I've got two large chimneys. They're each about 62" x 26". I had a chimney sweep over not long ago to remove a dead squirrel from one of them. That chimney has a slate cap stacked on top of two bricks on each corner. The chimney sweep suggested replacing the one cap and mounting a new copper cap on both chimneys. My concerns are that the house is near the ocean, where it often gets a strong NE wind. Should I go with a stainless cap instead of the copper since it's sturdier? Copper was suggested for aesthetics (patina) since our roof is copper and slate. Will the copper flex and/or eventually break or fly off? Also, the sweep says that only a 41" x 17" cap is needed for the 62" x 26" since the chimney's only got one flue that doesn't span to the edges. The estimate for one cap and install is $515. Thoughts? Any help appreciated.

Thanks,

Paul