Structural calculations
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The Counties in the USA now require that not only detailed drawings shall be submitted but that also a structural calculation shall accomplish the set of documents as to apply for a building license of a dwelling of any size which has been prefabricated outside the USA. While some Counties on the main land may be lenient as to the requirement of such structural calculation, all Hawaiian Counties strictly adhere to this regulation. Our company is able to produce the calculation in compliance with the latest USA codes (IBC 2009) including the amendments which may differ from County to County.

Our structural calculations are prepared with STAAD PRO v8i, a state-of-the-art finite element computer program, fully recognized an accepted by all Counties in the USA. The structural reports that we submit are based on the results of the computer calculation and include the analyses for maximum allowable deflections, displacements, forces and stresses in accordance with ASCE, ACI, AASHTO, AITC or any other USA code. Our reports are very detailed and are normally approved by the building authorities without a hick.

The calculations for our wooden house structures may be extended with a calculation for the foundation.

All our structural calculations are backed up and reviewed by a prominent Professor of the University of Hawaii. For the USA all structural calculations and drawings require to be rubber stamped  by a USA registered architect or engineer. We have access to these sources. Any USA County will only consider to review an application for a building license if the set of documents is complete (detailed drawings + structural calculation) and be rubber stamped.  

A new and upcoming trend is that also the Caribbean and Pacific islands will require a structural calculation for a wooden prefab house. This is mainly based on the effect of global warming, whereas hurricanes and typhoons will occur more frequently in the coming decennium and will strike with much higher wind forces.

The costs for the preparation of a structural calculation is not included in the price for the house, since any client may engage a local engineer. We would be happy to submit a quotation for the structural design.  

In conclusion: We strongly advise you to contact your local Building Authority as to find out whether an imported wooden prefab house shall comply with the local building codes and requirements and/or comply with special import regulations. If such is indeed the case you may need to ask the following questions.

1. Would it be acceptable if the wooden prefab house complies with the IBC 2009 (USA International Building Code 2009). If the answer is affirmative we will be able to supply, however, if the answer is negative whereas the house shall comply with the local building codes we may not be able to supply unless you will engage a local engineer to cooperate with us.

2. Are there restrictions to the use of particular hardwoods originated from Indonesia. If the answer is yes you need to find out which wood species are prohibited.

3. Shall the wood be FSC Certified. If the answer is yes, you will not be able to import any wooden house from Indonesia, since not one supplier in Indonesia has an FSC Certificate in place with a chain of custody to the first supplier; the felling concession.

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Below is shown an example of how we prepare our calculations



Computer input model


Computer input for truss load 


Sample page of analysis

Click on a picture for an enlargement


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Last modified: November 03, 2013
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