NIKOLAUS BOLKE DAHMEN
Santa Rosa
Summary
With a comprehensive background in roofing technology, specializes in evaluations, cost analysis, and material assessments. Proficient in utilizing drones for accurate data collection, ensuring project safety and integrity. Combines technical expertise with collaborative efforts to support high-quality roofing and solar installations.
Overview
41
41
years of professional experience
1
1
Certification
Work History
Roofing Estimator
Sunshine Gutters & Roofing
El Cerrito
03.2026 - 05.2026
- Evaluated project specifications to develop accurate cost estimates for roofing projects, ensuring competitive bidding.
- Reviewed blueprints and architectural drawings to assess project needs, enabling informed cost evaluations.
- Collaborated with contractors to gather materials and labor requirements, facilitating precise bid submissions.
- Prepared detailed proposals outlining project scope and pricing for clients.
Roof Technician / Surveyor
Sunrun, Inc.
San Francisco
06.2017 - 07.2025
- Conducted complex rooftop evaluations to assess slope, structure, and integrity, ensuring suitability for solar installations.
- Inspected roofs for deterioration or damage, coordinating repairs to uphold safety and performance standards.
- Partnered with installation teams to ensure safe mounting conditions and alignment with blueprints and load requirements.
- Operating drones and digital measurement equipment to capture accurate data for design, engineering, and layout teams.
- Compiled inspection reports with measurements, photographs, and material notes for effective project planning.
- Communicated technical findings to project managers and engineers to support design adjustments and efficient planning.
Roof Technician / Inspector
Solar City
San Francisco
03.2013 - 06.2017
- Conducted pre-installation inspections for residential and commercial projects, ensuring safety compliance and project readiness.
- Assessed roof readiness and structural integrity before installation, mitigating risks of project delays and enhancing safety.
- Evaluated roofing structures, identifying any damage, leaks, or weaknesses that could impact installations or performance.
- Conducted roof measurements using specialized tools to support engineering design and material estimating requirements.
- Coordinated with onsite crews and project managers to ensure seamless installation sequencing and adherence to technical specifications.
Roofing Technician
Various Companies
Düsseldorf
01.1985 - 09.2012
- Installed roofing materials according to specifications and safety standards.
- Utilized diverse roofing materials, including tile (concrete, clay, metal), slate, SBS, TPO, and EPDM, to ensure effective application across various roofing systems, such as Bauder and BUR.
- Conducted inspections of roofs for damage and necessary repairs.
- Assisted in the removal of old roofing systems safely and efficiently.
Education
Masterʼs Degree - Structural Calculation in Building Structure / Roofing
HWK Düsseldorf
Germany05-2017
Highschool - Construction Engineering
Private Highschool
Germany05-1983
Skills
- Roof inspections
- Material assessments
- Roofing materials evaluation
- Structural calculations
- Site measurement techniques
- Blueprint reading
- Estimation software usage
- Technical reporting
- DroneDeploy flight operations
- Safety compliance and readiness
- Workday proficiency
- Google Workspace skills
- Microsoft Office Suite proficiency
- Client relationship management
Certification
- FAA Part 107 License - Certified Drone Operator for Roof Measurement and Progress Assessment
- OSHA 30 certificate
- Valid California Driver's License - Clean Driving Record
Languages
German
Professional
Timeline
Roofing Estimator
Sunshine Gutters & Roofing
03.2026 - 05.2026
Roof Technician / Surveyor
Sunrun, Inc.
06.2017 - 07.2025
Roof Technician / Inspector
Solar City
03.2013 - 06.2017
Roofing Technician
Various Companies
01.1985 - 09.2012
Masterʼs Degree - Structural Calculation in Building Structure / Roofing
HWK Düsseldorf
Highschool - Construction Engineering
Private Highschool