About Dr. Fixit Torchshield P 3160/4160

{“name”:”Dr. Fixit Torchshield P 3160/4160″,”slug”:”drfixit-dr-fixit-torchshield-p-3160-4160″,”brand”:”Dr. Fixit”,”realProduct”:”yes”,”officialSource”:”https://www.drfixit.co.in/resources/library/technical-data/large-projects/106-dr-fixit-torchshield-p-3160p-4160″,”category”:”waterproofing”,”metaTitle”:”Dr. Fixit Torchshield P 3160/4160 | APP Membrane | Space Arc”,”metaDescription”:”Dr. Fixit Torchshield P 3160/4160 is a polyester-reinforced APP bitumen membrane, torch-applied for roof, basement and podium waterproofing across Delhi NCR.”,”heroSubtitle”:”A polyester-reinforced, torch-applied APP bitumen membrane engineered for heavy-duty waterproofing of roofs, basements, podiums and water-retaining structures.”,”glance”:{“whatIsIt”:”A 3mm or 4mm thick, polyester-reinforced APP (modified bitumen) membrane that is torch-welded onto a primed concrete surface to form a continuous, fully bonded waterproof layer.”,”whereUsed”:”Concrete roofs (sloped and flat), basements and swimming pools (external tanking), car parks, canal and water-retaining structure linings, retaining walls, and tunnels/subways.”,”whyUse”:”High tensile and tear strength from its 160 gsm polyester carrier, a softening point of ≥150°C suited to Indian roof temperatures, proven resistance to 5 bar water pressure, and a 36-month shelf life for large-project stocking.”,”howApplied”:”The substrate is levelled and primed with Dr. Fixit Torchshield P Primer, then the membrane is rolled out, torch-heated until the underside softens, and pressed/fused onto the surface with 100mm side laps and 150mm end laps, finished with aluminium paint or a protective screed.”},”about”:”Dr. Fixit Torchshield P 3160/4160 is Pidilite’s plain-finish, torch-applied APP (atactic polypropylene) modified bitumen membrane from the Torchshield large-projects range. A polyester carrier is saturated and coated with the modified-bitumen compound, and both faces are laminated with a polyethylene release film that burns off during installation. The ‘P’ in the name signals a plain black top surface meant to receive a protective finish afterward, which is what distinguishes it from the mineral-cap Torchshield AM variant designed to stay exposed. It’s supplied in 3mm and 4mm thicknesses as 1m x 10m rolls, and is aimed squarely at contractors and specifiers running basement tanking, terrace waterproofing, or civil/infrastructure waterproofing packages rather than at retail DIY use — torch application is a skilled, fire-based process that needs a trained crew, which is where an authorised applicator like Space Arc fits into the specification.\n\nOn performance, the numbers on Pidilite’s own data sheet do most of the talking: tensile strength of roughly 700 N/5cm along the roll and 450 N/5cm across it, tear strength of 350/300 N respectively, and elongation around 60% in both directions — reinforcement good enough to survive site traffic and rebar contact during the pour sequence above it, while still stretching with normal slab movement instead of splitting. A softening point of 150°C or higher keeps it stable through Delhi NCR’s peak summer roof temperatures, cold-flexibility testing shows no cracking down to 2°C for winter nights, and the finished membrane has been shown to hold back 5 bar of water pressure (a 50-metre head) without leaking — the kind of margin that matters on a basement or swimming-pool tanking job where a pinhole becomes a recurring seepage complaint. All of this still depends on correct primer coverage, torch technique and lap sealing at installation, which is the part a data sheet can’t guarantee on its own.”,”technicalInsight”:”APP (atactic polypropylene) modified bitumen behaves differently from SBS (styrene-butadiene-styrene) modified membranes also sold in adjacent torch-applied ranges: APP’s polymer chemistry gives it a higher softening point (≥150°C here) and better resistance to UV and thermal ageing, which suits India’s summer roof-surface temperatures that can exceed 70°C on an exposed terrace — SBS membranes are generally chosen instead where sub-zero cold flexibility or very high elongation is the priority. The L/T (longitudinal/transverse) split in every strength figure on the data sheet reflects the direction of the polyester carrier’s manufacture; specifiers checking lap orientation and roll-out direction on drawings should read tensile, tear and elongation values in the direction the membrane will actually be stressed on site, not just the headline number.”,”applications”:[“External tanking of basement and podium raft slabs before backfilling”,”Flat and sloped RCC roof/terrace waterproofing on residential and commercial buildings”,”Swimming pool shell tanking (external face)”,”Car park deck waterproofing under paver blocks or screed”,”Irrigation canal and water-retaining structure lining”,”Retaining wall and earth-contact structure damp-proofing”,”Tunnel and subway waterproofing”,”Refurbishment of ageing terraces ahead of monsoon”],”advantages”:[“160 gsm polyester reinforcement gives high tensile (~700 N/5cm) and tear (~350 N/5cm) strength, so the membrane survives site foot traffic and rebar contact during construction”,”Fully torch-fused laps create a continuously bonded membrane rather than a taped or adhesive-only joint”,”Softening point ≥150°C means it won’t soften or slump on an exposed terrace through a Delhi NCR summer”,”Verified to hold back 5 bar (50m head) of water pressure without leakage — a meaningful margin for basement tanking”,”Stays crack-free in cold-flexibility testing down to 2°C, useful for north-India winter nights”,”36-month shelf life gives large projects room to stage material deliveries without spoilage risk”,”Elongation of roughly 60% in both directions lets the membrane accommodate normal structural movement without tearing”,”Backed by Pidilite’s technical helpline and, through Space Arc, a trained torch-application crew rather than a supply-only relationship”],”limitations”:[“Torch-on application is a hot-works process — it needs trained applicators, fire-watch supervision and usually a hot-works permit, unlike a roller-applied liquid membrane”,”Cannot be applied below 5°C or onto a substrate with more than 6% surface moisture, so it is weather- and schedule-dependent”,”The plain (P) finish is not meant to stay exposed — it needs an aluminium paint or screed topping afterward, adding a step most liquid systems don’t require”,”Open-flame equipment and LPG cylinders on a live construction site are an inherent fire-safety risk that has to be actively managed, not just noted on the label”,”As a sheet product, detailing at pipe penetrations, drains and irregular upstands takes more skill and time than a liquid-applied coating”,”Being a petroleum-bitumen system, it doesn’t carry the low-VOC/green-building credentials of newer PU or PMMA liquid-applied membranes”],”bestPractice”:”Treat this as a professional torch-applied system, not a DIY sheet: level the substrate with polymer-modified mortar first, prime with Dr. Fixit Torchshield P Primer at 4-6 sq.m/litre and let it touch-dry overnight, then torch the roll so a visible bead of bitumen extrudes evenly along both edges — that bead is the only reliable visual check that fusion has actually happened, so never trowel it flat just to hide a cold lap. Keep side laps at a minimum 100mm and end laps at 150mm, detail every upstand, drain and pipe collar with extra membrane and a bitumastic or polysulphide sealant, and don’t skip the finish coat — aluminium paint on exposed non-trafficked terraces, screed wherever there’s foot or vehicle traffic. Flood-test before handover.”,”specs”:[{“property”:”Chemistry & carrier”,”value”:”APP-modified bitumen on 160 gsm non-woven polyester, PE-film faced both sides”},{“property”:”Thickness”,”value”:”3 mm ±5% / 4 mm ±5% (UEAtc M.O.A.T.30)”},{“property”:”Roll size”,”value”:”1 m x 10 m ±1% (EN-1848)”},{“property”:”Tensile strength”,”value”:”L 700 ±10%, T 450 ±10% N/5cm (EN-12311-1)”},{“property”:”Elongation at break”,”value”:”L 60±20%, T 60±20% (guided ASTM D5147)”},{“property”:”Softening point”,”value”:”≥150°C (guided IS:1205/1978)”},{“property”:”Cold flexibility”,”value”:”No crack up to 2°C (guided ASTM D5147)”},{“property”:”Water-pressure resistance”,”value”:”No leakage at 5 bar / 50 m head (UEAtc M.O.A.T.30)”},{“property”:”Shelf life”,”value”:”36 months from manufacture, stored per recommendations”}],”useCases”:[{“sector”:”Residential high-rise podiums”,”detail”:”External tanking of basement/podium raft slabs before backfilling on Gurugram and Noida group-housing projects, torch-welded directly onto primed RCC.”},{“sector”:”Institutional & commercial terraces”,”detail”:”Flat RCC roof waterproofing ahead of monsoon on schools, hospitals and office buildings across Delhi NCR, finished with reflective aluminium paint.”},{“sector”:”Water & irrigation infrastructure”,”detail”:”Canal and reservoir lining where a continuous, high-tensile membrane is needed to resist hydrostatic pressure and ground movement.”},{“sector”:”Swimming pools & clubs”,”detail”:”External tanking of pool shells before backfill, specified for its verified 5 bar water-pressure rating.”},{“sector”:”Multi-level car parks”,”detail”:”Deck waterproofing under paver blocks or screed on basement and podium parking levels subject to vehicular load.”}],”faq”:[{“q”:”What’s the difference between Dr. Fixit Torchshield P and Torchshield AM?”,”a”:”Torchshield P is a plain-top membrane meant to be protected with aluminium paint (non-trafficked) or a screed (trafficked); Torchshield AM carries a factory-applied mineral/slate-chip cap sheet so it can be left exposed as the final wearing surface. Choose P when you’re finishing with paint or screed, AM when the membrane itself will stay exposed to sun and foot traffic.”},{“q”:”Can Torchshield P be left exposed without a protective coat?”,”a”:”No — Pidilite’s own guideline for this range calls for an aluminium paint finish on non-trafficked terraces and a concrete screed overlay wherever there’s foot or vehicular traffic; the plain bitumen surface isn’t designed for long-term standalone UV and weathering exposure.”},{“q”:”What primer should be used, and how much do I need?”,”a”:”Dr. Fixit Torchshield P Primer, a bitumen-based primer, applied in one coat at roughly 4-6 sq.m per litre depending on substrate porosity — always prime and let it touch-dry before torching the membrane on top.”},{“q”:”Should I use the 3mm or 4mm thickness for a basement?”,”a”:”For external basement/podium tanking and any area under sustained hydrostatic pressure, most applicators default to the 4mm membrane for the extra puncture and tear margin; 3mm is more common on sloped roof areas with lower mechanical risk. Site conditions can shift that call, so it’s worth a quick check before ordering.”},{“q”:”Can this be installed during the monsoon?”,”a”:”Not really — the membrane can’t be torched onto a substrate with more than 6% surface moisture, and application is a fire-based hot-works process, so wet or actively raining conditions rule it out. It’s best scheduled for the dry season or under temporary cover.”},{“q”:”Does Space Arc supply the membrane only, or also apply it?”,”a”:”As an authorised Dr. Fixit distributor and applicator for Delhi NCR and pan-India, we do both — supply of genuine Torchshield P rolls and primer, plus trained torch-application crews and site supervision for basement, roof and podium waterproofing packages.”}],”positioning”:”Dr. Fixit Torchshield P 3160/4160 sits in Pidilite’s large-projects torch-applied range alongside Torchshield AM (mineral-cap, self-finished for exposed roofs), the related AP/AR/MF variants, and the companion Torchshield P Primer every installation depends on — Space Arc stocks the family so a project can move from primer to plain membrane to mineral-finish cap sheet without switching suppliers. Where a specifier or main contractor has already standardised on Fosroc for other scope items, the direct equivalent is Fosroc’s Proofex Torchseal 3P & 4P, a similarly torch-applied APP membrane on a slightly heavier 180 gsm polyester carrier — both perform in the same class, and the choice usually comes down to whichever brand’s primer/accessory system and site technical support the contractor already trusts. Outside torch-applied sheets, if a deck has too many upstands, pipe penetrations or tight details for a rolled membrane, Dr. Fixit’s liquid-applied polyurethane and cementitious coating ranges are worth considering instead.”}

The technical insight

APP (atactic polypropylene) modified bitumen behaves differently from SBS (styrene-butadiene-styrene) modified membranes also sold in adjacent torch-applied ranges: APP’s polymer chemistry gives it a higher softening point (≥150°C here) and better resistance to UV and thermal ageing, which suits India’s summer roof-surface temperatures that can exceed 70°C on an exposed terrace — SBS membranes are generally chosen instead where sub-zero cold flexibility or very high elongation is the priority. The L/T (longitudinal/transverse) split in every strength figure on the data sheet reflects the direction of the polyester carrier’s manufacture; specifiers checking lap orientation and roll-out direction on drawings should read tensile, tear and elongation values in the direction the membrane will actually be stressed on site, not just the headline number.

Where it is used

• External tanking of basement and podium raft slabs before backfilling
• Flat and sloped RCC roof/terrace waterproofing on residential and commercial buildings
• Swimming pool shell tanking (external face)
• Car park deck waterproofing under paver blocks or screed
• Irrigation canal and water-retaining structure lining
• Retaining wall and earth-contact structure damp-proofing
• Tunnel and subway waterproofing
• Refurbishment of ageing terraces ahead of monsoon

Key advantages

• 160 gsm polyester reinforcement gives high tensile (~700 N/5cm) and tear (~350 N/5cm) strength, so the membrane survives site foot traffic and rebar contact during construction
• Fully torch-fused laps create a continuously bonded membrane rather than a taped or adhesive-only joint
• Softening point ≥150°C means it won’t soften or slump on an exposed terrace through a Delhi NCR summer
• Verified to hold back 5 bar (50m head) of water pressure without leakage — a meaningful margin for basement tanking
• Stays crack-free in cold-flexibility testing down to 2°C, useful for north-India winter nights
• 36-month shelf life gives large projects room to stage material deliveries without spoilage risk
• Elongation of roughly 60% in both directions lets the membrane accommodate normal structural movement without tearing
• Backed by Pidilite’s technical helpline and, through Space Arc, a trained torch-application crew rather than a supply-only relationship

Limitations & considerations

• Torch-on application is a hot-works process — it needs trained applicators, fire-watch supervision and usually a hot-works permit, unlike a roller-applied liquid membrane
• Cannot be applied below 5°C or onto a substrate with more than 6% surface moisture, so it is weather- and schedule-dependent
• The plain (P) finish is not meant to stay exposed — it needs an aluminium paint or screed topping afterward, adding a step most liquid systems don’t require
• Open-flame equipment and LPG cylinders on a live construction site are an inherent fire-safety risk that has to be actively managed, not just noted on the label
• As a sheet product, detailing at pipe penetrations, drains and irregular upstands takes more skill and time than a liquid-applied coating
• Being a petroleum-bitumen system, it doesn’t carry the low-VOC/green-building credentials of newer PU or PMMA liquid-applied membranes

Selection & best practice

Specifications

Industry use cases

How we position Dr. Fixit Torchshield P 3160/4160

Dr. Fixit Torchshield P 3160/4160 sits in Pidilite’s large-projects torch-applied range alongside Torchshield AM (mineral-cap, self-finished for exposed roofs), the related AP/AR/MF variants, and the companion Torchshield P Primer every installation depends on — Space Arc stocks the family so a project can move from primer to plain membrane to mineral-finish cap sheet without switching suppliers. Where a specifier or main contractor has already standardised on Fosroc for other scope items, the direct equivalent is Fosroc’s Proofex Torchseal 3P & 4P, a similarly torch-applied APP membrane on a slightly heavier 180 gsm polyester carrier — both perform in the same class, and the choice usually comes down to whichever brand’s primer/accessory system and site technical support the contractor already trusts. Outside torch-applied sheets, if a deck has too many upstands, pipe penetrations or tight details for a rolled membrane, Dr. Fixit’s liquid-applied polyurethane and cementitious coating ranges are worth considering instead.

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