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Tyvek Installation Behind Brick Veneer
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Re: Tyvek Installation Behind Brick Veneer By  paul curry

Posts: 0

8/23/2009 2:10:00 PM

Did it get inspected/passed prior to installation of veneer?


   

Re: Tyvek Installation Behind Brick Veneer By  SCcontractor411

Posts: 0

8/23/2009 2:37:00 PM

The area this home was built in has rough in inspections the house has to be dried in but the tyvek was not installed at that point so no the installation of the tyvek was not inspected prior to the laying of the brick.


   

Re: Tyvek Installation Behind Brick Veneer By  Louis Marks

Posts: 0

8/23/2009 4:21:00 PM

What goes up in this case must come down. Tyvek (house wrap) is acting both as moisture barrier and draft barrier. Residential masonry work typically has poor cleaning of mortor in the cavaity as well. Window flashing n eeds to be inspected as well.


   

Re: Tyvek Installation Behind Brick Veneer By  Boo1

Posts: 0

8/24/2009 6:31:00 AM

What does the installation instructions say about orintation?


   

Re: Tyvek Installation Behind Brick Veneer By  GrayHeadedMule

Posts: 0

8/24/2009 6:35:00 AM

There was a discussion on this a while back. Same scenerio....The manufactuer gave a letter stating that type of installation was okay.

You may want a letter from Tyvak.

I''m wondering why they didn''t inspect the brick ties? I guess some AHJ''s don''t perform that inspection! We do just for that reason. We inspect window flashing, any other flashing issues, and ties at the same time


   

Re: Tyvek Installation Behind Brick Veneer By  Speccman in CT

Posts: 0

8/24/2009 7:37:00 AM

Standard "Tyvek HomeWrap" is not a true barrier and allows wall assemblies to ''breathe'' (air and water vapor pass through slowly over time). But it is designed to direct liquid water, if it should penetrate behind the siding, to run down the face and, if the design is good, out of the cavity without wetting the wood sheathing or framing.

So long as the fabric courses are ''shingled,'' i.e., upper course overlaps the course below - and that course overlaps the one below that - liquid water should flow correctly whether the courses are installed horizontally or diagonally. If you had thrown a cup of water at the top course, would it have run down the face without getting behind the Tyvek? If so, you may have the equivalent of the manufacturer''s recommended installation method as far as performance is concerned and can accept the diagonal layout as providing the desired performance.

Tyvek info site: http://www.home-siding-info.com/tyvek-advantages.html


   

Re: Tyvek Installation Behind Brick Veneer By  SCcontractor411

Posts: 0

8/24/2009 5:50:00 PM

Has anyone had any problems in their areas where the sheathing was rotting behind the Brick veneer? If tyvek breathes and allows moisture to penetrate through as Speccman is talking about why would it be allowed to be used instead of 15lb felt? Seems like Tyvek would make the problem potentially worse, Thanks.


   

Re: Tyvek Installation Behind Brick Veneer By  Uncle Bob

Posts: 0

8/24/2009 6:10:00 PM

Tyveck is a semi-permeable membrane that allows the passage of air but not water; like my Frog Toggs, that I love because the allow the air to keep me cool while keeping me dry.

Here is complete information from Dupont on their product; including proper installation instructions;

http://www2.dupont.com/Tyvek_Weatherization/en_US/index.html

However, improperly installed; which is unfortunately normal; Tyveck does more harm that good.

Uncle Bob


   

Re: Tyvek Installation Behind Brick Veneer By  DRP

Posts: 0

8/24/2009 7:10:00 PM

I''m working on a job where I''ve uncovered some ~20 yr old tyvek. In 20 years it won''t really matter which way that stuff was installed...


   

Re: Tyvek Installation Behind Brick Veneer By  SCcontractor411

Posts: 0

8/25/2009 3:48:00 AM

DRP what was the condition of the sheathing behind the tyvek? And Uncle Bob why is it your opinion that improperly installed tyvek does more harm than good? I''ve heard someone else say that, it seems like if it does stop misture from getting through some protections would be better than never installing it, I''m just curious, thanks.


   

Re: Tyvek Installation Behind Brick Veneer By  DRP

Posts: 0

8/25/2009 5:14:00 PM

SC, this has cedar bevel siding, looks like over mostly celotex. We haven''t unsided much yet. Haven''t seen evidence of water getting to the tyvek anywhere yet. We will strip and reside 2 dormers as part of a new roof tie in. I''ll post what we find. What prompted my comment, we removed the soffit from one side, the tyvek extended up the wall behind it to the plate. It had come off the wall and was laying in the soffit. Many tears and ragged. I lifted a section and was going to nail it back up, it tore like lightweight paper, I''m sure you know the stuff is about untearable when new. I''ve heard the same thing from others who have been into older work. I''ve realized I cannot say how long this was exposed prior to cover and I remember the early stuff said it had to be covered within 30 days. I believe the product has changed in this time, so there''s that to consider.

I like the concept of covering alot of wall with an air barrier sheet but I''m not sold yet that it will hold up long term. I''m listening if others have differing experience. When it is misinstalled IMO you have a huge funnel directing and holding water against the sheathing side. It is more difficult to shingle lap sheets that wide around wall penetration flashings where 3'' wide tarpaper is easier to lap correctly. It is certainly possible to do it right.

In my mind tarpaper is pretty high tech, being made from wood fiber it shrinks and swells with moisture change. When its dry the asphalt impregnated fibers shrink and create pores that allow trapped vapor to escape. When wetted it absorbs some of the moisture, rapidly expands slamming the asphalt impregnated fibers against each other and becomes watertight. It has absorbed some of the problem preventing it from getting to more sensitive materials and it has changed from vapor permeable to waterproof. I haven''t seen any of the newer products that can do that yet. Since they repel water they force it into the sheathing or siding raising their moisture content. Just my take on things.


   

Re: Tyvek Installation Behind Brick Veneer By  SCcontractor411

Posts: 0

8/27/2009 4:29:00 AM

I appreciate all of your input with this, thanks, Sharon.


   

Re: Tyvek Installation Behind Brick Veneer By  stuccoman

Posts: 0

8/28/2009 6:39:00 AM

What about where the mortar touches the tyvek behind the brick and renders it useless?


   

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