Bitumen-sam (membranes, primers)
CERESIT BT 21
Sealing membrane
Self-adhesive membrane for reliable waterproofing of buildings in the temperatures above 5 °C
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Immediately water- and rain resistant
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Cold-applied
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Flexible and crack-bridging
- Description
- How to Use
- FAQ
CERESIT® BT 21 is used for sealing vertical and horizontal surfaces of buildings, structural components and below the ground structures, such as underground car parks and subways. It is suitable for waterproofing basement walls, garage roofs, balconies, terraces, wet rooms and patios. Also used as a sealant against capillary rise of moisture and as a water vapour barrier in floor areas under screeds.
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Immediately water- and rain resistant
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Cold-applied
-
Flexible and crack-bridging
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In combination with BT 26 applicable also on moist surfaces
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Amount required: 1.08 m2/m2
CERESIT BT 21 is suitable for waterproofing basement walls, garage roofs, balconies, terraces, wet rooms and patios. Also used as a sealant against capillary rise of moisture and as a water vapour barrier in floor areas under screeds.
Ceresit BT 21 can be applied on smooth, cavity-free surfaces such as concrete, screeds, plasters, bitumen, wood, metals, ceramic tiles and thermal insulation. In combination with BT primers it can also be applied on moist and old surfaces down to -5 °C.
Use the BT 21 »All-Weather« Waterproofing Membrane only in dry conditions at temperatures from –5 °C to +30 °C (but not in blazing sunshine) and below 80 % relative air humidity.