- Step 3 – Installing the Flashing Tape. Install the side flashing tape, beginning at the top and slowly work downward. Carefully pull the backing from the tape and press it into the side of the window or door. Smooth out the tape as you work. Be sure that the tape overlaps the lining of the sill pan.
- DuPont™ Flashing Tape for Inside and Outside Wall Corners View the Complete DuPont™ Flashing Systems Guidelines for Windows and Doors Commercial/Greater than 4 Stories and High Performance Installations of any Height.
- Install the sill pan or fabricated sill pan flashing using flashing tape around and under the window or door R.O. Add a second course of flashing tape on the sill surface as shown in the example at above/left, adapted from Pella® Window installation instructions cited later in this article.
- POST a QUESTION or COMMENT about choosing & installing exterior doors
When sealing a patio door, check the manufacturer's instructions and be sure to follow the directions carefully. To install the flashing, cut pieces of building paper and self-adhesive flashing to fit and install them in the correct order (bottom, sides, top) around the opening.
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Payday the heist trainer. Door & window flashing & sealing:
This article describes the proper flashing details for exterior doors to avoid air leaks, rot, decay, and energy losses at doors.
In this article series we discuss the selection and installation of windows and doors, following best construction and design practices for building lighting and ventilation, with attention to the impact on building heating and cooling costs, indoor air quality, and comfort of occupants.
We review the proper installation details for windows and doors, and we compare the durability of different window and door materials and types.
Page to photo: an entry door in Cannaregio in Venice showing the door bottom sealing insert panel used to block water entry at the door bottom during periods of aqua alta.
We also provide a MASTER INDEX to this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need.
Guide to Exterior Door Flashing Details
As detailed in Best Practices Guide to Residential Construction Chapter 3, BEST PRACTICES GUIDE: WINDOWS & DOORS:
Doors are flashed the same as windows on the sides andtop, and similarly at the sill. Clad door frames are flashedlike clad windows (see our window flashing illustrations below, Figures 3-13, Figure 3-15, Figure 3-16) and solid wood frames are flashed like traditionalwindows with brickmold (Figures 3-17 also below).
[Click to enlarge any image]
Figure 3-13: Installing Flange-type Doors or WIndows Over House-Wrap
Figure 3-15: Installing Flange-type Doors or Windows Before the House Wrap is Applied
Figure 3-16: Installing Flange-type Doors & Windows with Felt Paper
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This article includes excerpts or adaptations from Best Practices Guide to Residential Construction, by Steven Bliss, courtesy of Wiley & Sons.
See WINDOWS & DOORS our home page for window and door information, and also
see WINDOW TYPES - Photo Guide for a photographic guide to window and door types and architectural styles.
Figure 3-17: Installing Doors & Windows with Brickmold Trim
Unless adoor is well-protected by a porch or large overhang, goodpan flashing at the sill is critical to prevent water fromseeping into the floor framing.
Doors leading to patios and decks are particularly vulnerable to wetting around the sill from splashback and, in cold climates, from snow buildup.
Pan Flashing for Exterior Doors & Windows - Rot below a Sliding Glass Door
Above: this aluminum sill for a sliding glass door was installed over the plywood subfloor of the author's New York offices in the 1970's. The carpenter used no pan flashing. Below our next photo shows the extensive rot that ensued.
Prefab plastic door pans typically come in three sections that are fused together at the required length with solvent-based cement. Metal pans require a brake to form and should be caulked or, preferably, soldered at corners.
In fact the absence of effective flashing at this 20-year-old sliding glass door (photo above) led to the need for a complete door, door jamb, and trim replacement on this Poughkeepsie home.
When the new door was installed we included a sit-built pan flashing and membrane flashing around the door for a more durable replacement.
Peel-and-stick membranes have becomeincreasingly popular due to their ease of use and flexibility.
Whether to use a metal pan, plastic pan, or peel-and stick membranes is a matter of personal preference as all work well (see Figure 3-26 below).
Figure 3-26 - above, flashing details above and below an exterior door
Figure 3-27 - above, pan flashing and threshold details below an entry door
Whatever material is used, all pans should have a damon the ends and along the inside edge
On the exterior, the pan flashing should lap over the deck or masonry flashing below. If forming a pan with peel-and-stick membrane, carry it up the sides at least 6 inches, and turn up the inside edge so it is held in place by the underlayment or finish flooring (Figure 3-27 above).
Also see
Window and Door Resources: where to buy window and door products
As noted in Best Practices Guide to Residential Construction Chapter 3, BEST PRACTICES GUIDE: WINDOWS & DOORS:
Manufacturers of Windows & Doors
Windows and Patio Doors
- Andersen Windows and Doors www.andersenwindows.com Vinyl-clad windows and patio doors, including storm resistant models
- Atrium Companies Inc. www.atriumcompanies.com Vinyl and aluminum windows and patio doors
- Certainteed Corp. www.certainteed.com Vinyl windows and patio doors
- Crestline Windows and Doors www.crestlinewindows.com Wood, vinyl, and aluminum-clad windows and patio doors
- Eagle Windows and Doors www.eaglewindow.com Extruded-aluminum-clad windows and sliders with LVL frames and steel entry doors
- Fibertec Windows and Door Manufacturing www.fibertec.com Pultruded fiberglass windows and doors
- Hurd Windows and Doors www.hurd.com Wood, vinyl, and aluminum clad windows and patio doors
- Jeld-Wen Windows and Doors www.jeld-wen.com Wood, vinyl, aluminum-clad, and aluminum windows and patio doors
- Kolbe Windows and Doors www.kolbe-kolbe.com Wood, vinyl, and aluminum-clad windows and patio doors
- Marvin Window and Doors www.marvin.com Wood and extruded-aluminum-clad windows and patio doors, including true divided lites and storm-resistant models
- Milgard Windows and Doors www.milgard.com Wood, aluminum, vinyl, and fiberglass-clad windows and patio doors
- MW Windows www.mwwindows.com Wood, vinyl, and vinyl-clad windows and patio doors
- Peachtree Doors and Windows www.peach99.com Vinyl-clad and aluminum-clad windows with optional hardwood interior; aluminum-clad, steel, and fiberglass patio doors with optional hardwood interior
- Pella Windows and Doors www.pella.com Wood and aluminum-clad windows and patio doors with optional between-the-glass shades and blinds, including storm-resistant models
- Thermotech Windows Ltd. www.thermotechwindows.com Complete line of fiberglass pultruded windows
- Weather Shield Windows and Doors www.weathershield.com Wood, vinyl, vinyl-clad, and aluminum-clad windows and patio doors, including historic replacement windows and storm-resistant models
- WindsorWindows and Doors www.windsorwindows.com Wood and vinyl windows and patio doors, including a line of wood windows with a cellular-PVC exterior
Door Manufacturers & Products Guide
Photo: an example of an exterior door exposed to weather that can get by with no pan flashing whatsoever. This metal door, installed in a soldiers and sailors monument in Brooklyn, New York, opens over a stone threshold that is yet another step above grade level.
Both the threshold and the step drain towards the exterior.
A modest angle-flashing affixed to the door bottom directs wind-blown rain down the door and out to the exterior. [Click to enlarge any image]
- Benchmark Entry Systems (division of Therma-Tru Doors) www.benchmarkdoors.com Steel and fiberglass entry doors
- Jeld-Wen Windows and Doors www.jeld-wen.com Wood, wood composite wood, fiberglass, and steel entry doors
- Kolbe Windows and Doors www.kolbe-kolbe.com Wood, steel, and fiberglass entry doors with LVL core and optional extruded-aluminum cladding on frame
- Lamson-Taylor Custom Doors and Millwork www.lamsontaylor.com Custom pine and hardwood entry doors with foam insulation core
- Masonite Corp. www.masonite.com Steel, wood-edged steel, and fiberglass entry doors
- Peachtree Doors and Windows www.peach99.com Steel and smooth and textured fiberglass entry doors
- Pella Windows and Doors www.pella.com Fiberglass and steel entry doors
- Phoenix Door Manufacturing Company www.phoenixdoor.com Softwood and hardwood entry doors up to 8 ft. high and custom designs
- Simpson Door Company www.simpsondoor.com Douglas-fir, hemlock, oak, and mahogany entrance doors, including custom doors; also primed MDF, particleboard, and composite wood doors
- Stanley Door Systems (division of Masonite) www.stanleyworks.com Steel and fiberglass entry doors
- Weathershield Windows and Doors www.weathershield.com Wood and steel entry doors, with wood, vinyl, aluminumclad, and vinyl-clad frames
- Taylor Building Products www.taylordoor.com Steel (stainable finish) and fiberglass entry doors
- Therma-Tru Doors www.thermatru.com Steel and fiberglass entry doors with optional vinyl-clad jambs
Industry Associations for Windows & Doors
- American Architectural Manufacturers Association (AAMA) www.aamanet.org
- Efficient Windows Collaborative www.efficientwindows.org
- National Fenestration Rating Council (NFRC) www.nfrc.org Sustainable by Design www.susdesign.com
- Shareware calculators for sun angles, solar heat gain, and shading
- Window and Door Manufacturers Association (WDMA) www.wdma.com
-- Adapted and paraphrased, edited, and supplemented, with permission from Best Practices Guide to Residential Construction.
Reader Comments & Q&A
Question:
How To Install Flashing Tape Around Door
(June 17, 2014) j bod said:
I have an exterior door out to a concrete slab. How should the door pan flashing be sealed to the slab? A bead between the flashing and the slab? Or, what is better? Thank you.
I have an exterior door out to a concrete slab. How should the door pan flashing be sealed to the slab? A bead between the flashing and the slab? Or, what is better? Thank you.
Reply:
I use a sealant in that location to guard against drafts & insects.
Question:
(Oct 22, 2014) Ray said:
I have an exterior door that exits to a rooftop (flat roof with roofers felt finish). I used peel and stick flashing for a pan and the flashing is now on top of the exterior deck roof. What I didn't think of was:
I have an exterior door that exits to a rooftop (flat roof with roofers felt finish). I used peel and stick flashing for a pan and the flashing is now on top of the exterior deck roof. What I didn't think of was:
How do I cover the peel and stick flashing that is showing on the doorstep and the flat roof? Thanks,
Reply:
Ray, I may not have a perfectly clear understanding of your question, but most peel and stick flashing materials, similar to ice and water shield, will seal quite well around nails or screws so you can cover exposed peel and stick flashing with any suitable material that works in that location, such as a metal cap flashing under a door, wood trim nailed under a door threshold, etc.
You do want to pay attention to water routing: any flashing needs to be installed so that at its bottom edge it brings water out to the exterior of the surfaces being flashed.
..
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Technical Reviewers & References
- Basic Housing Inspection, US DHEW, S 352.75 U48, p.144, out of print, but is available in most state libraries; New York State version, ca 1955, source of our window parts and window repair sketches.
- Best Practices Guide to Residential Construction, by Steven Bliss. John Wiley & Sons, 2006. ISBN-10: 0471648361, ISBN-13: 978-0471648369, Hardcover: 320 pages, available from Amazon.com and also Wiley.com. See our book review of this publication.
Books & Articles on Building & Environmental Inspection, Testing, Diagnosis, & Repair
- Our recommended books about building & mechanical systems design, inspection, problem diagnosis, and repair, and about indoor environment and IAQ testing, diagnosis, and cleanup are at the InspectAPedia Bookstore. Also see our Book Reviews - InspectAPedia.
- Decks and Porches, the JLC Guide to, Best Practices for Outdoor Spaces, Steve Bliss (Editor), The Journal of Light Construction, Williston VT, 2010 ISBN 10: 1-928580-42-4, ISBN 13: 978-1-928580-42-3, available from Amazon.com
- The Journal of Light Construction has generously given reprint permission to InspectAPedia.com for adaptations, quotations, or reproductions used at this website. All rights and contents of the JLC material are ©Journal of Light Construction and may not be reproduced in any form.
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TRANSCRIPT:
The first steps in the process involve prepping the rough opening. The carpenters have to fill in the extra pieces above the window to flush things out.
How To Use Flashing Tape
Dave: 'We like to install windows over a sloped sill, so we use beveled siding. I'll put a couple of nails in there to hold it in place because we will be shimming the window on this and putting a peel-and-stick membrane on it.'
Some tapes can stretch around corners, but Dave’s going to demonstrate with a standard, non-flexible flashing tape.
Dave: 'You see there's a little piece of plastic inside, like a fishing line.'
First, he splits the release sheet.
Dave: 'Pull that out.'
He works from the center out to either side, keeping the flashing tape along the inside edge of the window.
Dave: 'Later on we're going to put 4 inches of foam on this house. So we'll put another piece [of flashing] on; we want to be able to go out over the 4 inches of foam and turn down.'
Now we can cut the tape—not quite all the way, which leaves a little bit to stretch.
[INSTANT REPLAY]
Dave: 'I'm putting 2 inches to the outside and the rest is going inside.'
Dave wraps the corner, putting only as much peel-and-stick inside the rough opening as the depth of the window. He cuts the bottom, but again not tight to the corner so he can bend the tape around.
Dave: 'The corner is the weakest point—and we've crossed it twice. Then we can put another little piece on that will go over it again. Even though this would be kind of like a reverse-flash, it is already flashed. It's not really a reverse-flash.'
We're giving the corner, the weakest point, triple coverage.