Sika SikaShield E50 HDPE SA 1.5 mm
A cold-applied, self-adhesive SBS-bitumen membrane with a cross-laminated HDPE face that bonds fully to primed concrete for reliable below-ground waterproofing.
What is it?
A 1.5 mm self-adhesive, post-applied sheet membrane built from an SBS-modified bitumen compound faced with cross-laminated HDPE film and backed by a peel-off release liner.
Where is it used?
Basement rafts and retaining walls, podium slabs, decks, foundations and tanking works across below-ground structures.
Why use it?
It bonds fully to the substrate with no torch or heat, so leaks cannot track laterally between membrane and concrete, and it installs safely on fire-sensitive or occupied sites.
How is it applied?
Prime the sound concrete with SikaShield Primer S-30 or W-30, peel the liner, roll the membrane down with 100 mm side and 150 mm end laps, and press out air with a heavy roller.
About Sika SikaShield E50 HDPE SA 1.5 mm
SikaShield E50 HDPE SA IN 1.5 mm is Sika’s self-adhesive answer to below-ground tanking where torch application is either unsafe or simply unwanted. The sheet is a fully bonded, post-applied membrane 1.5 mm thick, made by pre-coating a cross-laminated high-density polyethylene film with an SBS-modified bitumen compound. A removable release liner protects the adhesive face until the roll is laid, so the crew works cold, without gas cylinders or open flame. In Sika’s own declaration it is a bonded sheet membrane conforming to IS 16471:2017, which matters when a consultant is writing specifications for an Indian project and needs a recognised reference standard against the product.\n\nThe grade sits in the mid-range of the SikaShield family: the E50 designation and the HDPE facing distinguish it from the heavier E80 sheet and from the pre-applied Sika products that lock into fresh concrete. For contractors in Delhi NCR and across India, the practical draw is speed and simplicity. There is no primer-plus-torch sequence, no melting bitumen, and no specialist equipment beyond a roller and a knife. It suits basement rafts and walls, podium slabs, foundations and retrofit tanking on renovation sites, and because it is genuinely cold-applied it clears the way to work near timber shuttering, waterproofing over occupied floors, or in enclosed shafts where a flame would never be permitted.
The technical insight
The performance of any post-applied membrane hinges on one thing: whether it stays bonded to the concrete. SikaShield E50 answers this with a full-contact self-adhesive bond rather than a mechanical fix or spot adhesion. Once the release liner is peeled and the sheet is rolled down onto a primed substrate, the SBS-modified bitumen wets the surface and forms a continuous bond with a peel adhesion above 1.5 N/mm. That continuous contact is what defeats water tracking: if the membrane is only loosely attached, any breach lets groundwater migrate sideways under the sheet until it finds a construction joint, and the leak surfaces far from where the damage occurred. A fully bonded sheet confines any breach to the point of damage, which is why fully bonded systems are the preferred detail for basements below the water table. The cross-laminated HDPE top film carries the mechanical duty, giving tensile strength above 3.5 N/mm2, static puncture resistance over 200 N and tear resistance over 125 N/mm, so the sheet survives rebar traffic and backfill. SBS modification keeps the bitumen flexible at low temperature, with no cracking at -15 C, so the membrane bridges minor substrate movement instead of splitting over it.
Where it is used
- Tanking of basement rafts and retaining walls in below-ground structures
- Horizontal waterproofing to podium slabs, decks and protrusions
- Vertical waterproofing to reinforced-concrete walls and lift pits
- Single and strip foundations exposed to soil and groundwater
- Retrofit and reconstruction tanking on renovation projects
- Fire-sensitive sites where torch-applied membranes are prohibited
- Enclosed shafts, ducts and confined areas needing flame-free installation
Key advantages
- Cold-applied and self-adhesive, so no gas torch, flame or melting is needed on site
- Fully bonded to the substrate, confining any breach and stopping lateral water tracking
- Fast to lay with only a roller and knife, with no specialist plant required
- Cross-laminated HDPE facing gives strong puncture, tear and tensile resistance
- SBS modification keeps the sheet flexible with no cracking down to -15 C
- Good resistance to aggressive substances naturally present in soil and groundwater
- Backed by IS 16471:2017 declaration, giving specifiers a clear reference standard
- Supplied and applied through Space Arc as an authorised Sika distributor across Delhi NCR and Pan-India
Limitations & considerations
- Below-ground membrane only; it must be protected from UV and cannot stay exposed
- Needs a compatible SikaShield primer (S-30 or W-30) on the concrete before laying
- Substrate must be firm, smooth, clean and dry, with blowholes and cracks pre-repaired
- Below +5 C or in wet conditions, heating equipment is required to bring the substrate into range
- Requires a protection layer, screed, geotextile or drainage board before backfilling or follow-on trades
- Not a self-healing crack-bridging coating; larger structural movement needs a jointed detail
Selection & best practice
Start with the substrate: it must be sound, smooth and dry, with blowholes, honeycombing and cracks made good using a Sika repair mortar such as the SikaTop or Sika MonoTop range before any membrane goes down. Prime with SikaShield Primer S-30 IN or W-30 IN at the stated rate and let it dry fully. Keep the substrate at least 3 C above the dew point, work between +5 C and +50 C with relative humidity under 80 percent, and use heating equipment if conditions fall outside that window. Lay sheets parallel, peel the liner progressively, and bond from one end while pressing the sheet down; roll the whole surface with a heavy roller to expel trapped air. Maintain 100 mm side laps using the pre-formed selvedge and 150 mm end laps, cut a 45-degree corner at end overlaps, and never form counter-gradient laps that would let water run under the sheet. Detail all corners, upstands, pipes and drains with a sharp knife per the method statement, then install the protection layer promptly so site traffic and backfill do not damage the membrane.
Specifications
| Chemical base | SBS-modified bitumen compound; cross-laminated HDPE top film, PE release liner |
| Thickness | 1.50 mm +/- 0.08 mm (ASTM D5147) |
| Mass per unit area | 1.70 kg/m2 +/- 0.09 (ASTM D5147) |
| Roll size | 1.0 m wide x 20.0 m long (EN 1848-1) |
| Tensile strength / elongation | >3.5 N/mm2, elongation at break >180% (ASTM D412) |
| Static puncture / tear resistance | >200 N (ASTM E154); tear (nail shank) >125 N/mm (ASTM D4073) |
| Joint peel / adhesion in peel | >1.8 N/mm to itself (D1876); >1.5 N/mm to primed substrate (D903) |
| Water tightness / low-temp flexibility | No leakage at 6 bar (ASTM D5385); no cracks at -15 C (ASTM D1970) |
| Service temperature | -15 C to +50 C; standard IS 16471:2017 |
Industry use cases
Residential and commercial basements
Full tanking of raft slabs and retaining walls below the water table, where a fully bonded sheet prevents groundwater from tracking laterally to construction joints.
Podiums and terraces
Horizontal waterproofing to podium decks and slabs above habitable space, laid cold so follow-on trades are not exposed to torch risk.
Infrastructure and foundations
Protection of strip and single foundations, lift pits and buried structures against aggressive salts and moisture in the surrounding soil.
Renovation and heritage retrofit
Re-tanking of existing below-ground structures on occupied or fire-sensitive sites where an open flame is not an option.
Institutional and industrial builds
Below-ground envelope waterproofing for hospitals, data centres and plants where flame-free, low-odour installation is preferred near live services.
Frequently asked questions
Is SikaShield E50 HDPE SA torch-applied?
Does it need a primer, and which one?
Can the membrane be left exposed to sunlight?
What overlaps should I maintain?
What is the roll size and thickness?
Can I apply it in cold or wet weather?
How we position Sika SikaShield E50 HDPE SA 1.5 mm
SikaShield E50 HDPE SA is the mid-weight, cold-applied choice in Sika’s below-ground range. Where a project needs a heavier sheet, step up to SikaShield E80 HDPE SA 1.5 mm; both grades require a SikaShield Primer S-30 IN or W-30 IN on the concrete first, and substrate defects should be made good with a Sika repair mortar from the SikaTop or Sika MonoTop family before laying. If the detail calls for a membrane cast against fresh concrete rather than applied to cured slabs, a pre-applied product is the correct pick instead of this post-applied sheet. Across our other brands, Space Arc supplies Fosroc, Dr. Fixit and STP alternatives for below-ground tanking, and our team can match the right membrane, primer and protection layer to the water table and site constraints on your project.
Fosroc Proofex Engage — Choose Proofex Engage when the design calls for a pre-applied, mechanically bonded HDPE membrane cast against fresh concrete rather than a post-applied self-adhesive sheet on cured slabs.
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Authorised distribution, technical advice & professional application across Delhi NCR and Pan-India.