Extend 90x90 post

[Villa1949]

is there a correct way to extend a standing 90x90 impregnated post without losing too much load-bearing capacity?

The posts should go up and support a deck roof at the front. I would prefer not to use visible metal if I don't have to, as the posts will be visible.

I'm asking because I've changed my mind and am now considering building the deck roof (plastic) 20-40cm higher than I previously planned so that it doesn't feel enclosed from inside the house since the deck floor is a bit lower than the floor inside the house.

 

[justusandersson]

Difficult to make it neat and "invisible". It will probably require the same amount of cost and work as replacing the posts.

 

[Villa1949]

Difficult to make it neat and "invisible". It will probably involve the same costs and work as replacing the posts.

If you're not going to make it invisible, how do you do it then?

I could have handled the costs for the posts, but the posts go down to footings and the same posts support the deck floor. So it feels very cumbersome to replace the posts.

 

[Villa1949]

Would this have been a good solution? Then I would at least have raised it 17 cm. Original post in green

 

[justusandersson]

Of course, you can do that.

 

[Villa1949]

You can certainly do that.

Great. And you don't think it will be a weak construction? Then I have it as a good alternative.

Then my second suggestion is like this picture, the advantage of this option is that I can build on as much as I want. What do you think about that?

 

[justusandersson]

I believe more in option 1. You should draw to scale when making this type of sketches. Otherwise, you deceive yourself.

 

[justusandersson]

I have to admit that I misunderstood your sketches. 45x90 are standing studs then?

 

[Villa1949]

I must admit that I misunderstood your sketches. 45x90 are then upright studs?

Yes, exactly

 

[Villa1949]

Correction. The posts that are in place are probably 95x95 and the upright ones on the drawing are intended to be 45x95.

 

[justusandersson]

I think so too, but I avoid correcting when it's not necessary. The attached, to-scale, sketch shows how you can do it.

 

[Villa1949]

I think so too but I avoid correcting when it's not necessary. Attached, to scale, sketch shows how you can do it.
[image]

Thanks for the sketch. Exactly like my suggestion 1 but a much nicer drawing. Looks good.

 

[Villa1949]

Do you think I should glue as well? What type of glue is usually used in such cases? I appreciate your answers. Thanks.

 

[Mats-S]

Alternatively, I think it's stronger and kind of prettier;
Clad the posts with 95mm/145mm boards, make the joint inside the cladding which will never be seen.
Thicker posts are always nicer, you get that as a bonus with this solution ;-)

 

[justusandersson]

It is the invisible solution that I thought of. It becomes strong and stylish if you glue, but it involves some work and costs.