FEMA P55 Coastal Construction Manual, Fourth Edition - Mad Cad

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11 Designing the builDing envelope Volume II Figure 11-46. Blow-off of hip tiles that were nailed to a ridge board and set in mortar. Hurricane Ivan (Florida, 2004) Figure 11-47. Damage to feld tiles caused by tiles from another area of the roof, including a hip tile (circle). Estimated wind speed: 140 to 160 mph. Hurricane Charley (Florida, 2004) Te house in Figure 11-48 had a lightning protection system (LPS), and the LPS conductors were placed under the ridge tile. Conductors are not susceptible to wind damage if they are placed under the tile and the air terminals (lightning rods) are extended through the ridge. 11-42 COASTAL CONSTRUCTION MANUAL
Volume II Designing the builDing envelope 11 COASTAL CONSTRUCTION MANUAL Figure 11-48. The fastener heads on this mechanically attached tile roof had corroded; air terminals (lightning rods) in a lightning protection system (circle). Hurricane Ivan (Alabama, 2004) To avoid the type of problems shown in Figures 11-39 through 11-48, see the guidance and recommendations regarding attachment and quality control in Fact Sheet 7.4, Tile Roofng for High-Wind Areas, in FEMA P-499. Fact Sheet 7.4 references the Tird Edition of the Concrete and Clay Roof Tile Installation Manual (FRSA/ TRI 2001) but, as of press time, the Fourth Edition is current and therefore recommended (FRSA/TRI 2005). Te Manual includes underlayment recommendations. 11.5.4.2 Seismic Tiles are relatively heavy, and unless they are adequately attached, they can be dislodged during strong seismic events and fall away from the roof. Manufacturers have conducted laboratory research on seismic resistance of tiles, but design guidance for these products in areas prone to large ground-motion accelerations has not been developed. As shown in Figures 11-49, 11-50, and 11-51, tiles can be dislodged if they are not adequately secured. In seismic areas where short period acceleration, Ss, exceeds 0.5g, the following are recommended: If tiles are laid on battens, supplemental mechanical attachment is recommended. When tiles are only loose laid on battens, they can be shaken of, as shown in Figure 11-49 where most of the tiles on the roof were nailed to batten strips. However, in one area, several tiles were not nailed. Because of the lack of nails, the tiles were shaken of the battens. Tiles nailed only at the head may or may not perform well. If they are attached with a smooth-shank nail into a thin plywood or OSB sheathing, pullout can occur. Figure 11-50 shows tiles that were nailed to thin wood sheathing. During the earthquake, the nose of the tiles bounced and pulled out the nails. Specifying ring-shank or screw-shank nails or screws is recommended, but even with these types of fasteners, the nose of the tile can bounce, causing enlargement of the nail hole by repeated pounding. To overcome this problem, wind clips near the nose of the tile or a bead of adhesive between the tiles at the headlap should be specifed. 11-43
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Coastal Construction Manual Princip
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All illustrations in this document
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PREFACE Volume II Chapter 8 - Site-
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1 CHAPTER TITLE Contents COASTAL CO
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Volume II CONTENTS Chapter 9. Desig
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13 CONSTRUCTING THE BUILDING Volume
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14 MAINTAINING THE BUILDING Volume
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1 CHAPTER TITLE Acronyms COASTAL CO
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Volume II ACRONYMS H HMA Hazard Mit
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Volume II ACRONYMS T TMS The Masonr
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GLOSSARY Volume II Basement - Under
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GLOSSARY Volume II Conditions Great
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GLOSSARY Volume II F Federal Emerge
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GLOSSARY Volume II G Gabion - Rock-
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GLOSSARY Volume II Location - The l
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GLOSSARY Volume II O Open foundatio
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GLOSSARY Volume II Risk tolerance -
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GLOSSARY Volume II safe living cond
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GLOSSARY Volume II Z Zone A - Under
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INDEX Volume II Building envelope,
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INDEX Volume II stillwater flood de
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INDEX Volume II Floodborne debris d
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INDEX Volume II I IBHS (see Insuran
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INDEX Volume II date of constructio
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INDEX Volume II Seawall, 7-7, 7-17,
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INDEX Volume II velocity pressure,
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FEMA P55 Coastal Construction Manual, Fourth Edition - Mad Cad

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