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Rubble Trench Construction |
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Our foundation trench is 18 to 24 inches deep and was dug manually using a pick and shovel. The slight slope of the trench floor was created to allow water to escape out through the exit drain on the north end of foundation. The width of the trench is 24 inches. After completing the trench we added 2 inch extruded polystyrene (gray board) to the outside wall of the trench for insulation. A two inch layer of drainage gravel was tamped on the trench floor and the 4 inch diameter perforated drainage pipes were installed. We had to cut little "pie" shaped segments at about 3 foot intervals to allow the straight 10ft pipes to conform to the circular shape of the trench. After the pipes were installed (including the exit drain pipe), more gravel was poured into to the trench. The trench was completely filled except for the remaining 6 inches which was required to start the stone foundation. Before installing the stone foundation, landscaping cloth was installed over the rubble drainage to prevent fine dirt or silt from getting into and clogging the rubble drainage. |
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Once we selected our building site, we laid out location of our studio using rocks. |
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The foundation trench took about 15 hours to complete. |
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After lining trench floor with a 2" layer of gravel, the insulation and perforated drain pipes were installed. |
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Kristina loads another wheelbarrel with gravel. |
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After about 30 wheelbarrel loads of gravel, the rubble trench is finally completed. |
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A drain exit is installed to allow water collected in rubble trench to escape to daylight. |
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