Choice of joists for decking...

[Statteman]

Hello everyone,
The concrete steps to the house are now gone and will be replaced by a wooden deck, which will be a maximum of 1.5m wide and 8m long. It will have a 170 bearer fastened to the foundation and will be attached to 4 piers. Now to the question: I have read that 45x95 should handle a span of 1.5m, is this correct? Can I manage with that without it becoming too wobbly? It will have 28x120 decking on top of that.
Best regards,
Kalle

 

[GoForIt]

Go up a dimension if you can, and you'll get a more stable solution.

 

[Jan-Å]

I have 220 in the main beam and 195 as joists in the part that stands on piers, it doesn't sway at all
I have a relative who skimped on both the main beam and the joists, it's reminiscent of walking in a canoe to walk on that deck.
Max 2000 between the piers says "my" carpenter, 45x95 on a 1500 span I think will be wobblier than you'd want but I haven't tried.

 

[Statteman]

Maybe I should go up to 120, more than that shouldn't be necessary? I don't have room for more ...

 

[slacker]

I have 120x45 with a span of 1.5m with beams of 195x45 and it handled the crayfish party with 30 people without any problems! 28mm decking.
Used so-called Class A pressure treated if that makes any difference!?

 

[MB77]

Used so-called Class A pressure-treated if that makes any difference!?

No, it makes no difference. A is the classification of the impregnation and can be used directly against soil or water. Usually, AB is used above ground.

 

[slacker]

No, it makes no difference. A is the classification of the impregnation and can be used directly against soil or water. Normally, you use AB above ground.

Then I'll take it that it at least withstands moisture a bit better!

 

[GoForIt]

Maybe one should go up to 120, more than that shouldn't be necessary? I don't have room for more ....

Put the beams in joist hangers and you'll lower the construction height.

 

[Statteman]

Yes, it will probably be 120x45 to be on the safe side..

 

[Statteman]

I had a small question regarding my construction, I will have 170 bearer in the plinths, is it possible to go down a dimension on the bearer that is nailed into the foundation??
Kind regards,

 

[GoForIt]

Yes, with the right attachments you can go down there.

 

[Statteman]

Sounds good, and the correct fastening can be counted as 2 nail plugs with 60 in between???

 

[GoForIt]

French screw

 

[Statteman]

The measurements have now changed slightly and it will only be 100 wide, so the beams will only be 90 long, can I then go for 90x45?? I have 2.30 between the posts, should I go up to 195 then or is 170 enough when it's that narrow???
Regards

 

[Nimajneb]

If you look in the right forum section, you will find lots of tips as well as sizing tables etc. etc. etc.
http://www.byggahus.se/forum/altan-uteplats/