Signfix Calculator

Select a Wind Region

Select a Terrain Category

TC1: Very exposed open terrain with very few or no obstructions, and all water surfaces (e.g. flat, treeless, poorly grassed plains; open ocean, rivers, canals, bays and lakes).
TC2: Open terrain, including grassland, with well-scattered obstructions having heights generally from 1.5 m to 5 m, with no more than two obstructions per hectare (e.g. farmland and cleared subdivisions with isolated trees and uncut grass).
TC2_5: Terrain with some trees or isolated obstructions, terrain in developing outer urban areas with scattered houses, or large acreage developments with more than two and less than 10 buildings per hectare.
TC3: Terrain with numerous closely spaced obstructions having heights generally from 3 m to 10 m. The minimum density of obstructions shall be at least the equivalent of 10 house-size obstructions per hectare (e.g. suburban housing, light industrial estates or dense forests).
TC4: Terrain with numerous large, high (10 m to 30 m tall) and closely-spaced constructions, such as large city centres and well-developed industrial complexes.

Select a Foundation Soil

CLAY_STIFF: Indented by strong finger pressure and can be indented by thumb pressure
CLAY_HARD: Cannot be indented by thumb pressure
SAND_LOOSE: Can be indented by thumbnail
SAND_DENSE: Difficult to indent by thumb nail
SAND_DENSE: Friction Angle > 27 degrees. To be assessed from appropriate investigation
SAND_DENSE: Friction Angle > 30 degrees. To be assessed from appropriate investigation
SAND_DENSE: Friction Angle > 35 degrees. To be assessed from appropriate investigation
SAND_DENSE: Friction Angle > 38 degrees. To be assessed from appropriate investigation

Sign Details

Sign Width (A)

Sign Height (B)

Enter post spacing (A2)

Post Spacing Hints: Standard post spacing 1.8m

Note that minimum spacing for signage systems requiring frangibility is 1.1m for Signfix and 1.85m for Optimast.

AU Wind Regions — Figure 3.1(B) - Wind Region - New Zealand

Cohesive clay soils - Stiff to very Stiff/Hard

Cohesionless sand soils - Loose to Medium

Cohesionless sand soils - Medium Dense to Dense

Cohesionless sand soils - Dense to Very Dense

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Notes On Design Guide: Footing design for cohesive and cohesionless soils is based on Broms method and NZTA P24:2020.

Multiple post signs are to be constructed with a minimum 1.1m spacing between the posts to comply with the frangibility testing undertaking for the Signfix system.

Single post sign supports must only be used where the sign attachment resists rotation as in accordance with the state Authority guidelines.

Design guide is based on poles with aluminium grade 6061+T6

Note that this estimating tools to be used for the purpose of estimation of lightweight statis signage and footing sizes only. This is an uncontrolled file is not a certified design tool. Certification of any signage including footing sizes will remain the responsibility of the estimating tool user. Refer to Information Sheet for further information regarding Warranty.
Design Basis: The Signfix wind charts are developed with the following assumptions:

Safe failure mode is important including design for support post yielding and bending prior to failure of the sign face and its attachment to the posts.

Importance Level 2 for large roadside signs (panel area > 4.7m2) and 1:250 average recurrence interval in accordance with NZTA P24:2020.

Importance Level 1 for small roadside signs (panel area <= 4.7m2) and 1:50 average recurrence interval in accordance with NZTA P24:2020.

Design spreadsheet must not be used for overhead or VMS signs.

Design spreadsheet has been developed for Region N1, N2, N3 and N4.

For exposed locations or where the failure of the post is deemed to be more hazardous to road users, we recommend selection of the next post size higher to account for higher wind speeds or use an additional pole.

Pressures are designed based on a Cshp from Section B.2 with AS/NZS 1170.2 for "Freestanding hoardings and walls"

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