Johns Manville Radiant Barrier Installation Nationwide

Johns Manville Radiant Barrier Installation: The Pomona Owner’s Guide

Johns Manville radiant barrier installation in Pomona typically runs $1.80 to $2.40 per square foot installed, with most attic jobs landing between $1,400 and $2,800 depending on roof pitch and accessibility. We stock JM AP Foil-Faced and ComfortTherm radiant barrier rolls on our trucks, and we can usually inspect and quote same-day. Most Pomona homeowners discover their radiant barrier is compromised when upstairs rooms won’t cool below 78°F even after the AC runs continuously, or when they spot dust-coated, torn, or sagging foil sections during a routine attic check.

Call (562) 242-7569

Which Johns Manville Models This Applies To

We install and replace Johns Manville radiant barrier systems across three product lines: the AP Foil-Faced series (R-8 to R-21 batts with factory-attached radiant barrier), ComfortTherm batts with kraft or foil facing, and the standalone Reflective Systems rolls (typically 500 sq. ft. rolls, 48-inch width). The critical compatibility gotcha in Pomona’s 91766, 91767, and 91768 ZIP codes is matching the existing facing type - kraft-faced batts installed in 2015-2019 construction often delaminate in our inland heat, and swapping to foil-faced without verifying attic ventilation rates can trap moisture against roof decking.

Identification is straightforward: check the printed tape strip on any exposed batt edge for the Johns Manville logo and R-value, or measure roll width and note whether the facing is perforated (breathable) or solid vapor barrier. For OEM-versus-aftermarket, we source JM direct for batt replacements to maintain original fire ratings and warranty chain, but for standalone radiant barrier rolls we also stock Reflectix as a quality equivalent when the application is non-conditioned attic space only. We never mix facing types within the same roof plane - that’s a code violation that will fail Title 24 compliance on any permitted work in Los Angeles County.

Signs Your Johns Manville Radiant Barrier Installation Is Failing

• Upstairs rooms stay hot past 9 PM. The radiant barrier’s emissivity has degraded - the foil surface oxidized or collected dust - so it’s no longer reflecting 95% of radiant heat back toward the roof deck. In Pomona’s climate, this shows up first in south-facing bedrooms.
• Visible tears, sagging, or batts pulled from top plates. Attic heat cycling and rodent activity stress the facing adhesive. We see this most in pre-1980s homes near Ganesha Park where original kraft facing has become brittle.
• Water stains on ceiling drywall below the attic. A perforated radiant barrier installed where a solid vapor barrier was required allows winter moisture migration. The facing type must match the assembly’s drying direction.
• AC runs 20+ minutes longer than neighbors’ homes of similar age. Your cooling load calculation assumed a functioning radiant barrier. When it fails, the roof deck radiates heat into conditioned space all afternoon.
• Blower-door test shows high attic bypass leakage. Radiant barrier alone doesn’t stop air leaks - and in many Pomona ranches, we find the barrier was installed over unsealed top plates, so conditioned air escapes around the material entirely.

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After

Replacement Cost & What’s Included

What drives the range: roof pitch above 6/12 adds labor time, limited attic access (hatch under 22 inches square), and whether we find existing insulation that must be removed first. Every job gets a Written Price Before Any Work Starts under Haven Standard Clause 1 - flat price, written scope, written warranty before anyone lifts a tool. The 365-Day Done Right Promise covers installation workmanship; materials carry manufacturer’s warranty direct.

DIY or Call Us?

What you can safely check: confirm your attic hatch is sealed, look for obvious tears or sagging from the hatch opening with a flashlight, and photograph any product labels you can reach. Do not walk the attic - many Pomona homes built 1945-1975 have 2×4 ceiling joists spaced 24 inches on center with no decking, and a misstep puts you through the drywall.

Where DIY goes wrong: radiant barrier facing type must match the assembly’s vapor profile, and installing the wrong one traps moisture. More critically, working in an unventilated attic during Pomona’s summer months creates heat-stress conditions that send homeowners to the ER annually. We carry respirators, hydration protocols, and thermal monitors for a reason. Seal the leaks first. The insulation is just the last layer of the answer. Call (562) 242-7569 and we’ll run a blower-door test to show you where the air is actually escaping before we quote any material.

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