You may be doing what I think you need to do, but I cannot tell from your description.Hi everyone,
I have a 40 inch by 1.5 inch piece of poplar, 3/8 inch thick.
I need to nail it on carpeting where the carpet meets hardwood floor. High traffic area.
Can I just shoot brads or should I use thicker finishing nails?
The piece of wood should be over the carpet AND over bare wood. A piece used as a threshold like that generally has a thick end that goes over the bare wood and a thinner end over the carpet. I do not see that a piece 3/8" thick would be sufficient for that.
The idea of this piece is to protect the carpet from wear. But while doing this it should also be unobtrusive. Go to a carpet store and see what they look like.