By Wichita Barndominium Builders Team · Last reviewed: September 19, 2026
Coordinate the building structure, soil conditions, drainage, floor uses and concealed systems before placing a barndominium slab. Ask for project-specific foundation drawings and a documented pre-pour review. The slab's dimensions, reinforcement, connections and moisture protection should follow the design; there is no single thickness that this guide can responsibly prescribe for every Wichita-area home and shop.
The foundation is one stage of the complete Wichita barndominium planning sequence. Use this page to prepare questions and records for the designer and contractor, not to substitute for their specifications.
Separate the building support from the floor-use requirements
The foundation must support the proposed structural system, while the floor must suit its intended use. Ask the designer to identify how these roles are handled. A shop with concentrated equipment loads, a residence with moisture-sensitive flooring and a porch exposed to weather can need different details within one project.
Provide actual equipment information before design. For a vehicle lift, give the selected manufacturer's foundation and anchorage requirements to the foundation designer. For a heavy storage area or mezzanine, identify locations and intended loads. If you want a safe room, have its designer coordinate support and anchorage before the pour rather than assuming a later surface attachment will work.
Coordinate building reactions, anchor locations or post supports with the supplier's released drawings. Ask who verifies the setting-out dimensions and who approves discrepancies. Keep the building supplier and foundation contractor on the same revision before either commits to irreversible work.
Establish the site's finished elevations and water path
Before excavation, identify the building location, proposed finished floor, exterior grades and drainage outlets. Show porches, overhead-door approaches, walks and driveways together. An isolated slab elevation does not explain where roof runoff or surface water will go after the rest of the site is finished.
If the site involves mapped floodplain, consult the responsible reviewer before grading. MABCD's floodplain guidance covers development activity as well as buildings in the relevant designated areas. A grading plan and floodplain determination answer different questions and may both be needed.
Ask the site contractor to define topsoil removal, fill material, placement, compaction and verification in the scope. Have the geotechnical and foundation professionals establish the soil-related design requirements. Do not use the appearance of dry ground as the acceptance test for support below a permanent building.
Require a slab moisture strategy
If finished flooring will be installed, coordinate the slab with the flooring system before placement. NRMCA's slab-moisture guidance identifies moisture below and within a slab as relevant to flooring performance. A concrete surface that looks dry is not the same as a verified substrate ready for a specified flooring product.
Ask the designer to specify the under-slab moisture-control assembly, seams, penetrations and connection at edges. NRMCA's vapor-retarder guidance discusses materials intended to limit moisture transmission from below. The contractor's proposal should identify the actual product and installation details, not just “plastic under slab.”
Before pouring, inspect and document the installed membrane and repairs after the other trades have worked. Protect the assembly from damage during placement according to the approved procedures. For final flooring, require the testing and acceptance criteria specified by the selected flooring and adhesive manufacturers.
Coordinate everything that becomes inaccessible
Create a single pre-pour layout showing plumbing, electrical routes, sleeves, any heating loops, floor drains and other approved concealed components. Confirm finished fixture positions against the current room plan. Check that an interior-wall change has not left the drain or toilet location based on an obsolete drawing.
Include a discussion of radon-resistant construction with the designer. EPA's construction guidance describes a coordinated sub-slab gas pathway, membrane, venting and sealing approach. Ask what is appropriate for the project and how testing and any future fan provision are addressed. The presence of a membrane by itself should not be presented as a complete radon system.
If radiant-floor tubing is planned, coordinate it with joints, anchors and future drilling locations. Ask the installer what pre-pour verification and documentation the selected system requires. Save measured photographs and final layouts. A later owner should be able to identify concealed work without relying on someone's recollection.
Use a pre-pour hold-point checklist
This original checklist is intended for a coordinated meeting. It does not replace required inspections or the contractor's quality-control procedure.
| Hold point | Evidence to have available | Who should resolve an open item |
|---|---|---|
| Location and elevations | Current survey/layout and approved site plan | Surveyor and site/foundation designer |
| Supporting ground | Specified preparation and required verification records | Geotechnical professional and contractor |
| Structural coordination | Current foundation plan and supplier information | Foundation designer and building supplier |
| Reinforcement and connections | Installed work checked against approved details | Contractor and required inspector/designer |
| Under-slab services | Current layout and required trade checks | Relevant trade and inspector |
| Moisture and insulation layers | Product records, continuity and documented repairs | Enclosure/foundation team |
| Floor-specific details | Joints, drains, slopes, equipment and finish requirements | Foundation and interior designers |
| Release for placement | Applicable approvals and documented outstanding issues | Responsible project lead |
Write down who has authority to release the pour. An unanswered field question should be resolved by the relevant designer or authority, not by whichever crew happens to be waiting for the truck.
Plan placement, joints and curing as part of the work
The concrete proposal should identify responsibilities for placement conditions, finishing, joints, curing and protection. NRMCA's cracking guidance emphasizes stable support, appropriate jointing and proper curing; reinforcement does not eliminate all cracking. Ask the contractor to explain the project's acceptance and repair process in specific terms.
Keep curing, loading and drying decisions separate. Permission for one construction activity does not automatically mean the slab is ready for a moisture-sensitive floor covering. Schedule the flooring decision around actual test results and the selected products' requirements rather than a universal number of days after placement.
Ask how the slab will be protected while the building is erected and trades complete their work. Include cleanup and any surface preparation required by the final finish. If a polished or exposed concrete floor is intended, disclose that early so the concrete and interior scopes are coordinated.
Keep a foundation record for future work
Retain the approved drawings, revision history, required inspection records, material documentation and concealed-work photographs. Record actual changes before they are forgotten. Put any restrictions on drilling, cutting or adding loads in the handover package with the relevant designer's instructions.
Connect the foundation scope to post-frame or steel system selection, the utility site plan and the build timeline. For separate building stages, the shell and finish-out checklist helps assign these responsibilities before contractors hand work to one another.