Raised decking

[Deanobello]

Hi all,

I'm looking at building a 6mx7m raised deck in my garden, what size do the support post need to be?(100x100?) how deep do I dig the support holes if the deck is to be raised 1m? What should the centres of each post be?

 

[freddiemercurystwin]

Don't forget the planning permission.

 

[noseall]

If the deck is to be raised by 1m i would have doubts about 100mm square posts being sufficient but it will depend upon distance apart v's number of posts used.

I came across something similar recently whereby the four corners of the decking were supported by railway sleepers whilst intermediate supports were 150mm x 150mm.

 

[big-all]

if its more than 300mm above the highest point it covers it needs planning as fm twin says
http://www.planningportal.gov.uk/permission/house

also if extensions sheds and other additions covers more than 50% off the total garden you need planning

 

[Deanobello]

I am in the process of planning permission (thanks for the advice)

Its the depth of the posts and what centres to put them at i'm lost with, cant seem to find this info out.

please help

 

[noseall]

Set them at 3m centres and use 150mm x 150mm timber joists.

 

[theoldun]

Hi all,

I'm looking at building a 6mx7m raised deck in my garden, what size do the support post need to be?(100x100?) how deep do I dig the support holes if the deck is to be raised 1m? What should the centres of each post be?

100x100 posts will suffice, however depending on species of tree they have been cut from, country that they have come from, preservative treatment used, they could still rot inside 3 years.
Suggest bolt concrete fencing spur back of each post.
Will then last your lifetime out.
With spurs attached 600 to 750mm in ground will do you.
As nose said 3000 centres, 50x150 joists at 400 or 450 centres.
oldun

 

[Deanobello]

Thanks oldun, sorry for sounding thick here but what do you mean "Suggest bolt concrete fencing spur back of each post."?

 

[noseall]

Thanks oldun, sorry for sounding thick here but what do you mean "Suggest bolt concrete fencing spur back of each post."?

I think what Old codger was inferring was to concrete in a godfather type concrete post then bolt some timbers to these .

 

[Deanobello]

How deep do the holes need to be and how wide? Is the best way to do these using a power auger?