thanks guys, i appreciate it. no i haven’t been doing any sketching recently but i used to draw random isometric projection stuff when i was bored in high school and it finally became useful for something
this design was something i thought up pretty shortly after i decided at the end of last year that i’m definitely going to build myself a cabin this year. there were a few ideas bouncing around in my head but after mulling it over i think this design is perfect for both maximizing on space and minimizing on material cost as well as being very efficient to keep heated in the winter, all while looking pretty darn cool in my humblest of opinions
in all of the projects i’ve built so far there’s been some sort of lofted area in the negative space between the walls and the roof but it’s always been intended for storage and not for active use so i’ve never really gone out of my way to do the more complex load bearing analysis for a second story, however the thought of building a proper second story has intrigued me this whole time as it requires a lot more involved thought than is typically required for single story constructions; furthermore, after building gabe’s house i’ve realized that there’s a definite reason that most houses in northern climates are composed of at least two stories: heat rises. if you can utilize the uppermost space of a building with a static heating element like a wood stove, you’re effectively using the bulk of heat that would otherwise be wasted near the ceiling or in the rafters
to support the second story, i’m pivoting the center joist atop the front wall of the first story which will be built with 2x6’s rather than 2x4’s to better hold the load from the second story’s central joist. because a 2x6 can reliably span eight feet under standard load conditions spaced 16” on center, this means no further support beams will be needed except for the interior end joist which will span 16 feet between the inside walls. in the plans i wrote that i could easily nail two 2x6x16’ boards together to increase the effective span from 8’ to 12’ and drop a 4x4 timber to the first floor to prevent sag, but while thinking earlier today i realized that it may very well be possible to place the second board below the end joist rather than along it, which should behave like a single 2x12x16’ board which has an effective span of 16’ while still being well above the head of even a tall person in the living room while eliminating the need to break up the downstairs space with a support timber. if this method does not work as planned and the end joist begins to sag, i can easily readjust the joist with a hydraulic jack and place a 4x4 timber at the 4’ mark as indicated in the front-side projection as necessary but i would like to give this method a try. the exterior floor joist for the second floor will be held up with three 6x6 timbers cemented in the ground that will form the boundary of the porch which will be covered by the overhang of the second story. no 2x6 board is spanning more than 8’ in distance so there’s no concern about carrying the load, though i decided to go with much more expensive 6x6 timbers over 4x4 timbers just to make sure nothing bad happens p:
by ending the gable roof at the end of the interior portion of the upper story i can cut the cost of the rest of the roof in half by changing it to a skillion leading down to the back of the cabin, but the primary motivation of doing this is to prevent wasted heat accumulating in a tall space that would otherwise be unoccupied. by insulating the skillion portion between the floors, more heat from the stove is encouraged to head up towards the second floor which further increases the efficiency of heat distribution in the cabin. the pitch of the skillion will provide head-space for a proper staircase to be built along the wall to allow easier access between floors, currently i just use ladders to get into lofted spaces in the other buildings but i’ve always wanted to try building an interior staircase. if a support timber isn’t necessary between the upper and lower floor inside i will likely not build a closet into the underside of the staircase but rather incorporate the negative space under the stairs into the room somehow, perhaps as an open pantry or some other function. in smaller buildings like this you’ll feel less cramped by decreasing the count of interior walls blocking your view, and ideally the ground floor won’t have any partial walls blocking anything. having the porch built into the structure is a nice touch as well, as there will be no further costs required to frame and roof the porch and it’ll look pretty darn slick below the upper floor
i’m pleased to see the cost of lumber has decreased so much since 2021, the entire cost of raw lumber for this cabin will cost the same as just sheathing gabe’s house did then. with insulation, roofing, windows, doors, and trim, the total cost of this cabin will likely end up being closer to 8-9k but even that is a pretty affordable price. i still need to plan the exact placement and size of windows and the door to exactly calculate the amount of studs required to frame the openings with the proper load-bearing considerations but for a rough estimate on the lumber cost, this should be a pretty accurate figure
