How do you fix a gap in gutters? 

Your gutters may just need to be rehung if they have begun to droop and separate from the house but are not in serious condition. The issue should be resolved by installing gutter spikes, ferrules, and strong gutter hangers correctly. A properly installed drip edge or flashing can be used to seal this space. 

If the gutters are seriously harmed, then it can be necessary to change the entire system to a more durable material or to replace individual portions.