It was adopted for the renovation of an apartment building, and the installation has been completed. This time, we used the “foaming method” to install the sashes and insulate them at the same time. The foam method is a construction method in which wooden sashes are temporarily fixed with wedges and then filled with special urethane foam in the gap between the sashes and the building frame. This method is suitable for heat insulation repair and renovation work because it can be installed by covering the existing aluminum sashes from the outside without removing them. It is also an alternative construction method to welding, and is suitable for construction sites where anchoring is difficult or firearms are strictly prohibited. Of course, it can also be used for new construction. If you are interested in learning more about the foaming method, please feel free to contact us.