Take money out of your IRA? That is an option that, I assure you, will not be popular on this forum. The Roth IRA offers huge tax advantages, and the moment you take dollars out of it to fund repairs (that, I note, would fund a sizeable downpayment on a reasonably priced home) you're taking a step down a very slippery financial path.
Might I ask what repairs you are considering doing that cost $50,000? Furthermore, why are you living in a house worth $850k? Surely it would be financially wise to downsize--a lot--buy a place outright, and pocket the difference?
If you want to leverage the sale of your house by financing the repairs, that is a legitimate business strategy, and could be a very wise financial decision. But I don't suspect you'll find the idea of loving in an $850k house very popular on this site, unless you can truly afford it or aren't able to move for some reason.