I am planning to build around our cement ring where we usually sit and grill. However, I'm not sure how to construct the wall that will support the shed roof beams. The wall will be uninsulated. I live in snow zone 3.
Right now, the design looks like this:
The first question is, what is the minimum dimension required for the lintel above the window?
The window is 1400x1400.
The second question is, how should one size the bottom joist (if that's what it's called) and how does one calculate the pier spacing with respect to that dimension? The length of the bottom joist is 3350mm.
The entire extension's length and width measurements are needed to calculate the appropriate beam dimension over the window. A post construction of this kind will not be stable at the front edge without a diagonal or having some part made with sheet material.
The entire extension's length and width measurements are needed to calculate a suitable beam dimension over the window. A post-construction of this type will not be stable at the front edge without a diagonal or some part being made with panel material.
It is about 3.5m wide and 3.5m long. I found something on byggbeskrivningar.se that seems to translate well to what I'm doing, "Terrace with roof construction". If I fill in the following (unsure what H and Hd should be, left default as it is):
I get:
Now, I have some 45x220 from before and hoped to use these. However, it seems to recommend GL28cs 56×225 Glulam. It is, however, marked in red, so it probably suggests going even bigger. Is it completely unreasonable to use 45x220? Or is it only geo-storm/the day after tomorrow scenarios that require glulam?
Since I won't have a floor, does it matter what I use for the lower support beam? Could I use something like 45x95? Just to hold the posts together.
Now, I have placed some windows at the front. You mentioned that the front edge is not stable without a diagonal. How could one solve this? If I have a 45x220 as the upper support beam, and a 45x220 as the lower support beam, and then try to lay in a 45x45 nailing rule under the windows, is that enough? Or is it not possible to have it like this?
The lintel above the front window can be 45x170 C24. The lower beam at the front edge can be made very slender if you add two extra posts so that the total number becomes five. If you set the roof beams at c/c 400 mm, you can use 45x220 mm lumber. You can do without a diagonal at the front edge either by making the roof rigid or by placing a diagonal in the plane of the roof.
The support beam over the front window can be 45x170 C24. The lower beam at the front edge can be made very thin if you add two extra posts so that there are a total of five. If you place the roof beams at c/c 400 mm, you can use 45x220 mm timber. You can do without a diagonal at the front either by making the roof rigid or by placing a diagonal in the roof plane.
Apologies, I forgot to upload the latest sketch. It follows a design more similar to the description for "Deck with roof construction."
Latest sketch:
Description:
Calculation:
You mentioned 45x170 as the upper support beam but might it have to be 45x220 with the new sketch? It doesn't suggest anything less than 45x220 anyway. When I decreased the cc distance on the roof beams, I get 45x220 as an option, but it is marked in red. What does it really mean, does it mean I can't use it or is it still usable?
There is no disadvantage to a stronger beam over a window. This further reduces deflection. However, 45x170 is sufficient. It is the longest clear span that is decisive. I'm not sure exactly how this calculation app works. However, I suspect that the red marking is due to the deflection being greater than L/300 (one three-hundredth of the span). When a large part of the deflection is due to snow load, it is not quite as critical. I came to a different result, by the way. I forgot to mention that you should have a snow guard on the roof above as extra protection.
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LoweW said:
