The cost to replace the chimney crown or top is about $1,550 on average. The range varies widely depending on the size of the chimney, the materials used, accessibility, and the extent of the damage. If you suspect a problem with your chimney top, call a professional masonry contractor for an inspection. 

A standard drill will work just fine if you’re drilling small holes, and only a few of them. But anything with a diameter larger than 3/8 inch is best done with a hammer drill, since it is stronger, faster, and also makes your drill bits last longer. While you don’t absolutely need a hammer drill for stucco, it is a worthy investment if you think you might drill more holes down the road.

It’s not advisable to use CLR on stucco. CLR is a powerful acidic cleaner designed for removing tough mineral stains. Stucco is a porous material commonly made of cement, lime, and sand. The acidic nature of CLR can potentially damage or etch the stucco surface, leading to discoloration or deterioration. 

It is best to use cleaning solutions specifically formulated for stucco or mild household cleaners mixed with water to clean stucco siding. Always test any cleaning product in a small, inconspicuous area before applying it to the entire stucco surface.

Properly maintained stucco can enhance insulation, reducing energy loss.