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Lattix Mast Selection Guide

433 Boundary St

Spring Hill

Brisbane, QLD 4004 +617 3838 2400

Q-10506.00 Rev A Page | 1

USE OF LATTIX POST SELECTION CHARTS

Step 1 – Determine appropriate Wind Region

In Australia wind zones should be determined from Australian Standard AS/NZS 1170.2:2011 Structural

Design Actions – Wind actions. Figure 4 from the standard has been reproduced below for the

convenience of the reader. Post selection charts have been provided for wind regions A, B & C. Note, if

the sign site is installed in an exposed location, a selection chart for the next higher wind region should

be used.

Wind Region Map - (Artcraft have copied Figure 4 with permission from TMR TRUM Manual Volume 3 ‘’

Design Guide for Roadside Signs ‘’ March 2018.)

Step 2 – Determine Sign Area of proposed sign

433 Boundary St

Spring Hill

Brisbane, QLD 4004 +617 3838 2400

Q-10506.00 Rev A Page | 2

For the proposed sign obtain the sign width (A) and height (B). To calculate the sign area multiply the

width by the height – i.e. A x B = sign area

Step 3 – Calculate the height to centre of pressure

The height to the centre of pressure of the sign is half the sign height plus the clearance from the

bottom of the sign to ground level – i.e H1 = H + B/2

Note that Lattix requires a minimum of 2m clearance so that a light vehicle can run underneath the sign

Step 4 – Select appropriate chart and determine post to use

Single-post selection charts:

If the sign width is less than 2.6m try the single-post selection chart first. For the single-post charts take

a vertical line from the sign area and a horizontal line for the height to centre of pressure to the point of

intersection. The next curve to the right of this point represents the smallest single Lattix post that can

be used.

Multiple-post selection charts:

For signs over 2.6m wide, use the multiple-post selection charts.

Take a vertical line from the area of the sign to intersect with the oblique line representing the height to

centre of sign. From there, take a horizontal line across to the right multi-post selection box to select

the number and size of Lattix posts that can be used. The most economic choice is to use the least

number of posts.

Example 1:

Proposed road sign in Brisbane, not in an exposed location, to be 3.0m wide and 2.2m high with a

ground clearance of 2.6m.

Step 1 – from AS/NZS1170.2 the wind region is B.

Step 2 – The sign area is 3.0 x 2.2 = 6.6m2

Step 3 – The height to centre of sign is H1 = 2.6 + 2.2/2 = 3.7m

Step 4 – Sign width is greater than 2.6m, therefore use multi-post selection chart for Region B (Sht 6)

Take a vertical line at sign area = 6.6m up to an intersection point just below the oblique line H1 = 3.9m.

Take horizontal line across to the box with number of posts. Result is two Lattix 4420 posts.

433 Boundary St

Spring Hill

Brisbane, QLD 4004 +617 3838 2400

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Example 2:

Proposed road sign is a 1.5m wide by 2.2m height located in Rockhampton, Queensland and not in an

exposed location. Clearance below sign is to be 2.1m.

Step 1 – Wind region from AS/NZS 1170.2 for Rockhampton is region C.

Step 2 – Sign area is 1.5 x 2.2 = 3.3m2

Step 3 – Height to centre of sign H1 = 2.1 + 2.2/2 = 3.2m

Step 4 –Sign width is less than 2.6m, therefore try single-post selection chart for Region C (Sht 3)

Take a vertical line from sign area = 3.3m2 to intersect with a horizontal line from H1 = 3.2m. Selection

line to the right is for a single Lattix 4425 post.

433 Boundary St

Spring Hill

Brisbane, QLD 4004 +617 3838 2400

Q-10506.00 Rev A Page | 4

PROJECT: Q-10506.00 NAME DATE

Prepared by: Simon Biggs 28/6/2018

Reviewed/Approved by: Drew Gordon 28/6/2018