Readers ask: Why Does Redwood Siding Bubble?

Readers ask: Why Does Redwood Siding Bubble?

What causes exterior house paint to bubble?

Paint blisters or bubbles occur when the paint film lifts from the underlying surface. The loss of adhesion between the paint film and surface is usually caused by heat, moisture or a combination of both. This condition eventually leads to peeling.

How do you fix bubbles on an exterior wall?


  1. Repair loose caulking and improve ventilation of the building to prevent a recurring problem.
  2. Remove the blisters by scraping or sanding down to the bare surface.
  3. Prime all bare areas with a high-quality primer.
  4. Repaint the surface with a high-quality paint in the desired finish.

Why does paint bubble on cedar siding?

There is always moisture in wood – the problem comes when the primer deteriorates, whether it be crumbly or didn’t stick because wood had mill glaze. It’s when the sun heats the surface, similar to using a heat gun that makes the paint expand and comes off the surface and form a bubble.

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Can you paint redwood siding?

Use two topcoats of a top-quality acrylic latex paint for redwood siding. Acrylic latex paints remain flexible with age, thus stretching and shrinking with the wood and allowing some passage of water vapor.

Should you pop paint bubbles?

What to do if paint bubbles pop -up? If paint blisters do appear, don’t touch them. Give the wall time to completely dry and cure before addressing the problem by scraping, patching, sanding, cleaning and repainting.

Why does paint bubble on siding?

Bubbling of exterior paint coating is usually caused by moisture in the substrate (wood siding, stucco, etc.) Moisture bubbles, unlike heat blisters, will go through all coats of paint down to the substrate. To stop moisture bubbles, you must find and eliminate the source of moisture intrusion.

What do you do if you have a water bubble in your wall?

Repairing the Damage | If the damage is superficial, you may not have to replace the drywall. Dry the area thoroughly, sand the blisters from the wall and prime the spot with a pigmented lacquer product called KILZ. This product will keep the stain from bleeding through a new coat of paint.

What temp does paint bubble?

If you paint your house when the temperature is too hot, the paint dries too rapidly and the heat compromises adhesion. At temperatures over 90 F / 32.2 C, bubbles and blisters form in the paint.

Why is my second coat of paint bubbling?

Moisture can also cause paint bubbles to form. The paint company Sherwin-Williams says moisture might be seeping through the walls, or that damp conditions could be occurring in areas such as the basement. If you think there is too much moisture in the room, take steps to remedy this issue before completing the repair.

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Does damp cause paint to bubble?

Bubbling or peeling paint When non-breathable building materials are used (such as modern plaster or vinyl paints ), any moisture in the walls becomes trapped, as it has nowhere to escape too. This causes paint to bubble or flake.

What causes paint to crack?

What causes paint to crack? Insufficient surface prep is the main culprit behind crack attacks. Over-thinning your paint or applying it too thinly can also cause it to split. Conversely, a heavy hand while painting can lead to what’s called mud cracks, where too-thick paint dries with a clumpy, swollen look.

Should you paint redwood?

Bare redwood rejects painted finishes unless it receives a primer base coat. Apply a particular type of primer and paint according to the location and function of the redwood surface.

Can you power wash redwood siding?

Regular cleaning of the surface of the redwood with water will remove surface dirt and stains from tree sap. Pressure washing is often used on siding, but should be done carefully to avoid pitting the wood and dislodging the siding from its position.

How do you seal Redwood?

Apply a protective seal. A high quality product like Preserva Wood with high UV protection and water repellent will give the best results. Use a brush or a roller to apply the stain to your redwood structure. Apply the finish on a cool day without wind, don’t treat your deck in the hot sun.

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