--- title: "Concrete vs Hydrocarbons: Getting Both the Specification and Waterproofing Membrane Placement Right" description: "We have been asked several times recently: Where should the membrane go, and is the concrete beneath it adequately protected? All will be revealed..." image: https://insights.premcrete.com/hubfs/pic5.jpg --- #### Insights # Concrete vs Hydrocarbons: Getting Both the Specification and Waterproofing Membrane Placement Right - - - - [mailto:?subject=Check%20out%20this%20article:%20concrete-vs-hydrocarbons-getting-both-the-specification-and-waterproofing-membrane-placement-right](mailto:?subject=Check%20out%20this%20article:%20concrete-vs-hydrocarbons-getting-both-the-specification-and-waterproofing-membrane-placement-right) - Michaela Rowland | June 18, 2025 When designing substructures on contaminated ground—particularly sites with elevated **hydrocarbon levels** such as petrol, diesel, or solvents—there’s a critical decision to be made that often gets overlooked: **Where should the membrane go—and is the concrete beneath it adequately protected?** At Premcrete, our default recommendation is to specify a [pre-applied membrane ](https://premcrete.com/waterproofing-membranes/)**or hydrocarbon-resistant DPM beneath the slab**, ensuring aggressive contaminants stay away from the concrete. However, many clients prefer to place the membrane **above the slab** for sequencing or practicality reasons. That choice brings real risk: If the membrane is above, **the concrete beneath is directly exposed to hydrocarbons**—and unless it’s correctly specified, **long-term degradation will follow**. ![Waterproofing Membrane Application](https://insights.premcrete.com/hs-fs/hubfs/pic5.jpg?width=612&height=612&name=pic5.jpg) ## When Are Hydrocarbons Considered Aggressive?  Hydrocarbons only become problematic at certain concentrations in soil or groundwater. Common **TPH (Total Petroleum Hydrocarbons)** thresholds are: - ~1,000 mg/kg for **weathered petrol** - ~2,000 mg/kg for **diesel or light oils** - ~2,000–4,000 mg/kg for **heavy/mineral oils** At or above these levels, expect: - Free-phase hydrocarbon presence - VOC vapours - Direct chemical attack on concrete That's why you must review your SI report and consult the geotechnical/environmental engineer, confirming whether hydrocarbons or VOCs exceed these thresholds is the first line of defence.  ## Concrete Alone Isn't Enough  If the waterproofing membrane is placed above the slab, the slab itself must be chemically resistant.  **Recommended Concrete Specification** Your concrete must meet: - **Strength class**: C40/50 - **Chemical resistance**: DC-4 (D40) per **BS 8500‑1 Table A.1** - **Max w/c ratio**: 0.45 - **Minimum cement content**: 400 kg/m³ **Key point:** Strength (C40) ≠ Chemical resistance (D40). You need *both*. ## Premcrete Systems for Full Protection  To protect concrete from hydrocarbons, VOCs, gas, and water, we recommend an integrated system: [**Combiseal Plus™ – *Self‑healing, pre‑applied waterproofing***](https://premcrete.com/products/combi-seal-plus/) - HDPE membrane with non‑woven geotextile - Combines **self-healing** and **fully bonded** protection - Ideal for **basements**, **lift pits**, and **below-ground applications** [**Hydroprufe 6000™**](https://premcrete.com/products/hydroprufe-6000/) - High-density polyethylene DPM - Resistant to **gases**, **VOCs**, and **hydrocarbons** [**Hydroprufe LG™**](https://premcrete.com/products/hydroprufe-lg-5ltr/) - Two-part **liquid epoxy gas membrane** - Perfect for **complex details, upstands, pile heads, pile caps**, and avoids the need to wrap pile caps [**Twinseal GR™**](https://premcrete.com/products/twinseal-compound-gr/) - Two-component sealing compound - Provides flexible, durable protection at **joints, penetrations, and interfaces** [Hydroplug™ –](https://premcrete.com/products/hydroplug/) ***Tri-component penetration sealing system*** - Polyester fibre-reinforced foam + hybrid putty + waterproof mortar - Non‑flammable, solvent‑free, seals water, gas, VOCs and hydrocarbons ![Hydroprufe](https://insights.premcrete.com/hs-fs/hubfs/Hydroprufe.jpg?width=430&height=645&name=Hydroprufe.jpg) ## Spec & System Checklist  1. Check **SI report** and confirm TPH/VOC levels with engineers. 2. If the membrane is **above the slab**, specify **C40/50 + D40** concrete. 3. Install **Combiseal Plus™** or **Hydroprufe**** 6000****™** beneath the slab for belt-and-braces protection. 4. Use **Hydroprufe**** LG****™** on upstands, pile heads, pile caps and complex detail areas—no wrapping required. 5. Seal interfaces with **Twinseal**** GR****™** and service penetrations with **Hydroplug™**. ## Final Take  Hydrocarbons aren't just a [membrane](https://premcrete.com/waterproofing-membranes/) concern—they can degrade concrete if not properly specified and protected. Protecting the slab **from below** using products like **Combiseal Plus** offers the best assurance. If site constraints force the membrane **above**, upgrading the concrete to **D40** and integrating the right product stack from Premcrete is essential. Let our technical team help you design a fully compliant, hydrocarbon-resilient substructure. We can deliver full spec packs, NBS clauses and submittal documents on request: [technical@premcrete.com](mailto:technical@premcrete.com)  [facebook-f icon ](https://www.facebook.com/profile.php?id=61556750189067) [youtube icon ](https://www.youtube.com/@premcreteltd/videos) [linkedin icon ](https://www.linkedin.com/company/premcrete-ltd/) ### Posts By Topics - [Insights (48)](https://insights.premcrete.com/tag/insights) - [Structural Waterproofing (11)](https://insights.premcrete.com/tag/structural-waterproofing) - [Gas protection systems (7)](https://insights.premcrete.com/tag/gas-protection-systems) - [Waterproofing membranes (4)](https://insights.premcrete.com/tag/waterproofing-membranes) - [waterproofing (4)](https://insights.premcrete.com/tag/waterproofing) - [Ground heave solutions (3)](https://insights.premcrete.com/tag/ground-heave-solutions) - [Civil Infrastructure Repair (1)](https://insights.premcrete.com/tag/civil-infrastructure-repair) [see all](https://insights.premcrete.com/concrete-vs-hydrocarbons-getting-both-the-specification-and-waterproofing-membrane-placement-right#) ### Latest articles [AI & Digital Twins: Inside The Shift Towards Smarter Basement Waterproofing Design](https://insights.premcrete.com/ai-digital-twins-inside-the-shift-towards-smarter-basement-waterproofing-design) [Understanding Waterproofing Compliance: Testing, Certification and Design Responsibility](https://insights.premcrete.com/understanding-waterproofing-compliance-testing-certification-and-design-responsibility) [How to Make Concrete Waterproof in Civil Engineering Projects](https://insights.premcrete.com/how-to-make-concrete-waterproof-in-civil-engineering-projects) [Introducing Premtrac 2.0: Built for Compliance, Built for Confidence](https://insights.premcrete.com/introducing-premtrac-2.0-built-for-compliance-built-for-confidence) [Retrofit Basement Waterproofing: Bringing Modern Protection to Older Structures](https://insights.premcrete.com/retrofit-basement-waterproofing-bringing-modern-protection-to-older-structures) ### Subscribe to our blog This is a search field with an auto-suggest feature attached. - There are no suggestions because the search field is empty. ## More Insights [![Understanding Waterproofing Compliance: Testing, Certification and Design Responsibility](https://insights.premcrete.com/hubfs/Premcrete%20Images-303.jpg) ](https://insights.premcrete.com/understanding-waterproofing-compliance-testing-certification-and-design-responsibility) ## [Understanding Waterproofing Compliance: Testing, Certification and Design Responsibility](https://insights.premcrete.com/understanding-waterproofing-compliance-testing-certification-and-design-responsibility) [Read more](https://insights.premcrete.com/understanding-waterproofing-compliance-testing-certification-and-design-responsibility) [![How to Make Concrete Waterproof in Civil Engineering Projects](https://insights.premcrete.com/hubfs/Premcrete%20Images-234.jpg) ](https://insights.premcrete.com/how-to-make-concrete-waterproof-in-civil-engineering-projects) ## [How to Make Concrete Waterproof in Civil Engineering Projects](https://insights.premcrete.com/how-to-make-concrete-waterproof-in-civil-engineering-projects) [Read more](https://insights.premcrete.com/how-to-make-concrete-waterproof-in-civil-engineering-projects) [![Introducing Premtrac 2.0: Built for Compliance, Built for Confidence](https://insights.premcrete.com/hubfs/image002.jpg) ](https://insights.premcrete.com/introducing-premtrac-2.0-built-for-compliance-built-for-confidence) ## [Introducing Premtrac 2.0: Built for Compliance, Built for Confidence](https://insights.premcrete.com/introducing-premtrac-2.0-built-for-compliance-built-for-confidence) [Read more](https://insights.premcrete.com/introducing-premtrac-2.0-built-for-compliance-built-for-confidence) [![Retrofit Basement Waterproofing: Bringing Modern Protection to Older Structures](https://insights.premcrete.com/hubfs/Taxi%20House-9.jpg) ](https://insights.premcrete.com/retrofit-basement-waterproofing-bringing-modern-protection-to-older-structures) ## [Retrofit Basement Waterproofing: Bringing Modern Protection to Older Structures](https://insights.premcrete.com/retrofit-basement-waterproofing-bringing-modern-protection-to-older-structures) [Read more](https://insights.premcrete.com/retrofit-basement-waterproofing-bringing-modern-protection-to-older-structures) [![The Future of Waterproofing Isn’t Passive. 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