Rooftite S 20

The surface shall be cleaned thoroughly of all contaminants like dust, traces of curing compound, oil and grease. All surface imperfections, protrusions, structurally unsound and friable concrete must be removed and repaired with a suitable Polycrete* concrete repair mortar.

Apply the primer @ 4-6 m²/lt by a brush or roller.  Allow the primer to dry prior to the application of the waterproofing membrane

Start the installation of all membrane plies from the low point or drains, so that the flow of water is over or parallel to the plies, but never against the laps. All overlaps at the membrane seams shall be installed so as to have «up» slope laps over «down» slope laps. Begin membrane application by unrolling the roll of Bitustick XL membrane and aligning the side laps.

Peel off the release film from the self adhesive side and start unrolling the membrane and press it to the surface. Smoothen the membrane from the center to the edges with a wooden press in order to remove entrapped air. Furthermore, an iron roller shall be used for rolling on top of the applied membrane to ensure a proper and strong adhesion of the bitumen compound with the base surface. Side overlaps shall be a minimum of 50mm on the selvedge and end overlaps 100mm.

Bitustick XL membrane is now to be protected with a self-adhesive protection membrane Bitustick R300. Bitustick R300 is to be placed at 50% staggered overlaps over the 1st layer of Bitustick XL

Apply Bitutape TS on the end joints and cut joints (wherever selvedge is not available) of Bitustick R300 prior to laying of the membrane

Overlaps 

Side overlaps, ends overlaps and cut portions joineries shall be with 100mm overlapping, using a double-sided tape Bitutape TS – 100mm wide. One side of the release film is removed and the twin sided tape is adhered to the previous layer of membrane and the second side release film is removed and subsequent membrane layer is carefully placed over it, by ensuring the secured seal with firm press using a steel roller.

1. Unroll and align Bitustick R300 membrane on 1st layer to fit the orientation and roll it back.  Now slowly peel off the release film at the back and simultaneously the release film from the top of Bitutape TS and carefully place the membrane without changing its orientation.
2. Entrapped air shall be smoothened out from the center to the sides by a wooden press followed by rolling with an iron roller to ensure a proper and strong adhesion of the bitumen compound with base surface and also on the overlaps to ensure that the overlaps are completely sealed
3. Selvedge of 50mm width is available only on the sides of the membrane which allows continuous application of the subsequent rolls.  The membranes shall be butt-jointed at the laps using Bitutape TS as the joint sealer beneath the butt joints to provide a watertight sealing