This an indication of the larger absorption surface created by the screen. With a Vivaldi Screen™️, you will see the damp patch is no longer the size of the center hole, but is the same dimension as the Vivaldi Screen™️. The Vivaldi Screen™️ greatly increases the moisture absorption area and decreases the obstruction to the convecting air. (If you try this, you will see a damp or wet spot the size of the hole on the top side of the material but not the bottom.) This is where the Vivaldi Screen™️ helps. If the material is thick like a folded burlap sack, you see its lower side stays dry but its upper side is moist. Putting an absorbent material over the center hole restricts the air flow and captures the moisture, but not much because the hole has a small surface area.
If left unrestricted, the warm and moist air would hit the underside of the telescoping cover, often resulting in a black, wet and moldy panel on the underside of the telescoping cover, as in the image below. It is not it is more like a slow convection of warm and moist air that can easily flow essentially unrestricted up through the hole in the Vivaldi Board™️. If the colony is not particularly strong, it does not survive such sudden weather changes.Ĭonvection and Moisture: We often hear customers talk about air flow in a hive as if it were high volume. Too often, it results in an immediate bee kill and you see many bees dragged out in front of the hive when the weather warms enough for the bees to break cluster.
You can often see this in the moist Willamette Valley when there is a sudden cold snap in winter. Colonies can survive in cold weather if it is relatively dry, but moisture combined with cold weather kills a lot of hives every winter. Experience tells us it is the combination of cold and moisture that is hard on a colony, probably because moisture is a very good thermal conductor. In the last blog, we discussed hive ventilation, moisture and feeding as key factors in a healthy hive.
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