How do I install MortarNet?

You install MortarNet with the dovetail up and the Insect Barrier™ to the exterior of the building.

Is MortarNet suitable for stone veneer cavity wall construction?


Can MortarNet be used in a 3” (76.2 mm) cavity?

Yes, you would use our 1” (25.4 mm) and 2” (50.8 mm) MortarNet with Insect Barrier together in a 3” (76.2 mm) cavity.

Can MortarNet be leaned over in the cavity?

No, MortarNet will not function as designed if leaned over in the cavity.

Can MortarNet be compressed?

Yes, MortarNet can be compressed to fit various cavity widths.

What is an acceptable amount of mortar droppings?

When MortarNet is placed against the flashing, mortar droppings cannot extend above the flashing. If rigid insulation is placed between the MortarNet and the flashing, then mortar droppings can extend above the flashing.

Is flashing necessary if using rigid insulation board?

Yes, flashing is necessary because insulation board is not waterproof.

Can MortarNet be used with metal or flexible flashing at a 45° angle?

Yes, we recommend a bed of mortar behind the flashing at a 45° angle to slope flashing towards the weep vents.


Do you use MortarNet with TotalFlash?

When TotalFlash is used in a masonry cavity wall without continuous rigid insulation, MortarNet is not necessary.  When TotalFlash is used in a design where rigid insulation is placed inside the cavity against the interior wall so the insulation covers the vertical face of the TotalFlash, it may be desirable to install MortarNet between the insulation and masonry veneer to ensure mortar droppings can’t create dams.

Is TotalFlash UV Stable?


Can TotalFlash® be purchased with different individual components?

Yes, termination bars can be PVC or stainless steel. Drip edges can be made in copper, stainless steel, Kynar®-coated metal, and with counterflash details. Membranes include EPDM, Thermoplastic Polyolefin (TPO), Rubberized Asphalt, Stainless Steel, and Copper Laminate.

How do I order special termination bars or drip edges?

Special TotalFlash® is quoted on a per job basis. For more information, call 219-850-4505.

Does Mortar Net Solutions® assist with a TotalFlash® take-off?

Yes.  Please contact Steven Fechino, or 219-850-4514 to take advantage of our free takeoff service.

Are end dams required at all door/window heads and flashing terminations?

Yes, end dams are required at all flashing terminations.

Can Mortar Net Solutions® cut window and door heads to custom lengths?


Can TotalFlash® be used on interior and exterior radiuses?

Yes.  For radiuses, the drip edge is not attached at the factory to the TotalFlash® product.  Drip Edges must be field modified by the contractor and then attached to the TotalFlash®.

Can silicone sealants be used with TotalFlash®?

No, silicone sealants will not adhere to the TotalFlash® membrane. We recommend BTL-1 butyl sealant from Mortar Net Solutions for all membranes. The color of material is not important.

Is TotalFlash® compatible with air barriers and bituminous damproofing?

Yes, TotalFlash® is compatible with all air barriers and bituminous damproofing.

Does TotalFlash® have a warranty?

Yes, TotalFlash® has a 10 year limited warranty.

Are there test results for TotalFlash®?

Yes, please contact our office for specific test results at 800-664-6638.

Can you order the TotalFlash for a left, right, and a middle piece? This would let us do a window restoration head in three pieces to allow us to keep the shoring on the middle the jambs set up. The window is about 10' wide.



Will BlockFlash® work on a wall vertically reinforced on various dimensioned centers?

Yes.  BlockFlash® is designed to work on walls that are vertically reinforced.  The bridge tab on each panel can be snapped off so it will not interfere with the grouted cell.

Can BlockFlash® be used with Half High or Ashler Block?


How often is BlockFlash® installed in a single wythe wall?

BlockFlash® is installed at all flashing levels and at window and door heads.

Does BlockFlash® come in different colors?

No, it only comes in gray.

Can 8” BlockFlash® be cut down to fit 6” CMU?

As of May, 2017, 6” BlockFlash is available for 6” CMU and structural brick. 8” BlockFlash cut to fit 6” CMU or structural brick will not function properly.

Are WeepVent™ needed when using BlockFlash®?

WeepVent are not needed with single-wythe CMU construction.


Can BlockNet® be used to repair an existing wall?

Yes, BlockNet® can be installed post construction for repair or renovation.

Can BlockNet® be used in fully grouted single wythe walls?

Yes, BlockNet® can be installed in a fully grouted wall and will not affect the reinforcing.

Does BlockNet® have special corners?

BlockNet® has stainless steel preformed corners.

Can BlockNet® be used on 6 inch CMU walls?

Yes, it extends to a depth of 3 inches.

What type of sealants can be used with BlockNet®?

Any type of polyurethane elastomeric or polyether sealant can be used.

Where do you run the polyurethane elastomeric or polyether sealant during installation?

Run a bead of caulk along the foundation level underneath the BlockNet®.  Also run 3 perpendicular beads on ends where overlaps occur with the next BlockNet® strip.  (This creates the seal)

Are there any other types of flashing that are recommended or needed with BlockNet®?



How is WallNet® shipped?

0.1875″ (3/16″, 4.7625 mm) thick material:  30′ (.6825 m) x (30.48 m) rolls

0.4″ (10.16 mm) thick material:                       30” (.6825 m) x 50’ (15.24 m) rolls.

1″ (25.4 mm) thick material:                            30” (.6825 m) x 40’ (12.192 m) rolls.

2″ (50.8 mm) thick material:                           30″ (.6825 m) x 20′ (6.096 m) rolls

Is WallNet used only behind stucco and stone veneer?

WallNet can be used in any cavity wall, no matter what the veneer, although its most common application is for residential and small commercial buildings using stucco or thin veneers over stud walls with wood sheathing.  For residential and small commercial buildings with a full-thickness brick or block veneer, use HouseNet, Mortar Net or TotalFlash, depending on the design.

Is WallNet applied continuously throughout the cavity behind stucco or stone veneer, or only at the bottom to catch mortar droppings?

WallNet is applied continuously throughout the cavity so it not only prevents mortar droppings from clogging the weeps but also prevents mortar or stucco from contacting the wall  sheathing and guarantees unrestricted air movement to allow the wall to dry quickly.

Is a weather resistive barrier (WRB) necessary in addition to WallNet?

Yes.  WallNet will not prevent moisture from getting to the sheathing, although it will help it dry quickly if it gets wet.

Won’t moisture penetrate the WallNet and run down the interior wall, which can cause water damage to the interior wall?

Multiple tests by nationally-known Nelson Laboratories in Schaumberg, IL, have shown that, even in the most extreme conditions, water almost never penetrates beyond a fraction of an inch into the cavity.  WallNet’s mesh construction intercepts water droplets before they get to the sheathing and direct it down the cavity to the weeps.

Are flashing and weep holes at the bottom of the wall necessary when using WallNet?

Yes, both are necessary to make sure any moisture than penetrates the stucco or veneer can get out of the cavity and that air can circulate in the cavity to keep it dry.  WeepVent and CellVent by Mortar Net are ideal solutions for keeping weep holes open, and insects and debris out of the cavity.

Does it matter where the first roll of WallNet is installed?

Yes.  WallNet should always be installed from the bottom up, with a minimum of 6” (152.399 mm) vertical laps and 3” (76.199 mm) horizontal laps between sheets.   Be sure to stagger the lap joints.

How is WallNet held in place?

Use staples (min. ½”, 12.7 mm), wrap cap screws or nails every 3 sq. ft.

Does using WallNet help with LEED certification?

Yes.  3/16” WallNet is 40% pre-consumer recycled content, and 0.4” and 1” WallNet are 17% post-consumer and 33% pre-consumer recycled content.

Can WallNet foster or support mold or fungus growth?

Just the opposite.  WallNet’s mesh material will not foster mold or fungus growth, and using WallNet helps prevent the moist conditions in the cavity mold and fungus need.

Will WallNet react with any common building materials?


How long with WallNet last?

WallNet will last for the life of the building.

Will sun exposure harm WallNet?

WallNet is highly UV resistant as well as resistant to normal field temperatures, so it can be stored at a job site and exposed to sunlight during building construction for extended periods without damage.

Is WallNet flammable?

WallNet meets Federal Flammability Standard 191A, which requires that a horizontally placed specimen will not burn faster than 4”/minute.


Can WeepVent be used with CMU Veneer?

Yes, just tuckpoint the head joint above the WeepVent.

Can WeepVent be used with cut stone?

Yes, WeepVent can be used with cut stone, natural stone, and terra cotta.

Can WeepVent be used with brick sizes other than modular brick?

Yes, WeepVent comes in 6 sizes.

Can WeepVent be used with metric materials?

Yes, WeepVent are available in metric dimensions.

Will WeepVent fade or degrade?

No, WeepVent is UV stable.

Will there be any reaction if using a silicone sealant?

There will be no adverse effect to a silicone sealant.

Can plastic tubes in an existing building be removed and replaced with WeepVent?

Yes, cut the joints, remove the plastic tubes, and install WeepVent with a screwdriver by gently pushing them into the open head joint.


Can CellVent be used with C.M.U. Veneer?

Yes, just tuckpoint the head joint above the CellVent.

Can CellVent be used with cut stone?

Yes, CellVent can be used with cut stone, natural stone, and terra cotta.

Can CellVent be used with brick sizes other than modular brick?

Yes, CellVent comes in 2 sizes.

Will CellVent fade or degrade?

No, CellVent is UV stable.

Will there be any reaction if using a silicone sealant?

There will be no adverse effect to a silicone sealant.