I use cardboard wrapped in aluminum foil to cover my screen tops. Just cut a piece to fit, cutting out a hole for the heat lamp and a little extra room for air flow. Wrap it tightly in foil and tape the foil to the cardboard. Then simply lay it on top of the screen. The foil works well to reflect heat back into the enclosure and keep humidity in, while also preventing the cardboard from soaking up the moisture. The cardboard makes it sturdy and this should last you a while.
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