LaHouse - Roof

Sandra Scallan, Skinner, Patricia  |  8/6/2007 6:25:03 AM

Wind 

Keeping the roof on is a prime objective of the new building codes. A hip roof, used for most of LaHouse, is more aerodynamically resistant to high winds than a gable roof. The roof pitch, 6:12, is strategically designed to minimize leaks and wind loads yet ensure that water sheds away from the foundation. 

Framing
Hurricane straps and clips connect rafters; straps wrap rafters, securing them to the walls. In the teaching center, hurricane hardware connects the rim band to the top plate, which has anchors in the concrete walls. Framing lumber is secured to the rim band with hurricane straps. Soffits and soffit vents made of perforated fiber cement will be attached securely to framing members.

Decking  
Except in the SIPS section, roof decking is 19/32-in. OSB (two-story section) or plywood (elsewhere). Sheets are attached with ring shank nails (not staples) in a nailing pattern that is closer than customary. SIPS roof-panel seams are reinforced with embedded 2x8 planking.

Metal Roof  
Metal roofing is impact-resistant, wind-resistant and recyclable. Hidden fasteners reduce leaks. Extra screws and edge details create 130-mph wind resistance. Panels are fabricated on site and “snap-locked” into place. High tech “cool color” coating reflects heat like a light color, saving energy and extending the life of the roof.

Tile roof 
Concrete tile looks like clay but is more impact-resistant. Two wind-resistant installation methods are used:

  • Mechanical fastening with screws and hurricane clips on the first course
  • Large-patty foam adhesive using hip ridge boards but no battens

Water

  • Peel-and-stick membrane roof underlayments provide fully adhered secondary moisture barrier under tile, extending roof life.
  • Synthetic roofing "felt" is extremely tear resistant
  • Deck seams under metal roof are sealed with bitumen tape to prevent water intrusion.
  • Valleys, penetrations and seams at roof/wall intersections are flashed
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