Banging sound

[Radian]

13 hours ago, Moggaman said:

Sounds like me… someone mentioned to me that the 11m long I beams I used should ideally be spliced for expansion… so my 11m long I beams go from gable to gable supported twice in between with concrete walls. They are mortared in at the ends … perhaps there is some tension / energy there?

The expansion coefficient for steel is around 9 x 10^-6 per  degree so 20 degree change in temperature for your 11m beam means it shrinks/grows by 2mm.

I think you are getting stick/slip noise noise from it.

[Moggaman]

4 hours ago, Radian said:

The expansion coefficient for steel is around 9 x 10^-6 per  degree so 20 degree change in temperature for your 11m beam means it shrinks/grows by 2mm.

I think you are getting stick/slip noise noise from it.

I presume it’s nothing to worry about if that was the case … just annoying ….heard it at lunch today downstairs!