Lets compare Rock Flex chimney liner to the Flex King Pro chimney liner and see which chimney liner is the best fit for you and your budget.

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Rock Flex Chimney Liners

Rock Flex Chimney Liner – Pros

A Rock Flex chimney liner is made of 316Ti metal alloy good for all purpose burning. Rock Flex chimney liner has a thickness of 0.006 inches.

Rock Flex Chimney Liner – Cons

A Rock Flex chimney is not a new brand of chimney liner, but it is just a Forever Flex chimney liner renamed. So all the cons that a Forever Flex chimney liner has a Rock Flex chimney liner possesses. As for the UL listing, the actual product line “Rock Flex” is not UL listed but rather Forever Flex chimney liner is the product that has the UL certification. The Forever Flex “Sweep Install Only” warranty allows only a certified chimney sweep to install your Rock Flex chimney liner or else your Rock Flex chimney liner warranty will be voided. Also the over all quality of a Rock Flex chimney liner is subpar due to low crush point and the lack of overall thickness of the Rock Flex chimney liner. The interior of a Rock Flex chimney liner is of concern with its corrugated interior, deadly creosote will buildup inside your Rock Flex chimney liner and could lead to a chimney fire.

The final con against a Rock Flex chimney liner is the fact that a distributor is selling it. This means that you are not getting the lowest price possible on your chimney liner. Also do you want to deal with a company that is trying to dupe their customers by selling them a Forever Flex chimney liner under the name of Rock Flex chimney liner?

Flex King Pro Chimney Liner

Flex King Pro Chimney Liner – Pros

The Flex King Pro chimney liner is the highest quality DIY (Do It Yourself) liner on the market today. It is over twice the thickness of a Rock Flex chimney liner at a total thickness of 0.014 inches. The Flex King Pro chimney liner is made of 2 layers of 316Ti metal alloy which gives the Flex King Pro a much higher crush point then a Rock Flex chimney liner. The best part about the Flex King Pro chimney liner is that it comes with a lifetime DIY warranty which states that a certified chimney sweep does NOT have to install it , but rather a DIY homeowner can install it themselves. The Flex King Pro is also UL listed and is sold directly from the manufacturer to you. This means if you ever have any questions or concerns, customer service is just a phone call away. Because the Flex King Pro is a factory direct chimney liner, the prices on both a Flex King chimney liner by itself and a Flex King Pro chimney liner kit are the lowest around.

The smooth wall interior of the Flex King Pro chimney liner gives it some great advantages over Rock Flex chimney liner. These advantages are 20% increase in chimney draft with allows for more efficient burning and a 25% decrease in creosote buildup in the chimney liner. The Flex King Pro is the only smooth wall interior DIY chimney liner that is sold directly to homeowners.

Flex King Pro Chimney Liner – Cons

None

Conclusion: Winner – Flex King Pro Chimney Liner

When comparing the Rock Flex chimney liners to the Flex King Pro chimney liner, there is no comparison. As far as quality, warranty, and price, the Flex King Pro chimney liner is hands down the best value for your money when you are shopping for a DIY chimney liner for your home.