I didn't realize that the lumber yard could provide expert consultation in this way, so that suggestion was very helpful. I'd love to lower the foundation, but at what expense? Going lower on the foundation would have meant double the drilling since now I'm exposing more ledge area and it's more solid. Laminated veneer lumber (LVL) is one of the most commonly engineered wood materials used in construction. That got me an extra foot in the basement, to a 7' ceiling if I used 2x8's for joists. I spent a week drilling holes (130) in the ledge and pouring in Dexpan to break it up to the point where a small hammer on a skid steer could bust it out. Blasting is not an option due to cost, and I doubt that any demolition person would do that when it's right next to another structure. When we dug the hole, we hit ledge at 6 feet down. I may keep the 8" LVLs and use them to stiffen the floor in the older section.Īs for "refusing" to drop the foundation, or raising the floor: It would be better to say I'm having to make choices. This will still be much better than the house I'm adding on to where the floors are carried by 2x8's sitting on horizontal 4x4's resting on piers every 6 to 10 feet. He said that if I used a triple 12", then the floor would be perfectly stiff, but the double would be fine. Said that if I put in a center post, I could stay with the 8", but I don't want that. I dropped in on them this morning and after looking it over and doing some calculations, they said I needed to swap out my 8" LVLs for 12". I'm getting my materials from Hancock Lumber in Conway, NH.
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