My 5-Step Pre-Shipment Checklist (Built From $3,200 Worth of Mistakes)

I'd like to tell you about the time I ordered $3,200 worth of Uponor PEX-A tubing for a job. Everything looked right on screen. The order was placed. Three weeks later, the roll arrived, and my installer called me with that tone… “Check the coil.” I had ordered PEX-A when the spec called for PEX-B. The whole roll was wrong. Cost me $890 to ship it back and re-order, plus a week of delay. $3,200 in materials, straight to a return label. That was the second time that year.

So I built a pre-shipment checklist. Not for the manufacturer. For myself. It’s saved us an estimated $8,000 in potential rework since. This is that checklist. It’s designed for anyone ordering from suppliers like Uponor, or online print providers (like 48 Hour Print), or anywhere you can’t just “give it back” without a fight. If you're ordering materials for a project, this is for you.

Here are the 5 steps.

Step 1: Verify the Core Spec (Not Just the Product Name)

This is where I made my first mistake. I ordered “Uponor PEX tubing.” That’s like ordering “a car.” The name is just the category.

What you need to do is confirm the exact spec before you add it to the cart. For PEX, that means:

• Material grade: PEX-A, PEX-B, or PEX-C. (Uponor primarily makes PEX-A, but your job might need PEX-B. Check the spec, not the brand.)
• Pressure rating: This is printed on the pipe. For hot water, you’re usually looking at a pressure rating of 100 psi or higher at 180°F.
• Diameter and thickness: 3/4” PEX is not the same as 1/2” PEX. And within 3/4”, there are different wall thicknesses (e.g., 3/8” vs. 1/2”). The spec callout should list this.

The simplest check: Find the actual spec sheet for the product you’re ordering and read the numbers. Do they match the numbers on your drawing? If not, you’re about to make a $3,200 mistake. (I really should have done this. My $890 return fee was the tuition.)

Step 2: Confirm the Temperature and Pressure Limits for Your Specific Application

This is the nuance I ignored. Uponor PEX has plenty of ratings: Uponor PEX temperature rating is typically up to 200°F for standard applications. But what about a radiant floor system with an outdoor boiler? Or a potable water line that sees direct sunlight? Temperature and pressure limits change based on the application.

Here’s the trick: A pipe rated for 200°F for a continuous flow of water might be derated for 180°F if you’re using a glycol mixture (common in radiant heating). The manufacturer's literature (available on their site) will tell you this. Find the specific de-rating chart for your exact fluid type and application.

Action item: Before you pay, ask yourself: “Is this product rated for the temperature, pressure, and fluid I’m using?” If you can’t find the chart, call the supplier. Don’t assume. (I once assumed standard PEX was fine for a high-temp boiler loop. It wasn’t. Cost me a spool of pipe and half a day of labor.)

Step 3: Check the Physical Attributes (The 'Will This Fit?' Check)

This is where online ordering goes wrong. You look at the photo, it looks right, you click buy. But the photo is for a standard product—yours might be custom.

Three things to measure:

• Dimensions: If the pipe is 100 feet on a coil, is that the exact length you need? Or are you buying a 300-foot roll and cutting it yourself? (I’ve ordered 100-foot rolls that were exactly 98 feet—annoying, but manageable. The 300-foot roll that was 310 feet? That was a shipping overage I didn’t budget for.)
• Connections: Does the PEX fitting require a crimp ring, an expansion ring, or a push-fit connector? The physical connection type is not a “nice to have”—it determines the tools and labor you need. Uponor’s ProPEX expansion system is different from a crimp system. Make sure the pipe and fittings are compatible.
• Packaging: Is it a continuous coil? Or individual sticks? A 1000-foot coil won’t fit through a standard door. Plan for that.

My rule: I spend 5 minutes on a tape measure or calliper checking the product dimensions against my job site. Five minutes of verification beats five days of re-run. (Which, honestly, I’ve learned after three similar mistakes.)

Step 4: Verify the Quantity (The 'Do I Have Enough?' Check)

This step feels obvious, but I’ve seen it fail spectacularly. The mistake is ordering based on “feel” instead of a take-off.

The right way: You have a material list. You should know the exact number of linear feet of 3/4-inch PEX you need. Then add 15% waste. Then check your order quantity against that.

The counterintuitive part: Don’t just check the total footage. Check the number of rolls. If you need 700 feet and the product comes in 500-foot rolls, you’re ordering two rolls (1000 feet). That’s “enough” in quantity, but you have 300 feet of excess. That’s fine if you’re storing it, but if you’re on a tight budget, that’s wasted money. Order the closest match: a 500-foot roll and a 200-foot coil (if available). (Note to self: always check the available roll sizes on the supplier’s site before you click “add to cart.”)

For online printers like 48 Hour Print, the same logic applies. If you need 500 business cards and the minimum is 250, you’re ordering two sets of 250. Fine. But are you getting 500 of the same design? Or are you ordering 500 of the same card? Those are different things.

Step 5: Review the Shipping and Lead Time (The 'Will It Arrive on Time?' Check)

This is where my third mistake happened. I had the right product, the right quantity, but I assumed standard shipping. The job had a hard deadline—a grand opening. The shipment arrived three days late.

What to check:

• Lead time: Is it “in stock” and shipping today? Or “made to order” with a 5-7 day lead time? Most online printers have a clear production calendar. Look for it.
• Shipping method: Ground? Expedited? It’s not just the cost—it’s the guarantee. Standard delivery is an estimate. Expedited is a commitment. (Which, honestly, for a hard deadline, I only use the guaranteed options now.)
• Delivery date: Count the calendar days from today to your deadline. Then subtract 1-2 days for “buffer.” That’s your window. If the supplier can’t promise a delivery within that window, you need to either find another supplier or pay for rush shipping. Period. (The $3,200 error? That was just a standard ship. Now I always check the “ship date” vs. “deliver by” date.)

A Few Final Warnings (From Experience)

I’ve been doing this for a while. Here are the most common mistakes I see people (and myself) make:

• Skipping the spec sheet. “It says Uponor, so it must be right.” Nope. Check the part number and the spec. Otherwise, you’re gambling.
• Assuming the photo is accurate. The product image is often a stock photo. Read the description, not the picture.
• Not asking about returns. Before you pay, find the return policy. If it’s “no returns on custom orders,” you’re stuck. Ask first.
• Trusting “estimated” delivery dates. If the supplier says “est. 5-7 business days,” and you need it in 5, you need to upgrade or pivot.

The checklist above takes about 10 minutes to run through. I have it taped to my monitor. Since I put it there, I’ve caught 47 potential errors (some small, some huge). The biggest one was a 3/4” PEX order that was actually 1/2” PEX—wouldn’t have fit the fittings. Saved me a $2,100 reorder. That’s the value of a checklist. Simple.