b/s/t

What b/s/t does

b/s/t GmbH is a privately held German manufacturer of accessories for flat roofs, in continuous operation since 1962. The company designs, produces, and supplies a broad category of physical building-envelope components — including drainage, ventilation, sealing, fastening, fall protection, and snow-guard systems — manufactured primarily from PVC, PP, PE, PA, and aluminium. Its portfolio is organized around engineered sub-brands such as ALIT (aluminium-based systems) and Barrial (fall protection), supplemented by specialty items such as bituminous-membrane-compatible leaf guards and engineered-to-order custom products.

The business operates a B2B go-to-market model: customers are trade buyers — roofing contractors, construction companies, public institutions, and freelance tradespeople — served through a trade-registration-gated online shop and a direct sales presence at industry trade fairs (e.g., DACH+HOLZ 2024). Geographic focus is the DACH region (Germany, Austria, Switzerland). Pricing is list/catalog-based rather than contract-based with named anchor accounts, and the company has not disclosed funding rounds, M&A activity, or AI/data capabilities in the available material.

Name

b/s/t

Legal name

b/s/t GmbH

Website

https://bst-gmbh.de

Company type

Private

Founded year

1962

Operating status

Operating

Headcount range

11–50 employees

Short description

b/s/t GmbH is a privately held German manufacturer, founded in 1962, that produces flat-roof accessories — drainage, ventilation, sealing, fastening, fall protection, and snow-guard systems in PVC, PP, PE, PA, and aluminium — for B2B trade customers across the DACH region.

Ownership category

akta.pro rank

Product category

Flat Roof Accessories / Building Envelope Drainage Components

NAICS

Roofing, Siding, and Insulation Material Merchant Wholesalers (42333)

SIC

Asphalt Paving & Roofing Materials (2950)

akta.pro primary industry

Flashing, Edge Metal & Roof Accessories (IMADAFAJ)

akta.pro secondary industry

Roofing Adhesives, Sealants & Leak Repair (IMADAOAF)

Keywords

• Flat roof drainage
• Roof accessories
• Waterproofing components
• Fall protection systems
• Snow guard systems

Headquarters

HQ city

Rimsting

HQ country

Germany

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. Flat Roof Accessories Sales: One-time product sales of flat roof drainage, ventilation, sealing, and accessory products. Products include drains, vents, cable ducts, leaf guards, fastening systems, and related components. Sales through B2B e-commerce platform requiring trade customer registration.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels4 records

Core offering

b/s/t GmbH manufactures and sells a comprehensive range of flat roof accessories for drainage penetration and waterproofing applications. The portfolio includes flat roof drains, emergency overflow drains, parapet drainage, vents, cable ducts, vapour barrier connections, fastening systems, lightning protection, fall protection systems, snow guard systems, solar panel mounting, flashing kits, gravel stop rails, and processing materials. Products are made from PVC, PP, PE, PA, and aluminium materials and sold exclusively to trade customers via a registered B2B online shop.

Product overview

BST GmbH (b/s/t) is a German manufacturer offering a comprehensive portfolio of flat roof accessories for drainage penetration, established in 1962. The product range includes core drainage products (flat roof drains, emergency overflow drains, parapet drainage) and supporting systems (vapour barrier connections, flat roof vents, cable ducts, moisture control). The portfolio extends to complementary systems including lightning protection, solar panel fastening, fall protection (Barrial guardrails, Primo systems), snow guards, flashing kits, and gravel stop rails. The company also provides processed materials (PVC pastes, welding solvents, butyl tapes, PVC corners) and specialty custom production. An online calculation tool enables drainage capacity calculations for emergency overflows and water spouts. The business operates as a B2B e-commerce platform serving trade customers including entrepreneurs, traders, freelancers, and public institutions.

Differentiator

Problem solved

Functional benefit

Brands

• ALIT: Product line featuring aluminium-based components including ALIT Deck Drain, ALIT Ventilation Duct, ALIT Cable Duct, ALIT Control Pipe, ALIT Parapet Drain, and ALIT Emergency Overflow Drain products.
• Barrial

Products and services

• Flat Roof Drains Drainage solutions for flat roofs in PVC, PP, PE, and ALIT materials, including retrofit drains and side-outlet drains in various configurations. Designed for trade customers and roofing contractors requiring weather-tight roof drainage installations.
• Emergency Overflow Drains Safety drainage products for emergency water overflow including PVC and ALIT variants in R, S, and RS configurations, with RV water dam versions in PP and PE materials. Designed for heavy rainfall event management on flat roofs.
• Parapet Drainage Drainage products for parapet walls including PVC parapet drains (Premium and standard), PP and PE variants, ALIT versions with bitumen compatibility, and spout/parapet drain RS products. For trade customers and roofers installing drainage at parapet transitions.
• Flat Roof Vents Ventilation products for flat roofs including PVC, PP, PE, and ALIT ventilation ducts (WD type), vents (WD type), pipe ducts (KD), and cold roof vents (KD). For trade customers requiring roof ventilation and vapour pressure equalisation.
• Cable Ducts Cable routing products for flat roofs including PVC, PP, PE, and ALIT cable ducts and energy supply ducts in WD and KD variants. For trade customers installing cable and energy supply penetrations on flat roofs.
• Vapour Barrier Connection Connection solutions for vapour barriers including PVC elbow pipe sockets, deck drains, ALIT variants, and parapet connections for sealing membrane joints. For trade customers sealing vapour barrier penetrations on flat roofs.
• Moisture Control Control pipe products for monitoring moisture in flat roofs, available in PVC, PP, PE, and ALIT materials with bitumen variants. For trade customers requiring moisture monitoring access points in flat roof assemblies.
• Fall Protection Systems Safety systems for roof work including Barrial self-supporting and fix guardrail systems, corridor escape and maintenance walkways, Panorama self-supporting systems, Primo fall protection systems for various deck types (concrete, timber, OSB, metal), thermal insulation hoods, self-retracting lifelines, equipment bags, cabinets, rescue kits, and safety bundles. For construction companies and contractors requiring rooftop worker safety systems.
• Snow Guard Systems Snow retention products including complete snow guard systems (Type 1 for corrugated metal decks, Type 2 for timber decks) and PVC snow stop devices. For trade customers installing snow retention on flat and low-slope roofs.
• Solar Panel Fastening System Mounting solutions for solar panels including solar panel fasteners, mounting tools, universal screws BHS, and universal posts SA. For trade customers and solar installers mounting PV systems on flat roofs.
• Lightning Protection Lightning protection components including lightning conductor holders BSH and PVC, PP, PE lightning conductor flashings. For trade customers integrating lightning protection into flat roof installations.
• Flashing Kits Flashing solutions including PVC multi-flanges with optional shrink tubes and pipe covers. For trade customers sealing pipe and penetration flashings on flat roofs.
• Fastening System Installation hardware including PVC discs, universal screws BHS, lightweight concrete screws in stainless steel A2, sealing washers, dowels, and installation adaptors. For trade customers securing flat roof accessories to the building structure.
• Extension Element - galvanised Galvanised extension elements for extending drain and pipe installations on flat roofs. For trade customers requiring additional height or depth in drain assemblies.
• Accessory Parts Supporting components including universal leaf guards, attica leaf guards, anti backflow seals, thermal insulation tubes, weather caps, control pipe caps, renovation covers, elbow pipes, socket pipes, pipe connectors, shrink tubes, sealing plugs, and universal heating elements. For trade customers completing flat roof installations.
• Coated Metal/Profiles PVC-coated metal sheets and coils including table ware (panels), baby coils (1m x 30m), and jumbo coils (1m x 225m) in light grey and anthracite colors. For trade customers fabricating coated metal flashing and edge profiles.
• Gravel Stop Rails Edge restraint systems for gravel and paving including aluminium gravel stop rails (PVC coated in 65mm and 90mm), aluminium universal gravel stop rails (80/100), and stainless steel universal paving border rails. For trade customers installing gravel edge retention on flat roofs.
• Processing Materials/Aids Installation consumables including liquid PVC paste (seam sealing paste) in various sizes and colors, THF welding solvent, gravel bonding adhesive, PVC cleaner, welding brushes, wash bottles, PVC corners (internal, external, skylight variants), and butyl tapes (DS and aluminium variants). For trade customers performing PVC welding and sealing during flat roof installations.
• Specialty Production Custom manufacturing services for special/bespoke flat roof accessory products tailored to specific project requirements. For trade customers and construction companies with non-standard flat roof accessory specifications.

Named customers3 records

Segments4 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Scale indicators2 records

Recent moves5 records

Expansion highlights5 records

Broad incumbents

• Geberit: Swiss-listed manufacturer of sanitary and drainage systems with significant roof and building drainage exposure. Competes with b/s/t in drainage and plumbing penetration categories but at vastly larger scale and broader portfolio.
• ACO Passavant: Large European manufacturer of drainage, separation, and roof/building exterior water management systems. Overlaps with b/s/t in flat roof drainage but operates at significantly greater scale across multiple product categories and geographies.
• Sika Deutschland: Global construction chemicals and sealing systems manufacturer with a strong flat roof waterproofing portfolio including drains and penetration accessories. Overlaps with b/s/t in sealing and roof waterproofing accessories but as part of a much broader chemicals platform.
• Kingspan Group: Global building envelope manufacturer with insulation, roofing, and drainage accessory offerings. Adjacent competitor to b/s/t in flat roof accessories and fall protection categories but operating at multinational scale.
• BMI Group (Braas/Icopal): Major European roofing systems manufacturer offering flat and pitched roof solutions including drainage and accessory components. Competes with b/s/t for flat roof specifications but bundles accessories into full system sales.

Direct peers

• Loro-X: German manufacturer of roof and balcony drainage systems, rainwater management, and emergency overflow solutions. Direct niche competitor to b/s/t in flat roof drainage with overlapping DACH trade customer base.
• Dallmer: German specialist in drainage systems including flat roof and balcony drains with extensive drain accessories. Closely mirrors b/s/t's product mix around roof drains and parapet drainage, serving plumbing and roofing trades in German-speaking markets.
• Sita Bauelemente: German manufacturer specializing in flat roof drainage, emergency overflow, and roof penetration accessories. Directly comparable to b/s/t in product category, target customers (roofing contractors), and B2B go-to-market focus on the DACH region.
• Grumbach: German manufacturer of flat roof and balcony drainage products, vents, and roof accessories. Comparable niche specialist competing with b/s/t in DACH flat roof drain, vent, and penetration accessory categories.

Emerging players

• Jörg Schneider (Schneider Abdichtungstechnik): German niche manufacturer of flat roof sealing, drainage, and penetration accessories. Comparable emerging specialist competing for the same trade contractor specifications as b/s/t in the DACH market.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/b-s-t-gmbh-koch-kunststofftechnologie

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about b/s/t