Making the Decision The decision to install a replacement window from the “outside in”, against the interior stops, by removing the exterior stops, requires more outside work, but this method of installation has many added benefits: 1. The interior stops don’t need to be removed and replaced which makes a better look- ing installation since there is no damage to over-painted inte- rior stops or mould- ing, etc. The job is cleaner and neater. 2. Since the exterior is to be re-finished in most instances, there is a work savings by not having to remove and replace the inside stops. 3. It is easier to brake and install capping to finish off the exterior of an opening without a blindstop than to cover an old blindstop. The capping looks better, too. 4. Most Replacement Windows without head expanders fit better against interior stops without the 1/8" offset of the material thickness of the expander. 5. The installation is more energy efficient and requires no insulation stuffed into the head expander.. 6. More glass and egress area is possible without a head expander. The window can be made taller. These advantages have to be weighed against the labor of chipping away the blindstop and shimming and squaring the opening from “outside”. The dia- grams show that the exterior “blindstop”, when removed, clears the opening allowing a full height, full width window to be securely installed without the use of a head expander. Outside-In Installation of Box Frame Windows Box Frame Installation of vinyl replacement windows is based on "blindstop" techniques where the window is set into the opening from the inside of the house. Outside-In installation is accomplished from the outside the house and leaves the interior stops intact. Paring away the exterior blindstop, removing the parting stops and both sash provides a clear opening to install the window from the outside without disturbing the interior and without having to lift it over the stool to place it in the opening. This is an advanced technique that is somewhat more complicated than the traditional "blindstop" method. But its advantage lies in giving satisfactory results while probably being a more effective method for installing all vinyl replacement windows. But, it is important that the old window frame is adequately integrated into the water management system of the wall, or you should use frame out techniques. Outside-in installation will require access to the opening from outside the house, and though the window can be passed out of the opening from the inside before it is set in place, it may be an advisable and safer method to set the window in place from the outside. For openings above the ground floor, or for large or heavy windows, it is not recommended that outside-in installations be done by one person. Proper Flashing is Recommended Window Fitters Guide to Window Installation 48 ©2022 AWDI, LLC Do not reproduce without permission If you leave the old frame in, and install from the out- side, it is best to “flash” the opening. Using liquid flashing on the sill, a pan can be created that will allow any water intrusion to drain to the outside. Using adhesive-backed applied flashing on the jambs and header, make sure the jamb overlaps the sill, and the header flash- ing overlaps the jambs. SAMPLE MANUAL
View this content as a flipbook by clicking here.