Sealing timber cladding/reveal around window?

[junglejim]

I’m cladding my timber frame house using thermo ayous. I’ve tuned boards to make reveals  for the windows that butt up against the frame. I’m wondering whether I should run a bead of silicone sealant sling the joint for weather tightness?

[Mr Punter]

Silicone probably will not last very long and may discolour.  Can you do it without?

[junglejim]

  On 05/04/2025 at 10:08, Mr Punter said:

Silicone probably will not last very long and may discolour.  Can you do it without?

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Yes no problem without but wondering what others do?

[BotusBuild]

I plan to use the external Soudal SWS sealant

[Russell griffiths]

Leave a gap, it allows it to dry out quicker if it was to get wet. 
mat risinger did a video on this on YouTube, it was found that sealing up every gap kept moisture in rather than letting it in briefly and out quickly. 

[junglejim]

  On 05/04/2025 at 12:08, Russell griffiths said:

Leave a gap, it allows it to dry out quicker if it was to get wet. 
mat risinger did a video on this on YouTube, it was found that sealing up every gap kept moisture in rather than letting it in briefly and out quickly. 

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Thanks Russell that’s helpful and exactly what I was wondering.

[JamesP]

  On 05/04/2025 at 12:08, Russell griffiths said:

Leave a gap, it allows it to dry out quicker if it was to get wet.  

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+1.