Product Description
Hydradry is a cementitious compound designed for application to the internal surfaces of walls and the associated solid floors of cellars, basements and other areas below ground level and subject to penetrating dampness. The Hydradry system prevents ingress of liquid water and works by forming a physical and chemical bond with the substrate. It provides a monolithic waterproof membrane yet still allows some vapour transmission thereby reducing the risk of condensation. Hydradry can provide sufficient protection of a ‘Grade 3’ basement as defined in Table 1 of BS8102 : 1990 and conforms with Category 7 of the BCA basement waterproofing design and site guides.
Application
General: Immediately prior to application of Hydradry or backing coats the substrate to be treated should be cleared of all dust etc. and thoroughly wetted with clean water. At the
time of application all surfaces must be damp but free of surface water.
Hydradry powder should be mixed with clean water to a brushable slurry paste consistency (approx. 6.5 litres/25kg Hydradry powder). Mixed material should be used within 30 minutes.
Hydradry should be applied using a stiff bristled brush or broom (wash frequently to avoid clogging). Two coats of Hydradry should be applied at a thickness of 1.5mm per coat. It is essential that the first coat is brushed well into the surface to ensure a good bond with the substrate. The second coat may be applied as soon as the initial application has dried sufficiently to form a firm base. This will normally be between 2-16 hours depending upon site conditions (allow more time for curing then temperatures fall below 10ºC).Where Hydradry is applied by towel (reduce gauging water slightly) this must be restricted to the second coat and a “stippled” finish left (use applicator brush) to provide a physical key for subsequent replastering.
Hydradry should not be applied in a thickness greater than 3-4 mm (2 coats).Where each application cannot be finished within a single working day it is essential than an overlap of at least 250mm is used to prevent butt joints. Work should not be stopped at corners or other natural breaks in the construction.
N.B. During application the temperature of both the substrate and materials must not fall below 5ºC. In winter months avoid using chilled mixing water. Use warm water (20ºC) for Hydradry.
Advantages
- Waterproofs cellars and basements.
- Suitable for brick, stone, block, concrete, etc.
- Resists hydrostatic pressure up to 5 metres head
- Can be applied to saturated surfaces
- Easy brush application
- Suitable for use in contact with potable water
- BBA Approved
Coverage
Approximately 3kg per square metre per coat (two coats recommended).
Product Data Sheets
Technical Data Sheet Safety Data Sheet Hydradry BBA
CertificateOther Information
This Product is
BBA Approved. Agrément Certificate No:
02/3961.
