S.B.
Hi C.
Here is my input.
Is he neutered? Many intact male dogs will lift their legs in the house to mark their territory. Having him neutered may help with this.
You can purchase a product called a Belly Band. It is a soft fabric that you can put on your dogs midsection which will prevent him from being able to mark, and if he does try to the material acts as a diaper and absorbs the pee, saving your furniture. While this is not a real solution to the problem, it will help with damage control. They are often made by individuals and can come in any sort of material. I had a jungle pattern one and a flame pattern one. They have velcro along one side to help you adjust it to your dog. They are machine washable.
The last bit of advice I can offer is that if you are home, he needs to be on a leash attached to you. If you wear a belt you can put the loop of the leash through your belt and still have your hands free. That way you are right there and can catch him in the act. If you catch him trying to mark in the house you can give a quick pop on the leash with a "No Potty!" and get him outside right away, be sure to praise praise praise him when he does potty outside.
I do not believe that putting him in a crate for 14 days will solve this problem. You need to be able to train him and the only way you can do that is if you catch him during the bad behavior. I do agree with many others that you should NOT rub his nose in it.
I have owned dogs for 11 years and put many titles on them, I have also experienced a dominant male marking in the house and the above was what worked for me.
Good luck! :)