DIY Doctor

6ft garden boundary wall

Postby Stuart_253 » Mon Jun 18, 2007 6:17 pm

I want to build a single width garden wall with pillars 15 mtr long x 2 mtr high using standard concrete blocks 440 x 220 x 100. Using the foundation calculator I came to a staggering 82 Kn load (this includes 30Kn wind load based on 1 Kn per Sq Mtr). The soil is compact and will require the use of a pick axe. After all this I'm still struggling to decide depth and width of my strip foundation. Could you please advise.

One final thing, again using a calculator I came up with a total requirement of concrete to create a foundation as follows based on a .5mtr depth x .5mtr width & 14mtr length.

Cement = 1.2 tonne
Sand = 2.2 tonne
Gravel = 4.5 tonne

Is this about right.

Apologies for asking so much but just want to make sure everything is in place before i commence. If you can help with this your definately on my Christmas card list. Thank you.
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Simply Build It

Postby thedoctor » Thu Jun 21, 2007 8:00 am

Your foundation only needs to be 150mm deep Stuart, not 500mm and for a 100mm wall the width only needs to be 400mm. The ideal mix is 6 to 1 which, as the calculator shows on your previous entries, is about right. All of the above only applies if the bottom of the trench is solid ground.
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