Q&A / 

Install a New Front Door and Save Money

fiberglass front door

A gorgeous front door like this can be installed in one day. This is a Therma-Tru fiberglass door at my own home! I was so excited I took the photo before I painted the trim. You just need to know secret master carpenter ninja tricks. © 2017 Tim Carter

Install a New Front Door TIPS

DEAR TIM: My front door is in bad shape, and my wife wants a new one. We visited a showroom and I see that I can purchase a new front door that's already prehung in the frame. It seems that all I have to do is just nail it in place and I'm good to go. Do you feel I can install a new front door myself? Surely it's not as simple as just nailing it in place. What tips can you share to help me get this done and save lots of money? Gary B., Portland, OR

DEAR GARY: Installing a new front door is an ambitious project, especially if you've never installed a door before. That's not to say you can't do it. I just want to manage your expectations. There are many steps required to ensure the door works properly, seals tightly to save energy, and that absolutely no water leaks into your home. Water leaks at exterior doors can cause serious structural damage over time.

CLICK HERE to get FREE & FAST BIDS from local carpenters who can install your new front door.

Great DIY Install Videos

It's impossible in this short column to give you all the knowledge I've attained about door installation over the years. Click here to see my video series of how to install a new front door. The money you save by not hiring a contractor can be used to purchase a nicer door.

Pre-Hung Best Way

Let's talk about what can go wrong so you know the pitfalls in this project. For starters, you can make a mistake and purchase the wrong door. If your home is less than 50 years old, you should be able to purchase a pre-hung door that fits very nicely in your existing opening.

But to make sure that you don't goof up, you need to check measurements before you get out your credit card.

Ninja Measurement Tricks

In my opinion, the easiest thing to do is to remove the interior trim that surrounds the door. You can do this with a razor knife, a wide putty knife and a flat pry bar. Always start at the bottom of the door where the trim meets the door jamb at the floor.

Be sure to cut a very fine line with the razor knife where the trim touches the wall surface. This ensures any caulk between the trim and the wall surface doesn't cause the drywall paper to tear off the wall as you pull the trim away from the wall.

How to Install a New Front DoorOnce the trim is removed, you can see the entire door frame. Use a flashlight if necessary to see where the bottom of the door frame and the threshold assembly touch your concrete slab or the wood subfloor.

Unit Dimensions

Your job is to obtain the outer width and height dimensions of your existing door frame assembly. These are commonly referred to as unit dimensions. It's critical that your new door match these dimensions as closely as possible.

You also want to determine the thickness or width of the door jamb. It's usually either 4 and 9/16ths or 6 and 9/16ths. This is the actual thickness of the wall if you measure the width of the wall studs plus the thickness of the interior drywall and exterior wall sheathing.

CLICK HERE to get FREE & FAST BIDS from local carpenters who can install your new front door.

Supplies & Tools

Once you have the new door, you need to make sure you have all the other supplies you need. Don't start to tear out your existing door unless you have everything on site. You'll need (click following links to my preferred products):

Read Instructions

The next step, before you start to remove your old door, is to read all the written instructions that come with the new door. Check to make sure all the dimensions are correct. Check to make sure the new door swings the same way as the old door.

Be sure you have all the supplies the written instructions call for. You don't want to remove your old door and find out that you're missing some critical materials.

IMPORTANT TIP: The biggest mistake most rookie installers make is installing a new door without a proper flashing under the door. Many feel that a bead of caulk will stop water infiltration. It will not. You need a flashing to keep your house waterproof.

Best Flashing Kit

I always install a wonderful plastic pre-formed flashing pan under my doors. They come in various sizes to accommodate all doors. It takes just minutes to install this critical component.

Jamsill flashing pan

I've used this JamSill flashing pan for years. It's fantastic. Best part: EASY to install! CLICK THE IMAGE NOW TO ORDER ONE.

Once the new door is in the opening, you want to secure it with the wood shims and the rust-proof fasteners. As you do this, you're constantly checking to make sure the door frame is not twisted, that it's plumb, and the door threshold is level.

If your door doesn't have glass sidelights, you want to make sure you install a very long screw behind the top door hinge so the door frame is securely fastened to the rough framing. This prevents door droop.

CLICK HERE to get FREE & FAST BIDS from local carpenters who can install your new front door.

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