Quick Answer: Peterbilt sleeper berths fit 42 x 80 inch or 35 x 79 inch mattresses depending on the model and cab configuration. The Canadian Centre for Occupational Health and Safety identifies inadequate rest as a primary contributor to commercial driver fatigue, making mattress quality a safety consideration.
Table of Contents
- Peterbilt Sleeper Berth Sizes by Model
- The Problem with Factory Peterbilt Mattresses
- What Makes a Good Peterbilt Replacement Mattress
- Our Peterbilt Mattress Builds
- Understanding Foam Density for Truck Mattresses
- Get a Custom Peterbilt Mattress Quote
- Frequently Asked Questions
Peterbilt Sleeper Berth Sizes by Model
Peterbilt is one of the most iconic truck brands on Canadian highways. Whether you are running loads through the Rockies, hauling heavy equipment in northern Alberta, or doing long-haul runs across the Trans-Canada, there is a good chance a Peterbilt is doing the work. Western Canada in particular runs a lot of Petes for heavy-haul and long-distance freight.
If you are looking for a replacement sleeper mattress, the first thing you need to know is what size fits your truck. Here is a breakdown of the most common Peterbilt models and their sleeper berth dimensions.
Peterbilt 579 Sleeper Mattress Size
The 579 is Peterbilt's flagship highway tractor and one of the most common long-haul trucks in Canada.
- 72-inch UltraLoft Sleeper: 42 x 80 inches
- 58-inch Mid-Roof Sleeper: 36 x 80 inches
The UltraLoft is the most popular configuration for over-the-road drivers who spend extended time in the cab. The larger berth gives you room for a proper full-thickness mattress.
Peterbilt 389 Sleeper Mattress Size
The 389 is the classic long-nose Pete. It is a favourite among owner-operators across Canada, especially in the western provinces where it is a common sight pulling heavy loads.
- 70-inch UltraCab Sleeper: 42 x 80 inches
- 63-inch Sleeper: 35 x 79 inches
The 63-inch sleeper is a slightly narrower berth, so double-check your measurements before ordering. A mattress that is even an inch too wide will not sit flat in the berth.
Peterbilt 567 Sleeper Mattress Size
The 567 is built for vocational and heavy-haul work but is also available with a full sleeper option for drivers who need overnight capability.
- 72-inch UltraLoft Sleeper: 42 x 80 inches
- 58-inch Sleeper: 36 x 80 inches
Important: Always Measure Your Berth
These are the standard dimensions, but Peterbilt sleeper sizes can vary based on the model year, factory options, and any aftermarket modifications. Before ordering a replacement mattress, measure the inside of your sleeper berth at the widest and longest points. Year-to-year changes in cab design, storage compartments, and HVAC routing can all affect the available mattress space by an inch or more.
In our experience, about one in five Pete owners who contact us discover their berth dimensions differ slightly from the published specs. A quick measurement saves you time and ensures a proper fit.
The Problem with Factory Peterbilt Mattresses
Peterbilt builds excellent trucks. The factory mattress, however, is not where they put their engineering effort. This is true across the trucking industry, and Peterbilt is no exception.
Factory Peterbilt sleeper mattresses are typically 4 to 5 inches thick and made with low-density polyurethane foam. The foam density in most factory truck mattresses falls between 1.2 and 1.5 lb per cubic foot. That is the same density you would find in inexpensive residential mattresses that are designed for guest rooms or temporary use.
The problem is straightforward. Low-density foam breaks down quickly under regular use. According to the Sleep Foundation, low-density foam loses up to five times more height after repeated compression compared to higher-density alternatives. For a commercial driver sleeping in their truck several nights a week, that means the factory mattress can develop permanent body impressions within months.
We hear this from Pete owners constantly. The factory mattress is the first thing they want to replace. A driver who just spent over $200,000 on a new 579 or 389 should not be sleeping on a mattress that was chosen to keep the sticker price competitive rather than to provide proper rest.
The Transport Canada fatigue management guidelines emphasize that sleep quality directly affects driver alertness and safety. A mattress that has lost its support is not just uncomfortable. It is a fatigue risk. Research published in the Journal of Clinical Sleep Medicine has consistently linked poor sleep surfaces to reduced sleep quality and increased daytime sleepiness.
What Makes a Good Peterbilt Replacement Mattress
Not all replacement truck mattresses are created equal. Here is what to look for when shopping for a Peterbilt sleeper mattress.
Foam Density: 1.7 lb Minimum
This is the single most important specification. Foam density determines how long the mattress will hold its shape and provide proper support. For commercial driver use, 1.7 lb per cubic foot is the minimum you should consider. For drivers who are in the truck full-time, 1.9 lb density is the better choice. We will explain the density scale in more detail below.
Flippable Design for Double the Lifespan
A flippable mattress with comfort layers on both sides gives you twice the usable life. When one side starts showing wear, flip it over and you have a fresh sleep surface. This is especially valuable for truck mattresses where replacement means downtime and logistics. Pete owners tell us the flippable design is one of the features they appreciate most.
Reinforced Edge Support
Truck sleeper berths are not like regular beds. You are climbing in and out of the berth, often sitting on the edge while getting dressed or putting on boots. A mattress without edge support will compress and break down at the entry point within weeks. Reinforced edges maintain their shape and give you a stable surface for sitting.
Right Thickness for the Berth
More is not always better in a sleeper cab. You need enough mattress to provide proper support (7 inches minimum for most drivers), but you also need to fit under any overhead storage, TV mounts, or climate control units. For most Peterbilt sleepers, 7 to 9 inches is the ideal range. The UltraLoft and UltraCab sleepers generally have enough headroom for a 9-inch mattress, but measure your clearance to be sure.
Our Peterbilt Mattress Builds
We build custom mattresses specifically for Peterbilt sleeper berths. Every mattress is made in Canada and built to the exact dimensions of your berth.
Custom Build
Our custom build is designed for drivers who want a significant upgrade over factory without going to the top of the range.
- 1.7 lb per cubic foot foam core
- Approximately 7 inches total height
- Flippable design with quilted comfort layers on both sides
- Reinforced edge support
- Available in all standard Peterbilt sleeper sizes
Full Build
The full build is for drivers and owner-operators who want the best sleep surface we can put in a truck.
- 1.9 lb per cubic foot foam core
- 9 inches total height
- Flippable design with dual comfort layers
- Reinforced edge support
- Available in all standard Peterbilt sleeper sizes
Custom Sizing
If your Peterbilt has a non-standard berth size due to model year, trim level, or aftermarket modifications, we build to your exact measurements. Just send us your dimensions and we will build a mattress that fits perfectly.
Fleet Pricing
Running a fleet of Petes? We offer fleet pricing for companies ordering multiple mattresses. Whether you have five trucks or fifty, consistent sizing across your fleet means we can build efficiently and pass the savings along. Contact us for a custom quote.
Understanding Foam Density for Truck Mattresses
Foam density is measured in pounds per cubic foot (lb/ft3). It tells you how much raw material is in the foam, which directly determines durability and support. Here is how the scale works for truck mattresses.
The Foam Density Scale
- 1.2 to 1.5 lb/ft3 (Low Density): This is what you find in factory truck mattresses and budget replacements. It is cheap to produce but breaks down quickly under regular use. Expect noticeable body impressions within 6 to 12 months for a full-time driver.
- 1.7 lb/ft3 (Commercial Grade): The minimum recommended density for commercial driver use. Provides significantly better durability than low-density foam and maintains its shape for 2 to 3 years with regular use.
- 1.9 lb/ft3 (High Density): Our recommended density for full-time over-the-road drivers. Excellent durability and support. A properly built 1.9 lb mattress with a flippable design can last 3 to 5 years.
- 2.0+ lb/ft3 (Premium): The highest density available. Maximum durability and support, but also the heaviest and most expensive option. Typically chosen by owner-operators who want the absolute best.
The density difference matters more than most people realize. A 1.9 lb foam core contains roughly 50% more raw material than a 1.2 lb core of the same size. That extra material translates directly into longer life and better support.
For a deeper look at how foam density affects fleet mattress decisions, read our Fleet Truck Mattress Foam Density Guide.
Get a Custom Peterbilt Mattress Quote
Ready to upgrade your Peterbilt sleeper mattress? We build every mattress to order, so getting a quote is the first step.
Tell us:
- Your Peterbilt model and year
- Your sleeper berth dimensions (or we can help you figure them out)
- Whether you want the custom build or full build
- How many mattresses you need (fleet orders welcome)
Shop: Shop Our Mattress Collection
Shop This Topic at Mattress Miracle
Popular picks at Mattress Miracle:
- Restonic ComfortCare Dalton & Albany mattress
- Whitney double-sided bamboo mattress
- Somnia 3.0 neck support pillow
Or shop our mattress collection in our Brantford showroom.
Contact us:
- Email: info@mattressmiracle.ca
- Phone: Call 519-770-0001
Medical Disclaimer: The information in this article is for educational purposes only and does not constitute medical advice. If you are experiencing chronic pain, sleep disorders, or fatigue-related concerns, please consult a qualified healthcare professional.
Frequently Asked Questions
What size mattress fits a Peterbilt 579 sleeper?
The Peterbilt 579 with a 72-inch UltraLoft sleeper fits a 42 x 80 inch mattress. The 58-inch mid-roof sleeper fits a 36 x 80 inch mattress. Always measure your specific berth before ordering, as year and factory options can affect dimensions.
What foam density should a Peterbilt replacement mattress have?
A minimum of 1.7 lb per cubic foot density is recommended for commercial driver use. For full-time over-the-road drivers, 1.9 lb density provides longer lifespan and better support. Factory Peterbilt mattresses typically use 1.2 to 1.5 lb density foam, which breaks down significantly faster.
Can I order a custom-size mattress for my Peterbilt?
Yes. Mattress Miracle builds custom mattresses for all Peterbilt sleeper configurations. If your berth has a non-standard size due to year, trim level, or aftermarket modifications, we can build to your exact measurements.
Do you ship Peterbilt mattresses across Canada?
Yes. We ship custom truck mattresses to all Canadian provinces and territories. Mattresses are compressed and roll-packed for easier handling at the truck or terminal. Contact us for shipping timelines to your location.
How often should I replace my Peterbilt sleeper mattress?
Factory mattresses with low-density foam often need replacement within 12 to 18 months of regular use. A quality replacement mattress with 1.7 lb or higher density foam can last 3 to 5 years with proper care. Flippable designs extend lifespan further by distributing wear across both sides.
Do you offer fleet pricing for Peterbilt mattresses?
Yes. We offer fleet pricing for companies running multiple Peterbilt trucks. Volume orders for consistent sizes are eligible for fleet rates. Contact us at info@mattressmiracle.ca or call 519-770-0001 for a fleet quote.
This article is for informational purposes only and does not constitute medical advice. Consult a healthcare professional for guidance on sleep-related health concerns. Mattress specifications and dimensions are based on standard configurations and may vary. Always measure your specific sleeper berth before ordering.