I'm planning to install 15x120mm paneling on the ceiling, but there's too long a gap between the rafters. The supplier recommends c/c 600, but mine is closer to 1200. I'm considering what happens if I glue a board to the back of the paneling to reinforce it.
Will the board become more stable against "sagging," or will it just take on more weight, resulting in the same outcome?
For example, 15mm paneling with a 20mm tongue and groove board glued behind it, not on all boards and not along the entire length, maybe 120cm paneling and 80cm tongue and groove on every fourth board.
Will the board become more stable against "sagging," or will it just take on more weight, resulting in the same outcome?
For example, 15mm paneling with a 20mm tongue and groove board glued behind it, not on all boards and not along the entire length, maybe 120cm paneling and 80cm tongue and groove on every fourth board.
try using a 25/35 läkt on edge.
Ceiling height?
Smart, it should be more stable on its edge, the question is whether it fits or becomes too thick... must check it out!Staffan2000 said:
The ceiling height is very low, and in large parts of the room, there is barely standing height, so I want to avoid any form of batten or sparse that builds downward.KnockOnWood said:
If you want to compare the properties of different dimensions, you can calculate their bending resistance using the formula b*h^3/12. If two boards are glued together, they can be considered as one board. The gluing slightly improves the bending resistance beyond the mathematical value. A 15x120 has a bending resistance of 3.375 cm4, while a 30x120 has a bending resistance of 27 cm4, which is a significant improvement. Whether this is sufficient in your case depends on the load, i.e., what will be on top of the panel.
Yes, there was indeed a significant difference in terms of numbers, so it will definitely be better to glue two boards together.
Can you put it into a more practical context so I can understand what the bending resistance means? For example, how much more weight can the board bear per meter before it bends?
The insulation is fixed between the rafters, so the panel will only bear its own weight, with nothing resting on it and pressing.
Can you put it into a more practical context so I can understand what the bending resistance means? For example, how much more weight can the board bear per meter before it bends?
The insulation is fixed between the rafters, so the panel will only bear its own weight, with nothing resting on it and pressing.
The most common use of the moment of inertia is when calculating deflection. It is not needed in this case. You can assume that tongue-and-groove boards with the combined measurement of 30x120 can handle the span of 1200 mm without any troublesome deflection. On top of roof trusses with this c/c, it is common to lay 23 mm thick raw boards.