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We built in 2008 a traditional brick and frame house. My problem is the deflection of the transversal load-bearing beam of the frame (supporting the floor). Length of 8.40 m fir tree... sag of + 5 cm in the middle. Is this normal, knowing that now I observe false levels of the floor on the floor and ceiling curved bottom... Should not it be laminated for this length?

The chart charts for the wooden beams mostly stop at 6 m in length,. It can be deduced that beyond that requires another material. A 5 cm sag in the middle of a load beam is not normal. The house is less than 10 years old, you must play your property damage insurance and, if you have not subscribed (which would be wrong), involve the manufacturer under the ten-year guarantee.
Several solutions are possible, including that of adding to the ground floor when possible, a pole at mid-span of the beam, and hidden in an existing partition. This beam can also be doubled by a metal section, by a composite beam wood / steel, by one glued laminated beam, etc.An expertise will give the solution.

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