Manufacturer of flat roof accessories for drainage, ventilation, penetrations and roof fixing since 1962.
b/s/t GmbH Koch Kunststofftechnologie
83253 Rimsting/ChiemseeNew on Amplifa
About b/s/t
b/s/t GmbH Koch Kunststofftechnologie is a fourth-generation family company based in Rimsting on Lake Chiemsee and has been manufacturing accessories for flat roofs since 1962. The product range includes roof drains, renovation drains, emergency overflows, water spouts, parapet drains, vent outlets, cable and energy penetrations, inspection pipes, vapour barrier connections, field fastening, solar mounting, snow guard systems, lightning protection, fall protection, gravel stop profiles and composite sheets. The products are made from PVC, PP, PE, ALIT (also as a bitumen version) as well as aluminium, stainless steel and PA; most plastic parts are produced in the company's own manufacturing facility in Rimsting. In addition to the standard programme, the company offers custom-made products to drawing or customer specification, such as emergency overflows in special dimensions (e.g. PP emergency overflow RS with up to 1000 mm internal width) as well as painting of emergency overflows in all RAL colours. The company supplies customers in more than twenty countries across Europe and complements its products with technical consulting, calculation services and tender specifications.
- Site
- Rimsting/Chiemsee
- Processes
- Plastics processing of flat roof accessories (in-house production of plastic parts), Special production / custom-made products to customer specification (incl. emergency overflows to, Painting of emergency overflows (available in all RAL colours), Personal technical consulting, Calculation service (emergency drainage, wind suction securing, snow guard systems, solar mounting), Special production / custom-made products, Tender specifications (GAEB), Installation instructions
- Materials
- PVC (polyvinyl chloride), PP (polypropylene), PE (polyethylene), ALIT (material for flat roof accessories, also bitumen version), Aluminium, Stainless steel, PA (polyamide), Butyl (butyl tape, aluminium-butyl tape)
- Founded
- 1962
- Industries
- Flat roof construction, Roof waterproofing, Construction, Solar technology
- 01
Product development and engineering
- 02
Plastics processing in in-house production
- 03
Metal processing (aluminium, stainless steel)
- 04
Custom manufacturing to customer specification incl. manual adaptation
- 05
Painting (RAL colours)
- 06
Technical consulting and calculation service
- 07
Sales and shipping, Europe-wide
Materials and Processes
PVC (polyvinyl chloride)
Main material for roof drains, emergency overflows, vent outlets and penetrations in the flat roof sector.
PP (polypropylene)
Used for emergency overflows, roof drains and water spouts; can also be painted in RAL colours.
PE (polyethylene)
Used for emergency overflows and vent outlets, e.g. with total pipe lengths up to 700 mm.
ALIT
Material for flat roof accessories, also available as a bitumen version for bitumen-based waterproofing systems.
PA (polyamide)
Used e.g. for rain hoods in the accessories range.
Aluminium
Material for gravel stop profiles and metal components.
Stainless steel
Used e.g. for terrace edging profiles and metallic components.
Butyl
Butyl and aluminium-butyl tapes as sealing and processing materials.
Locations
Rimsting/Chiemsee
DEHeadquarters with production (plastics and metal processing)
- Materials
- PVC, PP, PE, ALIT, PA, aluminium, stainless steel
Components
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Plastics processing of flat roof accessories (in-house production of plastic parts)Plastics | – | – | – | – | PVC, PP, PE, ALIT (bitumen-compatible), Aluminium, Stainless steel, PA, Butyl |
| Special production / custom-made products to customer specification (incl. emergency overflows toPlastics | – | 700 mm (max. total pipe length PE × 1000 mm (internal width PP emergency × 60 mm (min. internal height PP | – | – | PE, PP |
| Painting of emergency overflows (available in all RAL colours)Surface | – | – | – | – | PP |
Additional services
History
- 1920er
Great-grandfather worked with paints, waterproofing and putties made from tar and bitumen.
- 1948
Company rebuilt in Rimsting on Lake Chiemsee.
- 1952
First idea to replace bitumen roofing felt with PVC roofing membranes.
- 1962
Foundation stone laid for b/s/t flat roof accessories.
- 2021
Hans-Jürgen Koch passed away; sons Sebastian and Johannes Koch continue to run the company in the fourth generation.