I’m going to build a ceiling over a room inside another, much larger room (it will become a music studio). The ceiling will be about 5.4m x 8.7m (total approximately 47m2). I’m now wondering what type of bearer and rafters I should use for the ceiling to avoid it falling on my head in the future. The ceiling needs to support 70mm insulation and three layers of 13mm drywall. It should also hold about 200kg of sound-absorbing installations. Since the room should not have any contact with the house's frame, I cannot attach anything to the existing ceiling.
No idea how small a dimension you can choose, but if you KNOW that the top side will not become the floor, you can use 45x220. (But you must build the other way.)
I was tipped to splice 45x145 by doubling them and offsetting one beam by about a meter, then gluing/screwing and bolting them together at the joints. Opinions?
Are you aiming for the minimum possible construction height or do you have high ceilings now?
If you use the beam you describe, it will be incredibly large with a span of 8.7m.
Of course, you would place it in the other direction.
If you even need a beam at all.
I guess you can't attach the roof to the walls either and will need to build new freestanding walls separate from the existing ones?
45x220 (or glulam 56x225) is probably sufficient, especially if you are going to frame new walls since the span will be reduced.
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