Deck Specs

[Dalob]

OK, I am finally about the start stage 2 of my deck. Pool is in (for at least 8 months) and now I need to extend my existing verandah up to my above ground pool.
Deck Specs are:
Basic deck size: 6.2m x 9m
Joists: 190x70 treated pine sleepers
Bearers: 190x70 treated pine sleepers
Joist spacing: 450mm
Bearers at 1800mm
Decking Mat'l: Spotted gum or tallow-wood, will depend on availablity and $

Going with brick piers also spaced at 1800mm as I intend to place a spa on this deck (somewhere), as well as extending a room of my house out on to this deck at a later stage.
Extension to have colourbond roofing, and approx. 4m x 7m in size
Spa weight filled, including people: approx 2700kg.
(equates to approx. 490kg/sqm)

Would anyone be able to provide some feedback regarding these basic specs, are they overkill, are they too small or would they be suitable.
I think I may have to relook at the spa position due to the loadings but any input would be approeciated.

I have considered using treated pine posts for some of the piers but by the time I place the room extension and spa on this deck, there does not seem to be many piers left over, so I decided to use brick all the way.

Any constructive input appreciated.

[Pulse]

Hi Dalob, welcome to the forum,

A few things that may help.

1. Any reasonable deck like this needs council approval with data from a framing manual such as AS 1684 Timber framing manual.

2. brick piers are no better than steel or timber posts, just more difficlut to put in.

3. timber sleepers are non structural and cannot be used in decks.

To give you an idea 190x45 f7 pine joists will span about 3500mm at 450 spacing. Treated pine will generally be the cheapest to build from. Under the spa you could just add an extra length of bearer with two posts, which halves the joist span. A normal deck over 1m high is built for a load of 2kPa or about 200kg/m2.

Tradac did publish some good span tables... look on google

Good luck Pulse