Replies

1. 
   _mj_ | Apr 17, 2020 02:58pm | #1

   I think you would be better served in the Fine Homebuilding forums.

2. 
   john_c2 | Apr 17, 2020 07:44pm | #2

   I would NOT, under any circumstances, mess with that structure without having a structural engineer look at it. Maybe an extremely experienced restoration carpenter, but not just anyone. Hire Joe Blow the handyman, and you could easily regret it.

3. 
   rob_ss | Apr 19, 2020 06:24am | #3

   I am not an engineer.
   However, my understanding of what you have shown is that ALL of it serves a purpose. None is just there for show or as temporary stays.

   The cross-pieces add significant rigidity and the long upright pieces are probably important for wind-resistance. Basically they are there to stop twisting and lifting under adverse wind conditions.

   I am certain that you could remove most of it, however you will need to come up with alternative means to stop your turret twisting, or even being blown off in the wind. The long tall pieces for instance almost certainly don't have to be done that way - you could consider using metal strapping which would tie the structure down and also increase torsional rigidity.

   Bracing calculations are complex without the right software and it would be cheaper and safer to pay an engineer to work out your solution. You may find that standards have been changed since the house was built too and an upgrade to bracing might have additional benefits. Otherwise you might find that not only are you chilly after a strong wind, your insurer may not pay up either! With stuff like this it always pays to have someone to sue if it all goes wrong. DIY at your peril...

4. 
   jake_w | Apr 19, 2020 09:11am | #4

   I am an engineer.
   I watched your video a couple of times and it looks like the cross bracing is irregular and poorly designed. Some is likely necessary. There are many problems in this space. There were few/no building standards when your home was constructed and it shows.

   I would recommend discussing your project with a construction/civil engineer who works in residential construction. There are many options to fix this space and they vary in cost. Most engineering cost are reasonable and having an onsite discussion will be worth the cost.

   Since you plan on replacing the roof, my recommendation would be to actually remove the entire turret and replace it with a truss structure. This would allow you many options and most truss manufacturers provide all the engineering services you would need. This would also allow you to restructure the walkway to be wider than 24 inches. This option may be more cost effective than you think.