Originally Posted by psneeld
I would also core out where the bolts screws went to a solid plug for water tightness and compressibility...
and glass or fill over top of the bolt screw heads so water could NEVER enter. Both heads with fender washers is just asking for trouble as the slightest movement breaks the sealant joints.
Agree with psneeld re: plug for cored FG -
- that's what I've always seen as recommended best practice... Many reasons - compression, movement, water intrusion.
Counter sinking top of hole (under backing plate or washer) also a best practice
I'd prefer cleaner looking attachment - if bolting why not head on roof top and use a threaded insert in the beam or counter bore from bottom and sink a washer & nut on the bottom - then cover w/ a plug - visible bottom ends up neat & clean and roof top cleaner as well.