[DCBryan1]

Will concrete cinder blocks filled with quickcrete and reinforced with number 4 steel rebar be sufficient?

[JRandomFreeper]

Probably not for an F-5. I think it's Texas A&M that has all the information of types of construction vs size of hurricane or tornado. You could probably find the information on their web site, including construction specifications.

Turns out one big thing is simple and cheap roof clips to keep the roof tied to the walls.

/johnny

[driftdiver]

Better then plain cinder blocks but I don’t think they are as good as solid concrete with rebar inside.

They do use your method here in florida for hurricanes but those aren’t as strong as tornadoes like this one.