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  2. AIRTIGHTNESS AND WATERPROOFING
  3. MEMBRANES
  4. BYTUM
  5. BYTUM 750

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
Declaration of performance (DOP) Download
Recommendations for installation

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 3 131 431 20

Technical Data
EN 13859-1
national-classifications AT Önorm B4119 E-do nsk
national-classifications CH SIA 232 V.v.o. H > 90mm UD (g)
national-classifications DE ZVDH USB-A UDB-A
national-classifications FR DTU 31.2 E1 Sd3 TR2
national-classifications IT UNI 11564 P SR2 A
BITUMEN B A SED

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 - maximum tensile force 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