ARDEX A 38

Mixing Ratio

By weight 1:4

• 25kg ARDEX A 38, 100kg 0-8mm sand, 6-11 liters water

By weight 1:5

• 25kg ARDEX A 38, 125kg 0-8mm sand, 6-11 liters water

By weight 1:6

• 25kg ARDEX A 38, 150kg 0-8mm sand, 6-11 liters water

The water and sand ratio may vary based on the moisture content of the sand.

Dry Powder Density

Approximately 1.0 kg/l

Fresh Mortar Density

Approximately 2.0 kg/l

Material Requirement

• For a 1:4 mix ratio: 3.7 kg powder/m²-cm
• For a 1:5 mix ratio: 3.1 kg powder/m²-cm
• For a 1:6 mix ratio: 2.6 kg powder/m²-cm

Working/Bucket Life*

Approximately 60 minutes

Open Time*

Approximately 20 minutes

Adjustment Time*

Approximately 5 – 15 minutes

Walkable*

Approximately 2 – 3 hours

Values calculated in laboratory conditions at +20°C temperature and 65% relative humidity. Environmental and weather conditions may alter these values. Higher temperatures and lower relative humidity shorten these times, while lower temperatures and higher relative humidity extend them.

Compressive Strength

For a 1:4 mix ratio, equivalent to CT-C40-F5 class:

• 25 N/mm² after 1 day
• 40 N/mm² after 7 days
• 45 N/mm² after 28 days

For a 1:5 mix ratio, equivalent to CT-C35-F5 class:

• 20 N/mm² after 1 day
• 35 N/mm² after 7 days
• 40 N/mm² after 28 days

For a 1:6 mix ratio, equivalent to CT-C30-F4 class:

• 15 N/mm² after 1 day
• 30 N/mm² after 7 days
• 35 N/mm² after 28 days

Flexural Strength

For a 1:4 mix ratio, equivalent to CT-C40-F5 class:

• 4.0 N/mm² after 1 day
• 4.5 N/mm² after 7 days
• 5.5 N/mm² after 28 days

For a 1:5 mix ratio, equivalent to CT-C35-F5 class:

• 3.5 N/mm² after 1 day
• 4.0 N/mm² after 7 days
• 4.5 N/mm² after 28 days

For a 1:6 mix ratio, equivalent to CT-C30-F4 class:

• 3.0 N/mm² after 1 day
• 3.5 N/mm² after 7 days
• 4.0 N/mm² after 28 days

Suitable for Underfloor Heating

Yes

Corrosion Behavior

Does not contain any substances that cause rust in metals.

EMICODE

EC 1 Plus – Very Low Emission

GHS/CLP Classification

GHS 05, Corrosive

Signal Word

Danger

GGVSEV/ADR Classification

None

Reaction to Fire Class

A1fl

Technical Data Sheet

Declaration of Performance

Safety Data Sheet

EMICODE Certificate

IMPORTANT NOTE

This Frequently Asked Questions (FAQ) section is prepared for general information purposes and does not constitute a definitive guide. For the most accurate and up-to-date information please refer to the product technical data sheets. For detailed information about product features, usage conditions, and application methods, we recommend consulting the ARDEX Turkey technical team. Before any application, obtaining expert advice on surface preparation and product selection will increase the success of the application.

How can I achieve a fast-setting screed for indoor and outdoor applications?

ARDEX A 38 is a rapid-setting screed cement that is walkable after 2-3 hours and ready for ceramic and natural stone tiles after 4 hours. It is suitable for both indoor and outdoor use.

What are the suitable applications for ARDEX A 38?

ARDEX A 38 can be used for tiles, ceramics, natural stone, parquet, PVC, carpet, and other elastic and textile floor coverings. It is suitable for thermal insulation boards, underfloor heating systems, and as bonded or floating screed.

How do I mix and apply ARDEX A 38 for optimal results?

Mix according to the specified ratio: 1:4, 1:5, or 1:6 with 0-8mm sand and 6-11 liters of water per 25 kg of ARDEX A 38. Apply the mixture at the same thicknesses as traditional screeds.

When can I tile or cover the screed with other materials?

You can tile with ceramics and natural stone after 4 hours and cover with parquet, PVC, carpet, and other elastic and textile-based materials after 2 days.

What is the shelf life and storage condition for ARDEX A 38?

ARDEX A 38 can be stored for approximately 12 months in its original unopened packaging, in a dry and cool environment, protected from sunlight and frost.

How can I achieve a fast-setting screed for indoor and outdoor applications?

ARDEX A 38 is a rapid-setting screed cement that is walkable after 2-3 hours and ready for ceramic and natural stone tiles after 4 hours. It is suitable for both indoor and outdoor use.

What are the suitable applications for ARDEX A 38?

ARDEX A 38 can be used for tiles, ceramics, natural stone, parquet, PVC, carpet, and other elastic and textile floor coverings. It is suitable for thermal insulation boards, underfloor heating systems, and as bonded or floating screed.

How do I mix and apply ARDEX A 38 for optimal results?

Mix according to the specified ratio: 1:4, 1:5, or 1:6 with 0-8mm sand and 6-11 liters of water per 25 kg of ARDEX A 38. Apply the mixture at the same thicknesses as traditional screeds.

When can I tile or cover the screed with other materials?

You can tile with ceramics and natural stone after 4 hours and cover with parquet, PVC, carpet, and other elastic and textile-based materials after 2 days.

What is the shelf life and storage condition for ARDEX A 38?

ARDEX A 38 can be stored for approximately 12 months in its original unopened packaging, in a dry and cool environment, protected from sunlight and frost.

How can I ensure my screed is walkable in a short time?

Using a fast-setting screed cement like ARDEX A 38 ensures the screed is walkable after just 2-3 hours, providing a quick solution for construction projects.

What is the best screed cement for underfloor heating systems?

ARDEX A 38 is suitable for underfloor heating systems, providing high compressive strength and quick setting times, making it an ideal choice for such applications.

How do I achieve a strong and durable screed for various applications?

ARDEX A 38 offers high compressive strength (up to 45 N/mm² with a 1:4 mix ratio) and is suitable for both bonded and floating screeds, ensuring a strong and durable screed for various applications.