Truss Uplift Remediation

Effective long term solutions

What is Truss Uplift?

  • Have you ever noticed a horizontal crack or separation form at the top of an interior wall where the wall meets the ceiling when the weather becomes cooler and dryer?
  • Have you ever noticed that your doors no longer seem to be aligned?
  • Have you noticed that your baseboard has lifted and no longer rests on the floor?
  • Have you ever noticed that your floor becomes unusually squeaky or pops when you walk on certain areas near a wall?

Many houses today are built using pre-fabricated roof trusses. Truss uplift occurs during the heating season when warm air from the home and cooler air in the upper attic create a moisture difference that causes the roof trusses to crown. The top of the trusses expand while the bottom of the trusses pulls up. As the truss moves upwards it takes the drywall ceiling with it. If the interior walls are attached more securely to the roof trusses than to the floor, the truss will lift the entire wall, making baseboard trim no longer meet the floor, causing doors to no longer open & close properly and floors to creak and pop when you walk on them.

Truss uplift is caused when the builder nails the roof trusses directly to the interior walls, or when the drywall strapping has been directly nailed or screwed to the trusses within 16 inches of an interior wall.

Truss uplift in an existing home can be resolved using a variety of methods. Some methods are more effective than others.

We have a “top down approach” to truss uplift remediation. The most effective method involves going up into the attic during the cooler seasons, from late fall to early spring and resolving the problem at its source. After truss uplift has been resolved at source, cosmetic repairs to the affected interior areas including drywall, doors and floors can be remedied. Without correcting truss uplift at its source there is substantial risk of re-occurrence.

It is important to note that no alterations are made to the engineered trusses. Changes are only made to the way in which the trusses are attached to the interior walls.

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