Map the geology: Blaine sits on glacial till with pockets of Anoka sand plain to the west and seasonally saturated clay loam to the east toward Coon Creek and Lino Lakes. Explain how each soil type behaves under load and during freeze-thaw cycles.
Map the geology: Blaine sits on glacial till with pockets of Anoka sand plain to the west and seasonally saturated clay loam to the east toward Coon Creek and Lino Lakes. Explain how each soil type behaves under load and during freeze-thaw cycles. Clay-loam: expansion in spring,
Map the geology: Blaine sits on glacial till with pockets of Anoka sand plain to the west and seasonally saturated clay loam to the east toward Coon Creek and Lino Lakes. Explain how each soil type behaves under load and during freeze-thaw cycles. Clay-loam: expansion in spring, contraction in fall, stair-step cracks in block foundations, lateral pressure on 1970s walkout walls. Sand plain: drains well but settles, leaving negative grading toward foundations within 5-7 years of new construction. Cover frost depth (42-60" in Anoka County) and why pre-1980 garage slabs and stoops poured at 36" now heave. Show how to read foundation cracks: hairline vertical (cosmetic), stair-step (clay pressure, monitor), horizontal mid-wall (active failure, engineer immediately). Close with what to look for and a CTA for foundation inspection.
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Clay-loam: expansion in spring,