage, sulphate-resistant, thixotropic mortar for restoring concrete admixed with 0.25% of Mapecure SRA. When applying the sheets against piles, these only need to be carefully hydro-blasted.

Then waterproof the side walls by applying Mapeproof FBT, starting from the top of the walls and working downwards until it joints with the strip at the bottom of the walls, applied before pouring the foundation slab. Once the waterproofing system has been installed, check the overlaps and joints before pouring the concrete to make sure they are all well bonded. If any of them are poorly bonded, apply more Mapeproof FBT Tape 600 to form a better bond.

Between each pour of concrete, the construction joint that forms must be sealed with Idrostop, hydro-expanding acrylic profile to be placed at the midpoint of the construction joint.

Limitations

• Do not apply Mapeproof FBT if there is water or standing water
• If Mapeproof FBT is accidentally damaged while carrying out normal site activities, repair the damaged area by inserting an off-cut of the sheet, sealed with Mapeproof FBT Tape 600
• Concrete must be poured over Mapeproof FBT within 50 days (40 in hot weather) of application
• When Mapeproof FBT is applied prior to pouring concrete inside formworks, it is only possible to remove the formworks when the concrete reaches a compressive strength of 10 N/mm²
• In case of accidental accumulation of dust, sand and mud on the adhesive surface of Mapeproof FBT, perform a surface washing with water jets to ensure correct bond to the subsequently poured concrete