I agree with the other comments about making sure he doesn't have a medical problem and looking at dominance issues. You also might want to consider dog diapers.
I have an older male dog with canine dementia. He sometimes tries to pee in the house where he shouldn't. When we moved to a new house with lots of carpet, we bought him "bellybands" online. Look up "Happy Jack Dog Diapers". They're made of fleece with a velcro fastener and a shoulder strap to keep him from "slithering" out of them. We line them with inexpensive sanitary pads and have several of them so we can wash them as needed. He doesn't mind them at all and they work perfectly. They also look like they'd be easy to make if you wanted to make your own. Good luck solving the problem! Let us know how you do...