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0438 Roof Truss Uplift - Roof Framing - Trusses
 
0438 Roof Truss Uplift - Roof Framing - Trusses -

Image Text: Cross section > roof truss > insulation > expansion - colder, "wetter" wood > shrinkage - warmer, "drier" wood > truss lifts upwards in middle > insulation omitted for clarity > cracks form at central wall/ceiling intersections

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