Mr-Glass Home Additions & ADU Nationwide

Mr-Glass Home Additions & ADU: The Miami Owner’s Guide

We stock and install Mr-Glass-compatible components for home additions and ADU projects in Miami, with installed pricing for ADU construction running $106,200-$259,600 and standard home additions at $53,100-$153,400 depending on foundation type and tie-in complexity. Most Miami homeowners discover an issue when the glass envelope of their Mr-Glass addition shows seal failure after a tropical weather event, or when thermal expansion gaps that were correct at installation have compressed after years of 90-degree heat cycles. We carry the glazing gaskets, aluminum extrusion splices, and weep screed assemblies specific to Mr-Glass’s frame system on our trucks, and we can typically inspect and quote within 48 hours.

Call (786) 321-4970

Which Mr-Glass Models This Applies To

Mr-Glass has produced three distinct framing systems for residential additions since the mid-2000s: the 400 Series thermal-break aluminum, the 500 Series structural silicone-glazed curtain wall, and the newer 600 Series hybrid that incorporates composite thermal breaks. The 400 Series uses a 2.5-inch nominal frame depth with a single-stage weep; the 500 Series jumps to 4.5 inches and requires a two-part silicone backup seal. The 600 Series accepts either.

To identify your system, check the etched mark on the interior face of the vertical mullion - it reads “MG-4XX,” “MG-5XX,” or “MG-6XX” followed by the date code. The gaskets are not cross-compatible: the 400 Series uses a simple push-in wedge gasket in EPDM, while the 500 and 600 Series use a co-extruded dual-durometer bulb-and-wedge that must be ordered by the linear foot with corner molds factory-welded. We stock both OEM Mr-Glass gaskets and a quality aftermarket equivalent from Tremco that matches the Shore A hardness and UV stabilizer package; for Miami’s UV index, we generally recommend the Tremco equivalent for any repair expected to last beyond seven years, as the OEM formulation can stiffen prematurely in South Florida exposure.

Rowan Construction Group Miami is an independent service provider - not affiliated with Mr-Glass - and we source parts through three verified distributors to avoid the OEM markup when an equivalent meets the spec.

Signs Your Mr-Glass Home Additions & ADU Is Failing

• Condensation between glass lites that does not clear by midday. This indicates seal failure in the insulated glass unit, or IGU - the hermetic edge seal has breached and moist Miami air has entered the cavity. Once the desiccant saturates, the view stays fogged permanently and the thermal performance drops to that of single-pane glass.
• Water staining at the interior sill or baseboard after moderate rain. The weep screed - the slotted drainage channel at the frame base - may be clogged with organic debris, or the sill pan flashing was omitted or reversed during original installation. In Miami, we see this most often on additions where the original contractor set the frame directly on the slab without a raised sill pan.
• Difficulty operating windows or doors that once moved freely. Thermal expansion of the aluminum frame against a fixed substrate can compress the operating clearance; in Mr-Glass systems, the nylon roller trucks in the 400 Series are particularly prone to flat-spotting under sustained load in heat.
• Visible gasket extrusion or “pinched” rubber at frame corners. The EPDM has exceeded its compression set limit, usually after 8-12 years in Miami’s climate. Once the gasket no longer rebounds, wind-driven rain bypasses the seal and the frame corner becomes the leak path of least resistance.
• Exterior silicone beads that have chalked, cracked, or separated from the substrate. UV degradation of the structural silicone in 500 Series installations is accelerated within three miles of the coast; salt aerosol catalyzes the breakdown. The silicone does not “heal” - it must be removed to sound substrate and re-applied with proper primer.

Before

After

Replacement Cost & What’s Included

The range reflects three variables: whether the substrate is wood frame or concrete block, whether the original installation included proper sill pan and head flashing, and whether the IGU size requires custom fabrication or matches a stock lite. Every quote we write itemizes parts, labor, and permit fees separately - no lump-sum mystery. Under Clause 1 of The Haven Standard, that written price is fixed; if we encounter concealed rot or termite damage, we stop work, photograph the condition, and write a signed change order before proceeding. Since 2007, this discipline has kept our projects within a few percent of the original agreed number across 4,000-plus jobs. The 365-Day Done Right Promise covers all Mr-Glass repair and replacement work.

DIY or Call Us?

An owner can safely inspect for the symptoms above: run a hose at the frame perimeter for ten minutes and check the interior sill, or hold a lit incense stick near the closed sash on a breezy day to trace air infiltration. What you find is useful information to relay when you call.

What we do not recommend: removing an IGU without proper suction cups and frame spreaders, cutting old structural silicone with a razor alone, or attempting to reset a frame that ties into the primary structure. The 500 Series curtain wall is designed to accommodate live-load deflection; if you disturb the anchor bolts without shoring the header, the frame can rack and the glass can stress-fracture. We have replaced three homeowner-attempted repairs in Miami where the IGU was dropped, the frame was scratched, or the waterproofing membrane was punctured - each cost roughly double what the original professional repair would have run.

We carry Mr-Glass-compatible gaskets, IGU setting blocks, and silicone cartridges on our trucks. Call (786) 321-4970 to schedule your free estimate; we will inspect, photograph the condition, and deliver a written price before any work starts.

FAQs