You can change the shape of the cornice of a house by secondary pouring of cement. Cement secondary pouring is a commonly used house decoration technology, which is suitable for changing the shape of cornice, repairing cornice damage or strengthening strength.

The steps of cement secondary pouring are as follows:

1. Preparation: Clean the dust, sundries and old cement blocks on the cornice surface. Ensure that the grass-roots level is flat, dry and free of grease and other pollutants.

2. base treatment: cement mortar or mending agent is used for base treatment, to fill depressions or repair cracks.

3. pouring concrete: according to the design requirements and construction standards, the concrete is mixed with an appropriate mixture ratio and poured to the cornice to make it closely connected with the surrounding walls.

4. Shaping and surface treatment: Use tools (such as trowel, brush, etc.) to shape and surface treat the poured concrete to meet the required modeling requirements. Auxiliary tools such as molds or plasterboards can be used to achieve specific decorative effects.

5. curing: properly curing the poured cement, keeping it moist and avoiding too fast drying, so as to ensure the strength and durability of concrete.

before the second cement pouring, it is recommended to consult a professional decoration master or designer to ensure that the operation method and construction quality meet the standards. In addition, according to the specific conditions and design requirements of the cornice, other materials and tools, such as steel reinforcement and waterproof treatment, may need to be involved to ensure the structural stability and waterproof performance of the cornice.