CSLB #700519 Class B General Building Class C-39 Roofing Licensed & Bonded Est. 1990 5.0 ★
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A-03.B4 · Metal Roofing

Metal roofs,
built for
heat.

Standing seam · Metal panel

High reflectivity, very long service life, and a genuine reduction in cooling load in a climate that spends weeks above 100°F.

A-03.B4.1

What metal
does well

Metal roofing reflects a large share of incident solar radiation rather than absorbing it, which shows up directly in attic temperature and cooling cost. In the Inland Empire that is the single strongest argument for it.

It is also non-combustible, which matters in wildfire-exposed areas, and it has a service life measured in decades with very little maintenance — no granule loss, no membrane to degrade, no tile to crack.

The considerations are up-front cost, thermal movement, and installation quality. Metal expands and contracts substantially with temperature, so panel attachment and seam detail have to accommodate that movement. Where they do not, fasteners work loose and the roof leaks.

Standing seam metal roof · completed
A-03.B4.2

Systems and
detailing

Two main systems, and the detailing that determines whether either performs.

  1. 01

    Standing seam

    Concealed fastener system with raised, seamed panel joints. No exposed penetrations through the weather surface, which is the primary reason it outperforms exposed-fastener systems over a long service life.

  2. 02

    Exposed fastener panel

    Lower cost, faster install, fasteners visible through the panel face with washers that degrade over time and eventually need attention. Appropriate for some outbuildings and budgets; we will be direct about the trade-off.

  3. 03

    Thermal movement

    Metal moves measurably with temperature swing. Clip and fastening systems have to allow it. Rigid attachment is a common installation error that shows up as loosened fasteners and leaks years later.

  4. 04

    Underlayment

    High-temperature underlayment beneath metal, because the surface gets extremely hot. Standard underlayment under metal in this climate is a specification error.

  5. 05

    Flashing and transitions

    Ridges, hips, valleys, eaves and any penetration. As with every roof type, the terminations are where it leaks.

A-03.B4.3

Common questions

Far less than people expect. Over solid sheathing with underlayment and an insulated attic beneath, the difference from other roof types is minor. The perception comes from bare metal over open framing on barns and sheds.
Reflective metal reduces heat gain into the attic, and in a climate with sustained extreme heat that translates into real cooling savings. The magnitude depends on your insulation, ventilation and how the house is used, so we will not quote you a percentage we cannot substantiate.
Standing seam works across a wide range of pitches including quite low slopes. Very low slopes may still be better served by a membrane system. We assess on site.
Higher up front, yes. Over a long ownership horizon the combination of service life and cooling benefit often closes the gap. Over a short one it usually does not, and we will say so.

A-03.B4.4 · Free, no obligation

Get a real number
in writing

Site visit within 48 hours, itemized estimate after. No deposit, no pressure, and no salesperson — you'll be talking to the people who'll do the work.

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CSLB #700519 · Bonded · Insured
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