EIFS Minimum Requirement For EPS Foam Thickness

Did you know there is a EIFS minimum requirement for EPS Foam thickness?

You may be under the EIFS minimum requirement for EPS Foam thickness because of an industry shift from 1 1/2″ foam to a 1″ foam standard. With the rising cost of material we have found that many Synthetic Stucco contractors are pushing 1″ foam. In years past the norm was an 1 1/2″ of foam. The problem with using one inch foam is that the minimum requirement for the EPS Foam is 3/4″ which one inch would seem fine then, but after sanding the foam it is getting close to the 3/4″ in troubled areas that need a little extra sanding, but that is not the real problem. The problem is that in many cases the design calls for aesthetic reveals or v-grooves, which are cut into the foam with a hot knife. These aesthetic reveals are anywhere from a 1/2″ to 3/4″ deep when using one inch foam. If you use one inch foam you are limited on your design because you cannot use the aesthetic reveals. The use of aesthetic reveals are great for stopping points when applying the EIFS finish coat so the entire area does not have to be done at once. Also, the aesthetic reveals allow for easy and cheaper repairs if the Synthetic Stucco becomes damaged down the road. Exterior Insulation and Finish System needs to re-finished from coast-to-coast to look brand new, otherwise you will be looking at a patch in the middle of a huge wall. Aesthetic reveals can add to the beautiful design of Synthetic Stucco, help the applicator when applying the finish coat, save costs on repairs. The cost savings of using 1″ foam is not worth the disadvantages and usually these savings are not passed down to the customer. Another disadvantage of using the thinner foam is the r-value you are losing. Your EPS Foam will be a 1/3 thinner so you will be decreasing your r-value of the Exterior Insulation and Finish System by that much. You will still be virtually  eliminating thermal bridging but for my buck I want to keep my r-value as high as possible. The technical term for what I have been calling ‘foam’ or ‘EPS Foam’ is expanded polystyrene (EPS).

There are places where you would use one inch Styrofoam. Window returns come to mind off the top of my head. Typically, the clearance around the window is much lower than the field wall. Door clearances have the same clearance issues. Also, one inch Styrofoam can be used in decorative trim applications

EIFS EPS Foam

EIFS minimum requirement for EPS Foam thickness

Another EIFS Season Starting Soon

Another EIFS Season Starting Soon

Just around the corner is another EIFS  Season.

We are getting prepared for another EIFS season. We are already starting to book up quick which is a really good thing. Make sure you call to schedule your repairs. This season is sure to be busy. Read more Another EIFS Season Starting Soon

EIFS Preparations for Rough Openings Specification

EIFS Preparations for Rough Openings Specification

A complete overview of EIFS Preparations for Rough Openings Specification

 

In this post we are going to take a look at EIFS Preparations for Rough Openings Specification. Rough openings are normally thought of as door and  windows openings, but what also falls into this spec are expansion joints and the top of parapet walls. Dryvit’s Aqua Flash is applied to the jam. Read more EIFS Preparations for Rough Openings Specification

Why most EIFS contractors are doing it wrong

Why are most EIFS contractors are doing it wrong

There is a very simple reason why most EIFS contractors are doing it wrong

The main reason EIFS contractors are not doing EIFS the right way is that it cost a lot more money to do it right. There are a hundred things you could leave off, and not even do on an EIFS job to make your life easier as a contractor. Treating the windows and doors before the foam is stuck is a very time consuming job, not to mention the cost of using all the right material. Read more Why most EIFS contractors are doing it wrong

EIFS Termination at Parapet Specification

EIFS Termination at Parapet Specification

An overview of the EIFS Termination at Parapet Specification

In this post we are going to talk about the EIFS Termination at Parapet Specification. I have been doing EIFS for a long time and when we are out on repairs it seems like this is one of those things that is almost never done correctly. The proper way to terminate a parapet is to apply Dryvit’s Aqua Flash over the entire top of the parapet and down both sides at least 2″. Read more EIFS Termination at Parapet Specification

EIFS Liquid Moisture Barrier

EIFS Liquid  Moisture Barrier

An in depth look at EIFS Liquid Moisture Barrier

Traditionally, the substrate (OSB) was wrapped with a cloth type building wrap, but after some pretty extensive testing done by The Oak Ridge National Laboratory (ORNL) it was proven that a EIFS liquid moisture barrier is much more effective in an EIFS application for moisture drainage. Read more EIFS Liquid Moisture Barrier

EIFS Grade Termination Specification

EIFS Grade Termination Specification

An overview of the EIFS Grade Termination Specification

In this post we will be taking a look at the EIFS Grade Termination Specification. Before we get into the grade termination spec it is understood that the substrate already has be treated with an EIFS approved moisture barrier (see the post . for more details on applying the moisture barrier). Read more EIFS Grade Termination Specification

EIFS – Remove and Replace

EIFS – Remove and Replace

Here will we walk through a complete EIFS – Remove and Replace on a 91 unit commercial project.

A complete EIFS – Remove and Replace can be one the the most demanding tasks of EIFS Repair. The first ting to consider is why the system failed in the first place and figure out a plan to make sure the newly installed system will not have the same issues. In this case the existing Dryvit was over 20 years old, and the Next Generation of EIFS will be a huge part of addresses issues the old Dryvit had. Unfortunately, some of the issues were design issues and the budget does not have enough money to do any structural changes there is just enough money to complete the EIFS remove and replace.

I will be working on this post over the next few weeks … stay tuned for the rest of the story.

Job Site images (more to come)

EIFS – Remove and Replace

EIFS Moisture Testing

EIFS Moisture Testing

EIFS repair and EIFS moisture testing goes hand in hand

I think it is about time we included EIFS moisture testing as a service in our everyday services, as it only makes sense to find out where the moisture is and where it came from before we even start any repairs. Till this point we had been calling in 3rd party inspectors and waiting for the results and then taking over from there and correcting all their findings anyway. The truth of the matter is that you really cannot simply read a book, go out and buy an expensive moisture EIFS Moisture Testingmeter and think you are going to be proficient at finding moisture behind the synthetic stucco. It takes years of particle experience in the field. We have been applying Exterior Insulation and Finish System for over 27 years and have been focused on synthetic stucco repairs full time for over 5 years. There is absolutely no one more qualified to do your Exterior Insulation and Finish System moisture test, bottom line. Knowing where to look for moisture intrusion and what to look for is half the battle, but water is a funny thing. I have seen on numerous occasions water infiltrating the the system from one area and running down a metal stud or I-beam up to 30 or 40 feet away and causing damage. The usual suspects for moisture intrusion are other products not the synthetic stucco itself. The flashing will fail or was not done right in the first place or the caulking will begin to crack and let moisture in around the doors and windows. Whether, the roof copping or the sealant failed it is usually due to one of two things someone didn’t do it right to begin with or someone did not maintain it for years. We have done a ton of repairs over the years and we have seen it all. We know exactly what the problem is as soon as we look at it nine times out of ten. Just knowing there is moisture behind the wall and what the percentage reading from a meter is, is really not good enough to begin the repairs or even estimate how much it is going to cost to fix it. You have to know where the moisture came from and how you are going to prevent it from returning. For this reason we carry a moisture reader with us on all our repair jobs. Moisture testing goes hand in hand with a visual inspection. Having the equipment is a great help in determining the problems but there is nothing that can replace 28 years of hands on experience. A good EIFS inspection utilizes testing equipment and years of experience in the field.  

EIFS (Exterior Insulation and Finish System) is also known as Dryvit™ or Synthetic Stucco.

EIFS / Dryvit Repair
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For more information check out our post on Moisture Drainage Systems

EIFS Moisture Testing

EIFS Sealant

EIFS Sealant

Use an approved EIFS Sealant when caulking Synthetic Stucco

A low modulus approved Sealant is used as a weather sealant in order to seal joints. This sealant is used in order to have the best paint-ability where painting is required. A durable watertight, flexible seal will form and the adhesion to EIFS and other porous surfaces is reflected in an outstanding curb appeal for your building. Dryvit or any premium primer will be acceptable in order to ensure proper adhesion to EIF System and other porous surfaces such as masonry surfaces.  The Spectrem line is recommended for use on new and remedial construction as a weather seal.  Sealant may be used for restoration as well as repairs.  It can be easily painted over with great results using an EIFS manufacturer paint product.  Dryvit offers a sealant that at 50% compression at 70 degrees c (158 degrees f) on limestone, brick, concrete as well as concrete showed no stains after 14 days.  Your Exterior Insulation and Finish System surface must be free of any foreign substances such as water, frost, grease or oil and including old sealant, dirt and efflorescence   A base coat of primer should be used.  EIFS Caulking and SealantsIn order to have a warranty for your Exterior Insulation and Finish System sealant from Dryvit a field adhesion test shall be utilized by the contractor in order to verify the adhesion characteristics as well as the compatibility with the specific materials you are using as an Synthetic Stucco sealant.  You may follow Dryvit’s Field Adhesion Test Procedure with the results being submitted to Dryvit’s Warranty Department.You may apply the  primer full strength with a brush or a roller.  Applying a thin coat that is uniform and no more than 1 mil when wet.  You do not want to over apply the sealant although some very porous surfaces may require a second coat.  The primer must be dry before applying the sealant.  It should take the primer about 15-30 minutes.  You must do the priming and sealing on the same day. If the sealant is not applied on the same day you would have to reprime.  Metal and such non-porous surfaces must be clean and rust free.  You may use a solvent to clean it with which is available at most sealant / building supply houses.

caulking and sealant

EIFS Sealant