Call Tommy: 074 174 2583

Email: Tommy@gorational.business

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RATIONAL DESIGNS:

  • Available for ALL of South Africa

  • Full Compliance With SANS

  • Satisfaction Guarantee

  • 10x Cheaper Solution

  • Speedy Alternative

  • 15 years Experience

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Consultation w/ Tommy @ GoRational

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WHAT ARE
Fenestration Calculations?

To satisfy the requirements of the SANS 10400-XA:2021, you need to have a ratio of fenestration area to habitable area equal to or under 20%.


After that there is a sliding scale of specifications you need to apply to your windows and doors in order to satisfy required shading and/or U-Values, and Solar Heat Gain Coefficient values.


The fenestration calculations show you exactly what you need to specify. These are required by local authorities to obtain approval.

Sounds Confusing, Right?

That's why we're here.

We make fenestration calculations simple, affordable, and fast for you so you can stop the math and start the build.

So, here's the deal: If the fenestration calculations tell you that you need fancy, expensive windows, don't worry!

You have another option: You can submit a rational design report.

In this report, your proposed building is compared to a similar reference building that meets the standards of having windows that make up 20% or less of the total area.

Here's the cool part: It's possible that your clever designer or architect has already found ways to save energy in different parts of your building.

So, even if your windows are a bit different, your building could perform just as well, or even better, than the reference building.

But hey, if that's not the case, don't stress!

WE Can Help YOU Find Affordable Ways to Meet The Requirements.

You don't have to splurge on fancy glazing. We'll explore other options to save you money and protect our precious Earth's resources.

With this rational design report, you can not only save on expensive materials and time, but also discover alternative ways to be cost-effective. It's a win-win!

Call Tommy: 074 174 2583

Email: Tommy@gorational.business