BITUMINOUS UNDERLAY CONTROL LAYER
BYTUM 750
The BYTUM 750 bituminous underlay control layer provides high mechanical strength and therefore durability. The integrated double tape ensures perfect sealing and fast installation.
BYTUM 750, the self-sealing bituminous underlay control layer.
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 concrete floors and other uneven surfaces.
Documents
Technical data sheets
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| Declaration of performance (DOP) | Download |
Recommendations for installation
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BYTUM 750
| CODE | description | tape | H
[m]
|
L
[m]
|
A
[m²]
|
H
[ft]
|
L
[ft]
|
A
[sft]
|
pcs./pallet |
|---|---|---|---|---|---|---|---|---|---|
| BYTTT750 | BYTUM 750 TT | TT | 1 | 40 | 40 | 3' 3 3/8'' | 131 | 431 | 20 |
Technical Data
| Property | Standard | Tested Values | USC Conversion |
|---|---|---|---|
| Mass per unit area | EN 1849-2 | 750 g/m² | 2.46 oz/ft² |
| Thickness | EN 1849-2 | 0,8 mm | 31 mil |
| Water vapour transmission (Sd) | EN 1931 | 38 m | 0.092 PERM |
| Tensile strength MD/CD | EN 12311-1 | 500 / 400 N/50mm | 57 / 46 lb/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 | class W1 | - |
| Thermal resistance | - | -40 / 100 °C | -40 / 212 °F |
| Reaction to fire | EN 13501-1 | class E | - |
| Resistance to penetration of air | EN 12114 | 0 m³/(m²·h·50Pa) | 0 cfm/ft² at 50Pa |
| Thermal conductivity (λ) | - | 0,2 W/(m·K) | 1.39 (BTU·in)/(h·ft²·°F) |
| Specific heat | - | 120 J/(kg·K) | - |
| Density | - | ca. 935 kg/m³ | - |
| Water vapour resistance factor (μ) | - | ca. 47500 | - |
| UV stability | EN 13859-2 | 4 months | - |
| Exposure to weather | - | 3 weeks | - |
| After artificial ageing - watertightness | EN 1297 / EN 1928 | class W1 | - |
| 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 |
Specifications
Supply and installation of bituminous undertile screen, type BYTUM 750
CE marking according to : EN 13859-1
Property:
– Mass per unit area : 750
– Water vapour trasmission (Sd) (m) : 38
– Maximum tensile force MD/CD (N/50mm) : 500/400
– Elongation MD/CD (%) : 45/50
– Resistance to tearing MD/CD (N) : 200/200
– Watertightness (class) : classe W1
– VOC emission (COV) (%(class A+)) : 0
– Temperature resistance (°C) : -40/+100
– Reaction to fire (class) : classe E
Indicazioni di posa per: PARETE
BYTUM 750 is laid parallel to the dock beam or the floor if laid on a wall. The second layer must be overlapped by at least 15 centimetres. Each layer must be fixed to the substrate with a mechanical fastener. (ex: HAMMER STAPLER, HAND STAPLER o PNEU STAPLER). It is also advisable to overlap the sheets by at least 30 centimetres at the butt joints. In order to achieve correct air and water sealing, we recommend the use of ALU BAND, SEAL BAND, EASY BAND, SPEEDY BAND, SOLID BAND, FLEXY BAND, SMART BAND, PLASTER BAND, DOUBLE BAND, SUPRA BAND, BUTYL BAND, MEMBRANE GLUE, SUPERB GLUE, ECO GLUE, FIRE SEALING, FIRE FOAM, FIRE STRIPE, FRONT BAND UV 230 or in the case of rough surfaces (such as rough OSB) FLEXI BAND, PRIMER SPAY, PRIMER .
Indicazioni di posa per: TETTO
BYTUM 750 is placed parallel to the eaves line, starting from the lower edge of the roof. The second layer must be overlapped by at least 10-20 centimetres to the previous one (depending on the slope of the roof), as indicated on the layout according to UNI 11470:2013. The sheet must be applied on a continuous support with a mechanical fastening device. (ex: HAMMER STAPLER, HAND STAPLER o PNEU STAPLER). Once at the top of the roof, it is advisable for the membrane to protrude beyond the ridge line by at least 30 centimetres to ensure a perfect overlap with the strips of sheet that will overlap on the other side of the roof. It is also recommended that the sheets overlap by at least 30 cm even at the end joints. To achieve correct air and water sealing, we recommend the use of ALU BAND, SEAL BAND, EASY BAND, SPEEDY BAND, SOLID BAND, FLEXY BAND, SMART BAND, PLASTER BAND, DOUBLE BAND, SUPRA BAND, BUTYL BAND, MEMBRANE GLUE, SUPERB GLUE, ECO GLUE, FIRE SEALING, FIRE FOAM, FIRE STRIPE, FRONT BAND UV 230.If there is an integrated double adhesive strip, it can replace the correct air and water sealing.
Composition
| TOP LAYER | non-woven PP fabric |
|---|---|
| compound | bituminous mixture |
| REINFORCING LAYER | PL fabric |
| compound | bituminous mixture |
| BOTTOM LAYER | non-woven PP fabric |
