Radiant Barrier Installation

How radiant barriers work and where they help

A radiant barrier is a reflective foil that blocks heat radiating from the underside of the roof. It does not insulate in the usual sense, but it stops radiant heat transfer, which is the main way attics heat the house in summer. It works best in warm, sunny climates and when air ducts run through the attic. Benefits are smaller in cold climates. A pro estimates savings based on your roof, attic and cooling use. Walk the attic with the contractor to point out duct runs and any hot spots, because those are the areas where the foil pays off most.

Installation details that affect results

Foil is usually attached to the underside of the rafters with the shiny side facing an air space. Dust on the surface reduces performance, so lay it down where it will stay clean. Leave gaps for ventilation and avoid covering soffit vents. Do not install foil over wiring or recessed lights in a way that blocks heat dissipation. Seal seams and tuck foil against the framing for a tight fit. Make sure the crew keeps the foil clear of exposed wiring splices and recessed fixtures that need airflow to stay cool.

Combining with insulation and ventilation

Radiant barriers pair well with attic insulation and good ventilation. Insulation reduces conductive heat flow, while the radiant barrier reduces radiant heat and ventilation carries away hot air. An energy audit can show whether to add insulation, seal air leaks or upgrade ducts before or with the barrier. Ask for before and after attic temperature readings if you want to verify the effect. Ask for before and after attic temperature readings on a hot afternoon, so you can see what the barrier actually changed.

Drywall Hang & Finish for New Rooms & Additions

Drywall hanging, taping, mudding and sanding for new rooms, additions and framed-out spaces, rea…

Water-Damaged Drywall Replacement

Removal and replacement of water-damaged drywall after leaks, floods or condensation, with dryin…

Fire-Rated Drywall & Garage Separation

Fire-rated Type X drywall installed on garage walls and ceilings, with taped joints and sealed p…

Garage Wall & Ceiling Finish

Finishing a garage with drywall, paint, texture and trim so walls and ceilings look clean, brigh…

Plaster Repair & Restoration

Repair and restoration of traditional plaster walls and ceilings: cracks, holes, loose keys, dec…

Venetian & Decorative Plaster

Venetian plaster, tadelakt and decorative plaster finishes by licensed plasterers: polished wall…

New Stucco Application

New stucco application on additions, new construction and re-clad homes by a licensed plastering…

Wall Insulation Retrofit

Retrofit insulation for existing walls by a licensed insulation contractor: drill-and-fill, dens…

Spray Foam Insulation

Open-cell and closed-cell spray foam insulation installed by a licensed contractor for attics, w…