Dac-Hydro Alu
A waterproofing system for roofs, based on water-dispersed acrylic for existing roof finishes.
The Dac-Hydro Alu system is designed to have 400% elasticity, and be vapour permeable. Reflective aluminium flakes in the coating film prevent warming of the roof covering. Dac-Hydro Alu builds an abrasion resistant, rubber-like coat without joints or seams. It keeps its aluminium finish even in strongly varying atmospheric conditions (UV rays, water, temperature fluctuations). Dac-Hydro Alu can be directly applied on metal roofing (except new galvanized steel), most bituminous products (more than 1 year old) and most waterbased products like Dakfill and Noxyde. It is not for use on Fillcoat or Fillcoat Fibres - in this case apply a primer coat of Dakfill. It cannot be applied on flexible PVC, EPDM, tar, polyisobutylene and smooth bitumen-polymers.
Preparation:
Clean substrate with water under high pressure (200 bars), and dry. Fill all joints with Elastofill, bridging active gaps with Dakfill Bridging Fleece or Overbridging Mesh.
Uniclass 2015 | |
CAWS | J31/5 Cold deck roof coating M60/195 Special coating M60/18 Special coating J31/110 Cold deck roof coating |
Product Reference | Dac-Hydro Alu |
Primer | Not requiredPrimer No 44 diluted with 30% Thinner No 22 |
Coating application | Dac-Hydro-Alu, brush or roller applied |
Rate of application | 0.3–0.5 litres/m²1–1.5 litres/m²2 litres/m² |
Reinforcement | Not requiredDakfill-mesh |
Minimum dry film thickness | 480 micrometres |
Standard product features | AFNOR Classification: Group II, class 7b2. Colour: Aluminium. Density (ASTM D1475, 20°C): 1.03–1.06 g/cm³. Drying time at 20°C:
Actual drying times are dependent on relative humidity, temperature and composition of the material. Flashpoint (DIN 53213): Non-flammable. Solids content (ASTM D1644/a): In volume 47–49%. In weight 50–52%. |
Product Options | Primer: Very porous substrates: Primer 44 diluted with 30% Thinner 22. Reinforcement: Dakfill Fleece (polyester fibres woven in hexagonal meshes) embedded in the first coat of Dakfill New is recommended on roofs with pitches between 1° and 5° or where movement of the substrate is to be expected. Coating - rate of application:
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