How to Flash Siding Block
How to Flash Siding Block - You Need Thin Stainless Steel
Watch this video to understand one correct way to flash a siding block for light fixtures, hose bibs, appliance vents, etc. It's much easier to install the special opens in a new windowstainless steel flashing tape as you're installing the siding rather than to do a repair.
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Why Must you Flash Siding Blocks?
Siding blocks require flashing because caulk almost always fails. Caulk is not a permanent weather barrier.
Look at the screenshot taken from the video showing how the caulk failed and you can see the brown water stain on the Tyvek house wrap. It's important to realize the photo below was taken AFTER the original smaller siding block was removed. It had no side nor bottom flashings.
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The red arrows point to a water leak along the right side of the OLD siding block that was in place for the original faucet. This water could have caused severe rot in certain situations.
Proper flashing of the edge of the opening as the siding is installed would ensure that should the caulk fail, the water will flow out under the siding block and out onto the siding below the block.