NCC 10.8.3, solved.
SolarArk solar roof ventilators are a performance solution that meets and exceeds the Deemed-to-Satisfy provisions for roof-space ventilation and condensation management under NCC 2022.
Condensation Management
Why 10.8.3 exists.
Modern airtight, thermally-efficient homes trap more moisture. In roof spaces, heat, humidity and poor air movement create serious durability, energy-efficiency and air-quality risks.
A performance solution
When correctly specified and installed, SolarArk ventilators deliver sustained ventilation rates exceeding passive DTS methods — satisfying NCC 2022 Vol. 1 F8D5 and ABCB Housing Provisions 10.8.3.
Especially Climate Zones 6, 7 & 8
Active convective air exchange reduces moisture retention, thermal stratification and heat-load accumulation in the roof cavity — improving envelope integrity and energy efficiency.
Unobstructed Free Open Area
FOA is the actual area air moves through. SolarArk units measure FOA at a completely unobstructed base opening — where a 400×200 mm eave vent (80,000 mm² gross) may only deliver 15,000–20,000 mm² effective, a SAV-20 delivers 196,349 mm².
The Requirement
NCC 10.8.3 roof-space ventilation.
Minimum free open area per metre of the roof's longest horizontal dimension, by roof pitch.
| Roof Pitch | Required Ventilation Openings |
|---|---|
| < 10° | 25,000 mm²/m at each of two opposing ends |
| ≥ 10° and < 15° | 25,000 mm²/m at the eaves + 5,000 mm²/m at high level |
| ≥ 15° and < 75° | 7,000 mm²/m at eaves + 5,000 mm²/m at high level (+18,000 mm²/m at eaves for cathedral ceilings) |
High-level openings are provided at the ridge, or no more than 900 mm below the highest point of the roof space.
SolarArk ventilator free open areas
| Model | Free Open Area | mm² |
|---|---|---|
| SAV-10B / SAV-10T | 0.055 m² | 55,000 mm² |
| SAV-20 / SAV-20T | 0.20 m² | 200,000 mm² |
| SAV-30 / SAV-40T | 0.10 m² | 100,000 mm² |
| SAV-60T | 0.20 m² | 200,000 mm² |
| SAV-120T | 0.31 m² | 310,000 mm² |
Worked Example
A 20 × 10 m roof at 20° pitch.
How a single SAV-20/20T plus eave vents achieves full compliance.
High-level ventilation
20 m horizontal length × 5,000 mm²/m = 100,000 mm² required
Eave (low-level) ventilation
20 m × 7,000 mm²/m = 140,000 mm² required
Effective flow rate
200 m² roof × ½ × 2.4 m height × 10 ACH = 2,400 m³/hr required
Install the ventilator on the north-facing pitch where possible; use a tilt-panel "T" model for east, south or west-facing roofs. Eave intake must at least equal the ventilator opening area.
Specifying for a project?
Download the full NCC 10.8.3 guide, or have our engineers size a compliant solution for your roof.
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