Best way to seal gaps around pipes under the sink?

What the numbers show

Counted from the threads quoted below. How we count

• Most of it landed at once — the busiest month was September 2026, with 9 people.
• This comes up 11.0× more often in r/homeowners than across the site as a whole.

1. 1
   Using spray foam to seal around the spot where the pipes come through the wall

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2. 2
   Buying a sheet of quarter-inch plywood, cutting holes for the pipes, disconnecting the plumbing to fit it in place, painting it, and reconnecting the plumbing

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3. 3
   Caulking around the top and sides while leaving the underside open for ventilation

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4. 4
   using silicone

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5. 5
   using expandable spray foam

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6. 6
   packing with steel wool

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7. 7
   using a box escutcheon

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8. 8
   Using a steel wool pad and drywall mud

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9. 9
   Patching the drywall properly with a new piece and using a metal escutcheon plate to cover the gap

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10. 10
    Taping off the area, applying caulk, and smoothing it with a wet finger

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11. 11
    Removing the faucets temporarily to allow proper access for caulking

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12. 12
    Using a dedicated caulking tool instead of finger-applying

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13. 13
    Hiring a handyman to do the project

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14. 14
    Applying silicone caulk to seal the gaps

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15. 15
    Using cardboard to fill gaps before smearing caulk over them

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16. 16
    Searching for exact brand-specific replacement gaskets

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17. 17
    Removing the board in the hole and filling the opening with concrete to smooth it out

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18. 18
    Searching for specialty 1-1/2 inch IPS plastic split flange covers or bell end escutcheons online or at plumbing supply houses.

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19. 19
    Fabricating a custom split ring out of 1/8" or 1/4" plywood using hole saws, then painting and gluing it around the pipe.

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20. 20
    Stuffing the gap with pipe foam.

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21. 21
    Choosing to ignore the issue entirely since it is hidden inside a cabinet.

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22. 22
    Using duct putty as a temporary filler.

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23. 23
    Applying anti-rodent expanding foam insulation.

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24. 24
    Shoving steel wool into the hole and covering it with exterior caulking.

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25. 25
    installing physical support under the sink

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26. 26
    applying silicone caulk

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In their words

Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.