Laminated Window Glass: moisture ingress & u-value

Possom1

I'm considering either option below for certain double-glazed windows.


a) Outer pane 6mm thick and inner pane 4mm.

b) The use of Pilkington Optilam Phon laminated glass.
astrasealdownloads.com/files/optilamphon.pdf


Both options would reduce external noise and also increase security.

Would option 'a' reduce the u-value?

With regards to option 'b', I've heard that long-term laminated glass can get moisture ingress between the panes and can look "milky" white around the edges of the glass. Are there any comments about this, and could this phenomenon potentially affect a good brand such as this?

fatty pang

Possom1 wrote: »

Both options would reduce external noise and also increase security.

Both otions will reduce noise transmission. Option A won't increase security in any meaningful way. You will need laminated glass to do that.

Possom1 wrote: »

Would option 'a' reduce the u-value?

Not if the cavity between the glass is not changed. Some systems can facilitate this but others can't

Possom1 wrote: »

With regards to option 'b', I've heard that long-term laminated glass can get moisture ingress between the panes and can look "milky" white around the edges of the glass. Are there any comments about this, and could this phenomenon potentially affect a good brand such as this?

With good windows this is simply not an isssue.

Possom1

Thanks very much fatty pang.