BYTUM 400
BYTUM 400 bituminous underlay control layer is the lightest bitumen-based membrane in our range. Despite its limited thickness, it ensures great mechanical strength and durability thanks to the reinforcing layer.
Description
BYTUM 400, the bituminous underlay control layer that ensures manageability and flexibility.
This bituminous underlay control layer is designed for installation on the outer side of the roof. It can also be used as a vapour control membrane, especially on uneven surfaces such as concrete floors and similar.
Documents
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Technical data sheets
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Recommendations for installation
Technical Data
| Property | Standard | Tested Values | USC Conversion |
|---|---|---|---|
| Mass per unit area | EN 1849-1 | 400 g/m² | 1.31 oz/ft² |
| Thickness | EN 1849-2 | 0,6 mm | 24 mil |
| Water vapour transmission (Sd) | EN 1931 | 22 m | 0.159 US perm |
| Tensile strength MD/CD | EN 12311-1 | 500 / 400 N/50mm | 57 / 46 lbf/in |
| Elongation MD/CD | EN 12311-1 | 45 / 50 % | - |
| Resistance to nail tearing MD/CD | EN 12310-1 | 200 / 200 N | 45 / 45 lbf |
| Watertightness | EN 1928 | compliant | - |
| Resistance to temperature | - | -45 / 100 °C | -49 / 212 °F |
| Reaction to fire | EN 13501-1 | class E | - |
| Resistance to penetration of air | EN 12114 | < 0,02 m³/(m²·h·50Pa) | < 0.001 cfm/ft² at 50Pa |
| Thermal conductivity (λ) | - | 0,2 W/(m·K) | 0.12 BTU/(h·ft·°F) |
| Specific heat | - | 120 J/(kg·K) | - |
| Density | - | ca. 600 kg/m³ | - |
| Water vapour resistance factor (μ) | - | ca. 36000 | - |
| UV stability (1 ) | - | 336h (3 months) | - |
| Exposure to weather | - | 3 weeks | - |
| Watertightness after artificial ageing | EN 1297 / EN 1928 | compliant | - |
| After artificial ageing - Tensile strength MD/CD | EN 1297 / EN 12311-1 | 450 / 350 N/50mm | 51 / 40 lb/in |
| After artificial ageing - elongation | EN 1297 / EN 12311-1 | 35 / 40 % | - |
| Flexibility at low temperatures | EN 1109 | -45 °C | -49 °F |
Composition
| TOP LAYER | non-woven PP fabric |
|---|---|
| compound | bituminous mixture |
| REINFORCING LAYER | PL fabric |
| compound | bituminous mixture |
| BOTTOM LAYER | non-woven PP fabric |
Specifications
BYTUM 400
Supply and installation of bituminous underlay membrane for roof tiles, type BYTUM 400.
Composition
From top layer to bottom layer:
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non-woven PP fabric;
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bituminous mixture;
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PL fabric;
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bituminous mixture;
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non-woven PP fabric.
Properties
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Mass per unit area [g/m²]: 400
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Thickness [mm]: 0,6
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Water vapour transmission (Sd)[m]: 22
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Tensile strength MD/CD [N/50 mm]: 500/400
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Elongation MD/CD [%]: 45/50
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Resistance to nail tearing MD/CD [N]: 200/200
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Watertightness (2 kPa): comply with (EN 1928)
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Resistance to temperature [C°]: -45/100
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Reaction to fire: class E (EN 13501-1)
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UV stability: 336h (3 months)
Standards and certifications
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CE marked in accordance with EN 13859-1
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AUS 4200.1 Class 2
Description
The application surface must be dry, free of dust and grease. Surface elements must be removed so that the membrane is not damaged during application.
Recommended use: The membrane is designed for applications on the exterior side of the roof.
It can also be used as a vapour control membrane on uneven surfaces such as concrete floors.
Installation: Unroll the membrane and fasten each layer to the substrate using a mechanical fastener to ensure installation stability.
Proceed by sealing using tape such as: FLEXY BAND, FLEXY BAND UV, SPEEDY BAND, or EASY BAND.