Cracking Iberville PVC Triple Pane Windows
Can someone explain to me why my new reno triple pane low E Iberville brand window keeps cracking the glass after installation. I have heard a number of explanations from the "supplier\installer". It is a south facing window. The installer acted like we were "crazy" wanting shims installed under the mullions. Any web sites, pdf files or information would be greatly appreciated. A CSA standard for Canada would be great but would cost me $90.00. Thanks.