FLASHING
FOR MASONRY WALLS
|
FLASHING
FOR MASONRY WALLS
|
HOME |
ARCHITECTURAL HOME | PRODUCTS | DATA
SHEETS | MSDS's | SPECS | DETAILS | SHOWS & EVENTS | GREEN
/ LEED | WARRANTY | CONTACT
US |
||||
 |
||||
THE
POLYGUARD FLASHING SYSTEM |
||||
Many manufacturers produce flashing products, but no manufacturer produces a flashing system as complete as the Polyguard Flashing System. Polyguard has prepared a brochure titled The 7 Deadly Sins of Masonry Flashing. This brochure discusses seven common reasons for flashing failures. Below is a summary of the "7 Deadly Sins" and how the Polyguard Flashing System addresses each of them. |
The
7 Deadly Sins of Masonry Flashing |
Discussion |
Polyguard's
Solution |
1.
Flashing Brittleness |
The late Clayford T. Grimm, highly respected masonry forensic engineer, said: "PVC
is not durable, loses its plasticizer, Warm cavity temperatures accelerate PVC's instability |
Polyguard's
flashing materials are made from polyethylene film and rubberized
asphalt. Neither of these materials will embrittle under cavity wall
conditions. |
2. Leakage at Ends of Flashing  |
Grimm also says: "Four out of five text books for the vocational education of masons...do not mention end dams, or the fabrication of exterior or interior corners where most leaks occur." 2 |
Polyguard has prefabricated "…self adhesive flashing corners and end dams..are ideal for details which require that the flashing is adhered to structural steel members ." 3 |
 |
||
3.
Defective Seams at Flashing Overlap  |
Conventional
flashing systems usually rely on construction labor to "mastic
in" complete and flawless seams. The result can be leaks at
fishmouths and imperfect seams |
Polyguard
flashing has self - adhesive seams for instant overlap integrity. |
 |
||
4.
Leakage at Corners  |
Walter
Laska's authoritative book says:
"It is difficult to install flashing successfully at corners, particularly
outer corners…..even if a mason properly cuts, folds, and laps
flashing…pinhole openings and gaps (known as fishmouths) exist." 4 |
Prefabricated, self - adhesive inside and outside corners "Prefabricated flashing corners are easy to install and provide
optimum protection from moisture infiltration." 5 |
5.
Loose Laid Flashing Allows Water Behind  |
Loose
laid flashings, bent, draped, or hung across the structure, are vulnerable
to water leaks through bad seams or punctures. Once behind the loose
laid flashing, water moves freely. |
Polyguard's
flashings, end dams, and corners are all directly adhered to the
structure.
"…this
creates a watertight seal. This type of flashing (rubberized asphalt
self-adhering)
also will prevent
water
from migrating
under the
flashing and into the |
 |
||
6.
Mortar Droppings Block Weepholes  |
Mortar droppings from the exterior wythe, landing on the flashing block fugitive water from reaching weepholes. |
Polyguard
Termi-Net™ is a stiff geotextile netting. Fabricated in a
teardrop shape, it blocks mortar droppings while allowing fugitive
water to
flow through, behind, and underneath. Additionally, Termi-Net™ acts
as a Termination system; fasteners can be installed through it to
secure the flashing to the inner wythe. |
7.
Confusion Between Trades  |
In
many parts of the U.S., thruwall flashing has been specified in Division
7. Often, one contractor purchases material, a second fabricates
it, and a third (the mason) installs it. This is a recipe for cost
runups plus job and quality problems. |
Polyguard's
Flashing System is a mason - friendly system, and is recommended
to be specified in Division 4. |
| Footnotes: 1. Grimm, Clayford T:, "The Hidden Flashing Fiasco", Construction Research Center of the University of Texas at Arlington, Arlington, TX, 1994, p. 11 2. Grimm, Clayford T:, Ibid, p. 6 3. Laska, Walter: Masonry and Steel Detailing Handbook, the Aberdeen Group, Addison, IL, 1993, p. 95 4. Laska, Walter; Ibid, p. 95 5. Laska, Walter; Ibid, p. 95 6. Laska, Walter; Ibid, p. 132 |
||
COMPONENTS
OF
POLYGUARD'S THRU WALL FLASHING SYSTEM |
SELF-ADHESIVE
FLASHINGS
|
|||||
Polyguard's Thru Wall Flashings are used in exterior masonry wall systems to deflect water from thru wall penetrations. Applications include spandrel beams, sills, copings, door and window headers and flange flashings. Polyguard Thru Wall Flashing collects water that penetrates inside the exterior wythe and directs it back to the exterior through weepholes. Polyguard has three flashing materials. All are 40 mils in thickness. They are:
|
|||||
Data
Sheet  PDF:137KB-3Pgs. |
Guide Specs | Details | MSDS | ||
 |
|||||
|
|||||
| Data
Sheet PDF:142KB-2Pgs. |
Guide Specs | Details | MSDS | ||
|
|||||
| Data
Sheet PDF:111KB-2Pgs. |
Details | MSDS | |||
 |
Polyguard
Preformed Self-Adhesive End Dams |
|||
If you agree with Grimm's conclusion that end dams must be placed wherever flashing terminates, you will appreciate Polyguard's end dams, which replace the time consuming and error prone field installation with a simple unfold, peel, and stick installation. Polyguard Preformed Self-Adhesive End Dams are fabricated from 400 Thru Wall Flashing they also serve in protection of inside corners. End Dams are available in 3" x 3" x 3", 6" x 6" x 6", and 8" x 8" x 8" sizes (8" also used as inside corners). |
||||
| Data
Sheet PDF:123KB-2Pgs. |
Details | MSDS | ||
For the protection of outside corners, another major leakage area, Polyguard's Preformed Outside Corners should be used. Outside Corners are available in 7" x 7" x 8". For the protection of inside corners Polyguard Preformed Self-Adhesive End Dams should be used. Polyguard Preformed Self-Adhesive Corners and End Dams are fabricated from 400 Thru Wall Flashing. End Dams (inside corners) are available in 8" x 8" x 8". |
||||
| Data
Sheet PDF:130KB-2Pgs. |
Details | MSDS | ||
 |
To prevent the blocking of drainage by mortar droppings, the system's unique teardrop shape does several things differently:
|
|||
| Data
Sheet PDF:133KB-2Pgs. |
Details | MSDS | ||
Used
for
(X-Required, O-Optional) |
ACCESSORY
ITEMS USED WITH POLYGUARD FLASHINGS
|
|||||
Flashing
|
Corners & Ends
|
Name of Accessory | Data
Sheet
|
Links
|
||
O
|
O
|
650 LT liquid Adhesive | MSDS Index |
Details Index |
Guide
Spec Index. |
|
X
|
O
|
650 Mastic | ||||
.O
|
.N/A
|
Stainless Steel Drip Edge | PDF:
142KB, 1Pg. |
|||
| . | Polyguard Estimating Guide Sheet |
.
|
||||
Home / Architectural / Highway / Pipeline / Mechanical / Residential / © 2005 Polyguard Products, Inc. All Rights Reserved. |
|
