I plan to cast footings with adjustable post/beam shoes in two rows, almost 2m apart (150x700mm footings). In these, I will place 45x190mm beams. On this, I will screw together the nailers according to the picture in 45x145mm (the picture shows incorrectly) and attach the inner part to my foundation wall. Should I go up to 45x170mm in the nailers?
I will then have 34x145mm decking on this.
I also wonder how I should think if I want to raise posts and have a roof over a part of it. Width 7500x4000mm. Do I need to cast extra footings there or would 2m between the footings work (if so, I was thinking of attaching the posts to the beams near the footings)? What dimensions do I need for the top beam and roof rafters considering snow loads? I was thinking of having a 6-degree slope on the roof and I live in the Stockholm area.
Grateful for all help with thoughts and calculations.
Note: Placing the deck on slabs is not an option in this case.
The timber dimensioning seems reasonable based on my experience. You have solid beam supports and sensible spacing between the plinths. The dimensions of the nailing strips feel standard, should work.
How you should anchor the posts upwards, there are various ideas about this, and I believe it will become clear over time. In some deck constructions, I've installed the posts on plinths below; in other cases, I haven't. It can be quite stable regardless.
The only thing I wonder about is why you plan to screw into the foundation/facade. I've never done this and don't see the point either. Please explain more.
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PS. 600 cc between screws/nailing strips is usually considered standard, you have a slightly longer distance. It might work with thicker than standard deck boards 120 x 28, but personally, I wouldn't compromise on 600 mm cc. It needs to be 100% stable.
The wood dimensioning seems sensible based on my experience. You have solid beams and a reasonable distance between the ground supports. The dimensions of the nail battens feel standard, should work.
How you should anchor the posts upward, there are several different ideas about this and I think it will become clear over time. In some deck constructions, I've run the posts on ground supports underneath, in other cases, I haven't. It can be really stable either way.
The only thing I'm wondering about is why you want to bolt into the foundation/facade. I've never done this and don't see the point either. Please explain more.
Hi, thanks for your response,
The reason I want to attach to the foundation wall is because I just finished waterproofing my house and don't want to risk a major settlement along the inside. The first row of ground supports is in fairly undisturbed soil, and I don't expect it to settle significantly.
I'm planning to cast footings with adjustable post/beam supports in two rows with almost 2m in between (150x700mm footings). In these, I will then lay 45x190mm beams. On this, I will screw together the joists according to the picture in 45x145mm (the picture shows incorrectly) and attach the inner part to my foundation wall. Should I go up to 45x170mm in the joists?
I will then have 34x145mm decking on this.
I am also wondering how I should think if I want to put up posts and have a roof over a part. Width 7500x4000mm. Do I need to add extra footings there, or is 2m between the footings okay (I was thinking of attaching the posts to the beam near the footings if so)? What dimensions do I need for the top beam and roof joists considering snow loads? I plan to have a 6-degree slope on the roof and live in the Stockholm area.
[image]
Grateful for all help with thoughts and calculations.
Note. Placing the deck on slabs is not an option in this case.
In terms of structural stability, 45x145 C24 (note the construction timber) is fine. I would also set c/c 600 for safety's sake and potential practical reasons. The deflection and vibrations are hard to estimate theoretically, even though it doesn't seem like it would be an issue considering you don't have large spans, you have reasonable dimensions, and hopefully a good attachment to the foundation wall.
In terms of structural strength, it's fine with 45x145 C24 (note the construction timber). I would also set c/c 600 for safety and possibly practical reasons. The deflection and vibrations are difficult to estimate theoretically, although it doesn't seem to be an issue considering that you don't have such large spans, you have reasonable dimensions, and hopefully a good attachment to the foundation wall.
spoke with the building supply store today who said that 34x145 decking can handle 800cc. Can you trust that?
talked to the building supply store today who said that 34x145 decking can handle 800cc. Can you trust that?
It can definitely handle 80cc. I built it for myself this past summer but opted for 70cc. I absolutely don't feel more flex with 70cc than I do with the other deck where there's 28/120 on 60cc.
Otherwise, your construction looks stable. I would probably figure out the solution for the roof after framing everything.
It can handle 80cc guaranteed. I built one for myself last summer but chose 70 cc. I absolutely don't feel more bounce with 70 cc than I do with other decks where there's 28/120 on 60 cc.
Otherwise, your construction looks stable. I would probably figure out the roof solution once everything is framed.
Is there going to be no railing or steps?
Great, then I can be at ease regarding the bounce which was my concern.
Yes, there will later be a step down to a lower level along the entire long side, but that part will be built in conjunction with the pool construction. On the left short side, there will be a slatted fence that extends a bit onto the long side for privacy. I was thinking of attaching these posts to both the support beam and the screws, which should be stable enough?
Looks great. Really stable and stylish. I'm most impressed by your neat drawing. What program is that? Is it hard to learn the program?
It takes a bit of tinkering before you get the hang of it, but once you get over the initial hurdle, it becomes fun to model in SketchUp. There's a web-based free version. You can get as detailed as you like, here are bolts for the screw rule against the basement wall.
But what I'm struggling with now is the sizing of the roofed part, which might be enclosed in glass later. On Swedish wood, it says that everything, including the entire deck, must be built in laminated wood... that doesn't make much sense to me.
In the picture, there are 95x95 posts with a 45x195 as the top beam. I was then thinking of having 45x170 at c/c1200 to lay the plastic rack on. Maybe I need to go up to 190mm on the top beam?
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Thiger said:
Krille-72 said:
