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Old 09-12-2016, 06:16 PM   #15
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2015 Interstate Ext. Coach
San Diego , California
Join Date: Feb 2014
Posts: 640
Here's mine

40' deep, 50' wide, 12' ceiling


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Old 09-27-2016, 05:45 AM   #16
3 Rivet Member
2012 Interstate Coach
norman , Oklahoma
Join Date: May 2011
Posts: 227
I put a sewer clean-out in my garage and I've been pleased that it has not been an issue with stink or spillage when using it to dump the tank. I positioned it so that when the RV is parked it's just a couple of feet ahead of and to the side of the macerator reel. I also put a fresh water supply line in the wall right there so I can fill the tank or use it to flush the black tank.

I put an exhaust fan in the ceiling positioned directly over my black tank vent. It's a good idea to keep ANY attached garage under a slight vacuum so that fumes and off gassing from all the various chemicals in your garage are encouraged not to commute to your living space. With an RV parked inside there I felt this was critical.

I actually have three separate fans in the garage. The 80 CFM Panasonic bath fan runs 24/7 to maintain that slight vacuum (very slight as the garage space is about 12,000 cubic feet; 1,000 square feet, 12 foot ceiling) so that's only one air change every 2.5 hours. I also have a 380 CFM bath fan (again panasonic) mounted in the ceiling right next to the 80 cfm unit. I have not used this much but when I was building the garage I did not know what to expect as far as black tank fumes in a sealed space. We use the Interstate regularly around town and make frequent use of the facilities. I dump at least once a month but it's frequently parked indoors with "stuff" in the tank so I was concerned. Never mind the bio waste, I did not like the idea of the treatment stuff venting into the garage, though since the bus came indoors I have switched to one that does not contain formaldehyde. With the little 80 cfm unit going all the time I've never had an issue though I'm glad I have the bigger unit there just in case. I also have a "shop" fan mounted in the wall of the garage. It's a big commercial style unit with automatic louvers and will practically pop your ear drums if you run it with the doors closed. I put it in so that when I get around to putting in my lift and I'm doing stinky stuff (brake cleaner for example) to one of the cars I can crack a garage door and get good evacuation ... again don't want any of that migrating to the house. Side benefit is I can actually use it as a whole house fan. If we burn something in the kitchen, I open the kitchen window and go turn on the shop fan and leave the door into the house open. Have also used it to just do an air change on the house during a nice spring or fall day. Turn on the fan, open the garage door and go room by room opening windows. It would be bad to do that without a window open though because it puts the house under so much vacuum that you would back draft your exhaust flues (water tank, furnace, chimney). Side note, since every shop fan I've ever seen was a terrible hole in the insulation envelop not to mention that even with the louvers they are far from air tight, I built an insulated "closet" with an exterior door to cover the shop fan opening. To explain that more simply I put the fan inside an insulated, sealed closet. For climate control I also have a 3 ton mini-split in the garage. I heat it to 50 in the winter and cool it to 80 in the summer. Unless I'm working out there, then I make it comfortable. Well insulated and sealed commercial style shop doors are a must. And yes the tracks eat up some ceiling space so 12' is the minimum ... I wish I had done 14'.

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Old 09-27-2016, 06:29 AM   #17
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2006 22' Interstate
League City , Texas
Join Date: Oct 2014
Posts: 1,288
Originally Posted by russ240 View Post
...For climate control I also have a 3 ton mini-split in the garage. ...
Hah - I've got a guy coming over to our house this very morning to give me a bid on a mini-split. Our garage is not tall enough to accommodate our Interstate, and we would have to change our roof line in order to make it so (we would probably never recoup such an investment so that's not presently on the table), BUT, we do so many garage projects that we've decided to take the plunge. The straw that broke these camels' backs was many hours of metalworking this past summer when we fabricated our custom hitch carrier. It was so danged hot with many days approaching 100 degrees and we were out there for so many hours, especially my husband. This absolutely must change.

So yes, if you are custom-building a garage, bite the bullet and pay for the climate control up front. It's easier and cheaper than retrofitting as we are doing now.

This next part may be obvious but let me say it just in case. A lot of these types of improvements are not easily mortgage-able, so you better figure on paying cash for them if you really are planning your dream garage. When my husband and I had our house customized, the builder drew the line at certain improvements and the reason is very simple - it might not appraise if there is too much piled into the initial build, and if it doesn't appraise, a mortgage won't be approved. We were willing to raise our downpayment substantially to mitigate the perceived risk, but they still didn't want to mortgage it beyond a certain point (when we signed the contract on this place, we were eons away from retirement with a child to put through university, so we were not anywhere close to being in a position to go all-cash on the build). Blame the financial crisis of 2008 for the skittishness.

We did negotiate successfully for about 70 modifications on the base plan, and we did get the 800 SF garage we absolutely had to have, but beyond that, the garage was off the table in terms of HVAC and insulation and roof-line modifications. Now I have to go back and insulate it myself as well as adding an air conditioner. Good dead-of-winter projects for homeowners who live on the steamy Texas Gulf coast.

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