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 at low point from the roof, unroll the DR. FIXIT TORCHSHIELD roll once the priming coat is dried.Align the DR. FIXIT TORCHSHIELD roll correctly & re-roll it half inlignment 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 to bond from the lower end towards the higher end. 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
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Clean & remove dust, dirt, loose particles and unsound substrate
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Apply primer coat with solvent based bitumen primer |
Unroll the DR. FIXIT TORCHSHIELD roll
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Align the Dr. Fixit Torchshield Roll |
Use gas burner to heat substrate & underside to softening points |
Keep overlap margin for minimum 100 mm |
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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 |
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Termination of Membrane
The membranes shall be first laid up to the parapet wall junction and then shall be overlapped with another membrane (flashing) with an overlap of 100 mm and taken upward on the parapet wall up to a distance of 300 mm. This overlap shall be firmly sealed over the corner rounding or fillet area at the junction of parapet wall and slab The rendering shall be done above this level till top of parapet wall to match the level of membrane and drip mould shall be created in the plaster at the place where membranes is terminated to drift the rainwater away from the membrane. Alternatively an aluminium or G.I. sheet flashing can also be fixed over the membrane, fixed with GI screws with the parapet wall
At the opening of Rain water pipes
The places where opening are encountered for rain water down take pipes, the membranes shall be cut open by sharp knife in + sign in the center of an opening. Circular cutting shall not be done. Torching shall be done on the reverse side of these four triangular pieces. Bend all the four pieces inside and tightly pressed against pipe surface
Termination At The Expansion Joints
The treatment shall have to terminate at the expansion joint. The curb wall of 4 inches thick shall be constructed on both sides of joint. The height can vary from 300 mm to 500 mm. The curb wall shall be plastered smoothly and corner rounding with polymer-modified mortar shall be done before membrane applications starts. The final slope of screed shall be away from the joint. The joint shall be covered either with GI strip fixed on one of the curb walls while leaving other end free or by neoprene sheet.
The expansion joint shall be filled with 2 part flexible Polysulphide Selant from the Dr. Fixit Range as per the specifications.
Protection
The Torchshield membranes shall be protected either with concrete screed laid to slope or by applying bitumen based aluminium paint in 2 coats for the slopped roofs.
The roof slabs used for human traffic or for any other purpose, concrete screed shall be laid as per Architects specifications. For non-sanded membrane, sprinkle sand on the top surface of membranes after torching the top of membrane for better adhesion with subsequent screed. |
