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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureSealing & InsulationWynauSIAG SCHWARZ AG
SIAG SCHWARZ AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of SIAG Schwarz AG is the manufacture and distribution of products for building insulation and airtightness, particularly cellulose insulation and airtightness testing. The company also offers comprehensive services and products for the construction industry, such as roof, wall and window insulation, as well as machine technology.

AI-generated
Offering

Products & services

Industry:Sealing & Insulation
✓ Offered9
Cellulose insulation
Natural thermal insulation made of cellulose fibres for roofs, walls and building services; blown in without joints, moisture-regulating, fire-resistant and designed for summer heat protection.
Air-tightness systems
Air- and wind-tight systems for building envelopes; protection against leaks, energy losses, moisture, draughts and noise, including solutions for roof, wall, windows and plinth.
Air-tightness testing
Blower-Door test procedure to determine the air permeability of buildings; final measurement and in-building-phase measurements to check leaks, the n50 value and construction quality.
Roof insulation from the outside
Insulation of pitched and flat roofs from the outside with cellulose; including vapour barrier, doubling of the rafters, blowing-in and solutions for covered roofs.
Facade insulation
Insulation of solid-masonry façades as well as rendered or ventilated façades with cellulose; with timber substructure, plaster supports and blown-in insulation.
Window installation
Sealing of construction joint gaps during window installation with window tapes, air-tight on the inside and driving-rain-tight on the outside; for solid construction and timber frame construction.
Plinth sealing
Products and guide for the planning and execution of plinth connections; solutions against splash-water and rain damage as well as for complex transitions.
Building services insulation
Blown-in insulation for buffer tanks and ducts; seamless insulation of any thickness, installation at a later stage, adaptation to installations and reduction of noise transmission.
Products for air-tightness and insulation
Roof membranes, vapour barriers, adhesive tapes, sealing compounds, window tapes, plinth solutions, windproofing and blowing-in technology for processing on site.
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4.2/5

SIAG SCHWARZ AG

Trust & reputation

ranQ Trust Score of SIAG SCHWARZ AG: 4.2 out of 5.0

Trust Score4.2/ 5.0

Very high

x

Data basis 96% · As of October 2026

SIAG SCHWARZ AG scores 65.8 out of 100 points in the Reputation area of the ranQ Trust Score. This area carries 42% of the weighting.
x
CriterionValueWeight
  • Review quality: The average rating across all connected sources, smoothed against the industry mean. So 5.0 stars from three reviews do not outrank 4.7 from three hundred.67.424%
  • Review volume: The number of reviews across all sources. The scale is logarithmic: the first reviews count the most, and the maximum is reached at 50 reviews.58.610%
  • Review recency: The age of the most recent review. Two-year-old reviews deliberately sit in the middle, because that is normal for Swiss SMEs. Only after three years without a new voice does the value drop markedly.70.08%
SIAG SCHWARZ AG scores 89.3 out of 100 points in the Substance area of the ranQ Trust Score. This area carries 28% of the weighting.
x
CriterionValueWeight
  • Establishment: Years since founding or brand launch, logarithmic. The maximum is reached at 15 years.100.012%
  • Company size: The headcount band, researched by ranQ or stated by the company. It is scored in steps rather than by head count, because the data only provides bands.70.07%
SIAG SCHWARZ AG scores 85.0 out of 100 points in the Identity area of the ranQ Trust Score. This area carries 22% of the weighting.
x
CriterionValueWeight
  • Verification: Official register entry (commercial register with UID or professional-body record, 55 points), confirmed domain (20 points) and confirmed ranQ profile (up to 25 points, depending on completeness).85.022%
SIAG SCHWARZ AG scores 71.4 out of 100 points in the Visibility area of the ranQ Trust Score. This area carries 8% of the weighting.
x
CriterionValueWeight
  • Website authority: Ahrefs' Domain Rating measures, on a scale of 0 to 100, how strongly a website is linked from other websites. For Swiss SMEs the range up to 40 is typical; the maximum is reached at 35.71.44%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

SIAG SCHWARZ AG reaches a ranQ Trust Score of 4.2 out of 5.0 — rated «Very high». The rating draws, among other things, on 4.4 out of 5 stars from 9 customer reviews. The data basis is 96%, so the score is backed by part of the criteria. As of October 2026.

The Trust Score cannot be bought and is calculated from publicly verifiable data.

Reviews

Aggregated rating

Aggregated rating
4.4
of 5

Aggregated from 9 reviews across all connected sources

Sources
GGoogle4.49
★TrustpilotSoon
PProvenExpertSoon

Further sources are added continuously and factored into the ranQ Rating.

Knowledge

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Location

Untere Einschlagstrasse 3
4923 Wynau
Opening hours
Mon
07:15 - 12:00, 13:15 - 17:00
Tue
07:15 - 12:00, 13:15 - 17:00
Wed
07:15 - 12:00, 13:15 - 17:00
Thu
07:15 - 12:00, 13:15 - 17:00
Fri
07:15 - 12:00, 13:15 - 16:30
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-107.464.157
Founded
1993 · 33 years
Last commercial register change
June 2, 2025
Employees
11 to 20
Legal form: Graded by liability and disclosure. The weight is kept small: a sole proprietorship is not a dubious company, it is just liable differently.
100.0
6%
  • Branch offices: Branch offices linked in the commercial register. Having none is normal and costs no points.70.03%
    • Full methodology

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