I build my martin houses from sheet metal, 6" PVC pipe, plastic funnels, and red cedar. Nothing will rot or decay. The funnels are insulated with fiber glass and the sheet metal roof is insulated with factor one insulation. I recommend mounting a single house on 1 1/2" ID black iron pipe.
Cost of one 14 unit house: $60 UPS Shipping: $20
Endorsement from John Massa of Mulberry, Kansas "Last year about the middle of May I bought one of Chet's houses. Chet told me that it was too late to get martins that year. The very next morning purple martins left a metal house of my brother's about three blocks away and nested in my new house. They like Chet's house and so do I."
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