I am considering building a canopy between the house and garage. The canopy will be 1.3m wide x 9.2m long, and I will attach the new beams to the garage rafters at a 14-degree angle. This means notching out the outer panel in 10 different places where the garage rafters are today.
The new beams will be about 3m long, and the part extending from the garage wall will be 1.3m. The part that doesn't extend will be attached to the garage rafters with French screws at 3 places on each rafter. What dimension should the beams be to handle a cantilever of about 1.3m?
In practice, it is the snow loads that determine the dimensioning. If you consider normal conditions, c/c 1200 between the rafters and Kronoberg County, you can use the following dimensions: C24 45x170, C18 45x195, and C14 45x220. If the conditions regarding cardinal directions, etc., are favorable, C14 45x195 should also work. At the same time, you have created a situation where the risk of snow pockets is apparent if you interpret the facade drawings. 14 degrees is not much of a roof slope in such contexts. You need to have a plan for this.
In practice, it is the snow loads that determine the dimensioning. If you calculate with normal conditions, c/c 1200 between the roof trusses and Kronoberg County, you can use the following dimensions: C24 45x170, C18 45x195, and C14 45x220. If the conditions regarding cardinal directions etc. are favorable, C14 45x195 should also work. At the same time, you have created a situation where the risk for snow pockets is apparent, if one is to interpret the facade drawings. 14 degrees is not much of a roof pitch in such contexts. You must have a plan for this.
If I go up to C24 45x195, should the canopy withstand a little more? Alternatively, use steel beams? I'd preferably not shovel snow.
I should add that the canopy tilts towards the southwest and there is quite a lot of sun (on sunny days, that is ).
C24 45x195 is probably a good idea. It can handle significantly larger snow loads. Steel is not a universal solution. It can indeed handle equivalent loads at smaller dimensions but is more difficult to fasten. For really large spans, glulam is preferably used.
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