Drainage Slope away from Foundation needed

Proper Drainage Slope Is Needed Away From

Your San Antonio Area Foundation

Foundation Drainage Requirements JWK Inspections San Antonio

The illustration above shows proper drainage slope and clearances around the foundation that is needed as per modern standards and minimal IRC requirements. Proper drainage slope based on the International Residential Code is a minimum fall (slope) of 6" away from the foundation for the 1st 10'. Proper clearance above grade to the top of foundation / bottom of exterior cladding is a minimum 4" for masonry areas with a minimum 6" clearance above grade at siding areas.
Proper drainage slope away from a foundation is not just required but needed to help prevent settling that can contribute to unneeded settling issues to the foundation of a building that can affect the entire structure over time.

The International Residentional Code (IRC) & San Antonio City Code requirements call for proper drainage away from your foundation. Whether the construction is in a cities jurisdiction or not the IRC dictates building codes. City codes whether it's for San Antonio, Boerne, Fair Oaks, Garden Ridge, Schertz, etc are based on the International Residential Code (IRC). But if your not in one of those type AHJ (Authority Having Jurisdiction) areas but out in the county without city (AHJ) review of construction, your builder still has to go by the International Residential Code (the governing body for construction) and also the requirements of the engineers that design the foundation for a new home or any other type building. Engineers will at least require the IRC's minimum but some engineers I've seen even require twice the minimum code based on the IRC. Proper drainage slope is always a requirement for certification of the foundation that the original engineer for the structures foundation had designed on a new home or commercial property construction. Engineers will design a foundation, inspect it before concrete pour & provide certification after approval based on their design & requirements of the foundation. 
Slab Foundation design JWK Inspections San Antonio
Images below are from actual engineers foundation plans for inspections performed by JWK Inspections that show they require IRC codes for proper drainage but also that some engineers require twice as much of the minimum IRC requirements for the proper drainge away from the foundation and the clearance of foundation above grade.
 Foundation Grading Drainage Requirements San Antonio JWK Inspections JWK Inspections foundation pre pour inspection engineers drainage grading requirements

The images above & below show information on engineered foundation plans. The 2 samples below show the engineers actually even requiring twice what the minimum IRC requirements are.
 JWK Inspections Engineers Requirements for proper drauinage slope away from foundation JWK Inspections Drainage grading slope requirements commercial engineer

The illustration below shows a Drainage / Grade Level Survey performed by JWK Inspections at a San Antonio area home inspection with the Zip Level System. All the readings were taken at 10' away from the foundation. Requirements call for a minimum 6" fall, slope for that 1st 10' away from the foundation. As seen in the illustration none of the areas met minimum requirements as shown with the documented readings. The red numbers show the inadequate slope in decimal inches. For instance the back left corner has less than an inch slope (fall) with only a 0.8" reading.
JWK Inspection Grading Drainage survey zip level sanantonio

 
  JWK Inspections Drainage Grading Level Survey San Antonio Zip Level Equipment shown at a San Antonio Home Inspection that also included a Grading / Drainage Level Survey by JWK Inspections. Readings were taken at 10' away from the foundation to evaluate needed proper drainage slope as needed as per requirements.