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Hi, thanks for the thoughts. Yes, the structural integrity or at least structural capacity of the cans is developed in conjunction with the internal pressure. No, this is not a school assignment, it's a personal project. The actual intention is to use stacked water-filled cans for thermal...

I'm curious, but ill-equipped to analyze: if I have an aluminium can, let's say 12 oz volume. I fill it with water and nitrogen, to create a 2 Atm internal pressure so it is structurally robust (i.e. can be stacked). My understanding is that the can is capable of withstanding 6 Atm of pressure...

I'm brand new to Draftstyle (first day: pretty impressed), and am just using it for some very simple arch details right now. I want to use the Batting linestyle to add insulation to my details. It works reasonably well in model space, but fails on Sheets: vs. The problem is one of scale...

Thanks for the replies! In fact, edge to edge installs (these roofs have parapet walls, typically, between adjacent row homes, so "parapet to parapet" installs) are the most common way of avoiding structural tangles on these projects. And yes, in those cases where rafter-mounts are happening...

I'm hoping to get some opinions. Very short summary: Assume existing, older, small, flat residential roofs with framing that don't meet modern code by a significant margin. Should it be generally allowable to add solar to them (on the order of 4 psf) without engineering (which, as explained...

Hokie & dhengr: thanks for your thoughts. I'm a building official. I'm not trying to put any engineers out of business, very very few that submit plans get beyond the 7-10" embedment... so should I just ok those b/c they're the ones that signed the sheet? You all might want to see what's...

So these are pre-existing rowhouses, like you see by the mile in many cities. The roof framing is typically not up to modern code, so it's thorny for installers to do anything that relies on it. Much more common is to span the party walls, it leaves the roof alone. I'm not sure what else you...

No, this isn't tokenism, sorry if I didn't explain adequately. This is about installing Solar PV systems on existing roofs. They are going up by the thousands around the country, and yet I (and presumably many other interested parties also) can't find reliable information on what makes for a...

Thanks Hokie! Just to be clear: these are not freestanding walls, they are either the outside/end wall of a duplex or rowhouse/townhouse, or they are a party wall in such a structure. There is no option of "pre-existing" anchorage, these are retrofits. What I am looking at has happened over and...

I have to look over engineering analyses of uplift of beams attached to the top of a brick wall. The wall is 12" wide multiwythe unreinforced solid brick, the uplift force is typically between about 300 and 1000#. I'm not an engineer but my physics background helps me follow the reasoning and...