I got tired of rebuilding pine birdhouses every few years as they rotted out and I also read that PT pine isn’t safe for the birds (not sure about that, but I will ere on the side of caution) so I investigated using Trex lumber. Usually reserved for decks, this material is weather and rot resistant and would seem to me to be an ideal material to build a bird house.
I selected a nice brown color Trex board. I was a bit worried about a darker color overheating the chicks inside, but I plan to hang this in relatively deep shade in a grove of big white pine trees. First step was to measure out the pieces. You can make two birdhouses from a single board. There is a plethora of websites that will explain the exact dimensions and size of the hole for attracting specific birds, so I won’t go into that. Since I am trying to attract Nuthatches, this particular birdhouse will have 8” sides, a 10” top (for some overhang rain protection) a 14” back (to make space for a hanging hole), and the floor is 4.5”.
After cutting all the boards, I next started to work on the entrance hole. Nuthatches like a hole exactly 1.25” in diameter and it should be about 6” from the floor. I carefully measured and centered before cutting. I selected a spade bit for the hole. Be prepared for the Trex board to cut in huge ribbons unlike wood.
I also opted for a copper “Predator Guard” as I a squirrel had completely chewed through my last Trex birdhouse that didn’t have this extra protection. Lastly, I used a hot melt glue gun to make some baby bird “foot hold” the inside. I read somewhere that if it is too slippery the baby birds will not be able to climb out. I figure this will give them some needed traction. I know it seems like I know a lot about birds, but trust me I’m not who you should ask about bird cage covers or anything else bird related, I just really like wood bird houses.
I also drilled some drainage holes in the floor (important!).I predrilled all the holes and began assembly with 2.5” galvanized screws.
Net result was very good. I did get a family of Nuthatches to move in (seem to have a pair every year in this same spot) and the house has held up very well to the weather and squirrel attacks.