Sika®-1 Mortar Waterproofing System

BBA Certificate No 00/3761 Product Sheet 2

Materials:

Sika®-1 Pre-bag Spritz Mortar

Sika®-1 Pre-bag Render Mortar

Sika®-1 Pre-bag Finishing Mortar

Sika®-1 Pre-bag Screed Mortar

Walls:

Sika®-1 Mortar Waterproofing System for walls consisting of 3 coats as follows:

• 1st coat Sika Spritz Mortar @ 6mm
• 2nd coat Sika Render Mortar @ 6mm
• 3rd coat Sika Finishing Mortar @ 6mm

Total System Thickness – minimum 18mm.

Additional coats of Sika Render Mortar can be applied if necessary.

Floors:

Sika®-1 Mortar Waterproofing System for floors consisting of 3 coats as follows:

• 1st coat Sika Spritz Mortar applied as a bonding slurry
• 2nd coat Sika Spritz Mortar at 10 mm
• 3rd coat Sika Screed Mortar at 20 mm

Total System Thickness – minimum 30mm

All the above are minimum thickness, maximum thickness depends on substrate, working conditions and requirements.

Loading conditions may require the screed mortar thickness to be increased.

6 months from date of production

Sika®-1 Mortar Waterproofing System Pre-bagged mortars must be stored in dry condition at temperatures between +10°C and +30°C

The substrate must be structural sound and generally brickwork, dense concrete block and concrete normally provide satisfactory substrates. All surfaces should be clean and free from surface contaminants and laitance to achieve an adequate bond.

Walls/Brick:
All existing treatments shall be completely removed and the exposed surfaces roughened by mechanical or water blasting techniques, followed by washing down and brushing to ensure full removal of all loose material. Mortar joints should be bonded and sound.
Any defective mortar joint should be raked out to a depth of 12.0mm and repointed using Sika Finishing Mortar made up with clean water.

Walls/Concrete:
All laitance shall be removed to expose coarse aggregate by mechanical or water blasting techniques.
On new concrete walls SikaCem^® Desactivant^® 4-6 Concrete Retarder or similar can be applied to the face of the shuttering followed by wire brushing and washing of concrete surfaces.

Floors/General:
All existing treatments shall be completely removed and the exposed concrete floor mechanically prepared, washed down and brushed to ensure full removal of all loose debris to give an exposed aggregate finish, free of laitance, and surface contamination

Place a the correct amount of clean water into a mixer and add the mortar and mix until for water has been evenly dispersed, approximate 3 minutes. The Sika®-1 Mortar Waterproofing System mortars should be mechanically mixed using a forced action mixer or drill and paddle mixer to limit the amount of air entrapment. A tumble mixer is not suitable for mixing.

Ensure the substrate is structurally sound before installing Sika®-1 Mortar Waterproofing System. Consideration must be made to the affects of applying a render/screed system to the existing structure.

Immediately prior to application the substrate must be soaked with clean water however no standing water or puddles should be present.

Walls:

First coat – Sika Spritz Mortar applied as a 6 mm spritz coat by casting on vigorously over the complete wall surface.

Second coat – Sika Render Mortar applied by trowel at 6 mm as soon as the first coat has stiffened sufficiently (typically 4-5 hours later), with a coved trowel used at internal corners. A splatter coat of Sika Render Mortar or Sika Spritz Mortar is then applied to serve as a key for the third coat.

Third coat – Sika Finishing Mortar applied by trowel at 6 mm, finished with a wooden float to achieve a closed surface with neat arrises.

Should additional coats be required, Sika Render Mortar is repeated on the second day and subsequent days before the application of the Sika Finishing Mortar final coat.

Decorative Finishes

Refer to Architectural and Engineering Considerations.

Floors:

First coat – Sika Spritz Mortar is applied as a bonding coat in sections by vigorously working into the surface using a stiff brush or broom.

Second coat – Sika Spritz Mortar is applied by trowel by waiting for the mortar to become a plastic consistency. This coat is laid whilst the first coat is still wet at a minimum overall thickness of 10 mm.

Third coat – When second coat has hardened sufficiently to walk on, apply the third coat. Sika Screeding Mortar is prepared to a semi-dry consistency and is applied in a coat of 20 mm minimum thickness whilst the previous coat is still green. Tamp vigorously, until moisture rises to the surface and finish off with a wooden float to achieve a flat, closed surface or to achieve a surface finish to suit the final floor covering. If the third coat exceeds second coat by more than 24 hours, apply another bonding coat of Sika Spritz Mortar.

Corner Fillet – Use Sika Render Mortar to form any optional cornet fillets.

FORMATION OF LAP JOINTS:
When applying Sika®-1 Mortar Waterproofing System, successive coats must be lapped to eliminate a continuous butt joint through the mortar. The joints between successive coats of render and screed at day work joints must be stepped back to allow overlaps of a minimum 100 mm in length between coats. Before continuing with the new work the lap must be prepared by brushing and priming with a bonding coat of Sika Spritz Mortar.

Sika®-1 Mortar Waterproofing System must be kept moist during the work period and for a minimum 7 day period after final application to stop drying out and reduce cracking. Surfaces should be prevented from being exposed to sudden changes in air temperature, air movment and relative humidity.