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Posted

Hey folks - we're in the process of finishing up our extention but noticed some drips running out from underneath the plasterboard. Cut out the plasterboard section and it appears the VCL is very sweaty in the area where the new (timber frame) and old (regular brick/block cavity) construction meet.

 

I ran the VCL over the join from the TF to the blocks thinking it would help with air tightness on that junction, but I'm wondering if it's worth cutting back now to let the block wall breathe a bit more... or is the VCL simply doing its job by holding the moisture on the room side??!

 

We're also in a cold snap and we've only just plastered and had the screed done recently so theres a lot of moisture in the air.. dehumidifier is down to 68%, room temp is ~20degC.

 

Any thoughts/ideas/inputs would be appreciated!

 

MM.

PXL_20250314_123703885.png

Posted
51 minutes ago, MrMagic said:

or is the VCL simply doing its job by holding the moisture on the room side

Seems to be doing its job.

 

If you know the RH, the inside and outside temperatures, you can work out if the dewpoint has been reached.

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