Soundproof Ceiling
I was here asking about this a year ago. Then the money went to one of the children. Now I'm making a new attempt and need some advice.
Old apartment building, built in 1935, wooden beams. One room measures 360 x 375.
First thought was to use acoustic profiles on steel studs, more than 5 times as expensive as wood and a lot of waste so that went away.
45x45 studs instead. Can you "hang" 45x45 studs in metal strips/perforated tape
(distance to the ceiling 5 or 10mm) screw every 300cc (screw size?, nylon plug?). Distance between the studs (600cc)?. Insulation mat between the studs. Next, crossed 45 studs with 300cc spacing (also attached with perforated tape to the above stud). Double 13 gypsum (distance to the wall 8-10mm) sealed against the wall with acoustic sealant. Does this seem reasonable?
Will the perforated tape hold the load (especially if bent 90 degrees against the ceiling for fastening)?
Correct dimension for screw? Plug? (for mounting against the beams)
Replace perforated tape with tension straps (nylon 400kg) for a better sound barrier
Other solution?
I was here asking about this a year ago. Then the money went to one of the children. Now I'm making a new attempt and need some advice.
Old apartment building, built in 1935, wooden beams. One room measures 360 x 375.
First thought was to use acoustic profiles on steel studs, more than 5 times as expensive as wood and a lot of waste so that went away.
45x45 studs instead. Can you "hang" 45x45 studs in metal strips/perforated tape
(distance to the ceiling 5 or 10mm) screw every 300cc (screw size?, nylon plug?). Distance between the studs (600cc)?. Insulation mat between the studs. Next, crossed 45 studs with 300cc spacing (also attached with perforated tape to the above stud). Double 13 gypsum (distance to the wall 8-10mm) sealed against the wall with acoustic sealant. Does this seem reasonable?
Will the perforated tape hold the load (especially if bent 90 degrees against the ceiling for fastening)?
Correct dimension for screw? Plug? (for mounting against the beams)
Replace perforated tape with tension straps (nylon 400kg) for a better sound barrier
Other solution?
Thank you so much for the response.
Just as I thought, the mounting to the ceiling is my big problem. Where I encounter the beam, maybe I can use wood screws (100mm?).
In the rest of the ceiling structure, it seems to be plaster and then wooden planks, which makes me doubtful about chemical anchors (could I be wrong?).
Do drywall anchors work in the right dimension? (Byggmax, 2 kr each)
Regarding your calculation, I'm missing a factor.
Does anyone know what 45x45 weighs per linear meter?
Just as I thought, the mounting to the ceiling is my big problem. Where I encounter the beam, maybe I can use wood screws (100mm?).
In the rest of the ceiling structure, it seems to be plaster and then wooden planks, which makes me doubtful about chemical anchors (could I be wrong?).
Do drywall anchors work in the right dimension? (Byggmax, 2 kr each)
Regarding your calculation, I'm missing a factor.
Does anyone know what 45x45 weighs per linear meter?
Wood weighs around 700 kg/cubic meter, so somewhere around 3 kilos per meter... then you could discuss how good a 45*45 construction is in a roof, but that's another story... The metal straps work perfectly and you attach them with longer wood screws. A ceiling of your type weighs with one layer of plaster about 20 kilos per square meter and with two layers about 30 kilos per square meter. Normally, in a suspended ceiling construction, hangers are placed at 120 cm centers and 60 cm from the wall... But then you use a primary suspension. However, in your case, you will need to suspend each beam, which means your ceiling will be incredibly over-dimensioned as a whole.
Regarding waste, a hat profile is 3.6 m, so I don't understand where the waste comes from... They are also available in 4-meter lengths. If they were 3 meters, the waste would also be minimal, but well...
The suspension needs to be done at, say, 500 or 600 CC 300 is overkill to the extreme...
Then you can always discuss the usefulness of a ceiling dropped a total of 7 cm.... Which is the main discussion versus what type of fastening you have..... When we talk about sound....
Regarding waste, a hat profile is 3.6 m, so I don't understand where the waste comes from... They are also available in 4-meter lengths. If they were 3 meters, the waste would also be minimal, but well...
The suspension needs to be done at, say, 500 or 600 CC 300 is overkill to the extreme...
Then you can always discuss the usefulness of a ceiling dropped a total of 7 cm.... Which is the main discussion versus what type of fastening you have..... When we talk about sound....
Hello Mr Z
I received a lot of good advice from you a year ago, so thanks for last time.
Hat profiles and primary profiles are 3.6 m (or longer). I can never get them up the spiral staircase 2 floors without cutting and then they need to be joined 200cc. The room dimensions are 360 x 375, but sure 4 m rule, cut "on the street". The price I have is a little over 20 SEK per meter for steel profiles. Rough-sawn 45x45 at Byggmax is 5:95 SEK. I have two rooms, of which 360x375 is the smaller one, we’re talking at least 145 m rule (primary 600cc, secondary 300cc) times 5:95 or 20 SEK, gives a slightly different total price.
As said, I sacrificed the ceiling budget for the kids. Now I'm back at it, slightly poorer.
not 7 cm – counting on 45 + 45 + suspension (hole band against the ceiling and between the 45s) and should end up at 10 cm.
Since I'm a bit nervous about the durability of the attachment in my "tarpaper roof" ;-) I might consider hat profiles on the wall against secondary 45.
Is it completely crazy to use 45 rough-sawn against the wall as a "hat profile" instead, (same distance as the secondary profiles) but for attaching the drywall around the walls. (10cc from wall + acoustic compound)
If I find the beams at 1200 cc distance and use (100 cc?) wood screws, then maybe I would dare to use 600cc between the suspensions, But then it's important that I start with primary across the beam. Is there any clever way to "find" the beams?
With 3 kg for 45 rough-sawn + double drywall, I end up at 45 kg per square meter. 600cc feels a bit uncertain. In my head, I get more than 12 kg per attachment.
Question: why is 45 rough-sawn so poor compared to steel rule?
P.S I will of course fill 45 + 45 with 45 proffssheet between the rules.
I received a lot of good advice from you a year ago, so thanks for last time.
Hat profiles and primary profiles are 3.6 m (or longer). I can never get them up the spiral staircase 2 floors without cutting and then they need to be joined 200cc. The room dimensions are 360 x 375, but sure 4 m rule, cut "on the street". The price I have is a little over 20 SEK per meter for steel profiles. Rough-sawn 45x45 at Byggmax is 5:95 SEK. I have two rooms, of which 360x375 is the smaller one, we’re talking at least 145 m rule (primary 600cc, secondary 300cc) times 5:95 or 20 SEK, gives a slightly different total price.
As said, I sacrificed the ceiling budget for the kids. Now I'm back at it, slightly poorer.
not 7 cm – counting on 45 + 45 + suspension (hole band against the ceiling and between the 45s) and should end up at 10 cm.
Since I'm a bit nervous about the durability of the attachment in my "tarpaper roof" ;-) I might consider hat profiles on the wall against secondary 45.
Is it completely crazy to use 45 rough-sawn against the wall as a "hat profile" instead, (same distance as the secondary profiles) but for attaching the drywall around the walls. (10cc from wall + acoustic compound)
If I find the beams at 1200 cc distance and use (100 cc?) wood screws, then maybe I would dare to use 600cc between the suspensions, But then it's important that I start with primary across the beam. Is there any clever way to "find" the beams?
With 3 kg for 45 rough-sawn + double drywall, I end up at 45 kg per square meter. 600cc feels a bit uncertain. In my head, I get more than 12 kg per attachment.
Question: why is 45 rough-sawn so poor compared to steel rule?
P.S I will of course fill 45 + 45 with 45 proffssheet between the rules.
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