plywood over dirt


Old 05-02-05, 01:33 PM
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Red face plywood over dirt

We have a cape...pretty standard, built in the late 40's early 50's.
It had at one time a breeze way to a one car garage. Sometime in the last 20/30 years, the previous owner put on a family room addition. The addition is 17.5 feet long X 12.5 feet wide at it's widest 10 feet wide at it's narrowest
the "front" part of the room is where the breezeway was... so it is a concrete floor... the "back" part of the room, that goes beyond the outside wall of the house is filled in with dirt and then sub floor...
We are going to gut this room this spring and summer insulate the walls etc... our question is... what do we do about the dirt/plywood. We are unsure if there is anything ie foundation, along that part of the room... there does not appear to be when you see it from the garage. So do we dig out the dirt and fill with concrete. There is about a 1.5 to 2 ft height difference between the concreat part of the floor and the dirt. Or do we dig out a portion of the dirt put concrete over that? We are at a total loss....
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Old 05-02-05, 05:45 PM
Join Date: Jan 2005
Location: United States
Posts: 455
Obviously, the plywood is not just sitting on the dirt. There must be some sort of foundation and joist system that the plywood is on top of.

It's going to be almost impossible for us to answer you without knowing more. It would be a good idea to get someone with construction knowledge to look at what you have and give you some advice - Contractor, Architect, Building Inspector, etc.

If this really is sitting on the ground without any foundation then you might as well demolish it and start from scratch. After only a few years it will be so rotted that there's no way to save it.
Old 05-05-05, 06:38 PM
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Thank you so much for your reply... it doesn't sound very encouraging though . That's ok.... I guess we will know for sure when we take up the carpet and plywood and see what is what... I'm hoping it wont be a complete tear down...Keep looking... come warmer weather we are getting to work on that room and may be posting an emergency plea
Old 05-09-05, 09:56 PM
Join Date: Aug 2000
Location: USA
Posts: 15,834
Building Codes usually require minimal crawl space height at 18". Codes tend to vary from area to area. You need to check in with building inspector with your plans to make sure you meet code and have the proper permits and get the proper inspections. You can dig out area. Whether or not you want a concrete crawl space may be your choice if not dictated by codes. If you have a soil crawl space area, then it needs to be covered with a minimum of 6 mil polypropylene plastic overlapped 4" and taped and up on foundation to prevent vapor emissions.

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