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“Concrete cushions” refers to a Building Design + Construction product brief about Blue Platon, a dimpled membrane installed between a concrete slab and a finished floor—not cushions made from concrete. The membrane is intended to separate flooring from cold, damp concrete by creating a vapour-resistant layer and a small drainage/ventilation air gap. Current Platon Underlayment information from Armtec describes the same basic approach: the dimples face the slab, seams are overlapped and sealed, and a load-spreading sheet such as OSB is installed above where the assembly requires it. The 2010 brief also attributed shock-cushioning and sound-deadening benefits to the dimple pattern, but the sources available here do not provide independent comparative testing of those claims.
What are “concrete cushions”?
In this context, “concrete cushions” is shorthand for a 2010 Building Design + Construction product item titled Concrete cushions. The item described Blue Platon, a subfloor membrane for flooring installed over concrete. It was not a furniture product, a structural concrete pad, or a recipe for casting soft concrete.
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Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →The historical brief said the membrane’s concentric dimples create an air space between the slab and the flooring assembly. That space, together with the membrane itself, was presented as a way to protect floor coverings from moisture in concrete while allowing the slab to breathe. You can read the original description in Building Design + Construction’s 2010 brief.
Current Armtec Platon Underlayment information describes the product as a flooring protector that isolates finished flooring from cold, damp concrete. Armtec says it forms a subfloor vapour barrier and air gap while allowing concrete to breathe. Because the brief is from August 11, 2010 and the current product information is from a later manufacturer source, do not assume that ownership, formulation, dimensions, or installation details are unchanged without checking the current documents for your market.
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How does a dimpled membrane protect flooring over concrete?
The direct mechanism is separation. A continuous plastic membrane lies on the slab, while its raised dimples hold the next layer slightly above the concrete. This arrangement limits direct contact between damp concrete and the flooring assembly and provides a defined space beneath the load-spreading layer.
Armtec’s product description uses the terms “impermeable subfloor vapour barrier” and “air gap.” In practical terms, that means the underlayment is intended to manage vapour moving from the slab toward the floor covering; it is not a substitute for repairing a plumbing leak, groundwater entry, hydrostatic pressure, or a slab with active liquid water. The source material does not establish suitability for every basement, every slab, or every flooring system.
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Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →The air gap is also why installation orientation matters. The specification describes laying strips with the dimples down, toward the concrete. Reversing the membrane can change how the assembly bears loads and how the intended gap functions. Follow the current installation guide rather than relying on a remembered detail from an older brief.
What comfort benefits were claimed?
The 2010 Building Design + Construction item stated that the concentric dimple design “also provides shock cushioning and sound-deadening for hard-surface floors.” That wording is a claim made in the historical product brief, not an independently verified test result in the supplied sources.
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A resilient membrane and air space can be part of a floor assembly that feels less harsh than flooring placed directly on a slab, but the final result depends on the finished floor, underlayment layers, subfloor stiffness, room geometry, and installation quality. Do not promise a particular impact-noise reduction, footfall rating, or comfort level unless the complete assembly has documentation for that performance.
What are the published Platon specifications?
Armtec’s flooring specification sheet lists the following dimensions for the version documented there. These are manufacturer specifications, not measurements from an independent laboratory, and product details can vary by market or later revision.
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| Specification | Published value | What it means for a project |
|---|---|---|
| Flat-section thickness | 24 mil | Nominal membrane thickness between the raised features. |
| Thickness in dimples | 21 mil | Manufacturer-listed thickness at the formed areas. |
| Dimple height | 1/4 inch (6.0 mm) | The approximate air-gap depth created above the slab when installed as specified. |
| Membrane length | 65 feet, 6 inches (20 m) | One listed roll length; confirm the roll supplied in your region. |
| Widths | Multiple widths available | Select a width that suits the room layout and seam plan. |
The complete Platon Flooring Specification sheet should control purchasing and design decisions. Confirm the document revision, local availability, roll dimensions, compatible flooring types, and required accessories before ordering.
Which flooring can go over the membrane?
The specification describes assemblies using carpet, laminate, hardwood, or vinyl floor coverings, with an OSB load-spreading sheet above the membrane. That list is not blanket approval for every product in those categories. Each flooring manufacturer can impose requirements for subfloor flatness, deflection, moisture readings, expansion gaps, fastening, and adhesive compatibility.
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Think of Platon as one layer in a system:
- Concrete slab: must be sound, reasonably clean, and evaluated for moisture and levelness.
- Dimpled membrane: installed in the specified direction and layout.
- Seams: overlapped and sealed as required by the current instructions.
- Load-spreading layer: OSB or another specified sheet where the assembly calls for it.
- Finish flooring: installed to its own manufacturer’s requirements.
Some floor coverings require a rigid, mechanically fixed subfloor; others require a particular adhesive or moisture limit. Never omit the load-spreading layer simply because the membrane appears stiff enough to walk on. Point loads, furniture legs, rolling loads, and concentrated impacts can behave very differently from a person walking across an uncovered strip.
How is Platon underlayment installed over a concrete slab?
Installation requires the current Armtec instructions, the flooring manufacturer’s requirements, and a project-specific moisture assessment. The following sequence reflects the specification’s described assembly, but it is not a substitute for those documents.
- Confirm the assembly before buying materials. Identify the finished flooring, the required subfloor or underlayment, seam-sealing products, perimeter details, and any adhesive or fastening restrictions. Resolve conflicts between the membrane instructions and the flooring warranty before work begins.
- Inspect and prepare the slab. Remove dust, debris, sharp projections, and contaminants that could puncture the membrane or prevent it from lying flat. Check levelness and repair defects using products compatible with the intended assembly. Investigate any visible water, efflorescence, leaks, or cracks that may be carrying moisture.
- Plan strip direction and seams. Lay out the room so strips fit with as few joints as practical and so seams do not create a high spot under a critical flooring joint. Account for walls, doorways, columns, steps, and transitions.
- Place the membrane with dimples down. Roll out the material over the slab as directed, keeping it from folding or bridging voids. Avoid dragging tools or materials across it and protect it from punctures during the rest of the work.
- Overlap and seal adjacent strips. The specification calls for overlapping and sealing neighboring strips. Use the current approved tape or sealing method and follow its temperature, cleanliness, and pressure requirements. A visually closed joint is not automatically a vapour-tight or manufacturer-approved joint.
- Install the load-spreading sheet. Place the specified OSB layer above the membrane, with joints and edge clearances arranged according to the current guide. The sheet distributes loads so the finished floor does not bear on isolated dimple points.
- Install the finish floor. Maintain the flooring manufacturer’s expansion gaps, acclimation rules, fastening pattern, adhesive limits, and moisture criteria. Keep the membrane and OSB assembly dry and clean until the finish floor is installed.
- Document the completed assembly. Record product identification, installation-guide revision, seam materials, slab moisture readings, and any deviations. This information helps diagnose movement or moisture complaints later and supports warranty discussions.
Does this underlayment solve basement moisture problems?
No. It is a flooring-protection layer, not a complete basement waterproofing system. It may help isolate a finished floor from vapour associated with a damp slab, but it cannot stop water entering through a wall, footing, joint, drain backup, plumbing failure, or hydrostatic pressure.
Before covering a basement slab, determine whether moisture is vapour, intermittent liquid water, or a continuing drainage problem. Correct exterior drainage, plumbing leaks, cracks, or groundwater pathways first. If the slab is actively wet, obtain advice from a qualified waterproofing or building professional and follow the flooring manufacturer’s moisture-testing method. Installing a membrane over an unresolved water source can conceal damage and make remediation more difficult.
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What are the main limitations and failure modes?
Most problems come from treating a component as if it were the entire floor system. Watch for these conditions:
- Unsealed or poorly bonded seams: Dust, cold temperatures, inadequate overlap, or incompatible tape can compromise the intended vapour-control layer. Re-clean and reseal only as the current instructions permit.
- Punctures: Fasteners, sharp aggregate, tools, and later trades can damage the membrane. Replace or repair damaged sections using an approved method before covering them.
- No load-spreading sheet: Directly placing a finish floor over dimples can create uneven support, movement, or damage. Confirm the required OSB or other sheet layer.
- Wrong orientation: Dimples-up installation may not match the documented assembly. Stop and verify rather than improvising.
- Trapped liquid water: A membrane does not make a wet slab dry. Find and fix the source, then reassess the slab and flooring requirements.
- Incompatible floor covering: A product category such as “vinyl” or “hardwood” includes assemblies with different adhesive, fastening, and moisture rules. Obtain written compatibility information where the warranty matters.
- Outdated dimensions: Roll lengths, widths, thicknesses, and accessories can change. Use the latest local specification instead of assuming the 24-mil, 6.0-mm, 20-m values apply to every package.
How should a contractor decide whether to specify it?
Start with the moisture condition and the flooring manufacturer’s requirements, not with the membrane’s marketing name. A sensible decision sequence is:
- Classify the slab location and moisture risk.
- Determine whether the project needs vapour control, a thermal break, a raised subfloor, or actual waterproofing; these are related but different functions.
- Check the proposed flooring warranty and required subfloor construction.
- Compare the current Platon assembly details—dimple height, seam treatment, load-spreading layer, perimeter treatment, and allowable floor coverings—with the project drawings.
- Confirm supply, roll dimensions, accessories, and installation conditions locally.
- Specify inspections before the assembly is concealed.
If the project needs a different performance—such as a tested acoustic rating, insulation value, or structural subfloor capacity—request documentation for the complete assembly. The supplied sources do not establish that Platon outperforms unnamed alternatives, so avoid selecting it on an unsupported comparison.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What changed between the 2010 brief and current product information?
The 2010 brief is useful for identifying why the phrase “concrete cushions” appears: it introduced Blue Platon as a membrane with an air gap and claimed cushioning and sound-deadening benefits. Current Armtec materials focus more directly on Platon Underlayment as a flooring protector, vapour barrier, and breathing air gap over damp concrete.
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The sources do not document the corporate relationship between Big ‘O’ Inc., which the historical brief listed as its reader-service contact, and current Platon materials published by Armtec. They also do not prove that the product formulation or specifications stayed identical. Treat the historical wording as historical context and the current manufacturer documents as the starting point for a present-day installation.
What should be verified before the floor is covered?
Use a closeout checklist:
- Current product name, revision, and local specification are recorded.
- Slab moisture and liquid-water conditions meet the flooring and membrane requirements.
- Surface is clean, sound, and free of puncturing projections.
- Dimples face the slab throughout the installation.
- Strips have the specified overlap and approved seam seal.
- Penetrations, edges, doorways, and transitions follow the current guide.
- OSB or another required load-spreading layer is installed before the finish floor.
- Finish flooring is approved for the complete assembly, including adhesive or fastener method.
- Photographs and installation records are saved before concealment.
Frequently Asked Questions
Can I install Platon underlayment directly under laminate flooring?
The published specification describes a load-spreading OSB layer above the membrane before flooring such as laminate is installed. Confirm the exact laminate manufacturer’s subfloor and moisture requirements; do not assume a direct-to-membrane installation is approved.
Should the dimples face up or down?
The specification describes installing the strips with the dimples down, toward the concrete slab. Verify the orientation in the current regional installation guide before beginning, especially if you are using a different product revision.
Is a dimpled membrane the same as basement waterproofing?
No. It is intended to separate flooring from damp concrete and manage vapour in the floor assembly. It does not repair leaks, stop groundwater pressure, or replace exterior drainage and foundation waterproofing.
Can this system reduce impact noise?
The 2010 Building Design + Construction brief claimed shock cushioning and sound-deadening for hard-surface floors. That statement is historical product-brief language, not independent comparative test evidence supplied here, so request assembly-specific acoustic data when noise performance is a design requirement.
How do I know which roll size to order?
Armtec’s specification lists a 65-foot, 6-inch (20 m) length and multiple widths for one documented version, but dimensions can vary by market or revision. Measure the project with seam overlaps and waste included, then confirm the available roll sizes in the current local documentation.
