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Weep-Net™ – Changing the Game!

Boxed Mortar Netting

York’s Weep-Net™

600+ Sq. Ft. of cardboard per pallet! No Cardboard = Less waste, labor & dumpster fees
(20) 5′ pieces per box, 24 boxes per pallet (20) 5′ pieces per bundle, 24 bundles per pallet
Pallet Size:  42″ Wide, 61″ Deep, 81″ High Pallet size:  42″ Wide, 48″ Deep, 65″ High
Pallet size requires higher, deeper racking Pallet size fits standard racking
16,800 sq. ft. of carboard per truckload Environmentally friendly = No Cardboard!

316 Stainless Steel Press Release


Contact: Customer Service at York Manufacturing, Inc., Sanford, Maine

Phone: 1-800-551-2828




SANFORD, Maine – York Manufacturing, Inc., has introduced the type 316 series of flexible stainless steel flashings for coastal areas. The 316 series has a significantly higher resistance to “salt” corrosion found within a half mile of the ocean and offers better chemical resistance than the typical 304 series stainless steel. Available in self-adhering, stainless steel fabric and as a drainage plane combination flashing in both the 304 stainless steel and the 316 stainless steel.

Copper Fabric Compatability

Is your copper fabric flashing compatible?

Copper fabric flashing has great longevity, puncture resistance and tear resistance, which are facts that have been known for over the 70 years since York invented copper fabric flashing in 1935.

Why did York stop making their copper fabric flashing with asphalt?  Compatibility!

Asphalt coated copper fabric flashing is coated with Mica dust, which keeps the asphalt from sticking to itself while the product is in a roll, so the downside is:
*Air barriers and polyurethane spray foam insulation systems need a clean substrate to adhere to.  No air barrier systems, to the best of our knowledge, have been approved the use of asphaltic copper fabric flashing with their system.
*Sealants need a clean substrate and the Mica dust diminishes the adherence.
*Weight:  a roll of asphaltic copper fabric flashing is heavy due to having Mica dust coating both sides of it; causing shorter rolls, which means more lap joints.

Asphalt was originally used for copper fabric flashing in 1935 because it was a readily available and inexpensive adhesive.  The building envelope has dramatically evolved in this time and the drawbacks to using asphalt are:
*Asphalts from different sources should always be tested for compatibility with each other, since there are many components that make up asphalt.

Refer to CSI article:
*Oil in bituminous products are known to migrate and/or cause incompatibility reactions.  An oliensis test (ASTM D-1370) should be conducted on any project that includes asphaltic copper fabric flashing.

Many architects are not comfortable requiring the Asphaltic CFF beyond the face of the brick, since the asphalt will emulsify and stain the brick veneer.  A drip edge is often recommended, which increases components and cost to the project.
*Cold: asphalt does not form on the jobsite well below 40-50 degrees
*Heat: asphalt starts to soften and change chemical composition at 80 degrees, so hot days in the summer it is difficult to work with.

Mastic is the recommended sealant for asphalt coated copper fabric flashing.
*Mastic is 60 – 80% petroleum asphalt and 20 – 40% of mineral spirits (solvent):
*Solvents are not recommended to be in contact with Polystyrene foam boards: either expanded or extruded.
*Think of a foam cup and gasoline…not a good combination

Non-asphaltic copper fabric flashings are:
• Compatible with all known air and vapor barrier systems,
• Compatible with all polyurethane spray foam insulation systems and common construction sealants
• Clean working surface
• 60% of the weight of asphaltic copper fabric, so the rolls are longer for less lap joints
• Can be run to the exterior face of the brick, so no drip edges are needed
• Flexible down to -25 degrees F and is stable to 275 degrees F
• Approved for use with all known cavity wall sealants and construction materials

Non-asphaltic copper fabric flashings are manufactured by:
• York Manufacturing Inc. :  Multi-Flash 500/ Flash-Vent

NFPA 285 Tech Letter

NFPA 285:  Insulation and Water Resistant Barriers

The International Building Code (IBC) in 2006 required that all wall assemblies containing plastic foam insulation products pass the NFPA 285 requirements.  The 2012 version extended beyond the insulation products to include all combustible weather barriers, which include through-wall flashings.  The IBC does not define combustible, so the general interpretation is that anything that is not specifically proven to be non-combustible is considered to be combustible.

What this means to the industry:

  • With ASHRAE 90.1 leading the way and all of the organizations (IBC, IgCC, IECC, and USGBC’s LEED) insisting on better energy efficiency, we are going to have insulation in all of our cavity walls soon.
  • NFPA 285 will be required for these walls (the significant changes for 2012 stated above).  To date:
    •     No asphalt based air barrier has passed the NFPA 285 test 
    •     No rubberized asphalt (Peel & Stick) flashing has passed ASTM E84 
    •     In light of the NFPA 285 tests, flashing is becoming a major issue and investigated more closely

What this means to you:

  • To date, there are only 3 companies that have flashings that pass the ASTM E84:
    • Carlisle’s new 705FR, which is a foil faced and fire retardant butyl peel & stick
      • The price is 3 to 4 times higher than rubberized asphalt.
    • STS Coatings new Wall Guardian TWF
    •      York Manufacturing: 
      •       Flash-Vent copper and stainless steel:  Class A
      •       Multi-Flash copper: Class B
      •       Multi-Flash stainless steel:  Class A
    • Also, traditional sheet metal flashings automatically passes:
      •   The transition details to the backer wall must be addressed, since rubberized asphalt flashings have not passed.

When is this going into effect:

Some states, like Pennsylvania, adopt the codes automatically and others are a version or two behind. No matter what state you are designing buildings in, your building envelope will have to pass NFPA 285 very soon, so including components that have passed ASTM E84 is a must.  

A great resource to get more in depth with what NFPA 285 is and what is happening with it, then you should check out the NFPA link on the BETEC page of LinkedIn.  Also on LinkedIn are the Air Barrier Technologies Knowledge Forum and the Air Barrier Association of America.

This tech note was written with the most current information at the time of publication and all information is accurate to the best of our knowledge.