We will begin to process the walls of an inexpensive summer house, which at the very beginning we decided to make from long -standing frames. They need to remove the former paint and treat the tree with an antiseptic, and paint. Then you can mount the walls. If there were not enough frames on all walls, then empty sections can be filled with OSB slabs. By the way, it would be nice to make one wall completely from OSB so that something can be hung on it in the house.