Velfac V200E fitting detail

[flanagaj]

We have finally decided to go with the Velfac V200E window system.  Good U values and also came in quite a bit cheaper than Norrsken and Rationale. 

I am looking at the installation detail for an exterior clad property with timber reveals and I am not convinced about it.  The foam compression strip, I think is probably fine, but silicone against exterior timber does not sound like the best option.  We are going with thermowood, so I am not sure whether that by it's nature will not absorb water and expand like regular timber will.

  

[Nickfromwales]

Anybody who specs silicone for this should be shot on sight.

 

Fundamental sealing such as this need to be done with a non-silicone mastic, such as a Sika product or something like CT1.