Underlay membrane and roof protection film WÜTOP^® Thermo ERS

Installation instructions

• Wütop® Thermo ERS is to be laid from the bottom up, parallel to the eaves.


• Wütop® Thermo ERS is fastened to the top third of the overlapping area using hammer tackers and fixed in place with the counter batten. The fastening with hammer tacker nails must be concealed.


• When laying, a minimum overlap of 10 cm must be observed (marking strips).


• Welding with a hot air gun (200 °C-300 °C) or with a solvent welding agent ensures windproof and waterproof connection of the Wütop® Thermo ERS. Please observe the processing guidelines for the solvent welding agent. When welding, the surface must be dry and free of grease and dust. Ensure sufficient contact pressure. Ensure that no standing water can build up in joined areas. Application temperature: +5 °C to +40 °C.


• Openings (chimneys, lifts, skylights, sanitary vents etc.) are run up at least 2 cm above the upper edge of the counter batten using original Wütop Thermo ERS accessories (outer and inner corner pieces, pipe connection and connecting membrane) and bonded securely to the upper edge with WÜTOP Filmfix Plus or Eurasol Thermo HT. Original Wütop Thermo ERS accessories can be processed using solvent welding agent and a hot air gun. A minimum overlap of 6 cm must be observed when connecting elements using Thermo ERS accessories. Cross-drains or drain-off elbows must be positioned on a slope with a sufficient degree of lateral protrusion above openings and built-in components with a width of more than 50 cm. Skylights must be installed in accordance with Austrian standard ÖNORM B 4119 and the respective manufacturer's guidelines.


• For roofs with full fill rafter insulation, Wütop® Thermo ERS can be laid over the roof ridge (minimum overlap 20 cm). With back-ventilated systems and with non-insulated or only partially insulated roofs, the last membrane ends at least 5 cm from the ridge. In this case, ensure sufficient ventilation.


• The standards applicable at the time of installation must be taken into account in addition to state-of-the-art technology.


• Damage to the roofing underlay must be repaired using patches of original membrane.


• The roof covering must be completed no more than 6 months after the Wütop® Thermo ERS has been laid in order to prevent UV damage.


• In accordance with Austrian standard ÖNORM B 4119, nail seals must be installed in all roofing underlays regardless of the roof slope. The width of the nail seal must correspond to that of the counter battens. In the case of counter batten widths in excess of 70 mm, the width of the nail sealing tape must be at least 70 mm. Nail sealing tape that is not bonded to the roofing underlay must exert a suitable amount of continuous pressing force to ensure that it functions correctly.


• The Wütop® Thermo ERS is not an emergency roof, i.e. it does not function as a roof covering.


• Store the rolls in a dark, dry location.

Installation instructions for a roof pitch of 1.5-5°

Installation of roofing underlay as condensation protection and for windproofing purposes under a waterproof roof seal* (e.g. roof waterproofing membrane made of polymer and bitumen, pre-formed metal elements and sheet metal profiles)

General:

• The minimum roof slope of 1.5° must be permanently ensured. Please consider long-term building and component changes (e.g. bending etc.).


• The minimum height of the counter batten must be planned and implemented in accordance with B 4119. We recommend screwing the counter battens into place. The nail sealing tape must be bonded to the breathable membrane.


• Exposure to weathering must be limited to a maximum of 4 weeks.


• All connecting seams must be welded with a hot air gun. Please pay particular attention to the quality of the welding seam. Any small capillary in the welding seam can cause water to enter in the case of standing water. In general, we recommend using a prefabricated roofing underlay, as this features a higher-quality welding seam produced by an automatic machine.


• Where there is a risk of standing water at connection details, the cut edges and welded seams of the roofing underlay must be additionally sealed with 1 C liquid plastic.

Connecting elements (chimneys, skylights, upstands, openings):

The following section describes the installation of a chimney connection. All other elements are to be connected in the same way.

• 1. Cut the outer corner collars so that they overlap by at least 6 cm. To compensate for component movements, a distance of 5-10 mm from the chimney must be allowed for on each side.


• 2. Place two outer corner collars on the chimney and mark the overlap.


• 3. Weld the two corner collars together using a hot air gun and seam roller. Position the overlap so that it is not directed against the direction of the water flow. The width of the welding seam is approx. 4 cm. Repeat steps 1-3 until the desired number of collars are connected.


• 4. Then pull the collar around the chimney as a whole. If this is not possible, the two collars on the lower side of the chimney or slope should be welded together or joined using flexible tape adhesive as a last resort.


• 5. Start by welding the breathable membrane on the upper side of the chimney. Always work from one corner to the other to avoid creases in the middle.


• 6. The lower side of the chimney is the last to be welded as creases here are least likely to result in leaks.


• 7. In the corner area, press all the collar connections flat and weld them. Maintain a distance of 5-10 mm for component movement. Weld open overlaps at the upstand to prevent water saturation. Weld the prefabricated welding seams of the collars again and press them flat so that it is easier to apply the liquid plastic later on.


• 8. Create a seal seam on the upper end of the collar using flexible tape adhesive to seal it to the chimney. Press down slightly with a roller.


• 9. All overlaps must be carried out in line with the direction of the water flow.


• 10. All cutting edges and welding seams of the roof membrane must also be sealed against standing water with FLK 250 1-component liquid plastic. The liquid plastic is applied in a width of at least 6 cm in the middle of the welding seam; for clean edges, the area can be masked with crepe masking tape. The liquid plastic is applied generously using a brush or roller in a single layer of at least 1 mm in thickness. Used crepe masking tape must be removed when wet. Please also observe the processing guidelines for the liquid plastic - especially if the decision is made to use the optional catalyst for accelerated drying.