I am going to tear down this carport and make a wider one, but I know that it won't work in a dimension program as I planned, so I thought I'd ask here if anyone can give advice. The one in the picture is about 3m wide and has roof beams of 125x50 and cc600mm, and they have held up despite a lot of snow on the roof. I usually shovel when it's over 70cm, and it's probably not supposed to hold according to dimension programs, but it's worked fine.
Now I'm considering making it about 5m wide and using 195x45 and cc600, but they are quite heavy, so will they warp just from their own weight, or will it work? I understand that I might have to shovel already at 50cm of snow then.
There you enter your carport and specify the location for the carport. That will give you the snow zone, then you specify the roofing material, etc., and you'll get dimensioning suggestions. You can then test with different measurements for the carport, including roof overhang, and see how it affects the dimensioning of the roof beams.
Start with the Swedish Wood's dimensioning page
[link]
There you enter your carport and indicate the location where you will have the carport. Then you will get the snow zone, after which you specify the roofing, etc., and then you will get suggestions for dimensioning. You can then test with different measurements of the carport, including roof overhang, and see how it affects the dimensioning of the roof beams.
I have tested there and it doesn't work because in theory nothing holds with the measurements I have specified, so I want to know more about how it works in practice if they bend under their own weight.
Is the measurement B 3 or 5 meters? I think your drawing shows one thing and the text another.
I have undershot these recommendations that Svenskt Trä recommends on some sheds (due to a combination of stinginess and ignorance). Despite that, they've held up well for 15 years, with only 1 snow shoveling. But that's anecdotal evidence. And we've had mild winters and are barely in snow zone 2. So generally, it's good to follow the recommendations, if you get some rot in the beams, having some margin is good too.
If you don’t provide many more details such as roofing, lengths, roof pitch, snow zone, etc., no one can calculate the deflection of your proposed beam 195x45 either.
All the studs visible here are 125x50 except for the roofing nailers which vary slightly in width but are about 35mm thick, and the posts are about 100x100mm. In all calculation programs this wouldn't hold in any snow zone, but it has held in Västerbotten and occasionally up to 80-90 cm of snow, otherwise I usually shovel at about 60 cm. It is currently about 3m wide but I plan to make it 4.5-5 m now with stronger studs, but according to dimensioning programs it doesn't even work in Skåne, but I think it should work if you keep track of the snow depth on the roof. How much pressure can a 5m long 195x45 hold in the middle, if anyone knows?
All the studs shown here are 125x50 except the roof battens which vary a bit in width but are about 35mm thick and the posts are about 100x100mm. In all calculation programs, this wouldn't hold in any snow zone, but it has held in Västerbotten and occasionally up to 80-90 cm of snow; otherwise, I usually shovel at about 60cm. It is now about 3m wide, but I plan to make it 4.5-5 m now with stronger studs; however, according to dimension programs, it doesn't even work in Skåne, but I think it should work if you keep an eye on the snow depth on the roof. How much pressure does a 5m long 195x45 hold in the middle if anyone knows?[image]
There is a reason the dimensioning programs indicate that it won't hold.
I have a 195*45 on a 4 m pergola in Umeå myself and would never consider putting a roof on such slender dimensions. Isn't it better to buy roof trusses?
There is a reason why the design programs indicate that it will not hold.
I have a 195*45 on a 4 m pergola in Umeå myself and would never think of putting a roof on such fragile dimensions. Isn't it better to buy trusses?
/Krille
This has held up and 195 should be sturdier I think even if the length is more... it's cc 600 here and I plan to continue with that. I've tried googling but can't find how much pressure different beams can handle.
This has held and 195 will be sturdier I think even if the length is more... it's about 600 cc here and I plan to continue with that. I've tried googling but can't find how much pressure different studs can handle
The design programs are based on what the studs can precisely handle in a specific construction in a specific snow zone and have been developed by experts in the field. You probably won't get a better answer than that unless you hire a structural engineer.
Are you really saving that much with such slender studs on 60 cc compared to properly dimensioned glulam beams on 120 cc?
I will rephrase the question then because I know that a dimension program says it won't hold, but it doesn't matter to me in this case, so I'll change the question to which dimension hangs down more under its own weight at the same length, for example between a 145 and 195 that are 4m, is it 145 because of the smaller measurements but at the same time it becomes lighter?
With the given conditions in the first post, the tension will increase by about 130%. Reasonably, you should follow the standard, but it is up to you to ensure the snow load does not become too great if you choose to deviate from it.
I think you should try to follow the recommendations, there might come a day when you're sick for a longer period and can't shovel the roof. Or when the "snösmockan" comes when they're away.
I think you should try to follow the recommendations; a day may come when you're sick for an extended period and can't shovel the roof. Or the "snowstorm" might hit while they're away.
I agree. If TS is in the hospital or away and can't shovel away the snow, then the snowmobile/car/wife/child/grandchild/postman might get crushed under the carport. It's a bit like asking which lamp cord is best to connect a 9kW sauna heater with.
Build according to the standards is my advice.
I have a pretty good understanding of what holds up without always building according to building codes, and the question is which dimension hangs down more due to its own weight if anyone knows that?
It is difficult to really understand what is actually being requested. The table shows the deflection for different dimensions in relation to your joists and span that you have today.
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