Hello , my question was in regards to the patio cover and square columns, not the house siding...thanks so much.
Sorry for the error Liliam- the columns are wood and the covered porch is
an extension of the main roof covering the patio. Alumawood is a fine product but it not used here. The ceiling is wood beadboard- What you can't see is the two sided fireplace, TV, nearby kegerator- this was one great outdoor space! Thanks for following up Liliam.