Should I put a slate on the window to seal the sun?

1. Cement and sand are mixed evenly according to a certain proportion, and a small amount of water is added. It is better to rub it into a ball in your hand, commonly known as dry mortar. 2. Spread the dry mortar evenly, pat the pebbles one by one after the dry mortar is properly leveled with wooden boards, and ask the pebbles to buy mortar 1/3 before flattening the pebbles with small wooden boards. 3. After leveling, sprinkle all the cement powder evenly on the pebbles, and then spray water with a sprayer until all the cement powder on the pebbles is washed clean. The cobblestones paved according to the above methods are dense, neat and clean, and will not fall off in the future. Because the residual water of cement powder scattered on pebbles is washed away, it all flows into the cracks of pebbles, forming cement slurry, which is very smooth after solidification. It not only stabilizes the pebbles again, but also facilitates cleaning and washing in the future.