If a railing is used as a decorative accent on the porch, it should be no higher than 5/8-inch or birds may become trapped underneath it. Add to Cart Purple Martin gourds in a convenient two-pack. It is best to securely mount the martin house on a pole and keep it from spinning around. Porches: Porches are not necessary on purple martin houses, but if they are used they should be 4 inches wide to allow birds to walk safely. Heath 30008: 2-piece Purple Martin Gourd Bird House - 8 Pack 30008 8999 Save 18 Shipping calculated at checkout. Purple martin birdhouses should be installed between 10’ and 14’ in the air.If using gourd purple martin houses, the interior height should be 8 inches to accommodate the unusual shape and upper tapering of the house. Interior height: The internal height of the house should range from 5 to 7 inches to provide enough space and ventilation for all the birds.Interior floor area: The minimum space of the interior floor should be 6 by 6 inches, though slightly larger homes are also suitable and may be more comfortable for large broods.A higher hole will be too difficult for parent birds to enter and exit while feeding young birds. A lower hole will not provide adequate protection from predators and weather, and young birds could more easily topple out of the opening. Entrance height: The entrance hole to the house should be 1 inch above the floor.Expand your Purple Martin house as your colony grows. Crescent-shaped holes can also be effective in preventing other birds from using the houses, but purple martins have no trouble with that unusual shape. Shop Heath Outdoor Products 4.25-in H Green Metal Purple Martins Nesting Box Bird House in the Bird Houses department at. Entrance holes measuring 2 1/8 inches are the most popular. Entrance hole: The diameter of the entrance hole should be between 1 3/4 and 2 1/4 inches.The Spruce Home Improvement Review Board.
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