W400

Name: W400
Brand: NEXLER
SKU: W-PAM07-T1D8A-NX1R-1500

Top layer bituminous felt

Application:

Multi-layer coverings for flat roofs on stable substrates
Multi-layer coverings for pitched roofs

Properties:

Traditional top layer bituminous felt on a building cardboard
Fixed with asphalt adhesives and mechanically

Available packaging:

15 m

Type of reinforcement	building cardboard
Top finishing	coarse grained
Low temperature flexibility	≤ 0 °C
Width	≥ 0,99 m
Straightforwardness	≤ 20 mm per 10 m roll length
Reaction to fire	class E
Watertightness: waterproof at a pressure	≥ 10 kPa (method A)
Basis weight	2,0 kg/m² ± 15%
Durability: flow resistance at elevated temperature	(80 ± 10)°C
Maximum tensile force: - longitudinal extension - transversal extension	500 ± 300 N/50 mm (3 ± 2) % 350 ± 200 N/50 mm (3 ± 2) %
Resistance to tearing: - longitudinal - transversal	70 ± 30 N 70 ± 30 N
Dimensional stability	≤ 0,5%
Reference document(s)	EN 13707:2004+A2:2009

On roofs with a slope of more than 20%, two layers of NEXLER W400 bituminous felt are required, while on roofs with a slope of 3% or more, three layers of bituminous felt are required. In individual roof covering layers, the bituminous felt sheets should be shifted relative to each other by 1/2 of the sheet width in the case of two-layer roof covering, and by 1/3 of the sheet width in the case of three-layer roof covering.
Do not carry out insulation work during strong winds and precipitation.
The substrate should meet the following requirements:
- dry substrate (without visible traces of moisture and darkening caused by moisture, the humidity of the concrete or cement finishing coat substrate must not exceed 6% and the humidity of the plank substrate must not exceed 21%),
- clean substrate (the surface is free of dust, oil stains, grease and other contaminants),
- smooth substrate (local unevenness and cavities in the surface of concrete do not exceed ± 5 mm),
- even substrate (the gaps between the surface of the substrate and a 4 m long patch placed on the concrete substrate do not exceed 10 mm),
- roof slope inclination min. 3%.
Before installing NEXLER W400, it is recommended to prime the old bitumen coating with solvent-based asphalt agents, e.g. NEXLER Penetrator G7, or a water-based asphalt preparation, e.g. NEXLER BITFLEX Primer. Substrates made of underlayer bituminous felt do not require priming.
The NEXLER W400 bituminous felt should be fixed to the previously installed underlayer bituminous felt or to the primed old bituminous felt covering. The bituminous felt can be installed using nails and washers directly to the wooden substrate, provided that the overlaps of the felt are glued with asphalt adhesive, which should also be applied to the visible nails and washers.
NEXLER W400 bituminous felt should be glued using only asphalt adhesives in accordance with the recommendations of their manufacturers. When using cold-applied asphalt adhesives, e.g. NEXLER Cold Glue, ensure sufficient time for the solvents contained in the applied layer of asphalt adhesive to evaporate (from approx. 30 minutes to 2 hours in summer and more in periods when the ambient temperature is approx. +10°C). NEXLER W400 bituminous felt and cold-applied asphalt adhesives for gluing bituminous felt should not be used at ambient temperatures below +10°C. The application temperature of hot-applied asphalt adhesive should be between +160°C and +180°C.
The bituminous felt sheets should be joined with overlaps of no less than 10 cm in width and the length of the glued roofing felt section must not exceed 8 m. On roofs with a slope of less than 30%, attach the roofing felt strips parallel to the eaves and on roofs with a slope of more than 30% perpendicular to the eaves.
Before use, please read the application details in the product's Technical Data Sheet.