Before ordering custom bifold doors, check that the performance evidence supports the system being quoted. Connect the proposed door, its configuration, the relevant rating or test documents, and the final quote revision. Treat an unexplained mismatch as an open purchasing question, not as permission to assume the most favorable number applies.
This guide concerns exterior, glazed folding doors for US projects. It does not cover closet-door hardware. It also does not certify any Senmit product or decide what your local building department will accept. Its purpose is to help you ask a more precise question before approving a custom order: “Which document supports this particular claim for this proposal?”
Start with the claim, not the logo
A brochure may mention insulated glass, a thermal break, a pressure rating, or certification. These are different kinds of information. Collect the actual document behind the claim and write down what it is intended to establish. A collection of impressive logos is difficult to compare; a named product and a traceable document can be reviewed.
Recent public buyer discussions illustrate the problem. A July 2026 discussion about overseas windows and doors raised uncertainty about product quality and supporting documentation. An earlier patio-door discussion asked whether manufacturer-stated energy values were equivalent to NFRC certification. These are customer questions, not evidence that a named supplier passed or failed a requirement.
Before requesting paperwork, ask your designer or other responsible project professional to identify the performance information needed for the opening. The supplier can then answer a defined request. Do not start with an arbitrary internet pressure or energy value and assume it fits every climate, exposure, or building.
Make a document-to-quote crosswalk
Use one row per claim. The following is a buyer's record, not a substitute for an engineer's review or a certification body's determination.
| Item | What to record | Question it answers |
|---|---|---|
| Current proposal | Supplier, named system, drawing reference, date and revision | Which door are we actually considering? |
| Energy evidence | Rating source, product identification, glazing description, values and units | What supports the energy claim in this quote? |
| Air, water and structural evidence | Report or certification reference, scope, product description and applicable conditions | What was evaluated, and how does it relate to this proposal? |
| Supplier's applicability response | Written explanation of matches, differences and limitations | Which unresolved differences need specialist review? |
| Project review | Reviewer's name, required follow-up and the accepted document revision | What remains open before the order proceeds? |
Keep the source files alongside this table. A screenshot can lose a footnote, date, product identifier or limitation. If a sales name differs from the manufacturer or system name on a document, ask the supplier to explain that relationship rather than deciding from appearance alone.
Read energy evidence on its own terms
The NFRC residential certification program provides independent energy-performance verification through a defined process involving simulation, testing and certification. A supplier's spreadsheet of U-factor or solar heat gain coefficient values is not, by itself, the same thing as evidence of participation in that process.
Where NFRC certification is claimed, use the NFRC Certified Products Directory and ask the supplier for the information needed to identify the relevant product. NFRC also offers a label-rating search for checking rating data. Record the result and resolve inconsistent identifiers with the supplier or certification organization.
Ask what the reported number represents: a glass component, a rated product, or a project-specific calculation. Do not silently substitute one for another. Also record the units and calculation or rating basis; identical-looking numbers are not enough to establish a like-for-like comparison.
Custom size deserves a careful question, not an automatic rejection. Rating programs can use standard-size or project-specific methods. Intertek's 2026 explanation of NFRC certification paths distinguishes reusable product certification from project-specific commercial certification and discusses standard-size and project-size calculations. Ask which route and evidence apply to your proposal. A report does not become invalid merely because its reference dimensions differ from your opening, nor does that difference establish that it covers the order.
Do not use an energy rating as weather-performance proof
Keep the energy review separate from the air, water and structural review. A favorable U-factor does not answer a question about wind-driven water, and a large pressure number does not explain heat transfer.
FGIA's performance-class guidance distinguishes design pressure, or DP, from performance grade, or PG. In that framework, PG includes the applicable design pressure and other requirements of the referenced standard. Therefore, ask whether a quoted pressure is a design pressure, a test pressure, or part of a complete performance designation. Preserve the designation and standard reference instead of reducing the document to its largest number.
FGIA's certification and labeling FAQs also discuss product type, performance class, grade and tested size in identifying certified performance. For a custom folding proposal, ask the supplier to identify the relevant evaluated system and explain how the proposed arrangement relates to the evidence. Have the responsible professional review any stated limits or differences. Do not extrapolate a result yourself to a larger opening, another sill, or a different operating arrangement.
If a certification claim cannot be located immediately, request the certification agency and specific listing or authorization. FGIA notes that different agencies can certify products and that a claim of meeting a standard is not necessarily a claim of certification. A failed search is a reason to investigate the claim, not an adequate basis for accusing a supplier of misconduct.
Keep three evidence outcomes separate
- Identified and reviewed. The documents are traceable to the proposal, questions have written answers, and the responsible project reviewer has completed the required review.
- Unresolved. A document is missing, an identifier is unclear, or applicability has not been explained. Record the missing answer and who will provide it.
- Does not support the proposed claim. The responsible reviewer identifies a mismatch or limitation. Ask for a different configuration, appropriate additional evidence, or another proposal.
These are purchasing-workflow outcomes. They are not a homeowner-issued certification or a declaration that the finished opening complies with every requirement. Do not convert “unresolved” into “approved” just to keep a delivery date.
Reopen the review when the custom quote changes
Imagine that the initial proposal includes one glazing package and threshold, but a later revision changes both. The correct next step is to send the revised proposal back for an applicability check. The change may be covered, may need an updated document, or may require a different selection. This hypothetical example does not predict a test result.
Keep a short change log with four entries: what changed, which claim it might affect, who is checking it, and the written resolution. Ask about changes to the system, glazing, operating arrangement, sill, dimensions or other details identified in the evidence. Only the relevant supplier, certifier or project professional can determine the consequences within their scope.
Document review also does not replace installation planning. NFRC's consumer FAQ explains that its performance ratings do not account for installation. After the selected system and evidence are settled, use our exterior bifold-door crew-readiness guide to coordinate the separate site work.
What to send with a Senmit custom bifold inquiry
The Senmit Windows & Doors project page presents a Bi-fold opening style and custom project quoting. Ask which currently offered system can address your brief and which supporting documents are available for that proposal. This article does not establish an NFRC certification, a NAFS designation, a tested rating, or local installation service for a Senmit configuration.
Send your project location, intended exterior use, opening information, preferred operation, and the performance-document requirements identified by your project team. Request a named system and current drawing, the available energy and weather-performance evidence, and a written explanation of any limitations or substitutions.
For the broader opening specification, start with our bifold windows and doors ordering checklist. Then use this document crosswalk to evaluate the supporting evidence. Before approving the custom order, make sure the final quote revision and the reviewed evidence still describe the same proposal.
All images are newly generated planning illustrations, not Senmit product photographs, certification labels, test reports, engineering details or evidence of compliance.
