BITUMINOUS UNDERLAY CONTROL LAYER
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.
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
Technical data sheets
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|---|---|
| Declaration of performance (DOP) | Download |
Recommendations for installation
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BYTUM 400
| CODE | description | tape | H
[m]
|
L
[m]
|
A
[m²]
|
H
[ft]
|
L
[ft]
|
A
[sft]
|
pcs./pallet |
|---|---|---|---|---|---|---|---|---|---|
| BYT400 | BYTUM 400 | - | 1 | 50 | 50 | 3' 3 3/8'' | 164 | 538 | 20 |
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 | - |
| Dopo invecchiamento artificiale - resistenza a trazione MD/CD | EN 1297 / EN 12311-1 | 450 / 350 N/50mm | 51 / 40 lb/in |
| Dopo invecchiamento artificiale - allungamento | EN 1297 / EN 12311-1 | 35 / 40 % | - |
| Flexibility at low temperatures | EN 1109 | -45 °C | -49 °F |
1.
Composition
| TOP LAYER | non-woven PP fabric |
|---|---|
| compound | bituminous mixture |
| REINFORCING LAYER | PL fabric |
| compound | bituminous mixture |
| BOTTOM LAYER | non-woven PP fabric |
