Permeable, weldable roof lining strips
- Reliable seam tightness: homogeneously weldable as part of the SOLITEX WELDANO 3000 system
- Can be used flexibly: also suitable for large counter battens
- Easy to work with: robust with extremely high tear-resistance
- Protects structural elements against dampness: diffusion-open, rainproof against driving rain, and hail-resistant
- Can be easily adapted using a knife or scissors
Areas of application
For reliable sealing around counter battens as part of the SOLITEX WELDANO 3000 system.
Planning and construction guidelines
The difference between rainproof and waterproof roof linings
Roof linings serve as an independent sealing layer underneath the actual roof covering. They are installed as an additional measure to ensure either rainproofing or waterproofing of covered roof structures if the roof pitch is less than the standard roof pitch.
Roof linings are installed on a subsurface with sufficient load-bearing capacity, e.g. on even decking consisting of solid wood or wood-based panels with a pressure resistance of ≥100 kPa (≥14.5 psi) at 10% strain and/or a surface layer with a density of ≥150 kg/m³ (≥ 9.4 lb/ft³).
In Germany, the requirements and specialist regulations that apply to roof linings are published by the Central Association of the German Roofing Trade (ZVDH). Rainproof or waterproof roof linings are necessary if the roof pitch of the roof covering is less than the standard roof pitch of 8° (1.6:12) to 12° (2.5:12). A rainproof roof lining (Class 2) is installed when a maximum of one additional increased requirement applies. If there is more than one additional increased requirement, a waterproof roof lining (Class 1) is necessary.
One fundamental difference between rainproof and waterproof roof linings is the arrangement of the counter battens. On rainproof roof linings, the counter battens are installed above the rainproof underlay, see Fig. 1.
Any precipitation water that enters must also be drained off in a reliable manner around the counter battens. In the SOLITEX WELDANO 3000 system, this is achieved by installing TESCON NAIDECK mono nail sealing tape beneath the counter battens.
Fig. 1: Rainproof roof lining: Counter batten with nail sealing tape on the seal membrane (Switzerland: standard design for exceptional loads)
In the case of waterproof roof linings, the counter battens are also integrated into the sealing, e.g. by installing the surface roof lining membrane over the counter battens. With regard to installation, however, it is often easier to first install the membrane flat on the decking, and then to fasten the counter battens and weld a SOLITEX WELDANO-S 3000 sealing strip over them, see Fig. 2.
Important: The counter battens must be dry and chamfered on their upper side (≥ 3 mm (1/8")) when they are installed. Ideally, kiln-dried battens should be used.
For waterproof roof linings, the number of feed-throughs should be kept to the minimum necessary. These must then be sealed to a sufficient height above the roof lining membrane and stuck or welded to the penetrating component in a waterproof manner, in accordance with the regulations.
Openings in the ridge area are not permitted on waterproof roof linings. In contrast, openings in the ridge area can be included on rainproof roof linings if an appropriate design structure is implemented.
Rainproof and waterproof roof linings can be implemented in a practical, reliable manner using the SOLITEX WELDANO 3000 system.
Fig. 2: Waterproof roof lining: Counter batten integrated into the sealing layer (Switzerland: possible additional measure)
Classification of membranes in Germany according to ZVDH
|Designation as per ZVDH||Type of counter batten inclusion||Formation of seams and joints||Class|
|Rainproof roof lining||Installed flat beneath the counter batten and sealed with TESCON NAIDECK nail sealing tape||Homogeneously welded using the WELDANO TURGA system solvent welding agent or a hot air gun||2|
|Waterproof roof lining||Guided over the counter batten or covered with SOLITEX WELDANO-S 3000 and welded||Homogeneously welded using the WELDANO TURGA system solvent welding agent or a hot air gun||1|