How to Weatherproof Your Wooden Garden Playhouse

Sealing a wooden playhouse involves adding a layer of protection against weathering. This barrier prevents the structure from warping, rotting, or encouraging mould growth. Parents must prioritise sealing to ensure their little ones can continue playing safely.

Can Sealing Make a Difference?

Varnished wood surface.

(Image Credit: Flickr)

Yes, sealing makes a significant difference in playhouses, particularly those made of wood. It protects the timber structure from weathering, moisture, and damage over time. This barrier prevents warping and rotting, thereby extending the wood’s lifespan. Remember, the longer the playhouse lasts, the more time children enjoy endless adventures!

When Should You Seal Your Wooden Playhouse?

BillyOh Lollipop Junior Tower Playhouse
BillyOh Lollipop Junior Tower Playhouse

The best time to do so is immediately after completing construction or installing. Seal the wood structure before applying any paint to create a protective barrier. This will help prevent moisture that can potentially cause warping and rotting. Plus, it improves the paint’s adhesion for a smoother and longer-lasting finish.

Apply multiple coats for a quality seal; leave plenty of time between coats. Once completely dry, you may start applying paint.

How Often Should You Do It?

Ideally, every 1 to 2 years. But factors like weather conditions and the type of sealant used can influence this. For instance, if you notice the wooden playhouse looking dry, it’s a good indicator that it’s time for resealing. The same applies if the previous sealant is wearing off or if the unit is often exposed to harsh weather.

Stay attentive to these cues and maintain a regular sealing schedule as needed.

Which Sealants Are Best for Wooden Playhouses?

You have three options:

  • Exterior-grade acrylic sealant: This type provides excellent weather resistance and UV protection. It’s easy to apply and dries quickly.
  • Polyurethane sealant: The best solution against moisture, rot, and mildew. It also forms a strong, flexible barrier that withstand harsh weather conditions.
  • Linseed oil-based sealant: Known for its natural appearance and deep penetration. It provides long-lasting protection while enhancing the wood’s natural beauty.

Always follow the manufacturer’s instructions for proper application and maintenance.

What’s the Best Ways to Apply Sealant?

The best ways to apply sealant to a wooden playhouse are as follows:

  1. Clean the surface: Do this by removing any accumulated dirt, dust, or debris. This guarantees the sealant will adhere well to the wood.
  2. Apply in thin coats: Allow each layer to dry before applying the next one. Avoid applying sealant too thickly, as this can lead to uneven coverage and drips.
  3. Use the right tools: It can be a brush, roller, or sprayer — whatever works for you. Make sure the tool is appropriate for the type of sealant you’re using and the size of the playhouse. A roller is ideal for acrylic sealant, a sprayer for polyurethane, and a brush for linseed.
  4. Read and follow the manufacturer’s instructions: Do so for the specific sealant you’re using. This includes information on drying times, recommended application methods, and any safety precautions.


Sealing your wooden playhouse is crucial for its durability and weather protection. You can ensure a safe and lasting play area for your kids by adding it to your maintenance routine. And if you haven’t found the perfect playhouse for your little ones, they’d love our playhouses with slides!

Should you have any further questions, please don’t hesitate to contact us at 01909 768840. Up next on your reading list: The Complete Playhouse FAQ – All Your Questions Answered!

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