The RCC for basement shall be laid as per standard engineering practices, which include correct placing of concrete, proper compaction, provision of water stops at every cold joints, curing, etc.,

The PCC for basement shall be of minimum M 15 grade concrete laid to minimum of 100 mm thickness and cured for 15 days.
Surfaces to be applied upon, must be clean, reasonably dry, free form dirt and loose material, and conform to the agreed minimum surface standard

Primer Application

Apply solvent-based bitumen primer on cleaned & leveled surface @ 3-5 sq.mtr/ltr. The priming will enhance the adhesion of the membrane to the substrate. Allow the primer coat to dry. The drying will generally depend on the ambient temperature

Membrane Application

Starting from one end, unroll the DR. FIXIT TORCHSHIELD roll once the priming coat is dried. Align the DR. FIXIT TORCHSHIELD roll correctly & re-roll it half in alignment before torching. Avoid shifting of the membrane while torching Use gas burner to heat substrate & underside to softening points. When the embossing disappears, roll forward & press firmly against substrate. Ensure sufficient bleed on side & end over laps. Once the half of the roll is torched properly to the substrate, unroll the balance roll and repeat the process. An overlap of 100-mm shall be maintained for all the continuing sides. Heating shall be done on both the membranes to be overlapped and pressed firmly with the help of round shape trowel. The care shall be taken to leave no gap at any point in the overlapped area. If noticed, reheating shall be done to seal it. The Torchshield must be laid over the entire PCC area with a minimum of 150 mm over hang from the size of raft on all sides.

Protection

The Torchshield membranes shall be protected against damage by laying sand cement mortar in 1:4 ratio at 15 to 20 mm thickness. Cure the surface for 7 days before starting the work for laying RCC raft or column footings.

The entire external surface of the wall shall be prepared properly and made ready to receive the waterproofing treatment. All the honeycomb areas, undulations, cracks shall be filled with polymer modified mortar. For which Dr. Fixit Polymer Mortar PX shall be used as per the standard material specification.

Primer Application

Membrane Application

Dr. Fixit Torchshield P 3160 / P 3050 shall be applied as per the standard installation practices as explained above over the dried primer. Before the application of Torchshield begins over the wall, a corner rounding / angle fillet shall be made at the junction of PCC and Raft to avoid the right angle bend of membrane.
The application of membrane shall begin from the edge of PCC with a sufficient lap of 100 mm minimum with the bottom membrane (over PCC) and to be taken over raft thickness and then over the wall. An overlapping of 100 mm must be ensured with the subsequent membrane with all sides. The fixing shall be done from the PCC level moving horizontally first and then vertically.
All the lap joints and termination shall be done as per standard specifications as explained earlier.

Clean & remove dust, dirt, loose particles and unsound substrate	Apply primer coat with solvent based bitumen primer	Unroll the DR. FIXIT TORCHSHIELD roll
Align the Dr. Fixit Torchshield Roll	Use gas burner to heat substrate & underside to softening points	Keep overlap margin for minimum 100 mm
Heat both the overlaps & use round tipped trowel to seal overlap	Seal the edges well and protect with a Polysulphide sealant	Dr. Fixit Torchshield applied all over the terrace

Protection

The back filling can start simultaneously as one move upward. Before back filling begins, the membrane shall be protected either with plaster or with a protection board.
For plaster, sand shall be sprinkled over the membranes as soon as it is fixed after torching. The plastering shall be done in 1:3 sand cement mortar at 15 mm thickness. Thermocol in 20 mm thickness can be used as a protection board. The cold bitumen (mastic) can be used for fixing the Thermocol over the Torchshield. Once the Thermocol is fixed, back filling can start in layers. This will allow people to work comfortably as it will create the platform to work as one move upwards.