Keep on mind that there are different ag zonings as well. There is ag1 ag 2 and reserve ag. If I were you (and I'm not), I'd be checking with your local township officials before doing anything. Nothing worse than embarking on any project and then finding out you are not in compliance and have to demo what you did or pay a healthy fine.No real zoning. It’s all Ag around us for miles.
A few phone calls to find out the do’s and dont’s can’t hurt.Keep on mind that there are different ag zonings as well. There is ag1 ag 2 and reserve ag. If I were you (and I'm not), I'd be checking with your local township officials before doing anything. Nothing worse than embarking on any project and then finding out you are not in compliance and have to demo what you did or pay a healthy fine.
Just so happens my wife is the chair of the local zoning board here so I get to observe the grief. here at least people think (wrongly) they can do whatever they want and that isn't the case at all.
Zoning protects property values and keeps the riff raff out. No one wants a mobile home next to a 300 grand house, at least not here.
The fines here start at 5 grand and go up, way up.
Just a word to the wise, nothing more.
It’s hard to justify floor heat.I highly, highly, recommend insulating under the concrete with 2" foamboard. I also highly, highly recommend installing hydronic heat piping in the floor. The piping will cost you $500-ish. Can't add later. By your descriptions this building will be an all season structure.
I'd also recommend the slab have poured footings all the way around the outside. Then 2x6 stud build the structure. Initially you will think that's too expensive. But after you pencil it all, especially since you are finishing the inside, you'll see that it's very competitive.
I'm a bit concerned about your insulation description. Everyone here says you will create a moisture problem within the structure if you spray foam everything. It's recommended to do 2" spray foam on the walls. Then blow in Cellulose or fiberglass R-45 minimum in the ceiling.
This is definitely a worthwhile project to assist your FIL and fulfill a long term need for your wife.
I understand the floor heat hesitation. I'll say, if you insulate the floor, definite lay the piping. But with your sporadic use, don't insulate the floor just so you can lay the piping. The insulation is the expensive part. Personally, in our location I wouldn't pour a slab with all season use intended without insulating it.It’s hard to justify floor heat.
Typical winter use will be very sporadic. Under slab insulation has been discussed
Our ceiling will be exposed. The plan is to paint directly on the 2” of spray foam (white, dry fall paint) to keep the “house” side bigger feeling
I realize an air exchange system/dehumidifier may be necessary. Current plan is a mini split system of approx 12,000 btu with some supplemental heat in the bathroom. It’s what our current “barndo” on the property has and it seems to work fairly well.
Slab heat is NOT efficient for sporadic use. Not at all. Changing the temp within a heated building by 1 or 2 degrees may take 24hrs.This years “schedule” for father in law is as follows
Illinois-May thru mid June
Travel to Montana/Wyoming/etc June-August
Illinois- Sept thru early Nov
Florida-Nov thru April
Very sporadic weekend use of the “house” side of the new building the rest of the year.
Not sure how efficient slab heat would be for weekend use only.
Currently we drain all water, shut off hot water heater and set mini splits to their lowest temp (60) when we leave on Sunday.