Fencing with long posts - behind a retaining wall? Advise

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19 Feb 2014
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Hi

We need to put a fence up on our boundary and could do with some suggestions as to how to do it! There used to be a garage on our property (at the boundary) that we demolished and decked over. The retaining wall for the garage is still under the decking, and drops down to ground level on our neighbour's side, and also to the back of our decked area (the garden slopes away from the house). There is a height difference between our finished deck level and our neighbour's garden of about 1.4m. The photos show a side view of the boundary, from the decking level and from the opposite end, from ground level. In the decking photo, our decking is on the left, the neighbour's garden and pergola are on the right. (They used to hang bamboo screens to hide the garage but these have blown down.)


We have had builders and joiners suggest several things:

Use bolts to fix 3m 100mmx100mm wooden posts to the garage base, with 1.8m 'above ground' and the remaining attached to the garage base, with large lightning bolts/thunderbolts or similar. Then attach wooden H fence posts to our side of the large 100x100 posts and slot fence panels in place.

Use 4m+ lengths of 100x100mm posts and concrete them into the ground next to the garage base, then secure to the garage base with bolts, and then attach fence posts and panels as before.

Use 3m concrete fence posts and have 1.8m 'above ground', and 1.2m attached to the garage base - but not sure how we would attach the concrete posts? Some sort of bracket perhaps? Drilling for bolts would surely cause weakness in the post?

Our main concern is that it can get very windy as we are at the top of a small hill, and we are concerned that wooden fence posts will just snap under wind pressure once the fence panels are in place. We will use hit and miss/venetian/woven panels to minimise the wind resistance, but there will still be some force on the posts. I suppose we could slide the panels out temporarily if the wind was gale force (as in the past week).

Any suggestions very gratefully received!

Thanks

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View media item 73495
 
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Put a balustrade around the edge of your deck (fixed to the deck) and rehang the bamboo panels suitably to flex in the wind...pinenot :)
 
concrete them into the ground. unless your wall is a 9 inch wall or thicker the fence will easily pull it over if you just bolt the fence to it.
 

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