waiting for calculations

to the Australian Plumbing Code AS/NZS 3500.3:2021

All these programs are online and free to use. However there are a lot of extra features that require a payment.
Fill out the form below to get a free trial of these extra features.

Logo Roof inspection
Whats in the Extra features.
Should you wish to impress your Client, your Boss, your Certifier, or the significant other, you need to take a look at the "Extra Features".
It also doesn't hurt to have a copy of the calcs for your files, and by the way, there are a lot of other cool things in the extra features.
These include:- Enjoy.
Ken Sutherland B.Tech MIEAust CPEng(Ret)

Great product!!! Many thanks, makes a very dull task very fast and easy!!
engineeringBÜRO www.engineeringburo.com

I haven’t had need to access your site recently until now …… and am very happy to subscribe. Your updated site is brilliant …. and I hope those who use it will subscribe.
Michael (M J Corbett & Associates Pty Ltd)

quite impressed with your work, I just had an inquiry from my architect to modify the gutter design which would involve a recalc of the how many down pipes would be needed, your little program did this within seconds, THANKS !!
Chris (Weiss builders)

I have been using it for a number of years but hadn’t subscribed, I have found the features available since subscribing are very helpful, and feel guilty that I hadn’t payed in the past.
Mike (Powell Building Design)

Thank you for your nice and efficient web-based calculator. We are using your calculators find very useful.
Rashendra Das (Klopfer Dobos Pty.Ltd.)

A big thanks for your fantastic website mate, incredibly helpful tool.
Chris Tyson Hydraulic Design Consultant at Tyson Enterprises

We are saving so much time using your calculators rather than doing everything manually. Thanks!
Chin GandP Consulting Engineers

Great work as always Ken. No roof gutter design shall leave this office without the calculations and justification for sizings.
Jahan Trevena, Principal of McLauchlan & Associates Building Design Consultants.

I’ve tested this with an example (by hand, using 3500.3 charts) and agree with your results
Rowan PSE engineering Just discovered your gutter and downpipe calculator.

Can't believe I didn't know about it before. What a gem and congratulations on a great web app. Now I can refer my clients to this calulator when they question why I need more down pipes on their roofs!
Wonsdor Ung Building Certifier at Agile Approvals.

Love your program, I use it all the time these days since everything residential is more heavily scrutinised.
Glenn Merrigan (bmgmetall.com.au)

What a fantastic website for owner builders! Thank you - took me less than one hour to meet the requirements of my building certifier... Thank you!
Helen (Jagged crow Farm.)

It is all good. I have done my first calculation. PDF is printed. Wow – it takes the worry out of it. Thanks for a wonderful product.
Martin (Design Delight).

Over the years I have asked Ken a few times for some advice in areas, when I was a little unsure myself. Like how much efficiency is lost on an eaves gutter when the downpipe is connected to rear of the gutter and not the base (typically seen in many WA project homes) He has always astounded me with his thorough responses obviously spending many hours undertaking complex mathematical calculations. He is one of the true gentleman in this industry always prepared to help others. I will continue to purchase his software and highly recommend it to others. It saves me many hours of tedious work on each project no matter how I choose to use it. Keep up the good work Ken, I enjoy reading your posts our industry needs more people like you.
Phil Woolhouse , Principal Consultant at Phil Woolhouse Hydraulics

Love your work
Peter Dillon Laser Plumbing Tamworth.

It is a huge benefit in the design industry so thank you very much for designing and formulating the website. I for one, greatly appreciate it!
Sean Bell Hydraulic Services Manager at Floth Sustainable Building Consultants

I've really enjoyed using your program at my work at Lambert & Rehbein.
I really like you're program - I've done about 25 large commercial projects using it.
We really relied on it heavily.
Benjamin Ives Hydraulic Engineer ex Lambert & Rehbein.

Thank you for the website as a resource – it’s outstanding!
James Cibich BE(Hons), LL.B, MIEAust CPEng NER - IMPARTA Engineers

Thanks for a great site and a very useful tool.
I assist the QBCC with plumbing and roofing issues and find your site to be a great assistance in quickly determining downpipes and gutter sizes.
I am in my second year of subscribing to your site and will be using it for many years to come I am sure.
Ben Theslow BT Plumbing Service.

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