ADU Construction in Pacoima, Under a Metal Roof

Pacoima ADU construction under a light standing-seam metal roof that turns back hard sun, moves on clips as it heats, and is checked by LADBS at each stage.

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A standing-seam metal roof in a light color is our pick for a Pacoima ADU, since an inland lot puts a roof through hard sun and dry heat. The pale finish turns back much of the heat right at the roof surface, and the steel panels will not curl, crack or shed granules the way shingles do. With the old house gone after a fire, the unit's roof can be drawn around those panels from the start.

Clips, underlayment and the ridge

Long steel panels grow and shrink as they heat and cool through the day, so they are held down with sliding clips hidden under each seam, which let the metal move without working its fasteners loose. Beneath the panels goes a high-temperature underlayment, since an ordinary felt can soften under a hot metal skin. A vented ridge and soffit intakes let warm air leave the attic. Trim at the eaves, rakes and ridge is folded from the same coated steel, and the panel ends get closures so birds and wind-driven dust stay out.

What LADBS checks on the roof

LADBS reviews the roof on the ADU plans: the panel product and its listing, the fire classification of the assembly, the clip spacing and the attic ventilation. The energy forms can credit a reflective roof, and when they do, the color and its rated reflectance are written into the set and have to match the panels delivered. In the field, an inspector looks at the flashing where the roof meets a wall or a vent pipe, and the final confirms that the attic vents are open and screened.

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