When using dowels, select a size half the thickness of the wood being joined. For example, for 3/4-in. stock, consider 3/8-in. dowels.; for 7/8-in. stock use 7/16-in. dowels. The length inserted should generally be three times its thickness. Thus, a 3/8-in. dowel should be about 2-1/2 in. long to penetrate into each member 1-1/4 in.
A 15-year loan is usually made at a lower interest rate. Equity is built faster because early payments pay more principal. In a 30-year loan, more interest is paid off than principal for the first 23 years, meaning larger tax deductions. As inflation and costs of living increase, mortgage payments become a smaller part of overall expenses.