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Using a string line and tape measure accurately mark fence post holes with a spacing of 2410mm between posts.  Dig the post holes to the specified size and depth.  Concrete the posts into position, ensuring that they are plumb and at the correct spacing.  Allow the concrete to set.
 
Insert Matrix floating brackets into the ends of the 40x40x1.6mm square tube picket fence rails. Position the fence panel at the correct height relative to the posts, and attach the brackets to the posts using self drilling screws. 
 
IMPORTANT: ensure that each Matrix floating bracket is at the top of the opening in the end of the rail before attaching it to the post.
 
Matrix floating brackets will allow the rails to move up and down as pickets expand and contract with changes in ambient temperature.  Incorrect installation will prevent or restrict this movement, which will void the warranty.
NOTE: 
 
Picket fence panels are usually supplied pre-assembled and ready to install onto posts.
 
We use 2 rails for pickets 1200mm high or less, and 3 rails for pickets over 1200mm high.
 
A slotted Colorbond® plinth 34mm deep x 113mm high is available for fitting at the bottom of the pickets.
 
For domestic installations, the pickets are ususally attached from behind using concealed self-tapping screws.
 
For commercial installations, the pickets are generally attached to the rails from the front through pre-drilled holes in the pickets and the rails using galvanised countersunk screws which are powder coated to match the pickets.  Standard or security screws are available.