A few months back, a civil engineer friend of mine from Karachi called me with an interesting question. He had just received a project specification from an architect that called for a "polystyrene bituminous membrane" on a basement waterproofing project. He had worked with standard torch-on membranes for years but hadn't specifically used a polystyrene-reinforced variant before.
Qaisar Abbas
Certified Roof Waterproofing and Heat Proofing Specialist
With over 12 years of professional experience in waterproofing solutions, roof leak repair, and moisture protection, Qaisar Abbas has helped thousands of homeowners, commercial property owners, and industrial clients protect their buildings from water damage across Pakistan. His expertise includes roof waterproofing, basement waterproofing, bathroom waterproofing, foundation waterproofing, polyurethane membrane applications, bituminous membrane installation, and long-lasting leak prevention systems using high-quality waterproofing chemicals and industry-approved application techniques.
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"Bhai, yeh polystyrene wali membrane kya hoti hai? Kya yeh normal membrane sey different hai?" he asked.
(Brother, what is this polystyrene membrane? Is it different from a regular membrane?)
That conversation became the inspiration for this article. Because if an experienced civil engineer has this question, I am certain that thousands of homeowners, contractors, and property developers across Pakistan are wondering the same thing — especially when they encounter brand names like Highgrip and Hygrip in product catalogs and supplier lists.
This guide will explain everything clearly — what polystyrene bituminous membrane actually is, how it differs from standard bituminous membranes, what Highgrip and Hygrip products offer, and where you can source these materials in Pakistan. We will also explain how Hazir Pakistan can help you with professional installation and guidance.
What is Polystyrene Bituminous Membrane?
To understand polystyrene bituminous membrane, let's first recall the basic structure of a standard bituminous membrane. Every bituminous membrane has three essential components:
- Bitumen layers (top and bottom) — the waterproofing material
- Polymer modifier (APP or SBS) — enhances bitumen properties
- Reinforcement core — provides structural strength
In standard membranes, the reinforcement core is typically:
- Polyester non-woven fabric — flexible and strong
- Fiberglass mat — dimensionally stable
- Composite (polyester + fiberglass) — combines both properties
A polystyrene bituminous membrane introduces expanded polystyrene (EPS) — the lightweight foam material commonly used for thermal insulation in construction — as an additional functional layer within or adjacent to the membrane system.
How Polystyrene is Incorporated
There are two main ways polystyrene is used in polystyrene bituminous membrane systems:
Method 1 — Polystyrene as Thermal Insulation Layer:
In this configuration, a layer of expanded polystyrene (EPS) board is incorporated into the roof assembly as part of a complete waterproofing and insulation system. The bituminous membrane provides waterproofing, while the polystyrene layer provides thermal insulation. These two layers work together as a unified system rather than independent applications.
This is particularly relevant in Pakistani construction because:
- Roof insulation reduces heat transfer into the building, lowering cooling costs dramatically
- In cities like Karachi and Multan where air conditioning runs for 8-10 months a year, thermal insulation on the roof provides significant energy savings
- The polystyrene layer also provides some protection to the waterproofing membrane from the extreme thermal cycling Pakistani roofs experience
Method 2 — EPS-Backed Membrane:
Some specialized membranes are manufactured with a thin layer of EPS foam factory-bonded to the underside of the bituminous membrane. This EPS backing serves multiple purposes:
- Acts as a thermal break
- Provides cushioning that allows the membrane to accommodate minor surface irregularities
- Helps with installation on rough or uneven surfaces
- Adds some compressive strength resistance
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What Makes Polystyrene Bituminous Membrane Special?
The combination of waterproofing and thermal insulation in a single, coordinated system offers significant advantages:
Thermal Performance:
Standard flat roofs in Pakistan are terrible thermal performers. The black bitumen surface absorbs solar heat, the concrete conducts it into the building, and the rooms below become ovens. A polystyrene insulation layer (typically 25-75mm thick EPS board) dramatically reduces this heat transfer, keeping upper-floor rooms significantly cooler.
Single-System Coordination:
When waterproofing and insulation are designed as a system, there are no compatibility issues between materials. The layers are specified to work together, with compatible adhesives and installation methods.
Moisture Control:
Polystyrene is a closed-cell material — it does not absorb water. Unlike some other insulation materials, EPS retains its thermal performance even if it comes into contact with moisture. This makes it ideal for use adjacent to waterproofing layers.
Cost-Effectiveness:
A properly designed polystyrene bituminous membrane system costs more upfront than standard waterproofing alone, but the energy savings from improved roof insulation often recoup this additional investment within 3-5 years in Pakistani conditions.
Highgrip Polystyrene Bituminous Membrane Features
Highgrip is a brand name that appears in Pakistan's waterproofing material market, associated with polystyrene bituminous membrane products. Here's what is generally known about Highgrip polystyrene bituminous membrane products and their features:
Product Overview
Highgrip polystyrene bituminous membrane high grip products are positioned in the market as complete waterproofing solutions that combine the proven performance of modified bituminous membrane with the thermal benefits of polystyrene insulation.
Key Features
1. Combined Waterproofing and Insulation
The primary distinguishing feature of Highgrip polystyrene bituminous membrane is the integration of EPS insulation with APP or SBS modified bituminous membrane. This eliminates the need for separately sourcing and installing two different systems.
2. High Grip Surface Texture
The "high grip" designation refers to the surface texture on some variants — a textured or granulated surface that provides better grip for workers walking on the installed membrane before the protection layer is applied. This reduces the risk of slipping during installation on sloped or smooth membrane surfaces.
3. Modified Bitumen Performance
The bituminous component follows the same APP or SBS modification technology used in standard membranes:
- Heat resistance up to 140°C+ (APP variants)
- Flexibility in cold temperatures (SBS variants)
- Polyester or fiberglass reinforcement for tensile strength
- Torch-on installation compatibility
4. EPS Insulation Specifications
The polystyrene component typically features:
- Density: 15-25 kg/m³ (standard EPS) to 30-40 kg/m³ (high-density EPS for load-bearing applications)
- Thermal conductivity: approximately 0.032-0.038 W/mK
- Compressive strength varies by density grade
- Thickness options typically from 25mm to 75mm depending on thermal requirements
5. Dimensional Stability
EPS is dimensionally stable — it doesn't shrink, swell, or warp under normal building conditions. This stability helps maintain the integrity of the complete waterproofing assembly.
6. Lightweight
Despite the added insulation layer, polystyrene bituminous membrane systems remain lightweight compared to alternatives like foam concrete insulation, minimizing additional structural load on the roof slab.
Applications for Highgrip Products
- Flat residential rooftops requiring both waterproofing and thermal comfort improvement
- Commercial building roofs where energy efficiency targets must be met
- Industrial buildings with large roof areas where cumulative energy savings are significant
- Renovation projects where improved thermal performance is a priority alongside waterproofing
Hygrip Bituminous Waterproofing Membranes Review
Hygrip is another product name that comes up in discussions about bituminous waterproofing membranes in the Pakistani market. Let me give you an honest, balanced review based on available information and market feedback.
What is Hygrip?
Hygrip bituminous waterproofing membranes are modified bituminous membrane products available in the Pakistani market. The "Hygrip" name suggests focus on adhesion performance — the "grip" component of the name indicates emphasis on the membrane's bonding characteristics.
Product Range
Hygrip products in the Pakistani market generally include:
Standard Torch-On Membranes:
APP modified bituminous membranes for general roofing and waterproofing applications. Available in standard thicknesses (3mm, 4mm) with polyester reinforcement.
Polystyrene-Combined Systems:
Similar to Highgrip, some Hygrip product lines include combined membrane and EPS insulation systems for complete roof waterproofing with thermal protection.
Self-Adhesive Variants:
Some Hygrip products are available in self-adhesive configuration for applications where torch installation is not suitable.
Performance Assessment
Waterproofing Effectiveness:
Based on market feedback and contractor reports across Pakistan, Hygrip bituminous waterproofing membranes perform adequately when installed correctly. Like all bituminous membranes, the performance depends heavily on:
- Correct surface preparation
- Proper primer application
- Correct torch technique (for torch-on variants)
- Adequate overlap sealing
- Proper flashing at detail areas
Heat Resistance:
APP-modified Hygrip membranes show acceptable heat resistance for Pakistani summer conditions. The APP modification provides sufficient softening point for most Pakistani climate zones.
Availability:
Hygrip products are available through waterproofing material suppliers in major Pakistani cities, with stronger availability in Karachi compared to other cities.
Honest Assessment from Hazir Pakistan
At Hazir Pakistan, we maintain a brand-neutral position — we work with multiple product brands and select based on project requirements, client specifications, and verified product quality.
Our honest assessment of products like Hygrip:
Positives:
- Available in the Pakistani market
- Follows standard modified bituminous membrane technology
- Offers combined waterproofing and insulation options
- Price point is generally accessible for Pakistani market
Important Considerations:
- Product quality should always be verified by requesting the manufacturer's technical data sheet before purchase
- Purchase from authorized distributors only to ensure genuine product
- As with any membrane product, performance is only as good as the installation workmanship
- We always recommend conducting a small test application and checking adhesion quality before committing to large-quantity purchase for a major project
Specifications & Data Sheet
When evaluating any polystyrene bituminous membrane product — whether Highgrip, Hygrip, or any other brand — here are the key specifications to request and verify:
Bituminous Membrane Layer Specifications
| Property | Typical Specification | Test Standard |
|---|---|---|
| Nominal Thickness | 3mm / 4mm / 5mm | EN 1849-1 |
| Mass Per Unit Area | 3.5 – 6.5 kg/m² | EN 1849-1 |
| Softening Point (APP) | ≥ 130°C | EN 1109 |
| Cold Flexibility (SBS) | ≤ -10°C | EN 1109 |
| Tensile Strength (Long.) | ≥ 800 N/50mm | EN 12311-1 |
| Tensile Strength (Trans.) | ≥ 700 N/50mm | EN 12311-1 |
| Elongation at Break | ≥ 40% (Polyester) | EN 12311-1 |
| Watertightness | Pass at 60 kPa | EN 1928 |
| Heat Resistance | No flow at 100°C | EN 1110 |
| Reinforcement Type | Polyester / Fiberglass | – |
| Roll Width | 1.0 meter | – |
| Roll Length | 10 meters | – |
Polystyrene Insulation Layer Specifications
| Property | Standard Grade | High-Density Grade |
|---|---|---|
| Material Type | EPS (Expanded Polystyrene) | EPS (Expanded Polystyrene) |
| Density | 15-20 kg/m³ | 30-40 kg/m³ |
| Thermal Conductivity | 0.036-0.040 W/mK | 0.032-0.035 W/mK |
| Compressive Strength | ≥ 60 kPa | ≥ 150 kPa |
| Water Absorption | ≤ 3% by volume | ≤ 2% by volume |
| Thickness Options | 25mm, 40mm, 50mm | 50mm, 75mm, 100mm |
| Dimensional Stability | ≤ 0.3% linear | ≤ 0.2% linear |
System Installation Specifications
| Specification | Requirement |
|---|---|
| Primer Coverage | 3-4 m² per liter |
| Primer Drying Time | 4-8 hours (ambient) |
| Side Lap Overlap | Minimum 100mm |
| End Lap Overlap | Minimum 150mm |
| Parapet Turn-Up | Minimum 300mm |
| Protection Screed | 50-75mm cement sand |
| Minimum Application Temperature | 5°C ambient |
| Maximum Application Temperature | 45°C ambient |
What to Request from Suppliers
When approaching any supplier for polystyrene bituminous membrane products in Pakistan, always request:
- Technical Data Sheet (TDS) — complete physical and mechanical properties
- Safety Data Sheet (SDS) — handling and safety information
- Manufacturer's Application Guide — installation instructions
- Third-party test reports — independent verification of properties
- Warranty documentation — product warranty terms
- Reference project list — confirmed successful applications
Where to Buy – Contact Information for Pakistan
Finding quality polystyrene bituminous membrane products and connecting with reliable suppliers in Pakistan requires knowing where to look. Here's a practical guide:
Karachi
Karachi is Pakistan's largest commercial hub and has the most developed market for waterproofing materials including polystyrene bituminous membrane products.
Key Areas to Find Suppliers:
- SITE Industrial Area — several waterproofing material importers and distributors are based here
- Korangi Industrial Area — manufacturers and large-scale distributors
- Landhi Industrial Area — building materials wholesale market
- M.A. Jinnah Road / Bolton Market — general building materials including waterproofing products
For Hygrip Bituminous Waterproofing Membranes Contact Number Karachi:
Rather than listing potentially outdated phone numbers that may change, we recommend:
- Searching Google for "Hygrip waterproofing membrane Karachi" for current supplier listings
- Contacting Hazir Pakistan directly — we work with verified suppliers across Karachi and can connect you with the right source for your project
- Visiting the SITE or Korangi industrial areas and asking for waterproofing membrane suppliers
Hazir Pakistan's Karachi Network:
We have established relationships with quality material suppliers across Karachi. When you hire Hazir Pakistan for your waterproofing project, we source materials from verified, trusted suppliers — removing the risk of purchasing substandard or counterfeit products from unreliable sources.
Lahore
Lahore's building materials market has grown significantly with the city's construction boom.
Key Areas:
- Ferozepur Road — large building materials market with several waterproofing material dealers
- Multan Road Industrial Area — manufacturers and distributors
- Township — wholesale building materials
- Badami Bagh — traditional building materials market
For Lahore Sourcing:
Contact Hazir Pakistan's Lahore team for current supplier recommendations and product availability information.
Islamabad / Rawalpindi
- I-9 Industrial Area, Islamabad — industrial suppliers including waterproofing materials
- Chaklala Scheme, Rawalpindi — building materials market
- Peshawar Road, Rawalpindi — hardware and construction materials
Faisalabad, Multan, Peshawar, Quetta
In secondary cities, polystyrene bituminous membrane products may have limited direct availability. Materials are typically supplied from Karachi or Lahore through local building material dealers. Lead time for procurement should be factored into project scheduling.
Why Sourcing Through Hazir Pakistan is Better
We understand that sourcing the right product at the right price from a reliable supplier is genuinely difficult in Pakistan's fragmented building materials market. Counterfeit membranes, substandard products, and misrepresented specifications are real problems.
When you work with Hazir Pakistan:
✅ We source from verified suppliers with documented product authenticity
✅ We check every roll before it goes onto your roof
✅ We request and verify technical data sheets for every product batch
✅ We take full responsibility for material quality as part of our service warranty
✅ You don't deal with suppliers — we manage the entire supply chain for you
This means you get peace of mind that the membrane on your roof is exactly what it's supposed to be — genuine, quality-certified, and correctly specified for your project.
FAQs About Polystyrene Bituminous Membrane, Highgrip & Hygrip
What is the main advantage of polystyrene bituminous membrane over standard membrane?
A polystyrene bituminous membrane system adds a layer of EPS insulation that significantly reduces heat transfer through the roof — a major benefit in Pakistan's hot climate where roof heat gain is a serious problem. This leads to cooler upper-floor rooms and lower air conditioning costs.
Is Highgrip polystyrene bituminous membrane suitable for Karachi's climate?
The polystyrene insulation layer additionally helps moderate the temperature variation that the membrane experiences, potentially extending its service life.
How do I verify if a Hygrip product I'm buying is genuine?
Purchase only from authorized distributors
Request the technical data sheet and compare it with manufacturer documentation
Check roll markings — genuine rolls have manufacturer name, product code, and production date printed on them
If possible, request a certificate of conformity from the supplier
Contact Hazir Pakistan — we can help you assess product authenticity before purchase
Can polystyrene bituminous membrane be used for basement waterproofing?
Consult with Hazir Pakistan for the correct specification for your basement project.
What thickness of polystyrene insulation is recommended for Pakistani roofs?
For northern cities with cold winters (Islamabad, Peshawar, Quetta), the insulation also helps retain indoor heat in winter, so 50-100mm may be specified. The exact thickness should be calculated based on the building's energy efficiency requirements and the thermal resistance value (R-value) specified in the design.
Does polystyrene bituminous membrane cost significantly more than standard membrane?
In Pakistan, where cooling costs are substantial and electricity prices continue rising, improved roof insulation can generate monthly savings that make the payback period relatively short — typically 3-7 years depending on building size and cooling load. Over a 20-year building life, the insulated system is often more economical.
How do I contact Hazir Pakistan for polystyrene membrane installation?
Our website contact form
Phone and WhatsApp (contact details on our website)
Google Business profile — search "Hazir Pakistan Waterproofing" on Google Maps
Can I install polystyrene bituminous membrane myself?
Professional installation by Hazir Pakistan ensures correct sequencing, proper adhesive use between layers, and quality-controlled torch application.
Are Hygrip and Highgrip the same product?
Always verify the specific product specifications for whichever brand you are considering, and ensure the product meets your project requirements regardless of brand name.
What is the lifespan of a polystyrene bituminous membrane system?
So in terms of longevity, the complete polystyrene bituminous membrane system represents an excellent long-term investment.
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We serve all major cities across Pakistan and offer free site inspections and consultations. Our team will assess your specific requirements and recommend the most appropriate membrane system — whether that's standard modified bituminous membrane, polystyrene bituminous membrane, or another solution entirely.
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Choose Hazir Pakistan for Expert Guidance and Installation
Navigating the Pakistani waterproofing materials market — with its mix of imported products, local manufacturers, varying quality standards, and brand claims — can be genuinely overwhelming. Products like polystyrene bituminous membrane, Highgrip, and Hygrip add another layer of complexity for homeowners and contractors unfamiliar with these specific products.
This is where Hazir Pakistan makes a real difference.
We take the complexity away from you. We know the products, the suppliers, the specifications, and the installation techniques. We have the experience to recommend the right system for your specific building, location, and budget — and the skill to install it correctly.
What you get when you choose Hazir Pakistan:
✅ Honest product recommendation based on your actual needs
✅ Material sourcing from verified, trusted suppliers
✅ Professional installation by trained, experienced applicators
✅ Quality control at every stage of the project
✅ Mandatory water ponding test before project handover
✅ Written warranty and complete project documentation
✅ After-sales support and maintenance guidance
📞 Contact Hazir Pakistan today for a free consultation and site inspection.
Whether you're in Karachi looking for hygrip bituminous waterproofing membranes contact number Karachi, or in any other city across Pakistan searching for quality polystyrene membrane installation — Hazir Pakistan is your answer.
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