Foil insulation, also called radiant barrier, works by reflecting infrared heat rather than absorbing it like fiberglass or cellulose. In Holladay's semi-arid climate, where summer temperatures climb quickly near Olympus Hills Park and winters bring heavy snow to roofs in Cottonwood, this material cuts attic heat gain during the day and slows heat loss at night. Proper installation requires maintaining an air space between the foil and the roof deck, which matters most in homes built before 1980 that dominate Mount Olympus and Holladay Village streets.
Edge cases appear often in Salt Lake County attics with cathedral ceilings or limited ridge venting. Foil must be stapled to the underside of rafters without sagging into insulation below, or its reflective performance drops. Older homes near Holladay City Park frequently have knob-and-tube wiring or recessed lights that create clearance requirements installers must respect to avoid code issues during any future inspections. Skipping these details leads to trapped moisture when spring melt hits.
Homeowners in Millcreek and Cottonwood Heights sometimes confuse foil with standard insulation and layer it directly over existing batts. This traps heat against the roof sheathing and accelerates shingle wear during the long summer days typical here. Correct placement is always on the attic side facing the roof, with seams taped and edges sealed at gables and eaves to maintain the radiant barrier effect through the full seasonal cycle.
Technician insight
In Holladay, the thing that catches most people out with foil insulation is the way 1960s homes in Mount Olympus have shallow roof pitches and minimal ridge venting. When heavy winter snow sits on those roofs, any foil installed without a full air gap ends up holding condensation against the sheathing once temperatures swing back up.
Cottonwood Heat Gain
A homeowner in Cottonwood noticed second-floor rooms staying hot long after sunset. We found the attic had open fiberglass over the ceiling joists with no radiant barrier. We installed foil stapled to the rafters maintaining the required air space and sealed all seams. The attic temperature dropped noticeably the following week.
How it works
- 1
Attic Assessment
We inspect rafter spacing, existing insulation, ventilation, and any wiring or lighting in homes across Holladay Village and Mount Olympus to confirm foil is the right fit.
- 2
Surface Preparation
Dust and debris are cleared from rafters so staples hold securely, and any gaps around penetrations are noted for sealing during installation.
- 3
Foil Installation
Reflective foil is stapled to the underside of rafters with a consistent air gap, seams overlapped and taped, and edges finished at the eaves and gables.
- 4
Final Walk-Through
We check staple integrity, ventilation paths, and overall coverage before leaving the attic, then review the results with the homeowner.
Pricing
Cost depends on attic size, access difficulty, and whether existing insulation needs adjustment.