Weep systems

Masonry Construction, March, 2004

Mortar Net USA Ltd.

These weep vents are constructed of recycled polyester, are 90% open mesh, and are bonded with flame-retardant adhesive. They come in six different colors to match mortar: white, brown, tan, red, gray, and almond.

* Mortar Net USA Ltd., 800-664-6638, www.mortarnet.com

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York Mfg. Inc.

Composed of polypropylene, these weep vents are offered in two standard colors: gray and clear. Two sizes are available: 3/8 x 2 1/2 x 3 3/8 inches and 3/8 x 3 1/2 x 3 1/2 inches.

* York Mfg. Inc., 800-551-2828, www.yorkmfg.com

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Masonry Technology Inc.

These weeps create a void in the head joint of mortar at the lowest point of the cavity of at the top of the flashing. The weeps serve as spacers and are easy to install. Place a weep every 16 inches of in every other head joint of common brick.

* Masonry Technology Inc., 800-879-3348, www.masonrytechnology.com

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Williams Products Inc.

This injection-molded brick vent is made of flexible PVC formed in an offset "T" shape. When inserted in vertical mortar joints between two brick, the slotted leg of the vent permits air to pass in and out, allows water to weep out, and blocks moisture from penetrating.

* Williams Products Inc., 800-521-9594, www.willamsproducts.net

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Heckmann Building Products Inc.

The cavity vent weep system creates a number of openings at the lowest point of the cavity or core of the wall. It forms the bottom side of the mortar's bed joint, and its 3/16-inch thickness does not affect the normal layout. It creates four vent holes every 9 1/2 inches on the entire perimeter.

* Heckmann Building Products Inc., 800-621-4140, www.heckmannbuildingprods.com

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Hohmann & Barnard Inc.

Weep holes are made of injection-molded flexible PVC (model 343) of painted aluminum (model 343W). The configuration of the louvers directs the movement of water from the cavity to the outside of the building while preventing the reverse passage of water. The design permits air to enter the cavity, which aids pressure equalization and reduces suction.

* Hohmann & Barnard Inc., 631-234-0600, www.h-b.com

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Dur-O-Wal.

The D/A 1006 cell vent weep hole ventilator ensures that moisture entering or exiting the wall cavity passes over the exterior veneer rather than dropping into the core, which can cause efflorescence or spalling. The shape keeps the space between the masonry units free of mortar. The outside face is installed 1/8 inch flora the masonry unit.

* Dur-O-Wal, 800-323-0090, www.dur-o-wal.com

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Advanced Building Products Inc.

Mortar Maze weep vents ensure positive drainage in all cavity wall construction. The vents are made from polypropylene and come in four colors--clear, tan, brown, and gray--to match the surrounding mortar.

* Advanced Building Products Inc., 800-252-2306, www.advancedflashing.com

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Wire-Bond

This cell vent consists of several small, adjacent passageways bonded together in one unit. The product's cellular composition provides easy drainage for moisture along the full height of the head joint. The standard unit measures 3/8 x 2 1/2 x 3 3/8 inches, and comes in four colors: clear, gray, tan, and brown.

* Wire-Bond, 800-849-6722, www.wirebound.com

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