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How do you tell which window gaps in siding should be caulked?
A crack or separation around a window or door can look like a straightforward caulk repair, but I’m not sure every visible gap is meant to be sealed. With vinyl siding especially, some joints may need to stay open for drainage, and sealing the wrong spot could hide water getting behind the siding.
How do you identify the siding and trim materials and figure out whether a particular joint should be caulked? Does the answer usually come from the siding or window manufacturer’s installation guidance, and what signs of water entry would make it worth asking a siding professional to assess the area rather than just re-caulking it?
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A key distinction is whether the gap is part of the siding’s drainage path, not just whether it looks like a crack. Vinyl siding is designed to shed most water, but some water can get behind it and needs a way back out. Sealing a drainage opening can trap that water. Is there a siding or window installation detail for the specific joint? I’d caulk it only if those instructions call for sealing it.