The Optimist
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Go to Boards.ie for window manufacturer discussionsWe're not allowed to talk about <snip> good or bad on this website.
You write elsewhere that u have addressed the cold bridging and yet you are suggesting 1" warm-board around the steel section, after the window is fitted....
One of the issues is that this is for a big glazed section, all fixed panes, all about 1500 x 2400, so there will be very little frame. And we will be putting an inch of warm-board around the steel pillars on inside and outside which will cover another inch or more of frame.
...
Quotes go from 3400 up to 7000 with a median of 4300 for the same job.
whats the point is filling the box section with bonded bead: this idea shows a complete lack of understanding of the path the heat and cold will take.
As to using closed and open cell foam fill: the first question is how will you know which is whichUnless they are colour coded then its impossible.
because of the price difference, its more likely u will get open cell throughout rather than closed cell
Open cell is permeable and will absorb moisture ( some designs allow the passage of moisture through it) so if the moisture barrier is not 100%, which it never is then where will the moisture end up: against the steel perhaps.
EI not an option as you describe.
The issue here is that the frame and the windows have been designed in isolation, rather than joined up thinking.
The way this is done in the commercial world can be seen if you google "thermally broken alu sections".
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