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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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How much of posts in ground for pergola
Hello all,
Haven't posted here or even lurked for more than a year, and my news server is showing over 300,000 unread messages! Good to see a few familiar names though. Anyway, I am building a pergola using the designs on http://www.pavingexpert.com/featur07.htm I noticed that the posts are approximately 2.8m long, but only about 0.5m is in the ground. For fence posts I have always been told that a quarter of the post should be in the ground, and this is less than a fifth. Do you think this is because there isn't as much lateral force on a pergola (due to wind) so it does not need as much to stop the post moving as with a fence? I guess with all the braces the pergola could be pretty much free-standing, so the main thing is to keep it in the same position in the ground. Also, would it matter if the holes were tapered slightly so they get narrower at the bottom? Also, I will probably use a post fix concrete like Hanson PostFix or Blue Circle Postcrete because I have too much money and not enough experience of mixing mortars. Do you have any views on whether either of these is a superior product? Sorry for all the questions! Thanks in advance for any help you can offer. Al Reynolds |
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