OldMule
Student
- Apr 23, 2022
- 2
Hi there,
I am designing a home (1 storey, with an attic space loft facilitated by attic trusses) and the soil is classified as SW=SM. d10=0.072, d60=0.22, Cu=3.1, K=5.18E-03 cm/sec
I was initially told that the site was approved for a steel building to be build, with a slab on grade foundation. I began drawing the home, but upon further conversation with the owner, he revealed that the water table was very high (3'10" from surface) and he did not want to have to constantly pump water. He told me that he has excavated roughly 6 feet down and filled the site with 'a' gravel, compacted in small lifts. He has asked that I use a shallow frost protected insulated monolithic slab foundation. The proposed construction would be a 38x32 building, as described in my first sentence. The roof (to be designed by the truss manufacturer, is requested to use roughly 40% attic trusses, and the remaining 60% to be a vaulted or cathedral style, which would maintain the same roof lines as the rest of the roof. The site is in mid-northern Ontario, Canada. Snow load is ULS: 1.44kPa, 30.1psf, SLS: 1.3kPa, 27.1psf
I have several questions:
1. Using the information provided, would the soil be sufficient to bear a wood-framed building of no unusual design, on a monolithic shallow frost protected slab.
2. I have already begun working, under assumed site conditions, and it was then revealed to me that the conditions are not as initially described... what should I do?
I am designing a home (1 storey, with an attic space loft facilitated by attic trusses) and the soil is classified as SW=SM. d10=0.072, d60=0.22, Cu=3.1, K=5.18E-03 cm/sec
I was initially told that the site was approved for a steel building to be build, with a slab on grade foundation. I began drawing the home, but upon further conversation with the owner, he revealed that the water table was very high (3'10" from surface) and he did not want to have to constantly pump water. He told me that he has excavated roughly 6 feet down and filled the site with 'a' gravel, compacted in small lifts. He has asked that I use a shallow frost protected insulated monolithic slab foundation. The proposed construction would be a 38x32 building, as described in my first sentence. The roof (to be designed by the truss manufacturer, is requested to use roughly 40% attic trusses, and the remaining 60% to be a vaulted or cathedral style, which would maintain the same roof lines as the rest of the roof. The site is in mid-northern Ontario, Canada. Snow load is ULS: 1.44kPa, 30.1psf, SLS: 1.3kPa, 27.1psf
I have several questions:
1. Using the information provided, would the soil be sufficient to bear a wood-framed building of no unusual design, on a monolithic shallow frost protected slab.
2. I have already begun working, under assumed site conditions, and it was then revealed to me that the conditions are not as initially described... what should I do?
