How To Replace An Exterior Prehung Door

Exterior prehung doors allow you to replace your existing exterior door and frame with a single unit that includes a door, glazing, frame, threshold, weatherstripping, exterior trim, and predrilled holes for a lockset According to and depending on size, style, type, and material, a new exterior prehung door could cost anywhere from $75 to $5,000. I have seen some pvc systems on my travels that have a (in your case) a gold anodised cap that i assume is glued over the threshold to protect it from doing this exact thing, it would wrap over the bevel and go right down to the cill just stopping short so as not to block the drainage, if i knew where to get these it would help me also in my line of work but never seen them advertised so assume they must be specific the the pvc system.

I would caution you to investigate and fix whatever caused the water penetration (in case there was an additional issue besides the old threshold) and repair any damaged wood underneath before you install it. I assume your new one is aluminum since you mention filling it with spray foam, screw it down well with stainless screws that come with them are not always the best ones to use.

We need to add some sort of sweep at the bottom, but are running into problems finding one that will work with the door locking mechanism that goes into the floor. Excellent for small joints and fillets: windows, door frames, reglets, flashing, glazing, and many construction adhesive applications. Open the door and see if there’s a manufacturer’s label somewhere on the top or side near the hinges, if so, contact the manufacturer for a replacement sweep.

A better solution in this situation would be an Aluminum and Vinyl Door Sweep that attaches to the bottom inside of the door. If you notice a cold draft around your entry door during the winter months, your door may need to be sealed. Metal thresholds are frequently held down by screws concealed under vinyl inserts. But I’d want some kind of screen door between it… So maybe this pattern, in a security door instead of the main door. Coil Stock A sheet (usually prefinished aluminum), commonly packaged 12 to 30 inches wide on a 50-foot roll.


Once all three screws were in and holding the threshold in place, I reattached the saddle and adjusted its height to fit against the bottom of the door (this involved a lot of opening and closing the door). This will seal the gaps on the exterior of your home and prevent moisture intrusion. When the door is closed, the vinyl gasket presses against the bottom of the door. The door between our garage and house has probably been in place since the house was constructed. Several companies now manufacture special coatings for exterior perimeter insulation.

Turn screws clockwise to lower the threshold riser (when the sweep is dragging too much when the door opens). If it is too tight you may have to adjust the threshold to lower it or plane down the bottom of your door for the best fit. U-Shaped doors sweeps are totally BOGOs – you buy it for one thing (keeping heat in the house) and get a second benefit for free (preservation of your $200 or $500 door).

After the door frame is out, check the condition of the framing and subflooring in the sill area. The key to getting an exact fit on a new threshold is to use a template to transfer the jamb’s contours to the ends of the threshold, where matching contours must be cut. Unfortunately, replacing the door is a pricey undertaking, so I decided to try replacing the threshold.

If, for example, your door measures 35-3/4 in. wide and 79-1/2 in. tall, you’ll order a 36-in. What I found was about an inch of hollow door on one side and the other side had 1 groove and was still healthy wood. This will reduce the likelihood of ripples forming in the door bottom when it is affixed to the door. Pull the old threshold out, using a pry bar if necessary to release it from under the jambs. It seemed that the door was pre-hung including the threshold, so the right thing to do was to replace the whole door. If you can handle basic carpentry tasks, you’ll have no trouble installing a new prehung door in a day.

Aluminum or other metal on exterior, wood on interior, with door-bottom seam and vinyl threshold replacement. I.) Stuff insulation or minimal expanding foam in between the stud and door frame around the entire door prior to replacing casing. Window glazing wasn’t provided with the door or the glass, and I couldn’t get it from my supplier, so I got some from my local glass company. The task of replacing the entire door unit including the sidelights is not as hard as you might think.

The replacement sill is running ~ $160.00. I could have ordered a less expensive laminated threshold as described in the This Old House Step 3 below, but I liked the idea of replacing the threshold with something I know will be there for another 80 years, and I don’t know if the laminated sill would last that long. Bifold door heights have been under-cut by 1”. So the height of an 80” (nominal) door is actually 79”. I didn’t want the thickness of wood, but I did want the look, so I was happy to have metal tat blends in with the wood of the door.