Description
The widest flashing Typar makes
Twelve inches is the top of the TYPAR flashing line. The Flexible stops at 9 inches; the Butyl keeps going to 12. If the detail is wide, this is the only Typar roll that covers it in one piece.
Typar aims this width at a specific problem, and it is worth quoting them: wide-width Butyl is “ideal for protecting those pesky inside and outside corners, where cladding installation has a greater chance of impacting the weather-resistant barrier.”
Why corners want width
Two things happen at a corner. First, the geometry: tape bent around a corner splits its coverage between two planes, so a 6-inch roll lands about 3 inches per face and a 12-inch roll lands about 6. Second, and the reason Typar calls the corners “pesky” — corners are where the siding crew works hardest. Starter strips, corner boards, nailing, trimming: the weather barrier at a corner takes more abuse during cladding than anywhere else on the wall.
Six inches per face gives that abuse somewhere to land without reaching bare sheathing.
| Detail | Why the 12-inch |
| Outside corners | ~6 in per face, one piece, no seam in the bend |
| Inside corners | Same, and the corner stays covered while trim goes on |
| Band joist and floor-line transitions | Lands on the rim and the sheathing above with lap left over |
| Deep sills and wide heads | Covers the full depth of a 2×6 rough sill and still turns up |
Same tape, more of it
This is the identical butyl as the 6-inch roll — same 15.5-mil build, same polyethylene facer, same 30°F to 180°F range, same 6-month UV limit. Only the width changes, and with it the price per roll and how many rolls come in a case: 4 per case here, against 8 for the 6-inch.
Buy the 12-inch for the corners and the wide transitions. For flanges and straight sheathing joints the 6-inch does the same job for less per foot — most crews carry both.
Specifications
| Type | Self-adhered butyl flashing, peel and stick |
| Total thickness | 15.5 mils (facer 6.2 + adhesive 9.3) |
| Facer | Polyethylene barrier, gray |
| Adhesive | Butyl rubber copolymer — no asphalt |
| Size | 12 in × 75 ft (1 roll) |
| Application temperature | 30°F to 180°F |
| UV exposure limit | 6 months |
| Release liner | Single or split-back |
| Grab tensile (ASTM D-5034) | Pass — 55 lb/in |
| Peel adhesion | Plywood 7.2 · facer 6.9 · OSB 2.8 (lb/in) |
| Nail sealability | Pass (ASTM D-1970) |
| Factory case | 4 rolls |
| Manufacturer | TYPAR — Magnera (formerly Berry Global), made in the USA |
| Condition | New, factory sealed |
How far 75 feet goes
Corners run floor to plate, so wall height sets the yield:
- 8 ft walls: about 9 corners per roll
- 9 ft walls: about 8 corners
- 10 ft walls: 7 corners
A simple rectangular house has four outside corners, so one roll covers the corners on a single-story plan twice over. Articulated plans are the ones that eat it — every bump-out adds two more corners, and a plan with six offsets can run through a roll on corners alone.
Installation notes
You need:
- A dry, clean substrate free of frost, dust and loose fasteners
- A roller — on a corner, seat the bend first, then work out to each face
- Surface and air at 30°F or above
- Primer (3M Super77 or equivalent) where the substrate is marginal
- Shingle-lapped sequencing so water always runs over a joint, never into it
Remember the OSB number: 2.8 lb/in against 7.2 on plywood. A 12-inch piece has a lot of surface area to seat, and the corner is the worst place to leave it half-rolled.
Contractor and volume pricing
Buying corners by the pallet? Call (832) 463-7946 or email sales@85builders.com with your quantity and the job-site ZIP code and we will send pricing the same business day.
We accept Texas resale certificates for tax-exempt purchases.
Frequently asked questions
Is the 12-inch a different tape from the 6-inch?
No. Same butyl, same 15.5-mil build, same ratings. Only the width and the case count differ — 4 rolls per case here, 8 for the 6-inch.
Does TYPAR make a 12-inch flexible flashing?
No. The Flexible Flashing tops out at 9 inches. Past that width, butyl is the only Typar option.
Can I use it on a curved detail?
No — flat butyl wrinkles on a radius, and at 12 inches it wrinkles more. Curves belong to the Flexible.
How cold can I install it?
30°F, same as the rest of the Butyl line. Below that, use a flashing rated colder.
What about the 180°F top end?
That is genuinely useful in Texas. A dark wall in July gets far hotter than the air, and asphalt-based flashings soften and bleed where this one does not.
How fast does it ship?
We ship next business day from Cypress, TX.
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