This Architectural Drawing is AutoCAD 2d drawing of Pile Cap Section detail Drawing. A pile cap is a thick concrete mat that rests on concrete or timber piles that have been driven into soft or unstable ground to provide a suitable stable foundation. The overall depth of pile cap shall also be selected such that the effective depth of bottom reinforcement is at least 12 inches. Foundation types vary, but likely your house or home's addition does or will have one of these three foundations: full or daylight basement, crawlspace, or concrete slab-on-grade. For more details and information download the drawing file.