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 Post subject: My New Deck - Frost Line
PostPosted: Fri Aug 10, 2018 11:43 am 
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Hi all,

I'm new to this website . My name is Lee, I'm 30 and I'm an avid DIYer with roughly 12 experience of lots of different trades etc.

I'm currently in the middle of converting my cellar into a summer type room with downstairs toilet, utility area, mini kitchen etc.
Out of the back of the cellar is the garden. Not much of a garden but hopefully thats about to change. I've just applied for planning permission for a 2 tiered decking area. Theres not much else I can do as the garden is on a downwards slope of over 20°. It drops 2.5m over a 6.5m length. There is little to no soil towards the end of the garden. The previous owners removed this and opted for a rockery area with steps up to the house. There is a concreted area nearest back door which I assume has roughly 2.5m of earth below, but I could be wrong.

My question is about how far to sink my deck posts along the slope. At the end of the garden they will go down by 700mm. As I get further up the slope do they need to be at the same level as the ones at the bottom or just 700mm below the level of earth at that point?

If they need to be the same level then the posts nearest the house would be 3.2m high, with the decking sat on top of those. Does that make sense?

Please see some images attached.



2 Pear Street Decking Side.jpg
2 Pear Street Decking Side.jpg [ 33.65 KiB | Viewed 537 times ]
2 Pear Street Decking.jpg
2 Pear Street Decking.jpg [ 119.29 KiB | Viewed 537 times ]
2 Pear Street Rear.jpg
2 Pear Street Rear.jpg [ 89.7 KiB | Viewed 537 times ]
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PostPosted: Fri Aug 10, 2018 7:28 pm 
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Generally speaking roughly 1/4 of the post should be below ground, so a 2.4 metre post will have 600mm below and 1800mm above.

With your 3.2 metre height then you are looking at 1000 mm depth so a 4.2 metre post. Assuming you get planning permission I would also get structural engineer to check loadings.

EDIT to change from 100mm to 1000mm or 1 Metre. :hiding:

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PostPosted: Sat Aug 11, 2018 10:17 am 
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Would you put wood in the ground? Says I that I have to replace posts on the other fence now (which is not my fence) and they have been placed in metal feet and even so they are gonners :-(

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