Xtreme Bedding Compound VDW 480 Mortar Bed 55 lbs
$74.09
The PHNA Xtreme Bedding Compound is a high-strength, highly plastic-modified, frost-resistant drainage mortar bedding for the laying of natural stone, slabs, tile, and concrete pavers.
- Water‑permeable: Drains fast to keep stones dry
- Frost/salt resistant: Withstands freeze–thaw and de‑icing salts
- No efflorescence: Rapid hardening without salt deposits
- Plastic coating: Resists capillary water rise
- Traffic‑ready: Suitable for light to heavy loads
- High strength: Up to 5500 psi compressive strength
- No sub‑slab needed: Eliminates concrete base
- Fast workflow: Grout after 24 hours
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| Use Cases | Laying natural stone, slabs, tile, and concrete pavers |
| Application Time | Approx. 1 hour at 20°C / 68°F; faster at higher temps, slower at lower |
| Temperature Range | 5–25°C / 41–77°F; do not lay on frozen ground |
| Material Requirement | 1/8”–3/8” clean crushed aggregate |
| Aggregate per Bag | Approx. 220 lbs aggregate per 55 lb bag of bedding compound |
| Water Addition | Approx. 11 L / 2.9 gal per 25 kg / 55 lb bag; reduce for wet aggregate |
| Compressive Strength | 2900–5500 psi at 3 and 28 days (depends on filler and ratio) |
| Flexural Strength | Approx. 1015 psi |
| Ingredients | Cement per EN 197; Trass per DIN 51043; special additives |
| Storage Life | 1 year unopened in sealed, undamaged packaging; keep dry and frost‑free |
| Mixing & Coverage Method | Add aggregate + ~75% water, then Trass, then remaining water; mix 4–5 minutes to earth‑moist, slightly shiny; forms a loose ball |
| Equipment | Compulsory or gravity mixer; small batches in wheelbarrow/mortar tub possible (longer mix time) |
| Coverage | Approx. 2.5–2.7 ft³ per unit at 1:4 ratio |
| Application layer thickness | Minimum 1.5” / Maximum 4” |
VDM 480 Mortar: What Is a Mortar Bedding System?
Trass Bedding Mortar VDW 480 is a pre‑mixed, cement‑based, plastic‑modified mortar engineered for drainable bedding. It’s enhanced with natural “trass,” a volcanic pozzolan from Mount Vesuvius, long valued for improving water resistance and strength. The result is a durable, high‑performance bedding mortar that resists moisture, supports heavy use, and outperforms conventional mixes in longevity and stability across modern hardscape applications.
Benefits of Trass VDM 480 Mortar Bedding
Highly water-permeable
Water flows through the bedding, keeping stones dry, reducing runoff, and recharging groundwater—especially valuable in freeze–thaw climates to minimize erosion.
Frost and de-icing salt resistant
Frost- and de-icing salt resistant, this permeable bedding lets water pass, keeping surfaces cleaner and stones dry.
Groutable after 24 Hours
It dries fast, so you can grout in 24 hours—speeding up schedules, wrapping jobs sooner, and keeping quality high.
Compatible with radiant heating/snowmelt systems
This Bedding System is suitable for use with under-surface heating. It is also permeable, allowing surfaces to dry and be warm without shifting or cracking.
Installation Instructions
1. Construction Site Requirements
- The subsurface must be made load-bearing, firm, and water-permeable.
- Ensure drainage through permeable subsoil or a sufficient drainage gradient.
- Water-impermeable load distribution layers, such as areas with house utility connections or any slab coverings laid, must have a slope of at least 1.5–3.0%.
- A suitable capillary-breaking drainage mat should be installed in watertight outdoor areas and levels where water flows or partial puddles form.
- Ambient and substrate temperature should be 41-77°F, and the process should be carried out in dry weather.
2. Preparation
RECOMMENDED MIXING RATIO
- 1 volume part Xtreme Bedding Compound
- 4 volume parts suitable aggregate (i.e. 1/8″ – 3/8″ clean crushed or rolled grit/gravel)
- 11 liters | 2.9 gal cool, clean water per 25 kg | 55 lb. bedding compound – Make a note of wet/damp aggregate and reduce water consumption accordingly.
- Using a compulsory mixer or gravity mixer, mix the Xtreme Bedding Compound in a ratio of 1:4 with suitable aggregate and water. Mix so that it becomes earth-moist; the total mixing time 4–5 minutes.
- First add the aggregate and approx. 75% of the water to the mixer, followed by the Xtreme Bedding Compound.
- Little by little, continue to add the remaining water to the mixture until the mortar is slightly shiny and can be formed into a loose ball.
- Mixing can be completed in a wheelbarrow or mortar tub for smaller batches.
- These methods may require a longer mixing time to achieve a homogeneous mortar.
- After mixing, the mortar is ready for immediate use. When possible, it is recommended to use the entire bag of bedding compound, but precise quantities should be weighed out for smaller batches.
- Expect approx. 2.5 – 2.7 ft3 of coverage per unit mixed at a 1:4 ratio.
3. Application
- Apply the mixed bedding mortar manually in layers of a minimum of 1.5″ and a maximum of 4″ thickness.
- In the case of pavers or stones that are uniform in thickness, the bedding mortar can be leveled to the required layer thickness using screed bars.
- The underside of paving units must be pre-treated with our Xtreme Adhesion Elutriant (vdw 495) and set at the correct height before hammering into place with a rubber mallet or dead-blow hammer.
- The joint area must be water-permeable and free of Xtreme Adhesion Elutriant universal bonding bridge.
- Post-treatment:
- The bedding mortar must be protected from drying out too quickly, avoiding excessive heat.
- After installation, the bedding mortar must be protected against drying out for at least 24 hours.
- Covering with a tarp may be necessary for this time.
- The surface should also be covered in adverse weather, such as sustained rainfall.
Important Information
- The surface can be walked on after 24 hours or after the mortar has hardened. Grouting can also be carried out at this time.
- Full resilience will be reached after 7 days, but vehicular areas should not be trafficked until the grout is sufficiently cured.
- Please refer to the datasheet of the grout used for this information.
| Weight | 55 lbs |
|---|---|
| Dimensions | 21 × 11 × 4 in |
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