Hurricane IDA Repairs to Larose Cut Off Middle School (Phase I Reroofing)

This project entails the reroofing of Building #01A, #01B, #03A, #03B, #04, #05, and #07 at Larose / Cut Off Middle School. The existing roofs consist of standing seam metal, built-up roof with gravel surface and modified bitumen roof system. 2. The following is a description of Roof #01A along with core sample information: a. Cores of Existing Roof (LCO Site #320, Building #01A two (2) story classroom building) 1. Deck is steel. 2. Substrate is lightweight insulated concrete. 3. Base sheet is ASTM 4601, Type II fiberglass 4. Roof is 2 ply SBS Modified Bitumen b. New Roof (Code requirement – Resist 164 mph wind uplift. A new roof to resist 170 mph wind uplift will be the design pattern. (Wind-load analysis is in 10’s, example: 160 wind uplift, 170 wind uplift.) 1. Existing steel deck will remain. 2. Existing substrate will remain, lightweight insulated concrete with new lightweight insulated concrete patching where damaged. 3. Base sheet will be new ASTM 4601, Type II, fiberglass mechanically fastened to existing lightweight insulated concrete. 4. No Additional Insulation 5. Roof will be new two (2) Ply SBS Modified Bitumen, torch applied over base sheet. 3. The following is a description of Roof #01B: a. Existing Roof – Standing seam metal. (LCO Site 320, Building #01B gymnasium roof.) 1. Existing steel deck supported by steel structure. 2. Existing ¾” fiberglass rigid insulation board mopped to existing steel deck. 3.Existing mopped in BUR with gravel over existing ¾” rigid insulation. 4. Existing 2” x 4” wood runners spaced 4’- 0” o.c. and anchored through roofing materials to existing steel deck. Existing 1-1/2” polyisocyanurate fill board between each 2” x 4” wood runners. 5. Existing 24 gauge metal roof with 1-1/2” standing seam spaced 16” o.c. b. New Roof – Standing seam metal. Resist 164 mph wind uplift. A new roof to resist 170 mph will be the design criteria.) 1. New base sheet is ASTM 4601, Type II fiberglass loosely laid over existing steel deck where torn off. 2. New 1” Polyisocyanurate rigid insulation board mechanically fastened through new loosely laid base sheet and into existing steel deck. 3. New layers, as necessary, of roofing felts to bring the level of new felts even with the existing BUR elevation. 4. Cut the ends of existing 2” x 4” damaged wood runners that run over existing BUR roof system and don’t replace. Add new 2”x4” wood runners at edge of eave and rake where missing. 5. The contractor shall salvage existing 1-1/2” polyisocyanurate fill board and reuse between existing 2”x4” wood runners remaining and the remaining area of the roof. 6. When out of existing 1-1/2” polyisocyanurate fill boards, install new 1-1/2” polysocyanurate. 7. Last, install 24 gauge 1-1/2” standing seam metal roof with rib spacing of 12” o.c mechanically fastened through roofing system and penetrate bottom side of existing/new roof deck a min. of ¾”. 4. The following is a description of Roof #03A along with core sample information: a. Cores of Existing Roof (LCO Site #320, Building #03A high roof over the cafeteria) 1. Existing deck is steel. 2. Existing substrate is lightweight insulated concrete. 3. Existing base sheet is ASTM 4601, Type II fiberglass. 4. Existing roof is 2 ply SBS Modified Bitumen b. New Roof (Code requirement) – Resist 164 mph wind uplift. A new roof to resist 170 mph wind uplift will be the design pattern. (Wind-load analysis is in 10’s, example: 160 wind uplift, 170 wind uplift.) 1. Existing steel deck will remain. 2. Existing substrate will remain, Lightweight insulated concrete with new lightweight insulated concrete patching where damaged. 3. Base sheet will be new ASTM 4601, Type II, fiberglass mechanically fastened to existing lightweight insulated concrete. 4. No additional Insulation 5. Roof will be new two (2) Ply SBS Modified Bitumen, torch applied over base sheet. 5. The following is a description of Roof #03B along with core sample information: a. Cores of Existing Roof (LCO Site #320, Building #03B low roof over the Special Ed. Classrooms and attached to cafeteria.) 1. Existing deck is steel. 2. Existing insulation is +/-2-1/2” polyisocyanurate. 3. Existing cover panel is +/-½” DensDeck Prime. 4. Existing roof is 2 ply SBS Modified Bitumen. b. New Roof (Code requirement – Resist 164 mph wind uplift. A new roof to resist 170 mph wind uplift will be the design pattern. (Wind-load analysis is in 10’s, example: 160 wind uplift, 170 wind uplift.) 1. Existing steel deck will remain. 2. Install 2-1/2” insulation to replace existing damaged insulation. Insulation will be new ASTM C 1289, Type II, Class 1, Grade 2, 20 psi Polyisocyanurate rigid, loosely laid over existing steel deck. 3. Roof cover panel will be new ½” Storm X DensDeck Prime and shall be mechanically fastened through all loosely laid material down to the existing steel deck. 4. Roof will be new two (2) Ply SBS Modified Bitumen, torch applied over DensDeck Prime. 6. The following is a description of Roof #04 (A few standing seam metal panels were damaged at the southern rake of the roof with adjacent panel standing seams damaged due to debris running across roof.): a. Existing Roof – Standing seam metal. (LCO Site 320, Building #04 Library roof.) 1. Existing steel deck supported by steel structure. 2. Existing possibly Polyisocyanurate insulation board fastened to existing steel deck. 3. Existing 24 gauge metal roof with 1-1/2” standing seam spaced 16” o.c. b. New Roof – 24 gage standing seam metal, at areas damaged, to match existing finish of existing standing seam roof. Resist 164 mph wind uplift. A new roof to resist 170 mph will be the design criteria.) 7. The following is a description of Roof #05 along with core sample information: a. Cores of Existing Roof (LCO Site #320, Building #05, one (1) story, Bulldog Base) 1. Deck is pre-cast concrete panels. 2. Substrate is lightweight insulated concrete. 3. Base sheet is ASTM 4601, Type II fiberglass 4. Insulation is 7/8” rigid fiberglass board. 5. Roof is Coal Tar BUR with Gravel Surface. b. New Roof (Code requirement – Resist 164 mph wind uplift. A new roof to resist 170 mph wind uplift will be the design pattern. (Wind-load analysis is in 10’s, example: 160 wind uplift, 170 wind uplift.) 1. Existing Pre-cast concrete panels will remain. 2. Existing substrate will remain, Lightweight insulated concrete with new lightweight insulated concrete patching where damaged. 3. Base sheet will be new Irex 40, ASTM 6163, Type I, mechanically attached to existing lightweight insulated concrete. 4. Install 1” insulation to replace existing damaged insulation. Insulation will be new ASTM C 1289, Type II, Class 1, Grade 2, 20 psi Polyisocyanurate rigid, adhered to new Irex 40 base sheet. 5. Roof cover panel will be new ½” Storm X DensDeck Prime and shall be adhered to 1” polyisocyanurate insulation. 6. Roof will be new Parapro Liquid Applied roof over Probase SBS adhered membrane. (Existing roofing system was warrantied for ponding water. The new Parapro Liquid Applied does warranty ponding water and would be equivalent to the existing roof system.) 8. The following is a description of Roof #07: a. Existing Roof (LCO Site #320, Building #07 mechanical building roof.) 1. Deck is steel. 2. Insulation is 7/8” fiberglass, mopped in. 3. Roof is unknown. The roof was completely blown off and emergency temporary roof was installed. (It is believed that the existing roof was a cold tar pitch with gravel roof.) b. New Roof (Code requirement – Resist 164 mph wind uplift. A new roof to resist 170 mph wind uplift will be the design pattern. (Wind-load analysis is in 10’s, example: 160 wind uplift, 170 wind uplift.) 1. Existing steel deck will remain. 2. Install 1” insulation to replace existing damaged insulation. Insulation will be new ASTM C 1289, Type II, Class 1, Grade 2, 20 psi Polyisocyanurate rigid, loosely laid over existing steel deck. 3. Roof cover panel will be new ½” Storm X DensDeck Prime and shall be mechanically fastened through all loosely laid material down to the existing steel deck. 4. Roof will be new Parapro Liquid Applied roof over Probase SBS adhered membrane. (Existing roofing system was warrantied for ponding water. The new Parapro Liquid Applied does warranty ponding water and would be equivalent to the existing roof system.) 9. A new wood gymnasium floor shall be installed at Building #01B

Division 07 -

Thermal and Moisture Protection, Dampproofing and Waterproofing, Thermal Protection.