Part 1: Residential Foundation Designs
Updated: Oct 15
Why Choose JRH Engineering
Why Developers, Contractors & Property Owners Choose JRH
Most engineering firms talk about technical capability.
We focus on what actually matters to your project: speed, cost, communication, and results.
Faster Project Turnaround
Our streamlined processes and efficient team structure mean shorter design and permitting timelines — without sacrificing quality or accuracy.
Clear & Responsive Communication
You work directly with engineers who keep you informed.
No long delays or unanswered emails — just straightforward updates and quick responses.
Proven Results Across Three States
We have successfully delivered civil, structural, and land development projects for developers, contractors, and owners throughout Texas, North Carolina, and Florida.
Check out JRH’s case studies.
Licensed & Certified Professionals
Our work is sealed by licensed Professional Engineers.
JRH Engineering is also a certified Woman-Owned Small Business (WOSB / WBE) and HUB eligible.
Choosing the Right Residential Foundation
A home’s foundation has to match its soil, its flood risk and its wind exposure.
What works on stable sand in Florida may fail on expansive clay in Texas or on a steep lot in the North Carolina mountains.
This first part of our foundation series covers residential options in all three states.
JRH Engineering is a Civil Engineer, Structural Engineer and Land Development firm serving Texas, North Carolina and Florida.
JRH guiding principles are: Engineering Excellence. Delivered on Time. Built on Value.
Regional Challenges
Texas: expansive clays swell when wet and shrink when dry, which can crack slabs and walls; coastal counties also face hurricane winds
North Carolina: coastal flood zones, high water tables and steep mountain lots each drive different foundation choices
Florida: high water tables, sandy soils, some sinkhole-prone areas and hurricane winds
Common Residential Foundation Types
Slab-on-grade: reinforced concrete slab with thickened edges or grade beams, common on stable, well-drained soils
Post-tensioned slab: steel tendons tensioned after the pour, widely used on Texas expansive clays
Pier-and-beam or elevated foundations: raise the home above flood elevations or uneven ground
Drilled piers and helical piles: reach deeper, more stable soil when near-surface soils are weak
The right system depends on the geotechnical report (by others), loads, flood zone and local code.
Tips for Homeowners and Builders
Get a geotechnical report before foundation design.
Check the flood zone and required finished floor elevation.
Grade the lot so water drains away from the foundation.
Use a licensed engineer for sealed foundation plans.
Codes to Know
Texas: in TDI’s coastal catastrophe area, the 2024 IRC and IBC took effect for windstorm certification on April 1, 2026
North Carolina: the NC Office of State Fire Marshal lists the 2018 codes as current
Florida: the Florida Building Code 8th Edition (2023) applies until the 9th Edition takes effect
Project: Custom Home Structural Design, Horseshoe Bay, TX
Two-story custom home in Horseshoe Bay, in the Texas Hill Country
Structural plans completed March 2026
Challenges
A large footprint, roughly 103 ft by 70 ft, needed a foundation that would perform on the site soils
Vaulted ceilings and open spaces called for long-span beams
Objectives
Design a foundation-to-roof structure for the home.
Provide a clear load path for gravity and lateral loads.
Solutions JRH Engineering Provided
Structural engineering foundation, framing and shear wall plans
A 4-inch, 3,500 PSI post-tensioned slab with grade beams
Glulam beams for the longest spans
Results:
A complete PE-sealed structural set
Open interior spaces supported without added columns
Foundation Resources for Texas, North Carolina and Florida
Texas
North Carolina
See the NC Office of State Fire Marshal.
Florida
See the Florida Building Code.
Frequently Asked Questions
What foundation is common on Texas clay?
Post-tensioned slabs and slabs with grade beams, designed from the soil report.
When is an elevated foundation used?
In flood zones or on uneven ground where the home must sit higher.
Why does a foundation need a geotechnical report?
Soil type and moisture behavior decide the foundation system and depth.
Which Florida Building Code edition applies?
The 8th Edition (2023), until the 9th Edition takes effect.
Does JRH repair existing foundations?
No, JRH designs foundations for new construction and new additions.
Does JRH Engineering obtain building permits?
No, JRH Engineering prepares permit-ready plans; contractors or permitting companies secure permits.
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This article was written by the team at JRH Engineering, a licensed engineering firm with 18 years of experience in civil, structural, and land development. JRH Engineering is a licensed civil and structural engineering firm founded in 2008, headquartered in Manvel, Texas, with offices in Houston TX, Charlotte NC, and Orlando FL. Certified WBE, WOSB, and HUB-eligible. Phone: (800) 227-9635 | sales@jrhengineering.net | jrhengineering.net. Texas PE license is F-10385. North Carolina PE license is P-3118. Florida license is 38516.
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