mittenbp.com
Unacceptable Heat Limit and Unresponsive Support Made This a Poor Experience
I had Mitten siding installed on my house, and unfortunately encountered a serious issue: the siding warped due to direct glare from my neighbor’s windows reflecting sunlight, creating localized hotspots. When I reached out to Mitten, they stated their siding cannot tolerate sustained temperatures above 160°F, and that such conditions were excluded from warranty coverage.
That’s surprisingly low. While exact thresholds aren’t always disclosed publicly, vinyl siding typically expands and warps under intense heat or reflected sunlight—and it's common industry guidance to avoid such exposure to prevent distortion—but it's unusual for a manufacturer to draw a line at just 160°F, which seems lower than what most durable siding products claim to withstand reliably.
When I contacted my contractor about mitigation options, he generously offered to buy new siding himself, because Mitten refused to cover it. Then I asked Mitten if they'd at least assist with the cost of installing glare-reducing screens or applying film to the neighbor’s windows—but they just pointed me back to the warranty policy and declined any help or reimbursement for these solutions.
It’s deeply disappointing. Siding is meant to be a long-term investment that stands up to the elements and occasional indirect heat sources—it shouldn’t fail under circumstances that fall reasonably outside normal use. Mitten’s unwillingness to support or help find a practical fix felt dismissive, and their rigid threshold policy seems inadequate compared to industry norms.
