1/2 in. x 4 ft. x 25 ft. 19-Gauge Steel Hardware Cloth

Yes it is 1/2" holes are very sturdy. Should work.

Gotta be after.

How would you use it? If the pigeons sit on the mesh covering, their droppings will go right through it. If you shape and form it so the pigeons can't perch on the mesh (cone-shaped, etc..), then I think it would work.

No. I purchased it to be used as the field for large poster size frames. The screen serves as a way to clothes pin to the frame, those many crayon works of art brought home by my grandchildren. This allows me to easily trade it out and keep it current. Plus it provides more space to display, than the refrigerator doors.

We’ve live in a dryer climate and had it installed for a year however it is exposed in areas to sprinklers and had no rusting to date.

Was the best wire I found to build a bird cage for my daughter’s bird cage

Yes we tacked some to the inside of the attic roof vents so it is not visible from the outside and it keeps squirrels and bird out too.

I don't know and couldn't find anything on the site about it but I did find a phone number for you to call with questions: (800) 628-8815 I hope this helps.

I just use a fine flat file.

Stuff a 2x4 under the bottom railing and fasten it to the railing. shim if necessary for any small gap. The width of the 2x4 should go under no problem. Use wire or zip ties to secure the 2x4 to the bottom railing. Then staple your hardware cloth to the 2x4. Make sure the 2x4 is sitting on it's edge on the concrete. Good luck