Multigum

Application

Multigum is used for sealing new concrete roofs, old bitumen sheets coated with aggregates, old acrylic coatings, old polyurethane coatings and metal roofs. Multigum is also used for coating and sealing external walls (Multigum matt version).

Technical spesifications

Instructions for use:

Surface preparation:

Check that gutters are in good working order, that walls and floor meeting corners are rounded, and verify minimum slopes of 2%.

For a new concrete roof:

Application should be performed on a stable, clean and dry concrete (not foamed concrete) that was casted minimum 30 days before application. Remove intensively all loose particles. Apply 250 gm/m² of Aquapoxy. Drying time:1-2 hours. In case of a porous concrete, apply additional layer of Aquapoxy in quantity of 150-200 gm/m² .Allow to dry 1-2 hours.

For a roof coated with old acrylic sealing product:

Remove intensively loose membrane parts. Rinse intensively the roof to remove the mud and wait until completely dry. Fill depressions deeper than 6mm with cement mortar, modified with acrylic polymer. Apply 200 gm/m² of Aquapoxy. Drying time: 1-2 hours.

For a roof coated with bitumen membranes covered by aggregate:

Remove loose aggregate particles off the roof. Rinse intensively the roof to remove the mud and wait until completely dry. Apply Aquapoxy at a quantity of 300 gm/m².Allow to dry for 1-2 hours.

For a metal roof (galvanized or paint coated):

Remove intensively all sediments and loose particles. Apply polyurethane mastic type BPU-2 at all overlap lines between two adjacent metal plates, over the joint between them and over all the screws. In case the open joints are long/wide, apply butyl tape coated with fleece, 15 cm width, along the joint. Apply Primer MS-1 at a quantity of 200 gm/m² over the metal surface. Wait 1-2 hours for drying prior to application of Multigum. In case of paint coated metal roof, it is highly recommended to apply first the waterproofing system on a small spot in order to verify the proper adhesion to the specific paint.    

For an old asbestos roofs:

Remove intensively all sediment and loose particles. Rinse intensively the roof to remove the mud and duckweed and wait until completely dry. Apply polyurethane mastic type BPU-2 at open overlap lines between two adjacent plates and over all the screws. Then, apply Primer MS-3 in a quantity of 300 gm/m². Allow to dry for 1-2 hours and then apply additional layer of Primer MS-3, 150-200 gm/m². Allow to dry 1-2 hours.

Performing of sealing layer:

1. Apply Multigum Blue in quantity of 1.0 kg/m² along the walls and floor meeting corners, gutters, pipe penetration and along cracks (in 15 cm strips). Let it dry for 2 - 4 hours.
2. Apply a first layer of Multigum Blue over the surfaces by spray or brush, in a quantity of 1 – 1.25 kg/m². Letting to dry for 3 -5 hours.
3. Apply 1 – 3 layers of Multigum White in a quantity of 1 – 1.25 kg/m².

Drying time between layers: 3 – 5 hours.

Total quantity: 2.5 – 4.5 kg/m², depends on slopes, type of substrate and dimensions of the roof.

For achieving a reliable and long lasting waterproofing system, It is recommended to reinforce the fresh Multigum Blue with polyester fabric type POLYFABRIC (a glass net is acceptable as a less qualified reinforcement). A minimum quantity of 4 kg/m² Multigum is recommended in this case.

 Apply Multigum White also over the parapets in quantity of 1.6 kg/m² - 0.8 kg/m² for each layer.

When using a brush for coating, the layers should be performed in cross brushing directions.

Drying time:

Contact dry time: 3-5 hours (in 25 ºC and 50% R.H).

Final drying: 14 days.

Storage:

In the shadow, protected from extreme cold (over 5ºC) and high temperature conditions.

Packaging:

22 kg.