Okna 800 or Starmark - Splitting hairs?
Hello, I have been reading the window forum for a while when I wanted research RBA before making a major purchase. I am glad that I did. Thanks to the good folks here it turns out that one of the highly recommended window manufacturers is local to me.
I am looking at the Okna 800 and the Starmark. My main interest was the Starmark after seeing the cut away profile of the 900 and its solid construction. After having 10 of 13 American Craftsman windows have glass seal failures in less then 10 years, vinyl was the last way I wanted to go.
Now on to comments an questions. The other half was concerned that the composite used in the 900 was new and the long term duration is not know. Can anyone comment?
After comparing the 800 to the 900 with the deluxe XR5 glass ( I really wanted the XR9 or 10, but I couldn't convince the other half of the triple pane) the specs are very close with the 900 U-factor of .25 and the 800 at .26. What did surprise me was the air infiltration number is much better on the 800 at .01 compared to the 900 at .05.
To complicate matters the Okna site shows the 500 with the same glass has better numbers then the 800 except the draft value at .02. Am I reading that correctly?
One other question, the site also says that the window test values are different with grids between the glass. I this enough to be concerning?
So we initially signed a contract for the 800's but the 900's were only 10% more. The installer said we could change the window up to the point the measurements are sent for fabrication. BTW these windows are $800-$1000 less per window than the Renewal by Anderson and have better specs.