Criteria for investment mortgage
Generally, if you wish to purchase a property abroad and obtain an Irish mortgage to do so, you need to use an Irish property as collateral and release some equity from it to purchase the overseas property.
That way, assuming that you have enough equity in the Irish property you may borrow as much of the purchase price of the overseas property as you wish.
Otherwise you need to look at lenders in the country where you want to buy the foreign property if you wish to use it as collateral.
I don't know of any Irish lenders who will take an overseas property as collateral apart from ones from the UK.
Dev