Yes, you can use your Ordinary Account savings, including any withdrawable amounts, to pay for your housing loan.
You can view your
Home ownership dashboard to check the savings you can use for your housing payments under the "Amount allowed for this property" section. This will give you a clear idea of how much more you can use before reaching the usage limits.
While you use your CPF savings for housing, it is also important to consider the impact on your retirement savings and ensure that you have enough for your retirement needs.