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.
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
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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Bali Houses Special Feature page
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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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