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Installing foamed glass aggregate under a concrete slab means preparing and engineering the subgrade, completing underslab utilities, placing a separation geotextile, spreading the aggregate in controlled lifts, compacting it with the specified equipment, and then installing the required cap, vapor barrier, reinforcement, and concrete. The exact thickness, lift size, compaction ratio, and equipment come from the selected product’s current instructions and the project’s structural, geotechnical, drainage, insulation, and code requirements—not from a universal recipe.
This guide explains the sequence and the product-specific figures published by Glavel, GLAPOR, Enviro-Corp, and the Deutsches Institut für Bautechnik (DIBt). Use it to plan and check the work, but have the project engineer and the product manufacturer confirm the final assembly.
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What is foamed glass aggregate, and why is it used below a slab?
Foamed glass aggregate is a lightweight cellular material made from glass that has been processed into porous granules. In a slab assembly it can provide some combination of load-bearing fill, thermal insulation, drainage, and a pathway for soil-gas collection. The functions are product-specific: Glavel describes its material as a closed-cell aggregate and publishes an R-value of 1.7 per inch, while Enviro-Corp describes Enviro-Rock as an open foam-glass aggregate with approximately 42% void space and approximately R-2 per inch for its sub-slab application. Those figures are manufacturer claims for different products, not interchangeable design values (Glavel product information; Enviro-Rock sub-slab information).
Foamed glass is not automatically a replacement for every insulation, drainage, or radon-control layer. The selected product must have an applicable approval and structural design data for the loads and moisture conditions. For example, the DIBt assessment for identified MISAPOR cellular-glass loose-fill products says the load-bearing function is limited to predominantly static loads and conditions performance on manufacturer-compliant installation and the stated compression condition (DIBt ETA-13/0549).
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What must be decided before aggregate is delivered?
Design the complete slab assembly before ordering material. The drawings and specifications should identify the product, compacted thickness, finished elevations, structural loads, insulation target, drainage details, soil-gas or radon strategy, vapor-control layer, edge conditions, and local code requirements. Ask the engineer to state whether dimensions refer to loose fill, pre-compacted fill, or final compacted thickness.
- Product and approval: Confirm the exact manufacturer, product grade, regional approval, and intended use. Do not substitute an open-structure drainage product for a closed-cell insulation product without design approval.
- Subgrade and water: Establish the required formation level, drainage outlet, and measures for groundwater or surface water. The work area must be free of standing water, ice, and soft or unstable material before placement.
- Utilities: Show every pipe, conduit, drain, sleeve, cleanout, and penetration on the utility plan. Install and inspect them before aggregate placement.
- Interfaces: Detail the perimeter, footings, columns, thickened slab edges, vertical upturns, cap, vapor barrier, reinforcement, and any under-slab heating or plumbing protection.
- Construction access: Decide how aggregate will be delivered and spread without driving on uncovered or uncapped material. Product specifications may prohibit vehicle traffic after compaction.
How do you prepare the subgrade and utilities?
- Set grades and remove unsuitable material. Excavate or fill to the designed formation level. Remove mud, organic soil, frozen soil, debris, and any yielding zones; replace and compact them with the material and method specified by the engineer.
- Compact the formation. Compact the soil subgrade to the project’s specified density and verify elevations. A generic density target cannot be inferred from the aggregate manufacturer’s compaction percentage.
- Install underslab services. Complete drains, sleeves, plumbing, electrical conduit, and cleanouts. Pressure-test or inspect services as required before they are covered.
- Protect services. Mark pipe routes and maintain the clearance required by the applicable specification. Glavel’s specification, for example, requires compaction equipment to remain at least 6 vertical inches from adjacent or crossing plumbing and conduit and requires pipes to be protected during compaction (Glavel three-part specification). That is a Glavel requirement, not a universal clearance for every product.
How do you install the bottom separation geotextile?
Place the specified separation geotextile directly over the prepared subgrade before spreading aggregate. Keep it flat, without folds that could create voids, and repair tears before covering it. Overlap adjoining panels or sew them as the manufacturer and project specification require; turn the fabric up at vertical faces where shown on the drawings.
Glavel’s specification gives an example minimum of 6 ounces per square yard, or AASHTO M 288 Class 2, with a 120-pound minimum grab tensile strength. It also calls for adjoining panels to overlap at least 12 inches or to be sewn per the manufacturer’s recommendation (Glavel specification). These criteria must not replace a project geotechnical specification if the engineer calls for a different class or strength.
How should the foamed glass aggregate be placed and leveled?
Deliver the material to the designated area, spread it without contaminating the geotextile, and level each lift before compaction. Raking by hand or using small equipment is described in Glavel’s residential guide. Keep the bucket, blade, tires, or tracks from gouging the separation layer or striking utilities.
Measure the lift using the terminology in the applicable guide. Glavel’s residential guide describes 15-inch pre-compacted lifts and says installations deeper than 12 inches compacted should be split into lifts. Its commercial specification uses 15-inch uncompacted lifts for one tracked-equipment method and a maximum 12-inch uncompacted lift where a plate compactor is used. Because “pre-compacted,” “uncompacted,” and “compacted” dimensions are not equivalent, write the required measurement on the site plan and confirm it with the manufacturer (Glavel residential guide; Glavel commercial guide).
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What compactor and pass count should you use?
Use only the compactor, lift thickness, pressure, and pass count approved for the chosen product and installation method. The documents show why one recipe cannot be transferred between products or projects.
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| Published method | Lift or equipment detail | Compaction instruction | Important limitation |
|---|---|---|---|
| Glavel residential guide | Lightweight vibratory plate under 200 lb | Four to five full passes are stated to achieve 25% compaction for that method | Extra passes increase material use without improving the material properties, according to the guide |
| Glavel commercial specification, tracked method | 15-inch uncompacted lifts; tracked equipment at 4–7 psi | Use the method and pass pattern specified for the project | Do not use this pressure or lift as a general rule for another product |
| Glavel commercial specification, restricted-access method | Maximum 12-inch uncompacted lifts; 110–220 lb plate compactor | At least four full passes | Alternate methods require written engineer approval and supporting data |
The residential 25% figure and the commercial equipment ranges are tied to Glavel’s documents and stated methods (residential technical guide; commercial technical guide). A different manufacturer may define its compression differently. The DIBt assessment for the identified MISAPOR products conditions performance on manufacturer-compliant installation at a 1.3:1 compression condition (DIBt assessment), and GLAPOR publishes a 1.3:1 compaction ratio for its ballast (GLAPOR product guidance). Confirm how the selected supplier defines and records that ratio.
Keep a placement log showing the product lot, area, lift description, loose and final elevations, equipment, passes, weather, and any repairs. If the engineer requires verification, use the test or observation method named in the project documents. GLAPOR cautions that load-plate compression tests cannot be reliably conducted on its cellular-glass ballast, so do not order an unsuitable test simply because it is common for soil or crushed stone.
How thick should foamed glass aggregate be under a slab?
There is no source-supported universal thickness. Thickness is calculated from structural loads, required insulation, frost and ground conditions, drainage or soil-gas objectives, elevations, and the rest of the slab assembly. The responsible structural engineer or building physicist should dimension it.
GLAPOR guidance gives a product-specific range of 15–90 cm of compacted ballast and a maximum 39 cm of loose fill in one operation (about 30 cm compacted); higher fills require multiple layers (GLAPOR guidance). Glavel’s residential instructions describe 15-inch pre-compacted lifts and splitting deeper installations into multiple lifts. Neither set of figures establishes a minimum or maximum for another product.
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When ordering, calculate the compacted plan volume as length × width × designed compacted depth. Convert that volume to the supplier’s loose or delivered volume only with the supplier’s stated compression relationship, and ask how the quotation accounts for lift measurement. Do not add an invented waste percentage or substitute a soil bulking factor for the manufacturer’s conversion.
What cap and vapor barrier go above the compacted aggregate?
Cap the finished aggregate immediately after final compaction if the product specification requires it. Glavel’s commercial guide lists at least 2 inches of sand, stone dust, or fine gravel, or a qualifying woven or nonwoven geotextile, as capping options. It also states that vehicles may not travel on uncapped aggregate (Glavel commercial guide).
Where the design calls for a vapor barrier, install it over the specified cap or geotextile. Use the membrane type, thickness, seam tape, perimeter seal, and penetration details shown in the drawings. Glavel’s specification gives a 15-mil barrier as an example; that example is not a universal thickness (Glavel specification).
Lay the barrier without sharp folds, seal laps and penetrations, and provide temporary protection where reinforcing steel, chairs, wheelbarrows, or pump hoses could puncture it. Repair damage with compatible material before concrete placement. Keep the cap and membrane clean so debris does not create voids or compromise seams.
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It can be one component of a designed soil-gas system, but aggregate alone is not a complete radon mitigation system. The design may require a continuous permeable layer, collection points, sealed penetrations, a vent pipe, and an exhaust location or fan selected for the building and local code. Enviro-Rock’s open structure is described as a drainage and soil-gas pathway, while Glavel’s product information describes its own closed-cell material; those characteristics lead to different design assumptions (Enviro-Corp application page; Glavel product page). Have the radon professional or engineer specify the complete system.
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How do you inspect the layer before concrete placement?
Complete a pre-pour inspection after the final lift is compacted, capped, and protected. The design team should confirm elevations and the condition of every interface before reinforcement and concrete arrive.
- Verify the aggregate product, lot, lift records, finished elevations, and approved compaction method.
- Check that no soft spots, ruts, displaced geotextile, exposed utilities, or unfilled excavations remain.
- Confirm that pipes, conduits, drains, cleanouts, and sleeves are at the designed locations and were not damaged.
- Confirm the cap is continuous and that prohibited traffic has not crossed uncapped material.
- Inspect the vapor barrier for punctures, open seams, unsealed penetrations, and missing perimeter seals.
- Repair disturbed areas using the specified lift and compaction procedure; do not simply rake loose material into a depression.
- Protect the completed assembly from weather and construction traffic until reinforcement and concrete placement.
What are the most common installation mistakes?
- Choosing thickness by rule of thumb: A depth that works on one project may miss insulation, elevation, or structural requirements on another. Obtain a project-specific design.
- Mixing product instructions: A 25% compaction target, 1.3:1 ratio, plate weight, or lift thickness belongs to the product and method that published it.
- Covering utilities before inspection: Leaks and incorrect elevations become expensive to correct after aggregate and concrete are installed.
- Using heavy equipment too close to pipes: Maintain the clearance and protection stated in the applicable specification.
- Leaving aggregate uncapped: Foot and vehicle traffic can disturb the surface and create later settlement or membrane damage.
- Testing with the wrong method: Some cellular-glass products do not give reliable results with load-plate tests developed for other fills; follow the engineer’s approved verification method.
- Treating insulation and drainage claims as universal: Closed-cell and open-structure products can serve different functions. Compare the approved design properties, not just the material name.
- Assuming a case study is a guarantee: Glavel reports that 85 cubic yards were used at Bishop Passive House and reports an 85% energy-use reduction for that project; those are manufacturer case-study statements, not expected results for every slab (Glavel product page).
What should be in the installer’s sub-slab checklist?
Before mobilization, have the latest product guide, specification, approved drawings, utility plan, geotextile and vapor-barrier data, delivery plan, compactor information, and inspection forms on site. During work, record each lift and keep the working area dry and protected. Before the pour, obtain the required engineer or building-official release.
The cited documents come from different manufacturers, regions, products, and installation systems. Confirm current revisions, local requirements, structural design, utility protection, radon strategy, moisture control, and weather limitations with the project professionals. The sources do not establish a neutral head-to-head product ranking or a single compaction recipe for every foamed glass aggregate.
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Frequently asked questions
Can foamed glass aggregate replace rigid board insulation?
Sometimes a design may use aggregate as the insulation layer, but equivalence depends on the product’s tested thermal value, compacted thickness, moisture condition, edge detailing, and structural role. Compare the complete assembly’s required R-value and thermal-bridge details with the engineer rather than substituting by thickness alone.
Does foamed glass aggregate absorb water?
Water behavior depends on the product’s cellular structure and the surrounding assembly. The installation still needs a stable, drained subgrade and the weather and storage protection required by the product documents; do not assume that a lightweight fill eliminates groundwater or surface-water control.
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Can a normal soil-density test verify cellular-glass compaction?
Not necessarily. GLAPOR specifically cautions that load-plate compression tests cannot be reliably conducted on its cellular-glass ballast, so the engineer should identify an appropriate observation, dimensional, or product-specific verification method before installation.
How should the aggregate be stored before placement?
Keep deliveries protected from weather, contamination, and damage in accordance with the selected manufacturer’s instructions. The DIBt assessment requires protection from weather during transport, storage, and installation for the identified MISAPOR products; other products may state different limits.
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Most installations also require grading or raking tools, measuring and level equipment, geotextile knives or sewing supplies, membrane seam materials, and protection boards or walkways for the finished barrier. Select each item from the approved drawings and product specification, especially where equipment could puncture the vapor barrier or overload a utility.
Frequently Asked Questions
Can foamed glass aggregate replace rigid board insulation?
Sometimes a design may use aggregate as the insulation layer, but equivalence depends on the product’s tested thermal value, compacted thickness, moisture condition, edge detailing, and structural role. Compare the complete assembly’s required R-value and thermal-bridge details with the engineer rather than substituting by thickness alone.
Does foamed glass aggregate absorb water?
Water behavior depends on the product’s cellular structure and the surrounding assembly. The installation still needs a stable, drained subgrade and the weather and storage protection required by the product documents; do not assume that a lightweight fill eliminates groundwater or surface-water control.
Can a normal soil-density test verify cellular-glass compaction?
Not necessarily. GLAPOR specifically cautions that load-plate compression tests cannot be reliably conducted on its cellular-glass ballast, so the engineer should identify an appropriate observation, dimensional, or product-specific verification method before installation.
How should the aggregate be stored before placement?
Keep deliveries protected from weather, contamination, and damage in accordance with the selected manufacturer’s instructions. The DIBt assessment requires protection from weather during transport, storage, and installation for the identified MISAPOR products; other products may state different limits.
What equipment is needed besides a compactor?
Most installations also require grading or raking tools, measuring and level equipment, geotextile knives or sewing supplies, membrane seam materials, and protection boards or walkways for the finished barrier. Select each item from the approved drawings and product specification, especially where equipment could puncture the vapor barrier or overload a utility.
