Determining what moisture barrier product to use

Exterior Insulation and Finish System Installation Process

Determining what moisture barrier product to use

There are several moisture barrier products out there these days and determining which one to use has a lot to do with what type of EIFS application you are going to be using. Are you going to be applying over OSB, Brick, a Block wall. The budget can also a determining factor. There are two good products which are; a rolled on air and moisture barrier and a wrap. The wrap is known as StuccoWrap® which is a lot like traditional Tyvek® , but it has ridges in it to help drain moisture. And the rolled application which all manufacturers have a version of. I personal like to use Senergy’s Senerg-Shield-R® version of the product. Either way you go they both work great. It is mandatory that you use Stucco Flashing Tape around the windows and doors. Stucco tape is a moisture barrier tape that is a rubberized asphalt membrane and it’s top layer is polyester which Alpha Base Coat adheres to very well.

Sener-Shield-R®

  • DensGlass Gold®
  • OSB
  • Block Wall
  • Brick

Stucco Wrap

  • OSB
  • DensGlass Gold®

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Apply EPS foam to the substrate

Exterior Insulation and Finish System installation process

There are several ways to apply the eps foam to the substrate. But, before doing so, we need to take a few things into consideration. First, is the substrate itself. There are different applications for different substrates. Here is a list of the more common exterior insulation and finish system substrates.

  • OSB (oriented strand board)
  • T1-11
  • DensGlass / Glass Roc
  • Block Wall
  • Brick

Applying the eps foam over Block, Brick and DensGlass is very similar. The polystyrene insulation board is attached to the substratewith Alpha Base Coat.

The Base Coat is applied to the foam with a notch trowel in a vertical motion which allows for moisture  drainage. All windows and doors should be back wrapped and a 1/2 inch expansion around them. Note; if the block or brick are painted a primer must be used before applying the eps foam to the wall.

When applying eps foam over OSB or T1-11 the process is much different. First the wall is covered with a moisture barrier called stucco wrap. Then the foam is attached to the wall with mechanical fasteners. again, all windows and doors should be back wrapped and a 1/2 inch expansion around them.

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