Description
What it is — and when 6″ is the right width
DuPont Flashing Tape is a self-adhered flashing made with a 100% butyl adhesive layer, engineered to seal the joint between the rough opening and the water-resistive barrier. No asphalt, no modified bitumen — pure butyl on a polypropylene film, with a heavy-duty split release liner so you can set it in two passes without wrinkles.
The width decides the job:
- 4″ — sheathing seams, narrow jambs, trim details
- 6″ — standard window jambs and heads. The width you go through fastest on a house, because every opening needs two jambs and a head
- 9″ — window sills and mid-size openings
- 12″ — wide sills, door pan flashing, large openings
On a standard residential job, 6″ on the jambs and head paired with 9″ on the sill covers the great majority of your openings. If you are ordering for a whole house, order more 6″ than anything else.
Specifications
| Adhesive | 100% butyl (no asphalt or modified bitumen) |
| Backing | Polypropylene film |
| Release liner | Heavy-duty siliconized paper, split design |
| Size | 6 in × 75 ft (1 roll) |
| Application temperature | Down to 25°F (-4°C) |
| UV exposure | Up to 120 days |
| Primer | Not required on most common building materials |
| Factory carton | 4 rolls |
| Condition | New, factory sealed |
Standards and warranty
| AAMA 711 | Class A, Level 3 — highest classification |
| ASTM E1677 | Assembly air leakage < 0.04 cfm/ft² |
| ASTM E331 | No water leakage at 300 Pa (6.24 psf) |
| ASTM E96 | Water vapor permeability < 1 perm |
Backed by DuPont 10-Year Limited Warranties when installed as part of the Tyvek® WRB system.
Installation notes
You need:
- A clean, dry, frost-free surface
- Jambs flashed after the sill, head flashed last, shingle-lapped so water runs out and not in
- A chemically compatible primer over concrete, masonry, and glass-mat exterior gypsum sheathing
Do not use it for:
- Through-wall flashing applications
- Installing over cap fasteners
How many rolls you need
75 ft per roll. Quick math for jambs and head on a standard 3 ft × 5 ft window (two 5 ft jambs plus a 3 ft head, about 15 ft with laps):
- Roughly 5 windows per roll
- A house with 12 to 15 openings: plan on 3 rolls of 6″
This is the width that runs out first. If you are ordering once for the whole job, weight your order toward 6″.
Same roll, lower price: clearance stock
We keep a few rolls whose packaging took a beating in storage. The tape inside is factory-sealed and carries the same DuPont 10-year limited warranty as a new roll — only the carton looks rough.
- DuPont Flashing Tape 6″ × 75 ft — clearance — $32.99 instead of $41.99, while stock lasts
Contractor and volume pricing
The factory carton is 4 rolls. Call (832) 463-7946 or email sales@85builders.com with your quantity and the job-site ZIP code and we will send carton pricing the same business day.
We accept Texas resale certificates for tax-exempt purchases.
Frequently asked questions
Is this genuine DuPont?
Yes. New, factory-sealed product in original DuPont packaging. Not generic, not repackaged.
Do I need a primer?
On most common building materials, no. You do need one over concrete, masonry, and glass-mat exterior gypsum sheathing — use a chemically compatible primer.
Can I install it in cold weather?
Down to 25°F (-4°C). Below that the butyl will not bond reliably and you will get failures.
How long can it stay exposed before the wall is closed in?
120 days of UV exposure. If the schedule runs longer than that, it needs to be covered.
Can I use it for through-wall flashing?
No. DuPont specifically excludes that application.
How fast does it ship?
We ship next business day from Cypress, TX.
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