We finally decided to cover our ferrocement roof with anahaw palm leaves to absorb the heat from the sun. Our roof absorbs so much heat due to the El Nino that we feel like we are inside an oven sometimes. With the one layer anahaw leaves covering the entire roof and a temporary tarp covering the skylight because the polycarbonate started to leak a bit, the temperature indoors dropped nicely. Now we no longer feel much of the heat. We spent about thirty-five hundred php for the anahaw and nylon ropes to tie them up. A good price for something that keeps us cool all day. We recycled the old netting we had that covered the old thatch roof. This job took only less than fourteen days. Btw even with the tarp covering the skylight, we can still get a bit of light but not too much to heat up the inside.