Technical library
RCI Interface “Materials Inspection and Quality Control”
How submittal review, mockups, delivery checks and field verification keep specified materials on the job — an INSPEC article on enclosure quality control.
Article by Don Kilpatrick
Read the full article (PDF)Background on this topic from Inspec
Quality control starts with the material, not the installation
Most enclosure investigations that trace a failure back to workmanship find a second story underneath it: the material in the wall was not the material named in the specification, or it was the right material used outside the conditions its manufacturer intended. A membrane substituted at buyout, a primer omitted because the crew had a different one on the truck, a sealant installed past its shelf life, insulation left uncovered through a week of rain — none of these are installation errors in the usual sense. They are gaps in materials quality control.
This article, prepared by INSPEC for RCI Interface, looks at the checkpoints between a written specification and a finished assembly, and at what an owner's representative can actually verify at each one.
Submittal review: the first checkpoint
Submittal review is the only stage where a proposed material can be compared against the specification before money is spent on it. Useful review goes past the product name. It looks at whether the data sheet actually covers the intended use, whether the accessories — primers, tapes, fasteners, termination bars, sealants — are the ones the manufacturer lists as compatible, and whether the installation instructions contain temperature, moisture or substrate limits that the project schedule cannot honor.
Compatibility between adjacent products deserves particular attention, because the enclosure is assembled from materials bought under separate submittals and sometimes separate contracts. An air barrier, a window perimeter sealant and a below-grade waterproofing membrane may each be acceptable on their own and still be incompatible where they lap.
Mockups as a materials test, not just a workmanship test
A mockup is normally discussed as a way to establish an acceptable standard of workmanship. It is also the first chance to see the approved materials together: whether the primer wets the substrate as claimed, whether the transition membrane bonds to both the sheathing and the frame, whether the sealant adheres to the actual finish rather than to a lab coupon. Adhesion pull tests and simple compatibility checks performed on a mockup produce information that no data sheet can supply, because the substrates are the project's own.
Delivery, receiving and storage
Between approval and installation, materials can quietly stop matching the submittal. Practical receiving checks include reading labels and lot numbers against the approved product, looking for expiration or manufacture dates on chemically cured products, confirming that the quantity and thickness delivered match what was specified, and recording any damaged or wetted units before they are moved into the building.
Storage conditions are part of the material's performance. Rolled membranes stored on end, adhesives left through a freeze cycle, insulation stacked without cover and gypsum sheathing exposed to repeated wetting can all satisfy the submittal on paper and fail in place.
Field verification during installation
Once work begins, materials verification continues alongside the broader observation role: confirming that the container on the scaffold carries the approved label, that primers and adhesives are the specified ones rather than substitutes, that coverage rates and cure times follow the printed instructions, and that concealed conditions are recorded before they are covered. This work sits within, and is documented through, construction observation and administration, and it feeds the verification record used in building envelope commissioning.
Documenting nonconformance so it can be resolved
A materials issue is only useful to an owner if it is written down while a remedy is still practical. Effective documentation identifies the specified product, the product actually found, where and when it was observed, and the specification or manufacturer requirement at issue. That record supports the contractor's correction, the manufacturer's warranty review and, if the assembly is later tested, the interpretation of results from building envelope testing.
Where owners can apply this
Owners who want materials quality control on a project should ask for it in the scope of services, not assume it travels with the design contract. INSPEC works from offices in Chicago, Milwaukee and Minneapolis; other technical articles are collected in our educational resources, and you can contact us to discuss a specific project.