A 4x8 sheet of panel siding weighs roughly 38 lb to 77 lb depending on the product. James Hardie publishes HardiePanel 5/16 in. at 2.40 lb per square foot, which is 76.8 lb for a 4x8 sheet. LP publishes SmartSide 38 Series panel at 1.5 PSF, about 48 lb. A 3/8 in. T1-11 plywood panel is listed by retailers around 38 lb. The one common panel nobody agrees on is 19/32 in. T1-11, published anywhere from 47 lb to 70 lb depending on the source, a 49 percent spread. OSHA's materials handling guidance recommends limiting a one-person lift to 50 pounds and using two or more people above that, so several of these are a two-person lift on the published numbers alone.
The published figures
Every number below came from a manufacturer document or a retailer's own spec field. Where a figure is calculated from a published pounds-per-square-foot value, we say so and show the arithmetic. A nominal 4x8 sheet is 32 square feet.
| Panel | Thickness | 4x8 sheet | Where it comes from |
|---|---|---|---|
| T1-11 plywood | 3/8 in. (11/32) | 38.4 lb | Retailer spec field |
| LP SmartSide 38 Series panel | 0.354 in. | 48.0 lb | Calculated from LP's published 1.5 PSF x 32 |
| LP SmartSide 76 Series panel | 0.418 in. | 48.0 lb | Calculated from LP's published 1.5 PSF x 32 |
| LP Smart Panel OSB | 7/16 in. | 48.3 lb | Retailer spec field |
| LP SmartSide 190 Series panel | 0.578 in. | 64.0 lb | Calculated from LP's published 2 PSF x 32 |
| T1-11 plywood | 19/32 in. | 47 to 70 lb | Sources disagree. See below. |
| HardiePanel vertical siding | 5/16 in. | 76.8 lb | James Hardie's published 2.40 lb/sq ft x 32 |
| Hardie Architectural Panel | 5/16 in. | 79.7 lb | James Hardie's published 2.49 lb/sq ft x 32 |
Sources reviewed July 2026: James Hardie HardiePanel submittal sheet (Feb 2024) and Hardie Architectural Panel form (July 2024); LP SmartSide Product Guide and Specifications (Sept 2025); retailer spec fields at Chinook Lumber. Confirm against your supplier's current figure for the product you actually bought.
The one we could not settle
19/32 in. T1-11 is one of the most common panels on a jobsite. It is also the one figure we could not pin down. Across manufacturer, retailer and big-box listings we found it published at 47, 48, 53, 55.6, 62, 64 and 70 pounds. That is a 49 percent spread on one nominal product.
It matters because the low end and the high end land on opposite sides of a 50 pound lifting threshold. If you are deciding how to staff a wall, the published record gives you no useful answer.
Two of the figures in that range are visibly corrupted. One big-box listing publishes a product weight of 3,458 lb for a single sheet, which is a unit load rather than a panel, and the same record lists a coverage area of 47.938 square feet, which is actually the panel width in inches. That corrupted record has been syndicated to at least one other retailer, so the bad number now appears in more than one place.
We are not going to publish a number for this one until we have weighed it ourselves. Putting a fourth guess into circulation would make the problem worse.
Where the published record contradicts itself
- A manufacturer disagreeing with itself on one sheet. James Hardie's HardiePanel submittal states 2.40 lb per square foot and, on the same document, a density of 83 lb per cubic foot. At 5/16 in. thickness that density works out to 2.16 lb per square foot, about 10 percent below the stated figure.
- Two Hardie panels, two densities. HardiePanel is published at 2.40 lb/sq ft and Hardie Architectural Panel at 2.49, both 5/16 in. fiber cement, both on 2024 forms.
- APA disagreeing with APA. The current Panel Design Specification and APA's own performancepanels.com give different panel weights, because the website is still running superseded data.
- A retailer publishing two weights for its own item. One national retailer lists the same LP SmartSide item number at both 40.8 lb and 44 lb on different pages.
- Grooved and ungrooved listed identically. One supplier publishes 64.0 lb for plain, 4 in. on-center and 8 in. on-center 19/32 T1-11. Grooving removes material, so at least two of those three are a catalogue value applied across variants.
Who publishes nothing at all
We checked and could not find a usable weight or density figure published by Allura, Roseburg, Georgia-Pacific, Huber, West Fraser or Weyerhaeuser for the panel products we looked at. James Hardie publishes weight in PDF documents only, never on its product pages. LP publishes it in a catalogue PDF and in page data that does not render as visible text.
Two figures circulating online are worth ignoring. A commonly repeated 125 lb for 5/16 in. HardiePanel contradicts every primary source we read. So does 55 to 60 lb for 7/16 in. OSB. Both trace back to content sites rather than a manufacturer.
Most of the figures above sit at or over the 50 lb line. This is what that weight looks like on a wall.
What this means for lifting a sheet
OSHA's materials handling guidance recommends limiting what one person lifts to no more than 50 pounds, and says that when lifting loads heavier than 50 pounds you should use two or more people. That is guidance in a possible solutions section rather than a numeric standard, and OSHA addresses lifting hazards under the General Duty Clause rather than a published weight limit. The NIOSH lifting equation uses a 51 pound load constant as the maximum recommended weight, and that figure assumes the load is close to the body, at about waist height, with no twisting and a good grip.
A 4x8 sheet held flat against a wall at height meets none of those conditions, so the useful limit in that position is lower than the number on the page. On the published figures alone, HardiePanel and 190 Series panel are over the line before you account for any of that, and 19/32 T1-11 probably is.
This is why our own instructions require a minimum of two people at all times, and why our tool is not a replacement for a second worker. We wrote about that here.
What we are doing about the gaps
Compiling other people's numbers only gets you so far, and this page has three holes in it: 19/32 T1-11, LP's 190 Series per sheet, and any figure at all for several manufacturers. We are going to put these panels on a scale ourselves and publish what they weigh, with the product, the supplier, the date and the scale used. When that is done this page gets a measured column next to the published one, and where the two disagree we will say so.
If you supply or install these panels and want a specific product added, tell us which one.
Questions crews ask
Is a sheet of T1-11 a two-person lift?
At 3/8 in. it is published around 38 lb, which is under the 50 pound figure OSHA's guidance recommends for a one-person lift. At 19/32 in. the published range spans that threshold, so the honest answer is that the published record does not tell you. Our own instructions require two people regardless, because the weight is only part of the problem once the sheet is up against a wall.
Is fiber cement heavier than wood panel siding?
Substantially. HardiePanel 5/16 in. is published at 76.8 lb for a 4x8 sheet against about 48 lb for LP SmartSide 38 Series. That is roughly 60 percent more.
Is OSB T1-11 heavier than plywood T1-11?
At the same nominal thickness, yes. At 3/8 in. one supplier lists plywood T1-11 at 38.4 lb and an OSB panel at 44.0 lb, about 15 percent heavier, which is consistent with APA's structural figures showing OSB running above plywood.
Why do published weights vary so much?
Moisture content, species, grade, grooving, and whether the figure is a product weight or a shipping weight. On top of that, at least one big-box record has a unit load weight sitting in a per sheet field, and that record has been syndicated elsewhere.