Can you use fiberglass insulation in a basement after flooding?
Combining foam board and fiberglass insulation is a common DIY approach after tearing out flood-damaged materials, but mixing insulation types requires careful planning around moisture. Using a moisture-resistant alternative like rockwool prevents the insulation from getting ruined if water ever works its way through the foundation again.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
- 1Hiring a restoration company
- 2Using rockwool instead of foam board and fiberglass combinations
In their words
Unedited, most upvoted first, each linked to the thread it came from.
“Had some flooding in July with several feet of water. Ripped everything out. I’d really like to insulate myself instead of getting a restoration company. Does it make sense to do foam board insulation and then fibre glass insulation?”source ↗
“I went through a similar renovation project, although it wasn't brought on by water damage rather just a basement that hadn't been renovated since the 70s. I went with rockwool because it doesn't get ruined if there's ever any water that works its way through the foundation”source ↗
Where this came up
People with this problem also raised
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- 2Can I insulate and finish basement walls if they get damp?
- 6How to clean mold under water damaged flooring without DIY experience
- 4Water damage in a brand new construction house