About Sika SikaShield P24 MG IN 3 mm

SikaShield P24 MG IN 3 mm is Sika’s prefabricated torch-on waterproofing membrane built for Indian roofs that have to live in the open. The sheet is manufactured from bitumen modified with atactic polypropylene (APP), which raises the softening point and gives the membrane its heat resistance and dimensional stability through long summers. A non-woven polyester carrier runs through the core to carry the mechanical load, while the top face is coated with mineral granules that shield the bitumen from ultraviolet degradation. This combination lets specifiers waterproof an exposed terrace or podium without pouring a protective screed over the membrane afterwards, which saves both dead load and programme time on site.

For engineers and applicators, the product sits in the familiar torch-applied family: rolls are 1.0 m wide and 10.0 m long, and the underside carries a polyethylene burn-off film that indicates when the bitumen has reached bonding temperature. It can be installed as a single exposed layer on lighter roofs or as the mineral-finished cap sheet over a plain base membrane in a two-ply build-up for critical decks. Because it is a factory-made sheet rather than a liquid coat, thickness is consistent across the whole area at a controlled 3 mm, which removes the guesswork that comes with brush- or spray-applied systems on large horizontal surfaces.

The technical insight

The membrane works because APP behaves like a thermoplastic modifier in the bitumen blend. Plain bitumen softens and creeps in heat and cracks in cold; blending in atactic polypropylene widens that service window, pushing the softening point to at least 145 C and holding the sheet stable with no flow when held at 120 C for two hours, while still keeping it flexible down to around -2 C. That heat stability matters on a Delhi or Chennai rooftop where surface temperatures climb well past ambient. The polyester carrier is what gives the sheet its strength and puncture resistance: roughly 600 N per 50 mm longitudinally and 400 N per 50 mm across, with about 40% elongation, so it can bridge minor substrate movement and shrinkage cracks without tearing. During torching, the polyethylene film and the compound underside melt together and fuse to the primed deck, producing a fully bonded layer with no water channel underneath. Continuously welded 80-100 mm side laps and 150 mm end laps turn the individual rolls into one monolithic watertight skin rated to at least 10 kPa.

Where it is used

• Exposed flat and low-slope roofs up to a 15% gradient
• Terraces, balconies and open decks that carry pedestrian traffic
• Podium slabs over basements and parking structures
• Bridge decks and other civil infrastructure surfaces
• Mineral-finished cap sheet in two-ply torch-on systems
• Areas where tiles are to be laid directly over the membrane
• Re-roofing and refurbishment of ageing bituminous roofs
• Single-layer waterproofing where a UV-stable exposed finish is required

Key advantages

• Mineral granule surface resists permanent UV exposure, so no protective screed is needed on exposed areas
• APP modification delivers a high softening point (>=145 C) and no flow at 120 C for Indian summer roofs
• Factory-controlled 3 mm thickness gives uniform coverage that liquid systems cannot guarantee
• Strong non-woven polyester core resists puncture and bridges minor cracks (approx 600 N/50mm longitudinal)
• Fully bonded torch application leaves no water path beneath the sheet
• Fast to lay over large horizontal areas compared with multi-coat liquid membranes
• Can be used single-layer or as the cap sheet in a two-ply build-up
• Tiles can be laid directly over the membrane, simplifying finished-floor detailing

Limitations & considerations

• Requires open-flame torching, so it is unsuitable near flammable substrates, insulation or occupied zones without fire precautions
• Needs a skilled, trained applicator; poor heating starves the laps and bond and causes leaks
• Substrate must be dry (moisture not exceeding 6%) and primed before application
• Application is limited to a +10 C to +40 C ambient and substrate window
• Cold-weather handling below the flexibility point risks cracking the sheet when unrolled
• Not a self-adhesive or cold-applied product, so it cannot be used where a naked flame is prohibited

Selection & best practice

Specifications

Industry use cases

How we position Sika SikaShield P24 MG IN 3 mm

Within the Sika torch-on family, choose the mineral-granule P24 MG when the membrane stays exposed; specify a plain or polyethylene-faced SikaShield P24 base membrane beneath it when you need a two-ply build-up, and pair it with a Sika bitumen primer plus Sikalastic or SikaProof detailing at drains and upstands. For liquid-applied alternatives on complex geometry, Sika’s SikaTop and Sikalastic ranges are the natural companions from the same brand. Space Arc also stocks equivalent torch-on membranes from Dr. Fixit and STP (Shalimar) where a different commercial preference or availability applies, so we can match the specification across brands. As Sika-authorised distributors and applicators across Delhi NCR and pan-India, we can supply the membrane, the full accessory chain and trained torch-on crews for the project.

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