ᐅ Structural concerns for playhouse – damaged finger-jointed timber?

Dear Forum,

I hope you can help me. We have just built, or partially had built, a playhouse. Safety is very important to me, so I insisted on using six 12x12 posts (inches) even though the builder thought that was excessive (the playhouse measures 3x2 meters (10x6.5 feet) and weighs about 300 kilograms (660 pounds)). Now that I want to start the protective coating, I noticed some unusual notches that don’t look quite right to me on the 2-meter (6.5 feet) span. The lower framework was entirely built and supplied by a professional. I then searched for these notches online and have serious concerns that our crossbeam might be damaged and that this could weaken the structure’s load-bearing capacity. I hope you can reassure me—I thought I had over-dimensioned everything structurally, and now this. The first picture shows the area, followed by two images of the stamp on the beam, which I do not recognize except that it seems to be a CE mark. Then there is the possibly damaged spot from the inside and finally the playhouse itself.

Thanks for any assessments or advice!

All good, the craftsman built it solidly and securely.

The substructure is very solid.

The roof structure seems questionable. Is there a central purlin?

Could you please provide a picture from the front?

The wedge joint is permissible and structurally sound for Nsi (not visible) areas, and from a structural perspective, it poses no concerns. A misalignment or chamfer of 3 or 4 mm (about 0.1 or 0.15 inches) is common with KVH (machine-graded structural timber).

Also, a 12 cm by 12 cm (approximately 5 inches by 5 inches) beam over 2 meters (about 6.5 feet) can support a live load of 700 kg (approximately 1,540 lbs) each, even if it fluctuates, without any issues. So, placing a covered Jacuzzi is perfectly feasible.

Totally forgot: I would extend the tongue-and-groove cladding one row further down, also underneath the terrace. Otherwise, all the beam ends are fully exposed to the weather, and the cladding might even drip directly onto them.