Is your crawl space floor finished or sealed? What are the soils? Is it damp? We've done several unoccupied crawl spaces and have put a 6mil. poly down as a vapor retarder. Now the code dictates that a 10 mil. vapor barrier under all slabs is required. I'm not saying you need 10 mil., but a 6 mil. would contain the moisture under that space. If your soils are sandy and dry then venting below the vapor barrier would probably not be necessary. If you think it will be then a run of 4" perforated drain tile scratched into the soil under the vapor barrier as a way to vent it. A run in the center with trunks off of it is effective. Hook onto or continue one end to an outside source and let it breath. If you don't think the moisture in the crawl space is high than a vapor barrier may not be needed. I have seen assemblies that have installed a fan on a humidistat to control the moisture, but again a simple free air vent might do the same for you.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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