Extend 90x90 post

[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]

I think I'll go with that suggestion. How would you screw together 45x95 with 95x95 respectively 45x95 with the bearer? Through bolt with carriage bolt or regular slightly heavier wood screw, for example, 6x90?

Would you glue with this solution?

 

[justusandersson]

Carriage bolts I think are best. Glue stiffens it up but doesn't feel absolutely necessary here.

 

[Villa1949]

When I calculate the dimensions for the roof structure using Swedish timber, it says that it doesn't work with 4 pieces of 95x95 posts at the front edge of the roof which extends 3.5 meters from the facade and is 490 meters wide. The posts also help to support the floor construction.

The deck is built with buried pilings with a maximum distance of 170 cm between them. The innermost beam is attached to the house foundation.

The beams are 45x195 (marked red on the drawing). Then there are screw joists at 60 cc in 45x170.

Surely, the 4 pieces of 95x95 posts should be sufficient for the roof if it's attached to the facade? What dimensions for the rest of the roof structure would be appropriate? (Preferably construction timber if possible)

Snow zone 1.5. The roof type will be channel plastic approximately 20 mm.

See the drawing where the dashed area is the intended roof.

 

[justusandersson]

It is an unreasonable result. I'll see if I can calculate it a bit later today.

 

[Villa1949]

It is an unreasonable result. I'll see if I can calculate it a bit later today.

Thanks, I appreciate it! To clarify, the idea is that the roof is only attached to the house and then to a supporting beam/hammer beam on top of the four outer posts on the edge.

 

[TrädgårdsBjörnen]

To be honest, I would have replaced the posts. Take them one at a time and prop them up under the beams, so it won't be a huge job to replace them. I wouldn't think you'd lose much time or money by replacing them if you plan a bit beforehand...

 

[justusandersson]

A 95x95 room-high post of C 14 class can support a load of 25 kN (around 2500 kg) if it is unbraced. In your case, the maximum roof load is rather around 5 kN.

 

[Villa1949]

A room-sized 95x95 post of C 14 class can support a load of 25 kN (about 2500 kg) if it is unbraced. In your case, the maximum roof load is rather around 5 kN.

Ok, and if I add polycarbonate panels that should have about 120cm center-to-center between rafters, which rafters should I choose then? They will be about 350cm long.

 

[justusandersson]

The smallest glulam dimension you can use is 42x225. If you want a lower beam, you can choose 78x180.

 

[Villa1949]

The smallest glulam dimension you can use is 42x225. If you want a lower beam, you can choose 78x180.

Thank you so much for all the help. I guess I can get by with construction timber 45x170 both on the posts and on the house as a top plate/support beam?

 

[justusandersson]

That's enough.

 

[Villa1949]

That's enough.

Can I take less?

 

[justusandersson]

Then you have to calculate more accurately for that. The roof beams end up at slightly different distances from the front pillars.

 

[Villa1949]

The minimum glulam dimension you can use is 42x225. If you want a lower beam, you can choose 78x180.

Do I need to place the roof beams on top of the wall plate/support beam at the front of the roof, or can I attach them at the same height as the wall plate? How is such an attachment made without losing too much load-bearing capacity?

 

[justusandersson]

It requires proper fittings. You may need to have a blacksmith/mechanical workshop manufacture such.