Nailing fins, sometimes called mounting flanges, are the thin strips installed on the exterior sides of a window. Unlike a “front flange” which is a decorative trim piece, a nailing fin is usually set back from the outer edge of the window frame and has fastener holes punched into it.
Replacement windows have no nailing fins or flanges. They are smooth-sided for easy insertion.
An unsealed bottom fin will create an escape route for any water that finds its way past the building envelope somewhere above the window. The name “nailing fin” would suggest that nails would be the fastener of choice, however, screws work better and not just because they have more holding strength.
Vinyl windows for "new construction" can usually have the nail fin cut off with a knife or saw. Then you install the window using the replacement or upgrade instructions. Usually consisting of screws in the sides, insulation and shims.
Windows Without Nailing Flange are fastened from the inside of the structure using the existing window frame and there is typically no need to remove or replace existing trim and siding. These are an easy and cost-effective way to upgrade your windows.
In many cases, windows can be installed at least partially from the outside. However, every home is unique, and there may be some features of your home's window openings that require all or part of the replacement window installation process to occur inside.
Florida Flange is a large exterior fin, used on windows in concrete applications with block openings. The Florida Flange is attached to the wooden framework or buck, and sealed to the masonry wall. This is done to conceal the existing frame and to give a clean finished look.
What is a flush fin frame window? Flush fin (also known as Z-Bar) frames are designed to replace aluminum frame windows while preventing damage to stucco and interior dry wall. It consists of a vinyl fin that surrounds the perimeter of the window frame and is flush with the exterior frame of the existing window.
Depending on where you buy your new construction window, you may or may not get a screen along with it. This is solely upon the seller's discretion. Sills, on the other hand, are almost always a separate purchase.
Can New Construction Windows Be Used for Replacement? New construction windows can be used for replacement window projects in two ways. Remember, the only difference between a new construction window and a replacement window is the nail fin.
They can be included as an attachment as in the case of most window replacement projects, or they can be retrofit after the window frame has been installed. Jamb extensions reach out from the jamb from the top, sides and bottom (in most cases, depending on finishing requirements) of the window.
- Use either an exterior grade nail (roofing nail) or an exterior grade screw to secure the window. Make sure the nail/screw securely fits into the framing of the wall. Do not place a nail/screw within 6” of each corner. Nails/screws should be set no more than 12” apart.
Once the window functions properly, nail off the rest of the top and side flanges every 4 in. to 6 in. Eliminate drafts with spray foam. Instead of stuffing fiberglass insulation around the window, apply low-expanding spray foam for the best air seal.
The typical window replacement cost is between $200 and $1,800 per window, and the national average is around $100 to $650 per window, depending on window frame material and glass type, among other factors. Labor adds to the overall window replacement cost and can run approximately $100 to $300 per window.
Remove any screws holding the windows to the flange. Tap the frame around the windows with a block of wood from the inside to push them out of the opening, being careful not to break the glass. Once the windows have been removed, use a hammer and chisel to remove the metal flange around the openings.
Use Steel Screws
The recommended replacement screw for replacement windows is the steel screw. When installing your window make certain the steel screws are installed flush with the vinyl jambs, yet be careful to not over tighten and press the window unit against the outside stops to achieve a snug fit.
Nail Sizes
The diameter of the nail should be no smaller than 5/16 inch. The shank of the nail should be 1/8 inch. The length is also important. For a general vinyl framing nail, choose a 1 1/2-inch size.