"garden Window" U factor

[bgingras]

Have a contractor that proposes a "garden window" that comes back at a U fcator of .59...claims that is the lowest they are available. Homeowner wants to assure they are getting a code compliant product. We are in Zone 5 with a U fact of .35 max underprescriptive but skylights are .60...How would you approach this, or are these really just a non compliant product in my zone under the prescriptive...this is not a new house where the perfomance(rescheck) method could be used.

 

[rktect 1]

402.3.3

Try that.

 

[bgingras]

that was easy...his window is just under 15sf! Thanks

 

[FredK]

Not that I care but he didn't search vary hard. Note all the energy compliant window options and even with tax credits available.

http://www.thermalindustries.com/vinyl-replacement-windows/garden-windows/garden-window-290/

 

[TJacobs]

"But so-and-so in such-and-such town just let me put a bunch of these in..."

 

[NH09]

Thanks rktect 1 - another person in my office was trying to find a garden window that met the u-value requirements and we weren't aware of this exception, like bgingras we are also in zone 5. Fredk - you are correct, the two garden windows thermal industries offer have a u-value of .30.