ARDEX A38 MIX Pre-Blended Ultra Rapid Drying Cement for Internal and External Screeds Grey 25kg
£39.71 inc. VAT
£33.09 ex. VAT
- Product ID: 24160
- Suitable For: creating bonded, unbonded, and floating screeds
- Area of use: INT & EXT
- Application Method: trowel
- Volume: 25KG
- Container Type: bag
- Type: mortar
- Colour: grey
- Brand: Ardex
- Manufactuer: Ardex
- Box Size: 1
ARDEX A 38 MIX is suitable for creating bonded, unbonded, and floating screeds in both internal and external locations, including wet areas like swimming pools. It is also effective for large repairs to existing cement/sand screeds, making it ideal for projects that require rapid hardening and early foot traffic.
Substrate Preparation for Screeding
Bonded Screed: To create a bonded screed with ARDEX A 38 MIX, first apply a grouting slurry made by diluting ARDEX P 51 Primer & Bonding Agent with an equal volume of water, then mix in ARDEX A 38 MIX until achieving a creamy consistency. For external locations or wet areas, ARDEX A 18 may be used. The concrete surface must be properly prepared with mechanized equipment to expose coarse aggregates and should be at least 6 weeks old before applying the screed while the slurry is still wet.
Unbonded Screed: Ensure the concrete slab is reasonably flat before applying a damp proof/slip membrane. For any uneven areas needing leveling, refer to the ARDEX A 46 datasheet for localized repairs or the ARDITEX NA datasheet for larger areas.
Floating Screed: For floating screeds, place a suitable separating or damp proof membrane over the insulation before applying the screed mortar. ARDEX A 38 MIX can be directly applied to concrete bases that are inadequately dry (above 75% RH), directly to ground, or areas subject to rising damp. However, it is recommended to use a damp proof membrane for projects with resilient floor finishes to protect against moisture from the substrate. For unbonded and floating screeds, install a damp proof/slip membrane as per BS 8204-1+A1 and BS 5385-3 before laying the screed. For bonded screeds, apply ARDEX DPM 1 C or ARDEX DPM 1 C R after 3 hours. If the concrete base has residual moisture below 95% RH, substitute with ARDEX MVS 95 after 4 hours.
Substrate Preparation for Screed Repairs
Repairs should be cut back to sound material, with cut edges treated using a bonding coat of ARDEX A 38 MIX mixed with ARDEX P 51 for dry, internal areas or ARDEX A 18 for external or wet areas. Compact ARDEX A 38 MIX into the bonding coat while it’s still wet.
Water Content
Add enough water to achieve a workable mix, up to a maximum of 1.75 liters per 25 kg bag. Do not exceed this amount to ensure rapid drying and strength development. The mix should have a normal screed consistency, retaining shape without crumbling when squeezed. Mixing should be done using forced action mixers, as free-fall mixers are not suitable.
Application
The working time of the mixed mortar is approximately 1 hour at 20°C, so mixing, placing, and finishing must be completed promptly. For new bays against hardened screeds, day work joints should be vertical and treated with the grouting slurry. Apply ARDEX A 38 MIX at temperatures above 5°C. For installations over underfloor heating systems, allow 3 days before heating the water to 25°C, maintaining this temperature for another 3 days, then increasing it for an additional 4 days while avoiding draughts.
Drying Time
ARDEX A 38 MIX can be walked on 3 hours after application, with ceramic and natural stone tiles able to be installed after 4 hours, regardless of thickness. Resilient floor coverings like carpet, vinyl, rubber, and wood can be installed after 2 days, and the screed will be fully dry after 48 hours.
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| Elementlength | |||||||
| up to 1,5 m |
up to 2,5 m |
up to 3,5 m |
up to 4,5 m |
up to 2,5 m |
up to 3,5 m |
up to 4,5 m |
|
| Type of window frame material |
Minimum witdth of joints for a butled mounting b in mm |
Minimum witdth of joints for a inner mounting b in mm |
|||||
| Hard PVC (white) | 10 | 15 | 20 | 25 | 10 | 10 | 15 |
| Hard PVC and PMMA (dark) (colour extruded) |
15 | 20 | 25 | 30 | 10 | 15 | 20 |
| Hard PUR integral foam | 10 | 10 | 15 | 20 | 10 | 10 | 15 |
| Wood-aluminium-window | 10 | 10 | 15 | 20 | 10 | 10 | 15 |
| Aluminium-plastic sandwich frame (bright) |
10 | 10 | 15 | 20 | 10 | 10 | 15 |
| Aluminium-plastic sandwich frame (dark) |
10 | 15 | 20 | 25 | 10 | 10 | 15 |
| Wooden window frame | 10 | 10 | 10 | 10 | 10 | 10 | 10 |
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