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Delta MS 500 Fire Retardant is an 8 mm studded, high-density polyethylene (HDPE) Type C cavity-drainage membrane. Delta reports a B-S2, d0 reaction-to-fire classification to EN 13501-1:2018, but that product rating is not a blanket approval for every finished wall or basement assembly. Specify it as one part of a designed waterproofing system—with a specialist survey, sealed joints and fixings, a defined drainage route, inspection access, maintenance provisions and a project-specific fire review.
The critical design decision is whether Type C drained protection satisfies the project’s water-resistance grade. Under BBA Agrément Certificate 00/3742, Product Sheet 7, where Grade 3 protection is required and a below-ground wall retains more than 600 mm, Delta MS 500 Fire must be combined with Type A or Type B waterproofing. That condition should appear in the specification whenever it applies.
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What is Delta MS 500 Fire Retardant?
Delta MS 500 Fire Retardant (product code DMS 850) is a studded HDPE membrane used as Type C drained protection in below-ground construction. The membrane forms a cavity on the internal side of the structure. Water is managed within that cavity and directed to channels, gullies or a sump rather than being expected to be stopped solely at the external face.
Delta’s description of Type C, in the context of BS 8102:2022, is “drained protection”: the structure provides primary resistance to water penetration and a drained cavity is incorporated within the basement. This is a system principle, not a promise that the membrane itself makes a wall watertight. The design must therefore address the structure, cavity, joints, drainage and access together.
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The manufacturer’s product information and August 2023 data sheet identify the following published characteristics:
| Item | Published information |
|---|---|
| Product | Delta MS 500 Fire Retardant (DMS 850) |
| Waterproofing principle | Type C drained cavity protection |
| Material | High-density polyethylene (HDPE) |
| Sheet thickness | 0.5 mm |
| Stud height | 8 mm |
| Roll size | 2.4 m × 20 m |
| Compressive strength | Greater than 250 kN/m² |
| Reaction to fire | B-S2, d0 to EN 13501-1:2018, as reported by Delta |
| Drainage capacity | 2.25, with the supplied sheet reporting the unit as L/s per m²; verify the current data sheet and reproduce its unit exactly in the contract specification |
Use the exact product name and code in drawings, schedules, submittals, substitution requests and inspection records. Do not allow “MS 500” alone to identify the fire-retardant version.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallHow does a Type C membrane manage water?
A Type C system accepts that water may reach the structure and provides a controlled path for it to drain. The building structure remains the primary barrier; the membrane creates a cavity that carries residual or infiltrating water to collection points. Pumps, sumps, channels and gullies are not optional accessories when the design needs them—they are part of the water-management strategy.
The BBA certificate requires joints and fixings to be sealed with compatible Delta sealing products. It also calls for channels or gullies, or sumps and pumps, as necessary to disperse excess or standing water. A membrane schedule that omits the discharge route, power requirements, pump duty, alarm arrangement or maintenance access is incomplete.
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How do I specify the system step by step?
Start with the building’s water, fire and maintenance requirements, then name the membrane and every component needed to make the Type C system function.
- Establish the design conditions. Record the basement geometry, retained-ground heights, wall and slab construction, joints, penetrations, movement expectations, groundwater conditions and intended internal environment. In existing or damp structures, commission a full survey by a specialist waterproofing surveyor. The survey should identify active ingress, defects and external causes such as defective drainage before the cavity system is selected.
- Set the required water-resistance grade. State the target grade under the project’s interpretation of BS 8102:2022 and the consequences of any water reaching the cavity. Confirm whether the accommodation demands Grade 3 conditions. If so, check the 600 mm retained-ground rule before accepting Type C alone.
- Define the fire requirement. State that the specified product is Delta MS 500 Fire Retardant, DMS 850, with the manufacturer-reported B-S2, d0 classification to EN 13501-1:2018. Identify where the membrane sits in the wall build-up, the lining or finish over it, fire-stopping at penetrations and any compartmentation requirements. Ask the project fire engineer or building-control authority whether evidence for the complete assembly is required.
- Write a complete component schedule. Include the membrane, compatible sealing products, fixing plugs, tapes, drainage channels or gullies, sump and pump equipment where required, access covers, alarms, backup power and discharge connections. Delta identifies Delta Fire Retardant Ultra Fix plugs and fire-retardant fleece tape as associated tested components. The Ultra Fix page identifies plug DMS 051, a 9 mm shank, 52 mm size and 200-piece box; verify current compatibility and quantities against the live product documents.
- Detail junctions and penetrations. Show how sheets overlap, terminate at floors and ceilings, turn around corners, meet movement joints and seal around pipes, cables and structural projections. Require sealed fixings and joints using the manufacturer’s specified products. Coordinate the membrane with any internal lining so later trades cannot puncture or bridge the drainage cavity.
- Design the drainage route. Draw the path from every low point to a channel, gully or sump. Size collection and pumping equipment for the site’s assessed inflow, provide safe access for inspection and cleaning, and coordinate the final discharge point. Where pumps are used, specify alarms, electrical resilience and a maintenance regime appropriate to the building’s risk profile.
- Apply the Grade 3 combined-protection rule where relevant. The BBA certificate states: “Where Grade 3 waterproofing protection is required, and the below-ground wall retains more than 600 mm (measured from the top of the retained ground to the lowest finished floor level), the system must be used in combination with either a Type A or B waterproofing protection.” Put this requirement on the waterproofing drawings and responsibility matrix, not only in a general note.
- Set installation and inspection requirements. Require installation in accordance with the current BBA certificate and manufacturer’s instructions. Inspect the substrate, sheet continuity, overlaps, sealed fixings, corners, penetrations, drainage connections and pump access before closing the lining. Photograph concealed work and retain product batch information, installer records and any approved deviations.
- Confirm competent procurement and responsibility. Delta says the system is available through its Registered Installer Network. Confirm the installer’s status, who owns the waterproofing design, who signs off fire interfaces and who will maintain the drainage equipment. Obtain the current data sheet and certificate revision at tender and again before installation.
What does the B-S2, d0 fire classification mean?
Under EN 13501-1:2018, B is the reported Euroclass reaction-to-fire class, S2 is the smoke-production class and d0 indicates no flaming droplets or particles under the classification test. Delta reports this result for MS 500 Fire Retardant on its product page and data sheet.
The classification is a property of the tested product under the stated assessment. It does not automatically establish the performance of a complete basement wall, adhesive, lining, insulation build-up or fire-stopping detail. Confirm the applicable national building regulations, the location of the membrane, the project fire strategy and whether an assembly assessment is needed.
Do not confuse the fire-retardant product with standard Delta MS 500. Delta’s separate standard-product information reports Class E, while the fire-retardant product is reported as B-S2, d0. Substitutions, drawings and delivery tickets should identify the fire-retardant product by its full name and code.
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When must Type C protection be combined with Type A or Type B?
The specific BBA condition is triggered when both factors apply: the project requires Grade 3 waterproofing protection, and the below-ground wall retains more than 600 mm measured from the top of retained ground to the lowest finished floor level. In that situation, Delta MS 500 Fire must be combined with Type A or Type B waterproofing protection.
Type A is barrier protection, Type B is structurally integral protection and Type C is drained protection. The choice is not a ranking exercise: it depends on groundwater, structural form, defects, access, maintainability, fire requirements and the consequences of leakage. Record the selected combination and the designer responsible for each layer.
How should Type A, Type B and Type C options be compared?
| Decision axis | Questions for the design team |
|---|---|
| Water-management principle | Does the approach block water, make the structure itself resistant, or collect and drain water in a cavity? |
| Required grade | What water-resistance grade is required, and does the 600 mm retained-ground condition impose combined protection? |
| Fire evidence | What classification applies to the product, and is evidence required for the finished assembly rather than the membrane alone? |
| Drainage and maintenance | Where do channels, gullies or sumps discharge, and can pumps and alarms be inspected and serviced? |
| Substrate and movement | Can the existing structure, joints and penetrations support the proposed method without leaving untreated defects? |
| Certification and competence | Does the certificate cover the intended use and components, and is a competent specialist responsible for the installation? |
These axes support a project decision; the available evidence does not establish one universal “best” waterproofing type.
What drainage and maintenance provisions are easy to miss?
Designers often specify the membrane but leave the water-disposal details to site. That reverses the correct order. A Type C cavity needs a continuous route to collection points, sealed transitions and access for clearing debris. Sumps should be reachable without dismantling permanent finishes, and pump controls should expose fault and high-water conditions.
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Include a handover plan showing channels, gullies, sumps, pumps, isolation points, alarms, discharge routes and cleaning intervals. The building owner should receive as-built photographs and instructions for responding to a pump failure or unexpected water accumulation. Maintenance access is part of waterproofing performance, not a post-completion convenience.
What are the most common specification mistakes?
- Calling it waterproofing without naming the principle. Correct the wording to “Type C drained cavity protection” and describe the structure’s role.
- Using the wrong product name. Replace “MS 500” with “Delta MS 500 Fire Retardant (DMS 850)” and retain the B-S2, d0 requirement.
- Treating B-S2, d0 as whole-wall approval. Obtain project-specific fire advice for linings, penetrations and the completed assembly.
- Omitting drainage equipment. Add channels, gullies or sump-and-pump provisions wherever the survey and design require them.
- Ignoring the Grade 3 threshold. Check retained-ground height from the stated reference points and add Type A or Type B protection when the BBA condition applies.
- Allowing unsealed penetrations or incompatible fixings. Require the manufacturer’s compatible sealing products and inspect before concealment.
- Relying on an old document. The supplied data sheet is dated August 2023. Check the live data sheet, BBA certificate revision, local regulations and fire strategy before tender and installation.
- Leaving responsibility unclear. Name the waterproofing designer, specialist installer, fire consultant and maintenance owner in the project responsibility matrix.
What should be checked before procurement and installation?
Use this short review before issuing the waterproofing package:
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- Published dimensions and performance values match the current manufacturer documentation.
- B-S2, d0 is stated as a product reaction-to-fire classification to EN 13501-1:2018, with assembly requirements separately addressed.
- A specialist survey has recorded ingress, defects, groundwater conditions and retained-ground heights.
- The required water-resistance grade is explicit.
- The 600 mm Grade 3 condition has been checked.
- Membrane joints, fixings, corners and penetrations have compatible sealing details.
- Drainage channels, gullies, sumps, pumps, alarms, discharge and maintenance access are drawn and scheduled.
- The installer’s competence and Delta Registered Installer Network status have been confirmed where applicable.
- Inspection, testing, photographs, as-built drawings and handover maintenance instructions are contract requirements.
How we selected the specification criteria
The criteria above follow the evidence in Delta’s product data, its explanation of Type C structural waterproofing, and BBA Agrément Certificate 00/3742, Product Sheet 7: product identity and fire class; dimensional and mechanical performance; certificate scope; drainage and sealing requirements; specialist surveying; Grade 3 limitations; and installer and maintenance responsibilities. They are design checks, not results from independent site testing.
What is the practical specification outcome?
Specify Delta MS 500 Fire Retardant as a component of a coordinated Type C system, not as a standalone sheet. The contract documents should define the required grade, fire strategy, compatible components, drainage route, access and maintenance, then state when Type A or Type B protection is also required. Before construction, reconcile the current manufacturer documents and BBA certificate with local regulations and the project’s specialist waterproofing and fire advice.
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Frequently Asked Questions
Can Delta MS 500 Fire Retardant be used without a sump pump?
Sometimes, but only where the designed drainage route can discharge water through channels or gullies without a sump. The BBA certificate requires channels, gullies or sumps and pumps as necessary for excess or standing water, so the survey and hydraulic design—not the membrane name—decide whether pumping is needed.
Does B-S2, d0 mean a basement is fully fire compliant?
No. It is the reported reaction-to-fire classification of the membrane under EN 13501-1:2018. Linings, insulation, fixings, penetrations, compartmentation and the complete wall build-up may need separate evidence under the project’s building regulations and fire strategy.
What information should the waterproofing handover include?
Provide as-built membrane layouts, concealed-work photographs, sealed penetration details, drainage and sump locations, pump and alarm instructions, discharge routes, isolation points and a maintenance schedule. Include product identification and the certificate or data-sheet revisions used for the installation.
Is standard Delta MS 500 interchangeable with the fire-retardant version?
Do not assume so. Delta reports Class E for its standard MS 500 information and B-S2, d0 for MS 500 Fire Retardant; the products must be distinguished in schedules, delivery checks and inspection records.
