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Successful Through Wall Flashing Systems PowerPoint PPT Presentation


Successful Through Wall Flashing Systems Prepared by: Lennel Specialties Corporation www.lennelspecco.com Edited by: Richard Keleher The Problem This problem can lead to: Damage to interior finishes Tenant discomfort and complaints

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Successful Through Wall Flashing Systems

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Successful through wall flashing systems l.jpg

SuccessfulThrough Wall Flashing Systems

Prepared by:

Lennel Specialties Corporation

www.lennelspecco.com

Edited by:

Richard Keleher


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The Problem

This problem can lead to:

Damage to interior finishes

Tenant discomfort and complaints

Indoor air quality problems due to mold and fungus growth

The age old problem that the construction industry has been faced with is moisture infiltration in its liquid form into building exterior walls and interiors due to through wall flashing failures.

Damage to the structural elements of the building

Efflorescence

Loss of clients

Litigation

Owners are no longer putting up with leaky buildings. 80% of construction litigation is due to moisture infiltration problems.


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Corroded light gage metal framing back up systems.


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Corroded relieving angles.


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Mold growth in exterior wall insulation.


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Efflorescence


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The Solution

Design

Detailing

Consider carefully

Materials

Workmanship

Coordination


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Design

Don’t design a building that cannot be effectively or efficiently waterproofed


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Ten Cambridge Center Cambridge, MA


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Detailing

Use three dimensional details for corners, panning and other intricate details.

Think about where the moisture is going to flow when drawing details.

Details should be clear and complete.

Make sure your details get the moisture out past the face of the wall.

CAD makes detailing so much easier. A library of details can be developed to detail most conditions on most jobs.


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Is this a “ through wall “ flashing ?


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Materials

Copper Core Composites

Copper with asphalt saturated kraft paper

Asphalt coated copper

Copper fabric flashing

Benefits / Problems

Will last a long time

Hard to work with in the field

How long will the lap sealant last?

Not compatible with sealants


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Copper composite flashings are difficult to lap effectively.


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Copper fabric flashing at sill application


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Materials

PVC

Excellent material to work with, but…..

Plasticizer migration will cause it to become brittle and crack over time

Not UV resistant

Not resistant to some solvents

Not very durable

AIA/ Masterspec dropped it from their specifications in 1999


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Torn PVC flashing


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Materials

EPDM

+ / - 60 mil membrane hard to bend, fold & lap

Adhesive application causes some problems

Note: EPDM is now available in 40 mil thickness and can be sealed, lapped and embedded in mastics and mastic type products.

Self Adhering Flashing

Self sealing at splices, punctures and penetrations

Cannot withstand prolonged exposure to UV rays

Not compatible with sealants

Keep material back 1/2” from the face of the wall

Do not bridge gaps greater than 1/4” wide


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Self adhering flashing oozing its rubberized asphalt


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Materials

16 oz. Lead Coated Copper

Will last a long time

Excellent for forming end dams and corners

Not adaptive to job site conditions

Very expensive to purchase and install

( + / - $ 10.00 / sf = + / - $ 2.00 / sf of brick veneer )

Can leach a white residue

Lap and joint treatment must be considered

Stainless Steel

Will last a long time

Hard to solder for end dams and corners

Not adaptive to job site conditions

Very expensive to purchase and install

( + / - $ 15.00 / sf = + / - $ 2.50 / sf of brick veneer )

Can reflect sunlight depending on finish


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External Corner


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Internal Corner


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Why is my building leaking???


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Workmanship

To help avoid these problems:

Use clear, concise and complete details

Choose user friendly materials

Have a pre-construction envelope meeting with:

90 % of flashing problems are due to poor workmanship

The general contractor

The cladding (masonry) contractor

The metal stud contractor

The window contractor

The sealant contractor

The air barrier & flashing installers


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Mortar Net™ weep baffle.


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Stepped “ through wall “ flashing.


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Wall flashed to weep inside the building.


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Typical: Use Mortar Net!

Typical: Provide Insulation (Angle should be on Brackets)

Typical: Use Backer Rod to Allow for Deflection


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Typical: no insulation!

Now this works!!!!!


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Typical: LCC or SST for Whole Flashing


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Why is my building leaking?


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Typical: Use Metal Flashing with End Dams

Typical: Air + Vapor Barrier (dotted)


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Masonry opening jamb.


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?


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Self adhering jamb flashing that did not stay adhered.


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Typical: Add Jamb Flashing


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Damn!!!! No end dam. We have a leak.


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