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.
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.
J31/5 Cold deck roof coating
M60/195 Special coating
M60/18 Special coating
J31/110 Cold deck roof coating
Primer No 44 diluted with 30% Thinner No 22
Dac-Hydro-Alu, brush or roller applied
Rate of application
Minimum dry film thickness
Standard product features
Group II, class 7b2.
Density (ASTM D1475, 20°C):
Drying time at 20°C:
Actual drying times are dependent on relative humidity, temperature and composition of the material.
Flashpoint (DIN 53213):
Solids content (ASTM D1644/a):
In volume 47–49%. In weight 50–52%.
Very porous substrates: Primer 44 diluted with 30% Thinner 22.
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: