How to level old bowed wood floor before putting down engineered wood floor?

want put down new engineered wood floor on top of old wood floor. problem in 1 larger room old floor bowed , needs levelling: difference between middle of floor , edges as 2cm. pulling old boards not solution, problem originates beams (it's top floor of victorian house). best way level floor?

i want put down new engineered wood floor on top of old wood floor. problem in 1 larger room old floor bowed , needs levelling: difference between middle of floor , edges as 2cm. pulling old boards not solution, problem originates with...

Home & Garden Decorating & Remodeling Next