help! code says tempered glass windows. any options for wui?
We are building a new house in a Wildland Urban Interface area. Apparently, noone (including myself) saw on the plans that ALL our windows need to be tempered on the exterior side for fire reasons, even though we do have a fire sprinkler system (another WUI requirement). I have Milgard Ultra double paned argon windows, 4 lites/window and about 17 of them are not tempered. I called Milgard, and they don't fire rate their windows (they can alternatively be fire rated to 20 min.).
What to do? I was brainstorming, and thought about 'storm windows' from my childhood in the deep South. Could anyone give an opinion as to whether it would be cheaper to install storm windows vs take apart my 4-lite SDL windows, replace the exterior one with tempered glass, fill with argon, then replace?
Any and all advice humbly appreciated!