Roof Top Blox – XTB-02 Height Extension Kit, 1.5 Polypropylene

The XTB-02 Roof Top Blox is a polypropylene height extension accessory designed to raise the RTB-01 block by 1.5″, bringing total support height to approximately 6″. It installs flush on top of existing blocks using included screws or elevates using threaded rods, offering flexible installation for varied rooftop piping needs.

Key Features:

• Adds 1.5″ height extension, achieving approx. 6″ total stack height
• Molded saddle-top design mirrors RTB-01 for pipe organization
• Fastens directly atop blox with included #10 screws or can be elevated via threaded rods
• Supports up to 100 lb, whether mounted directly or elevated
• Lightweight polypropylene construction consistent with blox system

• Model: XTB-02

• Type: Polypropylene Height Extension

• Additional Height: 1.5″ (total support stack ~6″)

• Load Capacity: 100 lb (45 kg) when mounted on blox or elevated with rods

• Installation: Mounts directly atop RTB-01 with included #10 screws, or elevated using ½″ threaded rods (inserted 1″–3″ into blox)

• Includes: Two #10 × 2-¼″ sheet metal screws for direct mounting

• Compatibility: Not to be used under ROL-05 or ROL-06 roller applications

• Remove any debris from the top of the RTB-01 block.
• Place the XTB-02 extension flush atop the RTB-01 unit.
• Secure it using the included #10 × 2-¼″ screws.
• If elevation is needed, insert ½″ threaded rods into the blox (1″–3″ insertion) and mount XTB-02 atop.
• Ensure combined height does not exceed 14″ when using blox and extension.
• Confirm load distribution and stability before applying piping.

Q: How much additional height does the XTB-02 provide?
A: It adds 1.5″ to the RTB-01, achieving a total support height of around 6″.

Q: What load can the XTB-02 support?
A: It handles up to 100 lb whether mounted directly or elevated with rods.

Q: Are mounting screws included?
A: Yes—two #10 × 2-¼″ sheet metal screws are included for direct installation.

Q: Can I use XTB-02 with pipe rollers like ROL-05 or ROL-06?
A: No. The XTB-02 should not be installed under any roller applications.

Q: How high can the assembly go before exceeding design limits?
A: The assembly should not exceed a maximum overall height of 14″.