A SECRET WEAPON FOR SECONDARY GLAZING

The ultimate concern is secondary glazing won't ever hold the thermal performance of Main glazing. The hole in between the panes will always be bigger than 12mm as it's mounted to the pre-current frames.A standard two-by-4 stud wall with batt insulation and wallboard and wood siding has an R-value of R-twelve to R-fifteen, which happens to be regar