If the top beam sags, will the sliding stacking system still work?

Depending on the amount of sag, the systems will still operate. The Paragon will allow for 7 mm sag, while the Clearview allows a 3mm sag. However, we recommend that the Paragon system is installed with a compensating channel which will allow a further 15mm sag on a beam when reset.  This is especially applicable on newly build houses and renovations.