I have an old barn that was moved to its present location in the 1960's. It was built in the early 1900's and is about 2,000 sq ft. It is like a bank barn (with a wooden floor), but the lower part is only a crawl space.
The foundation was not built correctly. It was built with concrete blocks, but there is no reinforcement (cement or rebar inside the blocks). The barn actually just rests on the blocks, there is nothing that ties the sill beams (which are large oak beams) to the foundation. It is built into a small hillside...it is about 3 feet higher on one side than the other. The wall on the downhill side is leaning over rather severely. I believe it is being pushed by the opposite side of the barn, which has all the dirt pushing against it, since it is on the uphill side. The barn itself is not leaning yet. I have installed diagonal braces, set in concrete, pushing back against the leaning wall to prevent it from moving any further.
The gutters are functional, but it is in an area with a high water table. Certain times of the year, the water table is only a foot or less below the surface, and any hole dug will fill up with water. I have dug out the foundation all the way around the barn, down to the footer. It is 4 feet down to the footer on the uphill side and about 2 feet down on the downhill side (the footer has "steps" in it so it is not all at the same level). I pulled out many large pieces of concrete (looked like old sidewalk pieces), some weighting hundreds of pounds, and misc broken concrete blocks and such that were used as back-fill. These were pushing in on the wall and damaged it in some places. I might eventually put a couple concrete piers under the damaged areas, but not right now.
The footer extends under the wall about 18" on the outside and does not extend inside at all. There is no drainage tile. The reason I dug it out is so that I can lay a drainage pipe, but I have some questions about how to do this.
I am planning to lay perforated plastic corrugated pipe on top of the footer. I know some people say to lay it beside the footer, but I don't want to dig my trench out wider and there is no basement here to keep dry (like there would be on a house). The main reason I need drainage here is to reduce the force pushing on the walls when the dirt is full of water, especially in the spring.
The pipe will run out to a daylight drain about 50 feet away.
Should I fill my entire trench in with gravel? Or gravel on the bottom and dirt on top?
The soil here is about one foot of top soil and then heavy clay below that. I don't want the dirt to clog up my drainage pipe, or to get mixed in with my gravel and defeat the purpose. Should I line the edges of my trench with something?
I have heard some people say to wrap the pipe with drainage filter fabric, and others say not to use it because it will clog up and not allow water to pass through. I am thinking about installing a vertical pipe at each corner, tee'd into the drainage pipe, that will come up above the ground that I can use for clean-outs.
I need to finish this soon. I want to do this correctly without breaking the bank. And no, I am not going to build a whole new foundation. It would be near impossible to lift this barn because some of the floor beams are broken (from previous owner parking heavy eqiupment on them), and a lot of the weight sits on concrete block piers underneath the barn.
Thanks for any advice...
The foundation was not built correctly. It was built with concrete blocks, but there is no reinforcement (cement or rebar inside the blocks). The barn actually just rests on the blocks, there is nothing that ties the sill beams (which are large oak beams) to the foundation. It is built into a small hillside...it is about 3 feet higher on one side than the other. The wall on the downhill side is leaning over rather severely. I believe it is being pushed by the opposite side of the barn, which has all the dirt pushing against it, since it is on the uphill side. The barn itself is not leaning yet. I have installed diagonal braces, set in concrete, pushing back against the leaning wall to prevent it from moving any further.
The gutters are functional, but it is in an area with a high water table. Certain times of the year, the water table is only a foot or less below the surface, and any hole dug will fill up with water. I have dug out the foundation all the way around the barn, down to the footer. It is 4 feet down to the footer on the uphill side and about 2 feet down on the downhill side (the footer has "steps" in it so it is not all at the same level). I pulled out many large pieces of concrete (looked like old sidewalk pieces), some weighting hundreds of pounds, and misc broken concrete blocks and such that were used as back-fill. These were pushing in on the wall and damaged it in some places. I might eventually put a couple concrete piers under the damaged areas, but not right now.
The footer extends under the wall about 18" on the outside and does not extend inside at all. There is no drainage tile. The reason I dug it out is so that I can lay a drainage pipe, but I have some questions about how to do this.
I am planning to lay perforated plastic corrugated pipe on top of the footer. I know some people say to lay it beside the footer, but I don't want to dig my trench out wider and there is no basement here to keep dry (like there would be on a house). The main reason I need drainage here is to reduce the force pushing on the walls when the dirt is full of water, especially in the spring.
The pipe will run out to a daylight drain about 50 feet away.
Should I fill my entire trench in with gravel? Or gravel on the bottom and dirt on top?
The soil here is about one foot of top soil and then heavy clay below that. I don't want the dirt to clog up my drainage pipe, or to get mixed in with my gravel and defeat the purpose. Should I line the edges of my trench with something?
I have heard some people say to wrap the pipe with drainage filter fabric, and others say not to use it because it will clog up and not allow water to pass through. I am thinking about installing a vertical pipe at each corner, tee'd into the drainage pipe, that will come up above the ground that I can use for clean-outs.
I need to finish this soon. I want to do this correctly without breaking the bank. And no, I am not going to build a whole new foundation. It would be near impossible to lift this barn because some of the floor beams are broken (from previous owner parking heavy eqiupment on them), and a lot of the weight sits on concrete block piers underneath the barn.
Thanks for any advice...