Waterproofing works at low temperatures and high relative humidity rate

The performance of polymer-modified bitumen thick coatings (PMBC) depends upon how far the active compound has dried thoroughly, before water load begins. Particularly during cool and humid months the influence of atmospheric conditions on the waterproofing material and the concerned building parts must be taken into consideration. This point is important for all application steps, starting with substrate examination until backfilling of excavation.

Step by step

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    1. During winter temperatures often drop under 0°C. Frozen substrates are not suitable for any waterproofing system (bitumen- or cement-based or mortar systems). Drying time of substrates must be helped.

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    2. Strong rain falls make substrates totally damp. Waterproofing compounds cannot bond onto them. Their drying is substantially slowed down. Furthermore, due to frost influence it might come to spalling.

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    3. Standing water inside basement rooms can creep into the masonry and pull-off the bitumen waterproofing which has been already applied on the external side of basement walls. In such a case apply the quick-setting and watertight groove mortar weber.tec 933 along the whole angle wall/floor; afterwards apply it as patching mortar on the internal whole groove area, e.g.. approx. 25 cm upwards and downwards the angle.

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    4. High humidity and low temperatures slow down the drying process. Hence longer waiting times must be taken into consi-deration. This means also longer waiting times for bonding of insulation boards and also for excavation backfilling in case of 1-comp. systems. Two-comp. bitumen com-pounds dry much quicker that one-comp. ones during winter season. For this rea-son, 2-comp. lightweight bitumen waterproofing thick coatings like weber.tec Su-perflex 10 are by far more suitable than 1-comp. sys-tems for waterproofing in winter time under such conditions

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    5. For absolute reliability on external sides of basement walls use the 2-comp. re-active waterproofing slurry weber.tec Superflex D 2 or the 2-comp. reactive, thick and quick-setting water-proofing coating D 24, since they dry thoroughly within max. 24 hours at temper-atures over +1°C and inde-pendently from humidity rate