Fiberglass insulation and a layer of radiant foil insulation cover the roof. Grand Design goes further by extending both insulation layers the full length of the roof and around to the bottom of the front cap.
Sidewalls, ramp door, slideroom endwalls, and slideroom roof are all welded aluminum framed and laminated with rigid foam insulation. Many others use wood framing and soft fiberglass insulation in the sliderooms that can settle over time and leave uninsulated air gaps.
The underbelly is lined with a radiant foil insulation barrier (Layer 1) and is then covered with fiberglass insulation that wraps all the way up the sides of the frame rails (Layer 2). The main floor enhances the R-Value with yet another layer of fiberglass insulation (Layer 3).
While many toy hauler garage floors are NOT insulated, our exclusive garage floor design provides 3 layers of insulation. A base layer of radiant foil insulation (Layer 1) is topped with fiberglass insulation (Layer 2), and finishes with a second layer of radiant foil insulation on the underside of the garage floor (Layer 3).
Rigid Foam insulation lines the inside of our heavy duty baggage doors.
To maximize the effectiveness of the roof insulation, a vented attic allows condensation to escape the roof structure.
Radiant foil insulation under the gooseneck is a place often forgotten by others.
A high performance furnace and fireplace combine to deliver the heat.†
To force heat into these compartments, dedicated heat ducts run to both the underbelly and storage bay. The enclosed utility center with low point drains provides functional water systems even in extreme cold.
Vertically mounted heat vents integrated into the cabinet bases, push hot air from front to back (rather than straight up). This also means that there are no heat vents in the middle of the floor to collect dirt and debris and that can be broken easily.
Momentum's design has been put to the test in extreme temperatures ranging from ZERO to 100+ degrees. Third party testing showed that the Momentum remained fully functional and retained comfortable temperatures.
Every Grand Design RV is backed with a class leading 3-year limited structural warranty. By selecting suppliers with similar philosophies, many components used on our coaches also carry an extended warranty through the component manufacturer.
101" Wide Body Chassis - Maximum garage space, deeper sliderooms, more livable floor space and space saving pocket doors into the bathrooms
Wide Rail Design - By locating the heavy duty 12” I-beam main rails further outward, more of the floor assembly/unit structure sits on the heart of the chassis instead of the outriggers. Wider rails also create a more stable jack stance, and allows for the slideroom gear mechanisms to be enclosed inside the frame rails (rather than outside). This solid design means that the garage area of every Momentum is rated for full GVWR capacity.
Our Stealth A/C System provides dual 15,000 BTU units and an optional 13,500 BTU 3rd AC.
Cool air is strategically guided through the ducts and forced out of the vents for maximum cooling efficiency.
True Racetrack Ducting extends past each A/C unit to allow for uninterrupted airflow from the front to the back of the coach. Regardless of which A/C is running, cool air is being circulated throughout the coach.
Typical Ducting provides partial airflow with very low cooling efficiency.