Special Applications and Building Type. Special precautions are required for buildings with high indoor humidities or spaces with sensitive

Transcription

1 Special Applications and Building Type. Special precautions are required for buildings with high indoor humidities or spaces with sensitive electronic equipment or artifacts. These include swimming pools, ice rinks, cold storage, computer rooms, libraries, hospitals, nursing homes, museums, and some manufacturing facilities. Low permeance vapor retarders are often needed to separate indoor swimming pools or other special applications from the rest of the building. Details. Figures.3.21 through 31 provide conceptual details on how to construct the precast concrete system to achieve energy savings while providing an air barrier and reducing the potential for moisture problems. The recommendations and details presented are based on specific analyses, engineering judgment, and best available practices at the time of publication. Performance testing of the details has not been performed. Detail drawings are provided in order to assist competent professionals in the detailing of the building insulation envelope. Reinforcing designations, structural connections, wythe thickness, and insulation indicated in drawings are to be used for reference only and are not intended to substitute for project specific judgment. Water Leakage. The exterior surface of the precast concrete system acts as a weather barrier to prevent rain and snow from entering the building. As shown in Figs and 22, joints in the precast concrete generally have either two layers of sealant, or sealant and a secondary method of defense against water penetration. Joints around windows, doors, and other penetrations through the precast concrete building are designed with a primary and secondary method of defense against rainwater penetration. Floor Systems. The provided details are for a double tee floor system. Details for hollow core floor systems will be similar, including insulation requirements. The main concept is to separate the floor slabs from the exterior concrete by insulation to reduce thermal bridges. This will reduce energy losses and the potential for condensation and moisture problems. Figures.3.23 and 24 present two options for insulating floors above unconditioned spaces such as parking structures. In these cases the concrete floor acts as a semi-impermeable vapor retarder. Figure.3.23 with rigid insulation is preferable. If spray-on or batt insulation are used as shown in Fig..3.24, it should be wrapped around the precast concrete stems.

2 Backer Rod and Sealant Moisture resistant, fire rated expandable polyurethane foam in-place insulation Exterior Surface Backer Rod and Sealant (if access to interior is not available, install from accessible side) Painted Gypsum Wallboard with airspace, if desired A Sandwich Wall Backer Rod and Sealant Exterior Surface Backer Rod and Sealant (if access to interior is not available, install from accessible side) Painted Gypsum Wallboard with required insulation B with Rigid Insullation Backer Rod and Sealant Exterior Surface Backer Rod and Sealant (if access to interior is not available, install from accessible side) Painted Gypsum Wallboard with required insulation Fig Typical spandrel/column detail Option A. C with Batt Insullation

3 Backer Rod and Sealant Vapor Retarder rolled and pushed in joint or foam insulation Exterior Surface Moisture resistant, fire rated expandable polyurethane foam in-place insulation Painted Gypsum Wallboard with airspace, if desired A Sandwich Wall Backer Rod and Sealant Exterior Surface Moisture resistant, fire rated expandable polyurethane foam in-place insulation Painted Gypsum Wallboard with required insulation B with Rigid Insulation Backer Rod and Sealant Exterior Surface Vapor Retarder rolled and pushed in joint or foam insulation Painted Gypsum Wallboard with required insulation Fig Typical spandrel/column detail Option B. C with Batt Insulation

4 OFFICE Rigid Insulation (if not relying on composite action)* IECC Zone Min. R-Value 1 None 2, 3 R 4,, 6 R10 7, 8 R1 * NOTE: Add topping slab below insulation for composite action PARKING (1) Layer /8-in. type X M.R. gypsum board on grid system OFFICE Rigid Insulation (if not relying on composite action)* IECC Zone Min. R-Value 1 None 2, 3 R 4,, 6 R10 7, 8 R1 A Sandwich Wall (1) Layer /8-in. type X M.R. gypsum board on grid system PARKING OFFICE Rigid Insulation (if not relying on composite action)* IECC Zone Min. R-Value 1 None 2, 3 R 4,, 6 R10 7, 8 R1 B with Rigid Insulation (1) Layer /8-in. type X M.R. gypsum board on grid system PARKING (See Fig..3.2 for / insulation} C with Batt Insulation Fig Typical floor detail rigid insulation.

5 OFFICE (1) Layer /8-in. type X M.R. gypsum board on grid system PARKING Spray-on or Batt Insulation IECC Zone Min. R-Value of added insulation 1 None 2, 3, 4,, 6 R11 7, 8 R1 OFFICE A Sandwich Wall PARKING (1) Layer /8-in. type X M.R. gypsum board on grid system Spray-on or Batt Insulation IECC Zone Min. R-Value of added insulation 1 None 2, 3, 4,, 6 R11 7, 8 R1 OFFICE B with Rigid Insulation (1) Layer /8-in. type X M.R. gypsum board on grid system PARKING Spray-on or Batt Insulation IECC Zone Min. R-Value of added insulation 1 None 2, 3, 4,, 6 R11 7, 8 R1 (See Fig..3.2 for / insulation} C with Batt Insulation Fig Typical floor detail alternate batt insulation.

6 Building Felt JT. Sealant Furring and Gypsum Wallboard, as desired A Sandwich Wall Moisture resistant, expandable polyurethane foam in-place insulation JT. Sealant Moisture resistant, expandable polyurethane foam in-place insulation Rigid Installation, Furring and Gypsum Wallboard as required B with Rigid Insulation JT. Sealant Batt Installation, Metal Framing and Gypsum Wallboard as required C with Batt Insulation Fig..3.2 Typical non-loadbearing spandrel/ detail.

7 Backer Rod and Sealant Glass Backer Rod and Sealant Flashing or Slope Shelf Outward /8-in. thick moisture resistant gypsum wallboard Insulation R2 rigid insulation (min.), wood or composite wood block in IECC Zones 4 7 Z furring or metal framing to create 1-in. minimum air space /8-in. thick gypsum wallboard painted (optional) A Sandwich Wall Glass Backer Rod and Sealant Flashing or Slope Shelf Outward Backer Rod and Sealant /8-in. thick moisture resistant gypsum wallboard or other sill material R2 rigid insulation (min.), wood or composite wood block in IECC Zones 4 7 Z furring or metal framing to create 1-in. minimum air space /8-in. thick gypsum wallboard painted Rigid or semi-rigid insulation, continuous and taped at joints, as required B with Rigid Insulation Glass Backer Rod and Sealant Flashing or Slope Shelf Outward Backer Rod and Sealant /8-in. thick moisture resistant gypsum wallboard or other sill material R2 rigid insulation (min.), wood or composite wood block in IECC Zones 4 and 1-in. minimum air space /8-in. thick gypsum wallboard painted Batt insulation in metal framing as required Only applicable for IECC Zones 1 C with Batt Insulation Fig Typical window sill detail.

8 Acoustical Ceiling Insulation Z furring or metal framing to create 1-in. minimum air space Drip Edge R2 rigid insulation (min.), wood or composite wood block in IECC Zones 4 7 /8-in. thick gypsum wallboard, painted (optional) A Sandwich Wall Z furring or metal framing to create 1-in. minimum air space Rigid insulation, continuous and taped at joints, as required Acoustical Ceiling Drip Edge R2 rigid insulation (min.), wood or composite wood block in IECC Zones 4 7 /8-in. thick gypsum wallboard, painted 1-in. minimum air space B with Rigid Insulation Batt insulation in metal framing as required Acoustical Ceiling R2 rigid insulation (min.), wood or composite wood block in IECC Zones 4 and Drip Edge /8-in. thick gypsum wallboard painted Only applicable for IECC Zones 1 C with Batt Insulation Fig Typical window head detail.

9 Building Felt Topping Spot corbel or ledge A Sandwich Wall At Web, Flange and Floor: Fill space between precast web, flange, floor and exterior wall with mosture resistant, foam in-place expandable polyurethane insulation Topping BEtWEEN Web and CORBEL: Extend insulation and gypsum wallboard to bottom of precast concrete flange Spot corbel or ledge Wrap corbel with required rigid insulation and /8-in. thick gypsum wallboard B with Rigid Insulation At Web, Flange and Floor: Fill space between precast web, flange, floor and exterior wall with mosture resistant, foam in-place expandable polyurethane insulation BEtWEEN Web and CORBEL: Extend insulation and gypsum wallboard to bottom of precast concrete flange Topping For Sections B & C corbel insulation IECC Zone Min. R-Value of Added Insulation 1, 2 None 3B None 3A (Below Warm Humid Line ) None 3A (Above Warm Humid Line ) R7. 3C, 4A, 4B R7. 4C,, 6* R10 7 R12. *Not Applicable for Section C Spot corbel or ledge Wrap corbel with required rigid insulation and /8-in. thick gypsum wallboard C with Batt Insulation Fig Typical loadbearing spandel with corbel/ detail.

10 Building Felt Topping Varies Spot corbel or ledge Ledge A Sandwich Wall At Web, Flange and Floor: Fill space between precast web, flange, floor and exterior wall with mosture resistant, foam in-place expandable polyurethane insulation BEtWEEN Web and CORBEL: Extend insulation and gypsum wallboard to bottom of precast concrete flange Topping Spot corbel or ledge Varies Wrap corbel with required rigid insulation and /8-in. thick gypsum wallboard Ledge B with Rigid Insulation At Web, Flange and Floor: Fill space between precast web, flange, floor and exterior wall with mosture resistant, foam in-place expandable polyurethane insulation BEtWEEN Web and CORBEL: Extend insulation and gypsum wallboard to bottom of precast concrete flange Ledge Topping Spot corbel or ledge Varies For Sections B & C corbel insulation IECC Zone Min. R-Value of Added Insulation 1, 2 None 3B None 3A (Below Warm Humid Line ) None 3A (Above Warm Humid Line ) R7. 3C, 4A, 4B R7. 4C, R10 Wrap corbel with required rigid insulation and /8-in. thick gypsum wallboard C with Batt Insulation Fig Typical loadbearing spandrel with corbel /dapped detail.

11 Building Felt topping slab Pocketed A Sandwich Wall Fill space between precast web, floor and exterior wall with mosture resistant, foam in-place expandable polyurethane insulation Pocketed topping slab Fill pocket with required insulation in IECC Zones 3 7 Extend required insulation and gypsum wallboard to bottom of precast concrete flange B with Rigid Insulation Pocketed Fill space between precast web, floor and exterior wall with mosture resistant, foam in-place expandable polyurethane insulation topping slab Fill pocket with required insulation in IECC Zones 3, 4, and Extend required insulation and gypsum wallboard to bottom of precast concrete flange C with Batt Insulation Fig Typical pocketed loadbearing spandrel / detail.

12 EPDM Membrane, Follow National Roofing Contractors Association Recommended Details EPDM Membrane, Follow National Roofing Contractors Association Recommended Details Roof Membrane on Tapered Rigid Insulation Roof Membrane on Tapered Rigid Insulation Sealed Joint Sealed Joint OR A Sandwich Wall A Sandwich Wall EPDM Membrane, Follow National Roofing Contractors Association Recommended Details Roof Membrane on Tapered Rigid Insulation Sealed Joint Mosture resistant, fire rated foam in-place expandable polyurethane insulation Rigid Insulation, Continuous & Taped at Joints, as required B with Rigid Insulation EPDM Membrane, Follow National Roofing Contractors Association Recommended Details Roof Membrane on Tapered Rigid Insulation Sealed Joint Mosture resistant, fire rated foam in-place expandable polyurethane insulation Batt Insulation in Metal Framing, as required C with Batt Insulation Fig Typical roof parapet detail.