Hi, I need help with the construction of a deck. I'm working on a deck with the dimensions 3600x5750m.
It's supported by 9 pillars distributed across 3 rows. The two front rows are buried in the ground, whereas the back row is special because there is a retaining wall to the house underneath.
The deck is not anchored to the house because I want them to be able to move independently of each other in case they shift.
On the pillars lie bearers 195x45 and floor joists on top of that 145x45. I have also placed extra "support legs" that rest on concrete slabs on the ground.
The problem I've encountered is that the construction "sways" if I force that movement. Not sideways, where it is rigid, but forward/backward it moves. I want it to be completely rigid, so now I need help with how I can "lock" the construction so it doesn't "sway."
I'm considering whether I can place joists on the outside or underside of the bearers to lock them together, if that would make it rigid? I think if I place them on the outside, I'll fasten them with 90-degree angle brackets which in turn "lock," or alternatively screw them to the underside of the bearers?
Or should/must I do something different to eliminate the "sway"? When I just walk on the floor it's stable, but you want it to be completely rigid always.
My thought is to put a skirt around it so I assume that in itself will stabilize it a bit. But I would like to hear opinions if anyone knows this better
Start by placing cross braces, suggested at 45x70, between the outer support post in rows 2 and 3. (The two load-bearing beams furthest from the house, with wooden posts between the beam and pillar.)
If you find it stable enough, you can stop there. It's probably still a good idea to do it in the middle too.
Even if it's stable sideways, it doesn't hurt to do something similar there. It should work to place diagonal braces from the lower part of the posts* up to the beam at approximately a 45-degree angle. Again, the two outermost beams/pillar rows from the house.
* Those attached to the anchor bolts.
Start by installing diagonal braces, preferably 45x70, between the outer pillar posts in rows 2 and 3. (The two beams farthest from the house, with wooden posts between the beam and the pillar.)
If you feel that it becomes sufficiently stable, you can stop there. It's probably a good idea to do it in the middle as well.
Even if it is stable laterally, it doesn't hurt to do something similar there. It should work to install braces from the lower part of the posts* up to the beam at about a 45-degree angle. Again, focus on the two outermost beams/pillar rows from the house.
* Those that are attached to the concrete pillar anchors.
Since diagonal braces are new to me, can I place a board on each side of the post, or does the "cross" need to be on the same side of the post, if you understand what I mean?
One more question. Since the post rows are not completely straight, should I build up the post so the rule comes straight, or is it just as good if they sit a little "crooked" if you know what I mean?
I assume you mean between the rows of blocks? It looks like the blocks might not be perfectly aligned.
In any case, it's fine to let them go a bit askew. It can't involve major misalignments.
When the braces go a bit askew in that direction (as well), it means that the force will have a small component that moves sideways. If the braces are also placed sideways, they will absorb the forces.
Assuming you mean between the pillar rows? Looks like the pillars may not be completely aligned?
Either way, it's fine to let them go a bit askew. It can't be such big distortions.
When the braces go a little askew in that direction (too), it means that the force will have a small component going sideways. If braces are also placed sideways, they will absorb the forces.
It wasn't as big a difference as I thought when I looked closer, so I went ahead. Wow, what a difference it made in stability. However, I've only put cross braces on the outer ones as you suggested. It moves a little, but now it's a "natural" movement I expected since I haven't anchored it to the house. But I’ll brace a few more and it should be completely stable. THANK YOU SO MUCH!!
There should also be enough with two diagonal braces in a V from the front outer posts that meet at the middle post in the back row. Screw-glued horizontal 45x95 against the bottom edge of the bearing beams.
Like this:
In the picture, only one diagonal brace was attached. All other "stuff" in the picture on the posts is just temporary during the construction and was removed when the decking was laid.
It should also be sufficient with two diagonal braces in a V from the front outer posts that meet at the center post in the rear row.
Screw-glued horizontal 45x95 against the underside of the beams.
Like this:
[image]
In the picture, only one diagonal brace was attached.
Everything else "junk" in the picture attached to the posts was temporary during construction and was removed when the decking was laid.
/Göran
Thanks! Will check this out.
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