The Asphalt Shingles Distributor Buying Guide That Doesn't Start With Price

October 14, 2024. About 9:15 in the morning.

I was standing behind a 12-unit apartment building, watching a three-man crew stare at a roof that was two-thirds stripped. It had started raining about twenty minutes earlier. The order called for Owens Corning TruDefinition® Duration® shingles in Weathered Wood. 44 squares. We were six bundles short.

Six bundles.

The supplier we chose for that job had the best quote. They also had the farthest warehouse. The next delivery, if we paid a small-order freight charge, was four to six business days out. In western New York, in late October, that isn't a delivery date. That's a punchline.

The crew tarped what they could and drove an hour back. I spent the rest of the morning explaining to my project manager why the cheapest quote wasn't cheap.

What most shingle buyers compare is wrong

Let's get one thing out of the way. I handle procurement for a 27-person general contracting company that does multifamily renovations and re-roofs. I've been buying Owens Corning shingles and insulation for seven years. We aren't a national builder. Our shingle orders usually run 30 to 50 squares. That means distributors don't chase us. It also means we have to be smart about every purchase order.

For a long time, smart meant getting three quotes and comparing the per-square price. That sounds like procurement. It's actually a good way to lose money.

On that October job, the local distributor quoted $98 per square for the Duration shingles. Delivery included. They had Weathered Wood in stock, and they could tell me the lot number before we ordered.

The online supplier quoted $89. Then freight showed up: $680 to bring it from a regional warehouse. That added about $15 per square. And the full quantity wasn't at one location, so part of the order came from a second warehouse with a different production run.

The question everyone asks a distributor is, what's your best price? The question that matters is, what's the total delivered price, from one lot, and what happens if I need six more bundles in three weeks? Not as catchy. But it pays better.

Same brand, different production run

Owens Corning makes a good shingle. The Duration line is manufactured to meet ASTM D3462, the standard for fiberglass-based asphalt shingles. Weathered Wood is one of the most popular Owens Corning colors, and for good reason. I'm not here to criticize the product. I'm here to tell you that asphalt shingles come from production runs. Color can shift slightly between runs. That's true for every shingle manufacturer, OC included.

Roofers know this. That's why they blend bundles from different stacks, so small color differences spread across the whole roof rather than showing up as a band.

Blending only works when you have all the material. If you run short and the replacement comes from a different production run, you can't blend your way out of it. The line where one lot meets another sits across a slope. In the wrong light, it's a stripe. The homeowner might not say, 'that's a different lot.' They'll say, 'something looks wrong with that roof.'

That's an expensive conversation.

I still kick myself for not asking about lot numbers on that job. We ask about lot numbers for paint. We ask for siding. It never crossed my mind for shingles. Now, if you're ordering Owens Corning Weathered Wood or any other color, the lot number goes on the purchase order and the receiving report.

What acoustic insulation taught me about specifications

Roofing wasn't the only thing we learned that fall. We were also pricing a multifamily rehab where the drawings required insulation in the walls between dwelling units to hit a specific sound rating.

This gets into acoustical engineering territory, which isn't my expertise. I can tell you what I learned from the purchasing side. A sound rating belongs to the whole wall assembly, not to a batt. STC, sound transmission class, is a single-number rating calculated from an ASTM E90 lab test of a complete wall assembly. The insulation in that wall is one component of the tested assembly. Thickness, density, facing, and how the batt fits in the cavity all matter.

So when a supplier says, 'we have R-13 here, it's basically the same thing,' that's a red flag.

Maybe it is the same. Maybe it isn't. If the supplier can't produce a product data sheet that connects their batt to the specified assembly, I'm not the one who gets to decide it's equivalent. The architect is. And the architect will ask for documentation before approving the submittal.

That's what acoustic insulation sourcing really is: documentation. Most acoustic insulation specifications are written around a tested assembly, a product, or both. The purchase order needs to match. The delivery ticket needs to match. If the product number on the truck doesn't match the spec, the material doesn't go in the wall.

I've heard distributors say acoustic insulation is just a label they put on the same batt to charge more. Sometimes that's true. Sometimes it isn't. If the wall assembly was not tested with the cheaper product, then cheap is the most expensive thing you can install.

The real cost of the wrong choice

Let me put real numbers on the shingle mistake.

The six bundles we needed on that October job cost about $200 in material and $140 in freight. The tarp, the water pump, the rescheduled inspection, the crew driving back an hour, and the project manager's afternoon on the phone added up to something closer to $3,400. On a material order that should have run about $6,000, that's not a rounding error.

Insulation mistakes usually show up later. Wrong batts get hidden behind drywall. They announce themselves when a tenant complains about hearing the neighbor's TV, or when the closeout documents don't match the spec. The fix isn't replacing the batt. The fix is opening the wall, removing the wrong material, ordering the right product, and closing the wall again. A $1,800 order can create a $15,000 problem.

I can only speak to our situation. If you're a production contractor buying 300 squares a month, you'll get different treatment and different leverage. The questions below still apply.

The asphalt shingles distributor buying guide, in four questions

Most buying guides want to tell you how to compare warehouses. Here's what I've landed on after paying for the lesson.

1. Can the whole order come from one lot? If not, how many lots? Put the lot numbers on the purchase order and the delivery receipt. Different lots can work if you blend them across the entire roof. They don't work when a second lot shows up after half the roof is installed.
2. What is the total delivered cost? Material, freight, accessories, unloading. And what does a follow-up order cost if you're short? The small-order price is the number that burned us.
3. Are you set up for warranty paperwork? If you're buying Owens Corning because the warranty means something to your customer, the distributor should be able to explain how registration and claims work. If they only move boxes, that's a clue.
4. What is the documentation for anything acoustic? Ask for the product data sheet before you order. Check the product number against the spec. No paperwork, no purchase order.

That last one matters for a small contractor. Some distributors treat a 30-square order, or a half-pallet of acoustic batts, like a favor they're doing you. Good distributors treat a small order as the start of a relationship. The one we use now has taken $2,000 orders from us and never blinked. When we needed extra bundles on a later job, they loaded them the same day from their own stock. That relationship is worth more than any per-square discount.

The more I buy, the less I trust a low price per square. Same color, same brand, same lot, delivered, documented. That's the guide.