I have a plan to build a pergola on a part of the deck as the decking is being replaced this spring.
The idea is for it to look something like this:
So, I thought I'd attach one side to the facade or outside the gable roof overhang. Is there anything special I should consider when doing this?
Here's a bad picture showing the gable roof and the space where the pergola will be attached.
I'm also considering whether I can skip the post that ends up in the middle of the deck by having a longer crossbeam. But this might just make it more complicated and require larger dimensions of lumber?
I have a plan to build a pergola on part of the deck as the deck is being replaced this spring.
The idea is for it to look something like this:
[image][image]
So I thought of attaching one side to the facade or outside the overhang of the hipped roof. Is there anything specific I should consider when doing this?
Here is a bad picture showing the hipped roof and the area where the pergola is to be attached.
[image]
I'm also considering whether I can skip the post that ends up in the middle of the deck by having a longer beam. But this might just make it more complicated and require larger dimensions for the lumber?
[image]
One thing to consider is what's behind the cover boards at your eaves. Ideally, you want to attach the construction to a beam.
Since it is a pergola and not a roof, I think you can get away with relatively small dimensions structurally, even if you skip the middle post. It looks to be about 3m between the facade and the edge, so a 145 - 195 x 45 should go a long way, perhaps even 120x45, especially if a few mm of deflection is not an issue.
What you need to consider is what is behind the cover boards at your eaves. Ideally, you want to attach the structure to a joist.
Since it is a pergola, and not a roof, I believe you can get away with fairly light dimensions structurally, even if you skip the center post. It looks to be about 3m between the facade and the outer edge, so a 145 - 195 x 45 should be sufficient, maybe even 120x45, especially if a few mm of deflection is not an issue.
In another thread, there is some discussion about aesthetics and what time can do regarding twisting and turning ordinary lumber, which might be worth reading:
[link]
The rafters go all the way out to the cover boards, I’ve replaced them so I know what it looks like behind them. But I can't decide whether to attach on the outside of the cover boards or let the pergola's beams go under the roof overhang against the wall. The height is about 240cm from the deck to the underside of the overhang.
However, the width of the deck is longer, nearly 5m:
5 m is too long for the span; the rule will sag significantly. So, one more post will be needed. It doesn't need to be placed in the middle but can be positioned where it works well, approximately 1.5-1m out from one side at the minimum.
5 m is too long for the support length; the beam will hang down considerably. So an additional post is needed. It doesn't have to be placed in the middle but can be placed where it fits well, about 1.5-1m out from one side at the minimum.
If you read again, you'll see that the deck is 5 meters and in the picture, the pergola is about half the width, so I don't think it's a problem...
5 m is too long of a span; the rule will sag considerably.
Does it matter for the function? It will probably shade just as well, and you can’t put a roof on the pergola, so you don't need to account for snow load.
Does it affect the function? It probably shades just as well anyway and you can't put any roof on the pergola, so you don't have to consider any snow load.
There will be quite a bit of deflection; it's not just its own weight, but also the load from the joists it's attached to. So, if you can accept it bending down 10-15 cm in the middle after a year or so, you can go ahead.
There will be quite a bit of deflection, it's not just the weight of the beam itself but also the loads from the attached joists. So if you can accept it bending down 10-15 cm in the middle after a year or so, then go ahead.
Pressure-treated tvåtumfyra weighs about 2kg per meter, so it could be around a maximum of a hundred kilograms on that 5-meter beam?
A 45x95 at 5 m will sag even more, I'm thinking 145 or larger if you look at the proportions in the picture.
Yes, a 45x95 would probably break at a five meter span... Here you can test some different spans https://www.byggbeskrivningar.se/dimensionering/pergola/ 5 meter span is a lot. It probably requires a fairly strong glulam beam for that.
I would have placed another pillar and skipped the extension. It becomes more difficult and expensive.
Dimension and build so that a plastic roof can be placed on the pergola.
It actually rains here in Sweden, and after having to bring in cushions and other items, you'll wish there was a roof.
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Marcus0321 said:
