Prepare support points from the house supplier’s foundation or installation drawing—not from a generic spacing rule. Ask for the exact support locations, required bearing capacity, and loads at each point, then have a qualified local professional check that the proposed foundation suits the soil, climate, and local building requirements. Before delivery, clear and survey the site, build the specified pads or other supports, and verify their positions and levels against the approved drawing. A nominal 40 ft length is 12.192 m, but the deployed footprint and support layout depend on the model.
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Support points transfer the house’s loads to the ground through the foundation system. Their position, elevation, and bearing surface can affect whether the structure is supported as intended during installation and use. The correct arrangement depends on the house design, its deployed configuration, the loads specified by the manufacturer, and site conditions.
A 40 ft expandable house may have a different footprint when opened than when transported. For that reason, do not lay out supports using transport dimensions or a generic container-house diagram unless the supplier confirms that it applies to your exact model. The installation drawing should identify the relevant support locations and any requirements for intermediate points.
Before excavation or concrete work, request the latest foundation layout and installation instructions for the specific model and configuration you are buying. Confirm the unit’s opening direction, final deployed dimensions, support-point coordinates, and whether the plan changes with optional equipment or layout choices. Ask the supplier to identify the design loads or reactions at the supports and any minimum bearing requirements.
Check that the drawings are suitable for your project location and foundation contractor. If the information is unclear, ask the supplier to explain it in writing rather than estimating the layout from product photos. The supplier’s information helps define the house requirements, while a local qualified professional can assess the site and determine whether the proposed foundation is suitable under applicable rules.
Confirm the planned house position, access route, working area, and final orientation before marking support points. Check for soft or disturbed ground, slopes, standing water, underground utilities, and any site restrictions that could affect excavation or installation. Arrange utility location checks where required before digging.
Ask the site professional to evaluate ground conditions and drainage. Soil strength can vary across a plot, and a visual inspection alone may not establish its capacity to carry the required loads. Where the site or project calls for it, obtain a geotechnical assessment and share the findings with the foundation designer and house supplier.
Choose a stable site datum and use the approved drawing to mark each support location. Dimensions should be taken from the same reference lines shown on the drawing, such as the stated building edge or centerline, to reduce cumulative measuring errors. Record the measured positions and compare them with the plan before construction begins.
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Use consistent units when reviewing the drawing and communicating with the contractor. For reference, 40 ft equals 12.192 m, and 1 ft equals 304.8 mm. These are unit conversions, not construction tolerances; use the dimensions and tolerances stated in the project documents rather than treating either conversion as an allowable placement error.
The approved design may call for concrete pads, piers, grade beams, or another foundation approach. The right option depends on the support reactions, soil conditions, frost or other local environmental considerations, and building requirements. Do not select a foundation type or size solely because it has been used for another 40 ft unit.
Have the contractor follow the project design for excavation, reinforcement, concrete, anchoring, and curing where applicable. Ensure that the top bearing surfaces are accessible for inspection and that drainage does not direct water toward the supports. If site conditions differ from the assumptions used in the design, pause and have the responsible professional review the change before proceeding.
After construction, measure the support locations and elevations and compare them with the supplier’s drawing and the foundation designer’s requirements. Record the results, note any deviations, and resolve them before the house arrives. A level or survey instrument may be used as appropriate, but the acceptance tolerance must come from the approved project documents.
Also confirm that access and setup space remain clear, and that the delivery and installation team can reach the planned position. Send the supplier or installer the requested site-preparation information, such as photos, measurements, or inspection records. Keep a copy of the approved drawing and the as-built measurements for the installation team.
| Decision | Information to confirm |
|---|---|
| Support layout | Exact point locations for the selected model and deployed configuration |
| Foundation design | Foundation type, dimensions, materials, and any anchoring details from the responsible designer |
| Ground capacity | Site-specific soil information and design bearing criteria, stated in the project’s chosen units |
| Level and position | Required construction tolerances and the method for checking them |
| Installation readiness | Access, setup space, utilities, drainage, and inspection or handover requirements |
Share the intended site location, ground information, preferred orientation, and project schedule with your supplier early. Ask which documents they can provide for foundation planning and what site information their installation team needs before dispatch. If the house includes options or changes to the standard layout, confirm whether those affect support positions or loads.
At Fulinkaitai, we can help buyers coordinate model-specific product information and clarify what should be confirmed for site preparation. Foundation design and approval should still be handled by the qualified professionals responsible for the project and local compliance. Request the relevant drawings and installation requirements before your contractor starts work.
To prepare support points for a 40 ft expandable house, obtain the correct model-specific layout and load information, assess the site, set out the points from the approved drawing, construct the specified foundation, and verify position and elevation before delivery. Do not rely on a universal support count, spacing, or pad size: these must be confirmed for the house and site. Your next step is to request the foundation documents from your supplier and have a qualified local professional review them alongside the site conditions.
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