If one were to attempt to design and build a small so-called "A-frame house" oneself, yes, a variant of such with about 1-meter high walls along the long sides to make it a little more furniture-friendly inside. Size about 30/35 square meters of floor space and a small sleeping loft at one end. The studs in the low walls would be made of 170x45 and set at a CC of 600 mm.
What CC distance for the rafters could work then? Thinking about 220x45 and about 7000-8000 mm long high legs/top headers and a shorter collar beam relatively high up, with 17 or 22 mm roof sheathing under the outer roof.
There shouldn't be any snow loads, one would think, with around 60/65 degrees roof pitch and a smooth metal roof, right?
Do you think it could work with like 1200 mm CC?
Of course, one must let a professional calculate this, but it would be interesting at this stage in the thought process to get a sense of this. Looking at sketches/videos from the big country in the west (USA), their rafters look very close together...
Cheers!
Rikard
Edit: there will also be an intermediate floor on about half of the house, not along the entire thing as in the sketch here but open to the ridge on some parts...
As mentioned, 120cm is standard. A designer never calculates the center distance for rafters. Instead, they adjust only the thickness of the beams as needed. In certain special cases, however, one can place an extra rafter between each, achieving cc60. As mentioned, this is very unusual. However, it could be a reasonable solution for your house, where the entire frame consists of rafters. All wall studs and floor joists should have cc60, which could simplify setting the entire rafters at that distance.
Then, of course, there might be an odd measurement for the last rafter, depending on the length of the house.
As mentioned, 120cm is standard. A designer never calculates the center distance of the trusses. Instead, he just adjusts the thickness of the studs as needed. In some special cases, you can place an extra in between each one to get cc60. As mentioned, this is very unusual. However, it could be a reasonable solution for your house, where the entire frame consists of trusses. All wall studs and floor joists should have cc60, whereupon it might simplify placing the entire trusses at that distance. Of course, the last truss might naturally end up with an odd measurement, depending on the length of the house.
In this case, I am considering having walls, albeit low ones (about 1000mm) with a CC of 600 mm.
But it would be nice if it were possible to make the roof with CC 1200 with the dimension of timber I was considering - basically half the work and half the material cost...
/Rikard
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