Hello.
Starting my membership with asking for help!
I've been thinking about building a raised deck, with a height of about 2.5m. The idea is that it should support like a "regular" deck.
The problem is that I don't want too many posts since it's a sloping site, and this creates quite long spans between pillars=enormous lumber=heavy etc. I'm actually leaning towards building the structure with an IPE beam.
Attached is a (very) simple sketch.
How would you have done/not done it? Maybe it's completely impossible without needing to use enormous dimensions?
Grateful for all responses!
I won't answer your actual question now, but I'm curious if, in other words, you're planning to build a balcony? With that height, you'll need a building permit and probably both construction drawings and a KA.
If you see it as a deck, you need three approximately 9-meter-long beams, preferably in glulam with 3-meter c/c distance, and crosswise floor joists with 600 mm c/c. If you live in snow zone 2, the beams could be 90x315 mm and the floor joists 45x220 mm. It might be a balcony, in which case you should account for slightly larger loads primarily affecting the dimensions of the beams. The best option is to place the deck on glulam pillars resting on low footings. If the construction is to be freestanding from the house, some pillars need to be stabilized with diagonals as well as the deck itself in the horizontal plane. If you prefer to use steel for the beams, an IPE 180 is sufficient. Besides the fact that steel will be about twice as expensive as glulam, you will have a maintenance problem on your hands. I would not choose steel.
Hello and thank you for the response.
How do I know if it is classified as a balcony or a terrace at height?
Regarding the beams, won't the distance be around 4-4.5 m? Or are you thinking of moving these pillars towards the center and having a bit of overhang?
Hi and thanks for the response.
How do I know if it's classified as a balcony or a terrace at height?
Regarding the beams, won't the distance be around 4-4.5 m? Or are you thinking of moving these pillars toward the middle and having a little overhang?
You can read about it on your municipality's website.
Here's what my municipality says about the definition: Aterrace that is completely placed at ground level or is under 1.6 meters does not require a building permit.
However, a terrace requires a building permit if it is considered an extension, that is, if it increases the building's volume or means that the space under the terrace can be used, for example, as storage. It is primarily size, height, and design that determine whether a terrace is an extension or not. There are no exact measurements for when a terrace becomes an extension, neither in terms of size nor height.
I would suggest discussing it with your municipality. I would say your building's volume changes and that a building permit is then required.
Under the Planning and Building Act, it cannot be said with certainty whether your patio requires a building permit or is exempt from such a permit. You must check this with the municipality. I believe that the height conditions of the plot are quite decisive, as well as whether the property is within a detailed planning area or not.
I choose to place the support beams parallel to the house so that the floor joists have a span of approximately 3 meters. This provides better material utilization. It doesn't matter if the support beams protrude a little from the posts.
With the support of the Planning and Building Act, you cannot certainly say that your deck requires a building permit or that it is exempt. You need to check this with the municipality. I think the height conditions on the plot are quite decisive, as well as whether the property is located within a detailed development plan area or not.
I choose to lay the support beams parallel to the house so that the floor joists have a span of about 3 m. This offers better material utilization. It doesn't matter if the support beams stick out a bit from the posts.
But if I have a span of 4.5 m, what dimension do I need then?
I don't quite understand how you achieve 3m. Since the deck will be about 9x7m.
Regarding balcony or deck, I'll need to check with my municipality.
If the floor beams are to be in regular construction wood, they must have a significantly shorter span than 4.5 meters. Otherwise, they also need to be in glulam, which would make everything about three times more expensive. I have sketched the construction principles on your drawing. The location of some plinths may need to be adjusted.
If the floor joists are to be in regular construction timber, they must have a significantly shorter span than 4.5 meters. Otherwise, these must also be in glulam, and then everything becomes about three times more expensive. I have drawn the principles for the construction on your drawing. Some post locations may need to be adjusted. [image]
That was exactly the concern. If I have a shorter span, I "kill" the entire area underneath, because it is on the sloping part and the backside, resulting in a bit too much loss compared to what I gain. What dimensions are required for 4.5m? Where can I find out about that?
For a 4.5-meter span, glulam is required. The minimum conceivable dimension is 42x315 mm. You can indeed increase the c/c distance between these to 700 mm if you use decking timber with dimensions of 34x145 mm. Other variations can also be considered. You can choose more robust glulam beams with a larger c/c and then inset thinner timber between these with joist hangers. I am not aware of any good tools for dimensioning when you need to think outside the box. Here at Byggahus, you can get help as long as you know what your priorities are.
For a span of 4.5 meters, glulam is required. The smallest possible dimension is 42x315 mm. In that case, you can indeed increase the c/c distance between these to 700 mm if you use decking timber with a dimension of 34x145 mm. Other variations can also be considered. You can choose stronger glulam beams with larger c/c and then inset lighter timber between these using joist hangers. I'm not aware of any good tools for dimensioning when you need to think outside the box. Here at Byggahus, you can get help as long as you know your priorities.
Thank you for taking the time to reply! This "deck" project has been on hold for a while, but I plan to resume it now during parental leave. Could I get in touch with you for a "proper" structural calculation and also a drawing? Of course, for a fee.
Unfortunately, I can't help with that. I don't have time for it. However, you can get good advice for free here on the forum. Drawings, on the other hand, require much more time. Furthermore, one should be able to check the conditions on-site. But I am flattered by the offer.
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