It depends. It is possible to put shade sails on the exterior of a house. However, this will depend on the material and structure of the house. The mounting point ought to be strong enough to withstand the pressures caused by wind without causing any damage to your home. Mounting shade sails on materials such as gutters, siding, or stucco is NOT a good idea. The mounting of shade sails can be accomplished with a variety of materials, including brick, concrete, and cement blocks.