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| Std Heartland | Opt All American |
| 3/4" Plywood core | Foam core Insulated |
| The backbone of the MD Building System is the walls. The standard walls are a 3/4" exterior grade CDX plywood with galvalume/zincalume laminated to both sides. The optional All American wall offers an R-11 insulation value with it's foam core surrounded by steel laminated plywood. | |
