“Rexpandit” is a joint element that foams up in the event of a fire and is used to seal structural joints in walls or ceilings for fire protection purposes.
“Rexpandit 10 / 30” consists of a compressible foam strip covered on the right and left with a layer of the building material “Flaton-flex EN” which foams up in case of fire.
“Rexpandit 20 / 40” also consists of a compressible foam strip, but with a double layer of “Flaton-flex EN” on the right and left.
“Rexpandit” is elastic and compressible. The element is clamped into the joint during installation. The joint is immediately smoke-tight and sound-insulated.
In case of fire, the outer layers of “Flaton-flex EN” expand. The joints are filled by the material that forms. The foam strip is replaced by the intumescenting material. This creates an effective barrier that prevents the passage of fire, heat and smoke for at least 90 minutes.
- “Rexpandit” is classified in building material class C-s1, dO according to DIN EN 13501-1:2019-05.
- “Rexpandit” is sound-insulating. The tested joint sound insulation value is: Rs,w = 45.9 dB at 10 mm joint with “Rexpandit 10/30” Rs,w = 37.2 dB at 20 mm joint with “Rexpandit 20/40”.
- The intumescent “Flaton-flex EN” is free of halogen, antimony, silicone and solvents. The foam is open-cell and has high sound absorption.
- The foam has good thermal insulation properties.
- There is no embrittlement at low temperatures.
- The foam is produced without the use of halogenated hydrocarbons. The product is not hazardous to water.
- On delivery, the “Rexpandit” is free of propellants and does not require labelling according to the Ordinance on Hazardous Substances.
| Name | Length x width x filling depth | Article number |
| Rexpandit 10/30 | 1250 x 32 x 60 mm | 126323 |
| Rexpandit 20/40 | 1250 x 48 x 60 mm | 125463 |
Classified fire resistance: EI 90
Wall joints with lateral expansion movement of 20 mm:
| Cross laminated wood to cross laminated wood | Cross laminated wood on solid construction element | |||
| Rexpandit 10/30 | Expansion joints from 10 to 30 mm joint width | Rexpandit 10/30 | Expansion joints from 10 to 30 mm joint width | |
| Rexpandit 20/40 | Expansion from 20 to 40 mm Joint width | Rexpandit 20/40 | Expansion from 20 to 40 mm Joint width | |
Joints in ceilings and horizontal joints between ceilings and rising wall with lateral expansion of 20 mm and, if necessary, additional shear movement of 25 mm:
| Cross laminated wood to cross laminated wood | Cross laminated wood on solid construction element | |||
| Rexpandit 10/30 | Expansion joints from 10 to 30 mm Joint width + shear 25 mm | Rexpandit 10/30 | Expansion joints from 10 to 30 mm Joint width + shear 25 mm |
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| Rexpandit 20/40 | Expansion from 20 to 40 mm Joint width + shear 25 mm | Rexpandit 20/40 | Expansion from 20 to 40 mm Joint width + shear 25 mm |
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Solid component
Structural elements made of aerated concrete with an apparent density of 650 kg/m³ ± 200 kg/m³ or higher apparent densities in the case of normal concrete, hollow blocks and masonry.
Cross laminated wood
Solid timber component type “KLH®-CLT” according to ETA-06/0138 with a gross density of 402.5 kg/m³ or greater and 120 mm component thickness or thicker in wall components. For ceiling components, the gross density is 446.4 kg/m³ or greater and at least 160 mm component thickness.
Before installing “Rexpandit”, the inner flanks of the joint must be cleaned.
Any formwork burrs, concrete splashes, etc. must be removed.
“Rexpandit” is simply compressed and pushed into the centre of the joint.
The ends are to be laid tightly butt to butt. No further fixing is necessary.
Alternatively, “Rexpandit” can also be applied to prefabricated elements during production after consultation.
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Expansion joints from10mmJoint width
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Expansion joints up to40mmJoint width
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fromEl 90Fire resistance
Co-Division Manager/Sales Manager
HT Insulation/Fire Protection
Sales + Application technology
HT Insulation/Fire protection
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