GFTK Xtreme Trass Bedding: VDW 480 Mortar


VDW 480 is a high-quality, plastic-modified jointing compound containing trass for drainable bedding mortar. The following are a few specific details about the product: 

    • Highly drainable
    • Reduces efflorescence
    • Easy to process
    • High frost and de-icing salt resistant
    • Durable against heavy-use
    • For light to medium traffic loads

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VDM 480 Mortar: What Is a Mortar Bedding System? 

The construction industry has witnessed a significant transformation over the years, and this is primarily due to the emergence of new building materials and techniques. One material that has gained popularity in recent years is Trass Bedd VDM 480 bed mortar. VDM 480 is a high-quality plastic-modified jointing compound that contains trass for drainable bedding mortar. This type of mortar is known for its superior water resistance, durability, and strength when compared to other methods. 

Trass VDM Bedding mortar is a high-quality, pre-mixed, cement-based mortar that contains volcanic ash known as “Trass.” Trass is a natural pozzolan formed by the volcanic ash of Mount Vesuvius. Trass has been used for centuries in construction due to its exceptional properties, including high water resistance and strength. 

GFTK 480 mortar bedding system

Benefits of Trass VDM 480 Mortar Bedding

Water Resistance

 Our Mortar bedding is permeable, making it ideal for use in areas exposed to extreme moisture or water, such as swimming pools, fountains, and water tanks. This type of mortar is highly durable and can withstand harsh conditions, including extreme temperatures, rain, and snow. 


Trass bed VDM 480 Mortar has excellent strength properties, making it suitable for heavy-duty applications such as driveways that bear more weight than a standard patio. Our mixture is optimized to last a long time without requiring constant maintenance. 

Advanced Adhesion 

Another benefit of our mortar bedding is its enhanced adhesion. This type of mortar has a strong bond with masonry and concrete surfaces, making it an excellent choice for building walls, foundations, and other structures. The advanced adhesion of our mortar bedding means it can be used to repair and strengthen existing patios or walls. 

Eco Friendly 

The Trass is a volcanic tuff used in the production of mortar and is a natural material that is mined from the earth. The Trass is a renewable resource that is more sustainable than many other building products that are derived from non-renewable sources. Trass VDM 480 mortar bedding is also considered a great eco-friendly material. 


Trass bedding mortar is known to be cost-effective even though it might be slightly more expensive than other types of mortar, such as traditional cement. While the initial investment might be more significant, it will pay off in the long run as our mortar bedding doesn’t require as much costly maintenance and repair. In addition, the improved workability of our mortar bedding means it can save money on labor costs because of the quick application. 

Application Guide: VDM 480 Mortar Bedding

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Surface Prep

The surface below the bedding compound must be strong enough to bear the load of the pavers as well as foot or vehicle traffic. Another essential part of building your foundation is ensuring it is water-permeable so water will not seep into the foundation and sit for long periods of time. If there are areas that are not permeable by water (such as areas with house utility connections or slab coverings), they need to have a slope of at least 1.5 – 3% so the water can run off. In case of any watertight areas where water flows and partial puddles form, it is recommended that you install a drainage mat.

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Mixing Ratio

Mix VDW 840 Trass bedding mortar in a ratio of 1:4 with a filler material such as gravel or rolled grit. Add 2.9 gallons of cool, clean water per 55 lb bag of Trass bedding mortar. Add water to the mixture until the bedding mortar is slightly shiny, and you can roll it into a firm ball. Use a gravity mixer or a pug mill mixer for the best results. The mixing can be done in a wheelbarrow or mortar tub for small amounts. After mixing, the mortar bedding is ready for immediate use. Try to use the entire contents of the bag at one time; if you are working on a minor job, you can measure out the exact amount needed and reseal the bag of bedding mortar.

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The thickness of the bedding mortar should be at least 1 ½ – 4 inches deep, depending on the load it will bear. The first step is to lay the mortar bedding loosely. Ensure that the connection elements are treated with VDW 495 – Adhesion Elutriant before they are laid in their correct positions and hammered into place. When filling the joints, a depth of 1 ¼ from the top edge of the stone is required. After you finish laying and applying, protect the surface with a sheet. After waiting 24 hours, you lightly spray the surface with water and then cover it up for 48 hours. Until the bedding mortar has reached its full strength, the surface should not be used. If it is raining, this process could take longer.

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Important Information

After 3 days, the surface can be walked on; after 10 days, it can be driven on by vehicles up to 3.5 tons. After 28 days, it is fully load-bearing, and you can enjoy your stylish new surface!

Mortar Bedding Guide

Additional information

Weight 55 lbs
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