How to Install a Fiberglass Entry Door | This Old House

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This Old House general contractor Tom Silva shows how to upgrade an entryway with a brand-new, low-maintenance, energy-efficient door. (See below for a shopping list and tools.)

Tom and Kevin replaced an old, wooden exterior door with a new fiberglass door. Because the old door had thin wood panels and poor weatherstripping, it was not energy efficient. The new fiberglass door had foam insulation inside and dual-pane insulated windows. With the trim removed, Tom used a reciprocating saw and a pry bar to cut the nails holding the jambs in place and removed the entire door unit. The new pre-hung door would rest on the subfloor, which was not level. To correct this problem, Tom scribed two wood strips and attached them to the top of the subfloor. These strips also elevated the new threshold so that when the door is opened, it will clear any rugs or carpet that might be in the way. Next, Tom installed a flexible "self-sealing" flashing over the front edge of the opening and applied a generous bead of caulking to protect the underside of the door from any water penetration. With the flashing in place, Tom and Kevin inserted the new door into the opening, checked the jambs for plumb, inserted shims and screwed the unit in place. Next, Tom and Kevin installed a lockset and used minimal-expanding foam insulation between the jambs and framing to seal out drafts.

Shopping List for Installing a Fiberglass Entry Door:

Tools for Installing a Fiberglass Entry Door:

About Ask This Old House TV:
Homeowners have a virtual truckload of questions for us on smaller projects, and we're ready to answer. Ask This Old House solves the steady stream of home improvement problems faced by our viewers—and we make house calls! Ask This Old House features some familiar faces from This Old House, including Kevin O'Connor, general contractor Tom Silva, plumbing and heating expert Richard Trethewey, and landscape contractor Roger Cook.

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How to Install a Fiberglass Entry Door | This Old House

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I had the opportunity to meet Tom and had a drink with him. What you see here is exactly what he's like- cool, collected, humble and incredibly experienced. Wonderful guy.

boatdetective

Thank you for working on an opening that wasn't level

nfztkrp

I've seen Tom do a lot of scribing, but video showed me EXACTLY what he was actually doing. Thank you Tom Silva...

jordansdad

I love watching his videos. His workmanship always shows his skill level and confidence. Not many contractors with this level of quality left. Anyone who takes time to scribe bottom plate shims is ok in my books!

nathr

I am installing a new exterior door. I watched many clips about installation of an exterior door. This Old House's clip is the most practical and most comprehensive one. Thank u.

irarajabi

I should just start all my projects watching their videos first. It's so easy to grasp the concepts with how they teach, and not too long winded.

JayZoop

There's no need to put fasteners through the jamb where they're visible. The gasket that the door seals against can be removed and you could put a fastener right adjacent to this kerf cut. When you reinstall the gasket it will hide the screw.

racerx

Tom is the salt of the earth, wish i had a small percentage of his tools

Coronet__

Watched several door install vids to pick up on some pro tips. This was the best one out of the group. Checking clearance on the bottom of the door for a rug or floor mat is something I can see a bunch of ppl not considering.

davidrobertson

Just replaced the old door on my garage that was never meant to be an exterior door, was rotted out, and had cracks and leaks everywhere. Now it's actually insulated, and just in time for New England weather! Thanks!

shalormckee

Kevin asks the best questions... he's a great teacher

Side_Bar

What I like is the fact, since it wasn't shown in the video .The latch set is mortised out. That's one of the tough parts of the door install. Not splitting the door when you chisel it out.

BZ

Thank you thank you thank you!! Sage willing to share wisdom. THIS is why I love youtube. Installing my new fiber glass entry door. It too is not level and significantly shorter. It was like this video was made for my situation. You guys are GREAT!!!

bucket

1. Gap and Crack Spray Foam is NOT for Doors or Windows.
2. Rough opening should be wrapped using house wrap
3. Sills should have metal drain pans
4. Shim and Fasten the Jam behind every hinge plus latch plate and more
5. Check Door Reveal around Jam
This video should be a lot longer and provide way more details. I would hate for a DIYer to install a door based on this information

bLake-Mow-Hawn