Under my deck, I have had a problem with Robins (and perhaps other birds) building nests in the rafters. Personally, I don't mind it were it not for them getting very "protective" and accordingly getting very "swoopy." So, I decided to install bird spikes. It's an easy deterrent against birds as it simply makes the area in question undesirable. From what I found, it's about $30 for 10 lin. feet. Considering I needed around 30 feet of spikes, this is very pricey.
This Instructable is to show how to create a set of bird spikes. Note, if only a few spikes are needed, this might not be the best method. Nails through a strip of wood seems to be another common method and it does not require the purchase of a lot of fencing material.
Step 1: Gather materials
Gather the following materials:
Galvanized 2"x3" 16-gauge fencing material (I used vinyl coated galv.)
Roofing nails (galvanized, 1-1/4" should be fine)
Fence clipper or wire cutter
Needle-nose pliers (angled work best)
Work gloves (not necessary, but handy)
It's critical that the fencing material is made of a material that won't rust. Even if it's coated, the material should be galvanized steel or stainless-steel as cutting the material will break the coating. Also, it should be a minimum 16-gauge wire.