I’m not sure how you were trying to set it up, but the Press’nSeal isn’t at all structural. I only use it to cover a threadbare towel that I put over the pad to help keep it clean. If you want the pad on the underside of the frame, you use small bungee cords to secure it. Here is a link to some clear instructions and photos on the Mama Heating Pad thread, courtesy of
@Beekissed. Her posts start about halfway down the page.
https://www.backyardchickens.com/th...e-brooder-picture-heavy-update.956958/page-46
As for it not getting warm enough with the pad on the top of the frame, I can tell you that the temperatures on the floor of the “cave” average between 82.5 degrees and 85. You won’t get that recommended “95 the first week, 90 the second, etc.” using MHP, nor should you. It works by warming the chicks directly, not by heating the entire area. If your chicks are happily running in and out, resting on top of or beside it, and wandering under for a nap or when the sun goes down, it’s perfect. The heat needs to be at the level of the chicks’ backs. I raise them outside in a wire brooder in our covered run when our springtime temps are still in the 20s, dipping into the teens sometimes, with sideways blowing snow. Simple adjustments to the height of the cave as they grow, and turning the heat a notch if they don’t seem to want to use it anymore are about all that’s needed. I hope that helps.