MIRO 3-R-4 Roller Pipe Support - Supports Pipes up to 3" Inside Diameter & 3" to 3.75" Outside Diameter, 4" Clearance

The MIRO 3-R-4 is a rooftop roller pipe support engineered to carry 3 in. nominal piping while allowing for axial thermal expansion. Its durable polycarbonate base with a low-friction roller distributes loads evenly and eliminates roof penetrations. With a 4 in. pipe clearance, it is an ideal choice for gas, conduit, or mechanical piping across flat and low-slope roof systems.

Key Features:

• Accommodates up to 3 in. nominal pipe; supports 3.0–3.75 in. outside diameter
• 4 in. fixed clearance with low-friction roller for smooth thermal expansion
• Non-penetrating polycarbonate base protects roof membranes
• Compact footprint for flexible placement and spacing
• Backed by a 20-year limited warranty

• Model / SKU: 3-R-4
• Pipe capacity: up to 3 in. nominal; maximum outside diameter 3.75 in.
• Pipe clearance: 4 in. fixed
• Base dimensions: 7.75 in. × 7.75 in.
• Footprint area: approx. 60 sq. in.
• Materials: polycarbonate base, polycarbonate roller and axle
• Load rating: up to 79 lb per support (based on evenly distributed static load)
• Recommended spacing: up to 7 ft on center depending on load and application
• Design: non-penetrating, permits axial pipe movement with minimal resistance
• Accessories (optional): 3-R Spacer (+2 in. height per spacer), 3-R-4 Pipe Guide Strap

• Plan pipe route and confirm required clearance height.
• Clean roof surface; ensure support areas are flat and debris-free.
• Place the 3-R-4 base directly on the membrane, orienting the roller with pipe direction.
• Set the pipe onto the roller cradle; check that 4 in. clearance is maintained.
• Add pipe guide straps or spacers only if required, ensuring thermal expansion remains unobstructed.
• Align and level multiple supports so the pipe load is shared evenly.
• Verify stability and clearance, then finalize the installation.

Q: what pipe sizes does the 3-R-4 support?
A: it supports up to 3 in. nominal pipe, with a maximum outside diameter of 3.75 in.

Q: what is the clearance height?
A: the 3-R-4 provides approximately 4 in. of pipe clearance.

Q: does it require roof penetrations?
A: no. the polycarbonate base is non-penetrating and rests directly on the roof membrane.

Q: how much load can one support carry?
A: each 3-R-4 can handle up to 79 lb of evenly distributed static load.

Q: can height be increased?
A: yes. optional 3-R spacers can be used to raise the support in 2 in. increments.