How to Avoid Common Framing Errors

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.

Improperly built field notches

If the field notches are made improperly, they may compromise the structural capacity of the framing member.

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