Most inner covers have a 3/8" gap on one side and a 1/8" gap or not gap on the other side. They actually seem to vary a lot. You have to check the space from the top bars to the top to see how you beespace comes out there. Typically the frame rest rabbet is 5/8" deep and that leaves 1/4" beespace (minimum beespace) on top. But with a frame spacer or a frame rests this can get reduced to nothing or 1/8" which is NOT a beespace. I do worry more about the beespace on the top of the bars, but the ideal situation is a beespace on the top of the bars (between not less than 1/4" and no more than 3/8") and a beespace on top of the inner cover so that the bees can patrol the top of the inner cover and chase out ants and roaches etc. Since I screen the openings on my inner covers and do a vent box on top, I have to keep an eye on them because I have had an ant colony move into the inner cover. I've also, when I use plastic screen for the vents, had hornets and paper wasps eat through the plastic screen and build nests in the vent box. But the up side (besides the ventilation) is I don't worry about the beespace on top, just on the bottom. If you get the beespace off on the top bars, they will either fill the it with comb (too large) or propolize the top bars to the inner cover (too small). If you have either of these problems then you need to examine the beespace there. Popsicle sticks can be used to make adjustments and allow some ventilation, but they will propolize the gap this leaves eventually.