Contributed by Russell Harrison
In my last blog post we looked at the struggles a product rep has comparing a product that is specified that doesn’t match the drawings. Or, how we compare apples to oranges.
In this post, we’re going to take it one level further and look at one small thing that happens at the subcontractor level during the bid phase. Before I go there, I’m going to sidetrack into the glazing side a bit, but we’ll bring it back around to the metal panel industry we spoke about in blog post #1, I promise!
In a past life, I was a subcontractor in Oregon working in the commercial glazing realm. We would install anything glazing related in commercial buildings or high-end residences. That could be curtainwalls and storefronts, automatic door entrances, or even vinyl windows. The reason I bring this up is because it gave our team exposure to items from Divisions 5 (Metal), 7 (Thermal and Moisture Protection), or 8 (Openings). As our work was based around Division 8, this forced us to sometimes work with quite a few items outside of our realm of expertise and brought up a lot of questions internally. Anytime we had time to reach out to a rep and discuss the things we didn’t understand, we would do so. However, when our bid lead times were short, we’d have to make a lot of guesses.
Guessing isn’t an abnormal occurrence in construction estimating. Unfortunately, it’s quite normal. Controlling the amount of guessing for subcontractors is an area where we can all help.
Subcontractors, like most people involved in the commercial construction industry, have to clearly understand the work to bid a project accurately. As product reps, we try to work side by side with our subs to make sure they have all the information they need by the bid date so they can provide a thorough bid, but sometimes things happen outside of our control. A recent item outside of our control, and a very relevant example, would be our white-hot construction market in a booming economy.
During a construction boom, most estimating teams at the subcontractor level are working 60-70 hours a week in an attempt to keep up with the number of projects that are bidding. This doesn’t leave much, if any, time for other daily tasks. Estimators are typically very selective of what they will consider bidding during these times, will only work with general contractors (GC's) they like, will choose to bid jobs that are completely detailed and well specified, or will chose projects that fit into their available labor calendars.
Contributed by Roy Schauffele
One of my favorite movie lines is “you’re killing me, Smalls”, from the baseball movie, 'The Sandlot'.
Well in today’s world, especially specifications for air barriers, the construction industry is killing me. I have written about this item before on #FixConstruction, but to no avail. One of the technical data points I hear design folks dig their feet in on is the “perm rating”. Permeance is a measurement of water vapor transmission through a material, often based on testing performed in accordance to ASTM E96, either Procedure A (dry cup or desiccant) or Procedure B (the wet cup). Big note here, the IBC (International Building Code) in Chapter 2, only references Procedure A.
For the record, I love good reproducible usable data, but the ASTM E96 method of testing leaves me flat. At this moment, I’m sitting here looking at the same material, tested by two different accredited laboratories and there is a 300% difference between the two labs between both two (2) Procedure A samples and two (2) Procedure B samples. With that type of difference, how can one rely on this type of data?
The ASTM E96 standard itself states, in part, “A permeance value obtained under one set of conditions may not indicate the value in another set of conditions”. Based on a round-robin testing effort, ASTM reports E96 has about 20% lab-to-lab variability. I bet you are going to have to think fairly hard about another part of your project manual where you’d allow a 20% variability in testing data.
Permeance data is not an evaluation criterion for ABAA (Air Barrier Association of America). The data is listed by ABAA because the design community has requested it.
Going back to the code definitions, the language used in the air barrier business is constantly changing as the industry and technology evolve. Nowhere is this more evident than in Building Code language, which now fully defines Vapor Retarders and Vapor Permeable in Chapter 2 of the 2015 & 2018 IBC (International Building Code).
Contributed by Russell Harrison
As product reps, most of us have it pretty easy in our day-to-day lives. Sure, there are long days walking, driving, or even flying from meeting to meeting. And don’t forget the many nights in hotels!!! But overall, our jobs aren’t too difficult.
Well, except for the one thing that we don’t have control over. When the drawings and specifications don’t agree on a project. This is always a difficult spot to be in for a product rep. I won’t even start to cover what happens at the subcontractor level, as that’s a blog post unto itself.
Has anyone ever wondered what happens when a manufacturer’s rep is asked to provide a bid in that instance? Many things happen, and not necessarily all of them are good! To give you a background on what products I cover as a rep, I handle aluminum composite materials (ACM), plate, and honeycomb panels in the Pacific Northwest. Our products are specified on a regular basis. A good number of projects we end up working on are handled via substitution request.
Typically, when a subcontractor gets an invite where one of our products are being used (material, not necessarily manufacturer specified), we’re forwarded some, or all of the information we need to get started on providing a material bid. As reps, we get to go through the details and specs to make sure they work together and there aren’t any issues. In the last month, I’ve had eight or ten projects come across my desk where the specs and details did not agree, even to the point of ACM rainscreen panels being specified, but the drawings calling out honeycomb barrier panels. That, kids, is an apples and oranges conversation and very difficult to negotiate at the architectural level without ruffling feathers!
The first thing that I do when providing a subcontractor request is to annotate the project spec and note where our proposed substitution is an equal or comparable, but I always include notes where there was a “miss” on the part of the architecture team to either make sure the spec was clean or where the details don’t match the specs. Unfortunately, because my notes are on the spec, it always seems that I’m picking on the specifier, but I’m not. Regrettably, it’s a feature of the substitution request process, since they are typically based around the specifications.
Contributed by Liz O'Sullivan
I think there’s a big problem with the way substitutions are often handled, at least here in Colorado.
CSI has some great solutions – for example, 2 different substitution request forms, one for use during bidding, and one for use during construction. MasterSpec has what I consider to be fairly decent language regarding substitutions, in Division 01. But these solutions are often not implemented.
I think that “what we’ve got here is a failure to communicate” on several levels:
As a specifier, I sometimes add some language to the “acceptable products” list in each spec section that refers to the Division 00 section “Procurement Substitution Procedures” and/or Division 01 section “Substitution Procedures,” or if I have a Basis-of-Design product by one manufacturer listed, and a list of comparable manufacturers after that, I sometimes add language in each spec section that indicates that the contractor should “Comply with the requirements of Division 01 Section ‘Product Requirements’ for comparable product requests.”
But as with everything else, the project architect still has to know what’s in the specs (and then enforce the specs), the G.C. still has to comply with the requirements of the construction documents (and make sure his subs do too), and the Owner still has to understand that proposed substitutions have to be very carefully evaluated since everything was designed around the specified product.
I think this is where our work as CSI members lies – we should try to educate the rest of our industry about the roles that all parts of a project team play in this substitution process.
This post originally appeared on Liz O'Sullivan's website as "Substitutions: Often a Quagmire, but CSI Can Help"
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Contributed by Roy Schauffele
Late fall and during all winter, concerns and problems arise with air barrier applications on CMU (Concrete Masonry Unit). I know because I get the phone calls. Generally speaking, the fluid applied water-based vapor permeable air barriers go on OK but take a long time to cure or set.
Additionally, I’ve observed a myriad of job site problems with self-adhered vapor impermeable sheets, flashings and tapes. The vapor impermeable materials were applied properly but exhibited blistering and lack of adhesion within days. When investigated there was always liquid water on the adhered side of these sheets.
Observations of quite a few jobs leads me to state that, in this investigation, the vast majority of “problem” jobs had the following in common:
OK, let’s deal with what will lead to an excellent new construction air barrier installation and long-term performance:
1. If the Architect/Specifier has specified a dry water repellent in the CMU, it is already causing a potential problem with the adhesion of a water-based air barrier or primer. This issue has been written about previously in an article in Coatings Pro Magazine July 2018 “Legacy Specifications, Wall and Air Barrier Performance”. The Air Barrier installer absolutely needs to make the Architect/Specifier aware of this prior to bid.
2. If the project is wide open with doors, bay doors and windows not finished or openings not protected from water entry, then a tremendous amount of water can enter the CMU causing some of the problems referenced above. The top of the walls and window openings should be treated in such a way as to prevent water from running in to these open areas.
One of my friends and great technical writer in Austin, TX, Mr. Dave Watts, RA, has the following statement in his specifications: Section 04 20 00, 3.18 PROTECTION OF FINISHED WORK, 3.18.e “Protect tops of masonry with waterproof coverings secured in place without damaging masonry. Provide coverings where masonry is exposed to weather when work is not in progress.”
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