The dome roof is a 24 dome. This purple martin house is one of a kind and will be a beautiful sight on your property.It is made from western cedar and the floors are 3/4 exterior plywood. The dome is old barn tin and copper strips to give it a contrast look. Message me if you have any questions and thank you for looking. The item "Huge Hand Crafted Purple Martin Wooden Bird House Made In USA" is in sale since Sunday, April 15, 2018. This item is in the category "Home & Garden\Yard, Garden & Outdoor Living\Bird & Wildlife Accessories\Birdhouses". The seller is "grittscloset" and is located in Wylie, Texas. This item can't be shipped, the buyer must pick up the item.