PREPRUFE® SCS

Product Description

PREPRUFE® SCS is a unique blindside waterproofing system specifically developed to provide a high performance waterproofing solution for shotcrete foundation walls. The waterproofing system consists of the following:

• Preprufe SCS Membrane consisting of a polymer mesh-reinforced cavity backed by a plastic film facing the soil retention system, and faced with a non-woven, semi-permeable geotextile acting as a shotcrete barrier while allowing grout to bond to the shotcrete.

• Preprufe SCS Grout Injection Ports installed prior to shotcrete placement to facilitate hydrophilic grout injection.

• Preprufe SCS Hydrophilic Grout post-injected under pressure into composite sheet through injection ports left protruding through the shotcrete. The shotcrete side of the membrane enables grout to bond with shotcrete across the permeable geotextile.

The Preprufe SCS Composite Sheet Membrane is applied vertically to timber lagging or other soil retention systems. Shotcrete is then placed directly against the geotextile side of the membrane. Unlike conventional waterproofing systems, Preprufe SCS waterproofing system has injection ports to facilitate grout injection into a pre-created cavity space, forming an in-situ monolithic grout membrane with uniform thickness. After shotcrete placement, injection of the specially formulated Preprufe SCS Hydrophilic Grout fills and seals the system, thus providing ultimate waterproofing protection. All components of the specially developed Preprufe SCS System work together to form a continuous and integral bond to the structure, eliminating lateral water migration between the membrane and the shotcrete. When properly installed and grouted, the Preprufe SCS System will protect against water ingression.

The Preprufe SCS System is intended to be installed by trained applicators only. For a list of trained applicators, please contact your GCP representative. All Preprufe SCS System materials shall be supplied by GCP Applied Technologies, and applied strictly in accordance with their instructions. Refer to the Preprufe SCS waterproofing systems installation manual for detailed application instructions.

Substrate Preparation

It is essential to create a sound and solid substrate to eliminate movement during the shotcrete placement. Substrates must be regular and smooth with no gaps or voids greater than 1/2 in. (12mm). Grout around all penetrations such as utility conduits, etc. for stability.

If necessary, apply plywood, rigid insulation, HYDRODUCT® 220 drainage composite or other approved facing to substrate to provide support to the membrane. Board systems such as timber lagging must be close butted to provide support and not more than 1/2 in. (12mm) out of alignment. For areas close to finished grade where steel soldier piles and wood lagging will be removed, install a protection layer of 1/2 in. (12mm) thick cementitious wall board centred over the steel soldier piles.

Apply Preprufe 300R membrane below all horizontal slabs and rafts (i.e. mud slabs) extending a minimum of 18 in. (457mm) beyond the top of slab and protect from over splash. Refer to the Preprufe 300R membrane product Information for more detailed installation instructions. If Preprufe 300R membrane will not be used below the slab, consult your local GCP representative.

Membrane Installation

The Preprufe SCS Membrane can be applied at temperatures of 40°F (4°C) or above. The membrane may be installed in any convenient length but is best installed vertically the full length of the soil retention system leaving an additional 12 in. (305mm) of membrane at the top to tie into the horizontal waterproofing when necessary. With the geotextile side facing towards the shotcrete placement, attach the membrane to the substrate with staples approved by GCP spaced at 24 to 36 in. (610 to 914mm) down the middle of the membrane. Ensure the plastic film extension and the underside of the succeeding sheet are clean, dry and free from contamination before attempting to overlap. Apply the Preprufe Detail Tape at the centre of the film extension. Overlap the seams 21/2 in. (64 mm) minimum with membrane and ensure the top piece of membrane has only the geotextile extension (not plastic film) on the top of the existing membrane. Remove the release liner from the Preprufe Detail Tape and roll the membrane firmly at the seam with a hand roller to ensure a good seal. Mechanically fasten the seam on the geotextile overlap with staples spaced at 12 to 18 in. (305 to 457mm).

Roll ends and cut edges—Place Preprufe CJ Tape under the membrane with adhesive side facing membrane, centred along ends/cut edges. Secure strip to the substrate by staples. Ensure the underside of membrane is clean, dry and free from contamination. Butt joint membrane and roll firmly at the seam with a hand roller to ensure a good seal. Apply Preprufe SCS Geotextile Strip centred over the butt joint and secure on the top and bottom of butt joint with staples at 12 to 18 in. (305 to 457mm) oc.

Penetrations

For Service Pipes, Rebar, All-Thread, Metal Dowels, etc. — follow these steps to seal around penetrations:

• Clean loose dust or dirt from the penetration and the surrounding substrate surface using a clean, dry cloth or brush. Remove rust, if applicable, with a wire brush and wipe clean.

• Cut the Preprufe SCS Membrane tight to within 1/2 in. (12mm) of the penetration. If the membrane is 1 in. (25mm) or more from the penetration, install a cut-to-fit “filler strip” of the membrane to cover the gap following the membrane repair guidelines until the membrane is within 1/2 in. (12mm) of the penetration.

• Apply Preprufe Hydrophilic Sealant to cover the gap and form a minimum 1/4 in. 6mm but no more than 1 in. (25mm) thick continuous fillet between the plastic film side of the membrane and the base of the penetration. Extend a 90 mil (2.2mm) continuous coating of sealant onto the surface of the membrane overlapping a minimum of 1 in. (25mm).

Tiebacks

Prior to membrane installation, fasten Preprufe Tieback Cover ABS base to the substrate to cover the tieback. Apply the Preprufe Detail Tape around the outside edge of the ABS base. Install the Preprufe SCS Membrane over the ABS base and then cut out the membrane 1/2 in. to 1 in. (12mm to 25mm) around the dome hemisphere. Remove the release paper on the Preprufe Detail Tape and press the membrane firmly to the ABS base. Roll the membrane firmly at the joint with a hand roller to ensure a good seal. Position Preprufe Tieback Cover on top of the ABS base and mechanically fasten the Preprufe dome. Apply Preprufe Tape (LT or HC) over the top edge of the tieback cover.

Terminations

Position Preprufe CJ Tape under the membrane along the termination, centred along the membrane cut edges/roll ends. Secure half of the tape under the membrane to the substrate with staples. Press the membrane firmly onto the tape and fold over the membrane. Roll the folding area with a hand roller to ensure a good seal. Remove the release paper. Mechanically fasten by staples at 12 in. (305mm) oc along the top edge of the CJ tape.

Safety

Preprufe SCS Hydrophilic Grout products must be handled properly. Refer to product label and Material Safety Data Sheet before use. All users should acquaint themselves with this information prior to working with the material. Users must be aware that the equipment used for the Preprufe SCS Waterproofing System operates under pressure. Only trained individuals should operate this equipment. Installation personnel should utilise all necessary personal protective gear.

General Guidelines

Preprufe SCS Hydrophilic Grout can be injected into the Preprufe SCS membrane a minimum of seven days to a maximum of 6 months after the shotcrete placement. This minimum wait period allows the shotcrete to gain sufficient compressive strength. A minimum concrete compressive strength of 1500 psi (10N /mm²) is recommended prior to grout injection.

Port Preparation

Cut the tubing flush to the shotcrete surface and install the Preprufe SCS Injection Packer into the tubing. Allow all water to gravity drain from the bottom “drainage ports” prior to installing the packer. Tighten packers using a ratchet, electric drill fitted with a socket, or open-end wrench by turning clockwise until firm and secure. Packers are supplied with a one-way check valve to minimise back flow during the injection procedure. If the installed injection ports are not provided at intervals that will ensure full depth penetration as specified, drill additional holes through the shotcrete but not the membrane. Press grouting packers fitted with sleeves into the drilled holes until secure.

Environmental Conditions

Precautions

Prior to application, a local GCP representative should be consulted to verify that site conditions are appropriate for the Preprufe SCS System.

The Preprufe SCS System includes injection of grout at high pressures. The Project Structural Engineer should evaluate the site for potential affects on adjacent building elements. Injection has the potential to cause hidden damage if installed incorrectly.

Limitations

Low temperatures will significantly elongate set times. Bring product up to a minimum temperature of 50ºF for a minimum period of 24 hours prior to use. If site temperatures are extremely low, material should be held in a warm area before and during use to maintain the product’s temperature. Allow no water into open containers. DO NOT EXCEED 90ºF WHEN WARMING. (CAUTION - pH NOTICE. Water used on site to activate grouts must be in a range of pH 5.5 to 7 for optimum grout quality. Varying water pH will cause the reaction times to change. Test ground water for pH and consult with the manufacturer to ensure the pH falls within the threshold limitations.)