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About us

Jim Roskvist

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  • Certifying Plumber and Drainlayer

    • Self-employed plumber and drainlayer for 25 + years

  • Plumbing and drainlaying tutor with more than 20 years experience at tradesman and certifying levels. (Unitec, Manukau Institute of Technology, and Hydraulic Services Consultants Ltd)

  • Graduate Diploma in Higher Education

     

Angus Cathcart

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  • Certifying Drainlayer

    • Self-employed drainlayer for 30+ years

  • Drainlaying tutor with more than 5 years experience at tradesman and certifying levels. (Part time tutor at Unitec)

  • Licensed Building Practitioner

    • Self-employed builder for 30+ years

What We Offer

Certifying Refresher Courses
 

  • Plumbing

  • Drainlaying

We offer six-week plumbing and drainlaying refresher courses for plumbers and drainlayers wanting to sit the Board's Certifying exams. Courses are held at Chesters Plumbing and Bathroom Centre training room in New Lynn.

Short Courses

In-house courses covering:

 

  • Underslab to 'Drainage Principles' (AS/NZS 3500.2)

  • Elevated drainage - 4 floors or less (AS/NZS 3500.2)

  • Single stack systems - 3 floors or less (AS/NZS 3500.2)

  • Roll-over stack systems (AS/NZS 3500.2)

  • Water pipe-sizing for domestic buildings (AS/NZS 3500.1)

  • Design of Domestic Fire Sprinkler systems.

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Tradesman Theory Exams
 

  • Plumbing

  • Drainlaying

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Liam Louw
Merit Award, Certifying Plumbing

Liam received the Merit Award of Excellence from the Plumbers, Gasfitters, and Drainlayers Board for his top mark of 97% in his Certifying Plumbing exam in November, 2022. Another certifying exam trainee, Liam Fox, also achieved 97% in this exam, but was pipped for the award because of Liam’s average marks over earlier plumbing exams.

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Liam Louw pictured with Jim Roskvist.

“I would like to give a shout-out [to,] and acknowledge Jim Roskvist for the recent support he gave 3 of our boys who were struggling to complete the Drainlayer’s Registration Exam. Jim’s thought process and understanding of how to plan, facilitate and cater for all learning styles was both professional, and relevant with current standard practice. We arranged for Jim to take 6 weeks of night classes to help get our boys through their exam . . . they all passed.

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One of our guys had this to say:

“It was awesome, I liked that he was real adaptive to the deficiency report, and his detailed course was on the right track. Super supportive and easy to talk to.”

Tracey Parker, H & H Drainage

Common Compliance Issues

The images below show examples of sanitary plumbing systems that do not meet the requirements of AS/NZS 3500.2.

While these systems may have been approved at inspection stage, they highlight a broader industry challenge - correctly interpreting and applying the standard in real-world installations.

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From a design, contracting and teaching perspective, installing compliant systems is not difficult. It requires:

  • Proper planning

  • A clear understanding of AS/NZS 3500.2

  • Correct interpretation of plans

  • Ongoing professional development

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At TTE, our training focuses on practical application of the standard - ensuring plumbers and drainlayers can confidently design and install systems that meet compliance requirements.

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Raising the standard of workmanship protects not only individual reputations, but the integrity of the wider industry.

Get in Touch

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