Simple things can make a big difference. This is
particularly true in the home construction industry. It is true that home
construction is not a technologically advanced field. We still use more or less
the same technologies that we used ten or twenty years ago. However, better
building materials are available now and they significantly improve the
structural stability and performance of the building.
Here is a quick overview of common framing mistakes
that can lead to callbacks and complaints:
Installing
sheathing as a single span: Sheathing needs to be installed over 2 or more
spans.
Installing
strength axis in the wrong dimension: It is generally a good idea to
install panels with their strength axis across the supports.
Sheathing
that isn't properly supported: If the wooden panels are cut less than 24
inches in width, they will probably deflect over a 24” panel. Since these
panels are usually installed on the roof ridges, workers may walk over them
during the construction. If the panels are narrower, you will have to support
them with edge support clips.
Installing
glued laminated timber upside down: These beams tend to be of the
unbalanced kind. Generally, different levels of bending stresses are assigned
to the tension and compression zones. If you find the label 'Top' on the top
lamination, you must ensure that that side of the timber goes up.
Panels that
are not properly spaced: When installing panels, make sure you space them
properly. Panels made of wood may expand or shrink when there is a difference
in the climate. When they are exposed to moisture, they may expand.
If panels are installed with hardly any space
between them, expansion will be prevented. This may lead to buckling. To
prevent buckling, there should be a gap of 1/8 inches between panel ends and
edge joints.
Fasteners
that are overdriven: Improper fastening will lead to aesthetic and
structural problems. They are the number one cause of call backs.
Inconsistent
joist spacing: Make sure that the deflection across the floor is
consistent. If not, expect a lot of call-backs from angry customers.
Inconsistent
floor gluing
Squeaking is one of the most common complaints
about wooden floors. If the floor system is properly glued and nailed there
will be no squeaking.
By following the five framing principles given
below you can prevent these common mistakes.
·
Wooden panels tend to have a strength direction.
If you adhere to this rule, you will be able to prevent most deflections.
·
Since wood has a tendency to expand or contract,
you need to ensure that the panels are properly spaced.
·
Make sure that your building practices are
consistent. Inconsistent materials, framing and alignment can cause a lot of
problems.
·
Most vapor related problems can be prevented by
using vapor retarders.
·
The builder or the contractor also needs to ensure
that the sheathing is continuous. Continuous sheathing will offer greater
resistance against high winds.
If the field notches are made improperly, they may
compromise the structural capacity of the framing member.
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