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Paint Blistering From Inside? It May Be Subterranean Termites
Paint that bubbles, blisters, or peels without an obvious water source near the floor level or above slab penetrations may indicate subterranean termites working through wall framing — introducing moisture as they build galleries inside your walls.
Subterranean termites need moisture and will introduce it into wood as they consume it. When they're active inside wall framing, the moisture they bring can cause paint to blister or bubble — especially near baseboards, around sill plates, and above concrete slabs.
Blistering paint near floor level is more likely termite-related than blistering higher on walls, which is more commonly a plumbing or condensation issue. Look for associated signs: mud tubes at the base of interior walls, soft or spongy flooring above an active area, or musty odors.
If you also notice uneven floors (slightly sagging or bouncy spots), this may indicate subterranean termites have compromised floor joists — an urgent situation requiring both inspection and potentially temporary shoring.
Don't repaint over blistering paint without investigation. A licensed inspector can probe the area, check for soft wood behind the wall surface, and use moisture meters to distinguish termite activity from plumbing or condensation issues.
Frequently Asked Questions
How do I tell if blistering paint is termites or water damage?
Water damage typically originates from a specific source (leaking pipe, roof, window). Termite moisture comes from within the wood. Signs that suggest termites: blistering concentrated near floor level, associated mud tubes or soft flooring, no obvious water source above or behind the area.
Do subterranean termites work inside walls?
Yes — subterranean termites enter through soil contact points, foundation cracks, and utility penetrations, then travel through wall framing consuming wood from the inside. They can work inside walls for years before visible surface signs appear.
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