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I have aluminum fencing post of 7 ft. Because of less height, I cant use this to insert directly into the concrete to have additional stability and strength. One option is directly installed on a concrete base with screws but that doesn't seems to be strong as sometimes we get wind of 60-70 km/h plus I am in snowy region so frost lines is another thing to worry about.

One another option I am thinking about is using an additional 2-3 ft extra aluminium similar post and adding it on top of 7 ft of aluminum post to make it as 10FT post total and inserting 3 ft directly into concrete to have additional strength.

How should I attach two post together strongly so that it can withstand wind and lateral pressure.

This is the post- https://www.rona.ca/en/product/everhome-6-ft-surface-mount-post-for-composite-fence-lwpst0001-332005780?viewStore=82413&cq_src=google_ads&cq_cmp=19750304322&cq_con=&cq_term=&cq_med=pla&cq_plac=&cq_net=x&cq_pos=&cq_plt=gp&&cm_mmc=paid_search-_-google-_-aw_pmax_generic_Online+Exclusive-_-&gad_source=1&gclid=CjwKCAjw9IayBhBJEiwAVuc3fvY8tF6x-XSyuTAAwyy-LmUpiSRfl4azLEjfJ41OtBuTmMLLUtqRbhoCejAQAvD_BwE&gclsrc=aw.ds

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    Aluminum posts in concrete are a corrosion disaster that does not wait long to happen. See: diy.stackexchange.com/a/193661/18078 among others.
    – Ecnerwal
    Commented May 13 at 15:44
  • Thats intersting..didnt know Aluminium and Concerete doesnt go well..I see lot of installation like that where they just insert post all the way inside the concrete
    – Bret
    Commented May 13 at 15:54
  • Looking at the manufacturer's installation instructions and they have no problem recommending concrete for in-ground installation
    – DJ.
    Commented May 13 at 21:09

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Those posts are only 6ft long and are designed to be surface mounted to concrete footings. You need to buy the 8ft version which is designed to be in-ground inserted into concrete as per the manufacturer's directions. They say to bury it 30 inches so you will have a fence height of 5 1/2 feet.

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  • I have purchased already 7 ft in height post. The link was just to show what kind of post I am talking about...If I put directly into the concrete for 2.5 ft, I just get only 4.5 ft of fence which is not enough, that's why I am thinking about attaching two posts together(not sure the way hence the question), 7 ft original post + 3 ft addition to it and insert 3 ft all the way to the concrete....so that I can get 7 ft of fence height....Problem is I am not sure how to attach two aluminum post together.
    – Bret
    Commented May 14 at 13:54

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