DESMOFLEX® - Polyurethane Anthracite Grey

The careful preparation of the surface is important in order to have excellent result and high durability. The surface has to be clean, dry, without damages and free of any contamination which can affect negatively the adhesion of the membrane. Remove all old, loose coatings and dust. New concrete structures need at least 28 days in order to dry.

Maximum moisture content should not exceed 5%. Old, loose coatings, dirt, fats, oils, organic substances and dust need to be removed by a grinding machine. Possible surface irregularities need to be smoothened. Any loose surface pieces and grinding dust need to be thoroughly removed.

BE CAREFUL: Do not clean the surface with water. The careful sealing of existing cracks and joints is extremely important for long lasting waterproofing results.

Repair of cracks: Clean the cracks from dust, residue or other contamination. Prime locally with the primer DESMOFLEX EPOXY PRIMER and allow 2-3 hours to dry. Fill the cracks with the sealant ELASTO PU. Then, apply locally fair enough of waterproofing material DESMOFLEX PU, and while wet, cover with a suitable cut stripe of THRAKON fabric of 60g/m2 , width of 20 cm, centered over the crack. Press the stripe with a metallic roll in the liquid in order to be irrigated. Then, saturate enough waterproofing material DESMOFLEX PU, until presented full repletion.

Repair of joints: Clean expansion joints and control joints of dust, residue or other contamination. If the joint is too small, use cutting machine in order to widen it to the prescribed size. The prepared movement joint should have a depth of 5-15mm. The width-depth ratio of the movement joint should be 2:1. With a brush, apply waterproofing material DESMOFLEX PU of 20cm width, centered over and inside the joint. Place a stripe of polyester geofabric over the wet material and with a suitable tool press the stripe deeply in the joint, till its internal surface to be fully covered with the geofabric. Apply over the fabric fair enough waterproofing material DESMOFLEX PU, till repletion. Then, place in the joint a suitable polyurethane cord and fill in the remaining free space of the joint with the sealant ELASTO PU. Allow it for 12 to 18 hours in order to be polymerized.

Priming: Prime absorbent and non-absorbent surfaces like concrete (also prime fresh concrete), cement screed or wood metal, bituminous membranes, ceramiv tiles and old acrylic coatings with the DESMOFLEX EPOXY PRIMER.

Application of waterproofing membrane: After approx. 6-12 hours (not later than 24 hours) and while the DESMOFLEX EPOXY PRIMER is still a bit tacky, apply the polyurethane coating DESMOFLEX PU. Pour enough of DESMOFLEX PU onto the prepared and primed surface and lay out by roller or brush. Continue with the same way till the surface for waterproofing is fully covered.

After 12 hours (till 48 hours), apply another layer of DESMOFLEX PU. For bigger surfaces, apply a third layer of the product.

Finishing: For excellent results, cover the whole waterproofed surface with one layer of the elastic protection paint DESMOFLEX TOP COAT. The use of DESMOFLEX TOP COAT, is recommended especially when applied dark colors exposed to the sunlight. (after 12-24hours of DESMOFLEX PU) In case of the surface is going to accept heavy circulation of pedestrians (e.g. stadium shuttles), apply two layers.