Child Item

How to build a Mailbox base?

I am planning to make a concrete base on top of a soil which is 600mm x 350mm x 100mm deep. Beside the area is a concrete pathway and concrete driveway.

I have dug a whole as specified by the instructions asked.

Is it safe to drill on the concrete and attach a rebar?

Find more posts tagged with

Tools and Materials

Building and Construction

Comments

EricL

Hello @cgab

Thanks for sharing your question about your letterbox. If you are drilling from the side, my best advice is to make sure that you are not too close to the surface, otherwise the concrete surface will crack. This is on the condition that your concrete path/driveway is at least 100mm thick. If attaching the Rio bar to the existing concrete path/driveway is included in the instructions, then it is something you'll need to do.

If you need further assistance, please let us know.

Eric

cgab

https://www.workshop.bunnings.com.au/discussion/comment/53792#Comment_53792

Hi Eric. Thank you for the information.

With the instructions, it just stated to dig a hole and pour concrete directly. No Rio bar whatsoever.

i just thought of putting a rio bar just to make sure it would be strong enough for wind gust.

EricL

https://www.workshop.bunnings.com.au/discussion/comment/89122#Comment_89122

Hello @cgab

My only other suggestion is to make sure that the Reo bar is totally covered by concrete and is not touching the soil.

If you need further assistance, please let us know.

Eric

AlanM52

https://www.workshop.bunnings.com.au/discussion/comment/89122#Comment_89122

Hi @cgab,

So you are you concerned (and want to mitigate the possibility) that the whole thing - mailbox and slab - could topple over in high gusty winds yes?

Don't bother with the.Rio.

Google image search reports that is a Milkcan Noosa and the mailbox is secured to the slab with expansion bolt.

For peace of mind you can do the same to secure the slab to mother earth with threaded rods.

When preparing the trench for concrete boar two auger holes using something like this.

Garden Auger Bit.jpeg

Cut this in half.

Zinc Plated Whitworth Threaded Rod.jpeg

Also need nuts for that.

Wind the nuts on flush with the rod ends.

Hammer the rods into the auger holes so they will be about flush with the concrete slab.

Do the concrete thing making sure to poke/prod the concrete to compact and eliminate voids, in particular the auger holes.

If needed tap the rods below the surface of the concrete when trowling.

Cheers

Child Item