Roof & Wall Systems

Metal Building Insulation

The system most PEBs actually get: blanket insulation over the purlin, white-faced / vinyl-reinforced facing, in 3″, 4″, and 6″.

Most Popular System Higher R-Value Option
3″ · 4″ · 6″
Stock blanket thicknesses
Over the purlin
Roof and walls
White faced
Vinyl-reinforced vapor retarder
Unfaced fill
When you need a serious R jump

Why Insulate a PEB

Comfort, condensation, and code

Steel buildings sweat and they dump heat. Insulation is how you keep the shell quiet, dry, and usable year-round in Middle Tennessee.

Two systems cover almost every shop, barn, and commercial PEB we quote. The first is the one most buildings actually get. The second is how you seriously raise R-value.

  • · Cuts heat gain and heat loss through the shell
  • · Helps control condensation on metal panels
  • · Gives the interior a finished look
  • · Supports energy-code and conditioned-space goals
White-faced vinyl-reinforced fiberglass insulation rolls

Higher R-Value Option

Between the Purlin — Unfaced, Into the Cavity

Still goes over the purlin. Unfaced. Then the purlin / girt cavity is filled so R-value jumps. Same method on the walls.

When you need more R
PBR over Z-purlins with unfaced insulation over the member and filling the cavity

Unfaced over the Z and packed into the bay. White facing / liner is the underside.

Unfaced insulation filling the purlin cavity

Install view: unfaced fill packed in the purlin cavity. A liner / banding can finish the underside.

Finished high-R ceiling — white facing quilted in each bay

The second system also goes over the purlins and girts — but the blanket is unfaced. Instead of one faced layer compressed under the panel, unfaced insulation is placed over the members and into the purlin / girt cavity so that space is filled.

Filling the cavity is how you seriously increase R-value beyond a 3″ / 4″ / 6″ faced blanket. Use it when the building is conditioned, code-driven, or you want the shell to work harder year-round.

Over the member

Unfaced across purlins and girts

Unfaced fiberglass still runs over the structural members so steel flanges are covered — not left as a thermal short.

Into the cavity

Fill between purlins and girts

The same unfaced product drops into the bay between members. That filled depth is the R-value jump.

A separate interior liner or banding can finish the underside when the job needs a clean look. That is a finish option — not the name of the system.

Quick Compare

Which system fits the building?

Most popular — faced blanket Higher R — unfaced cavity fill
Where it goes Over the purlin / girt Over the purlin / girt and into the cavity
Facing White vinyl-reinforced (interior finish + vapor retarder) Unfaced. Liner optional if you want a finished underside.
Stock sizes 3″ · 4″ · 6″ Sized to fill the purlin / girt cavity
What you gain Clean white interior, condensation control, first-cost winner Serious R-value increase for conditioned / code-driven buildings
Best when Shops, barns, storage, light commercial HVAC, energy code, or a shell that has to work harder

Typical nominal values for the faced blanket: 3″ ≈ R-10, 4″ ≈ R-13, 6″ ≈ R-19. Compression at the member reduces installed performance. Final R / U is confirmed on the One World Steel quote and project drawings.

Add insulation to the kit

Tell us roof vs. wall, 3″ / 4″ / 6″ faced blanket, or unfaced cavity fill for higher R.

(615) 629-8217 sales@oneworldsteel.com
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Share thickness or system preference. Home office in Bethpage, TN.