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FAQ
Q: Which welding temperature should be used to weld Polyfin / O.C.-Plan plastic waterproofing membranes?
A: In order to achieve an ideal result the welding temperature should be approx. 550 C - 650C (Welding window 350C - 650 C)
Q: Which welding machines are suitable for the welding process?
A: All welding machines which are suitable for welding plastic waterproofing membranes and show the following technical features can be used for the welding of Polyfin and O.C.-Plan

Hand welding machines:

- 230 Volt / Heat output > 1400 Watt
- Continuously adjustable temperature up to + 650C
- with wide-slit nozzle 2 mm x 40 mm

Welding machines:

- 230 Volt / Heat output > 3500 Watt
- 400 Volt / Heat output > 5200 Watt
- Continuously adjustable temperature and speed
- Width of nozzle and pressure roller should be 45 mm
Q: Is it possible to weld already applied roof material with new material?
A: New material can be connected with already applied material. Before doing this it can be necessary that the surface of the already applied material has to be cleaned mechanically (the necessity for this has to be prooved by a test welding and test of the welding seam as well as by a peel test). Debris and dirt in the welding area have to be removed with a wire brush.
Q: How can I check if the seam has been welded correctly?
A: Before commencing work test welding should be completed to determine the ideal welding parameters and to ensure welding quality. A seam control can be done by using a suitable hook and by a peel test. Both seam control and peel test can only be done after sufficient cooling-down of the welding seam. The membrane temperature should then be < 20 C.
Q: Which type of membrane has to be used for which kind of application?
A: There are different types of membranes for different kinds of application. For loose laying and mechanical fixing on insulation unbacked membranes (Polyfin 3016 and 3020 / O.C.-Plan 3020), ie. without polyester fleece backing can be used.

Backed membranes (Polyfin 4230 / O.C.-Plan 4230), ie. with a 150-250 g/m polyester fleece backing are used on rough roof decks such as concrete, timber, etc. or for bonded application.
All membranes have a central glass fleece which serves as reinforcement.
Q: Does the term "upstand height 15 cm" refer to the waterproofing layer or to the top of the paving?
A: The upstand height of 15 cm for roofs of up to 5 / 8,8 % resp. 10 cm for roofs of more than 5 / 8,8 % always refers to the height of the top layer. When loose laying without ballast the waterproofing membrane is the reference height. The reference height of gravelled, green or paved roofs is always the top of the final layer, eg. the top edge of gravel, landscaping or of the pavement at terraces and balconies.
Q: For which application are Polyfin 1020 and O.C.-Plan 1025 used?
A: Polyfin 1020 and O.C.-Plan 1025 are homogenous materials without reinforcement. These materials are used for corner protection and for the sealing of penetrations. As this homogenous material is very stretchy and has no reinforcement it is not suitable for the sealing of the main surface area and upstands, eg. dome-lights, wall- and parapets.
Q: Is it possible to combine the products Polyfin and O.C.-Plan?
A: Although FPO and ECB are totally different raw materials it is possible to weld both materials to each other.
Q: When is a roof construction defined as "Hard Roofing"?
A: "Hard roofing" are all roof constructions which are listed in DIN 4102, part 4 or have a valid approval acc. to DIN 4102, part 7 or DIN V ENV 1187. We have tested all customary roof constructions and have all necessary approvals available. Any roof constructions fully covered with at least 5 cm gravel 16/32 or covered with at least 4 cm thick concrete slabs or other forms of paving are defined as "Hard Roofing". For green roofs the roofer has to ask the manufacturer of the green roof construction for an approval of "Hard Roofing".
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