Tier-on-tier style shutters allow the top shutters to be folded back while the lower tier remain in place. This style is very suited to rooms which face northwards and therefore tend to be quite dark. The lower shutter panels can remain closed over for privacy while the top panels can be opened back to allow maximum light enter the room. While they might be slightly harder to install, the functionality of this style is well worth the extra effort. As with the mid rail in the full height style, the split point (where top tier meets bottom tier) should align with any rail or divider in your window.Tier-on-tier style shutters are more suited to narrower windows where panels tend to be smaller. Because the top panels are regularly folded back, we recommend opting for smaller bi-folding panels which will not protrude out too far into the room.