1. Materials a. Graphite Polystyrene Insulation i. Shall have a minimum R-value of 5.0 at 1 inch when tested in accordance with ASTM C518 ii. Basis of design material is BASF Neopor F5000. Equal substitutions will be considered. b. Metal Flashing i. Shall be aluminum, preformed or field-formed, with an upper vertical leg (portion that underlaps siding and weather barrier) of at least 1.5”, a horizontal leg (portion that extends over top edge of insulation) of at least 3- 1/4” with a positive slope, and drip edge/kicker projecting away from the insulation. ii. Equal substitutions will be considered as long as water management over top of insulation is maintained. c. Finishes i. Stucco or parging finish to mimic the look of concrete, with base coat and reinforcing mesh d. Accessories i. Foam Board Adhesive (ex. Loctite PL 300) or mechanical fasteners with washers ii. 100% silicone sealant and closed cell backer rod iii. Fasteners/Adhesives (as recommended by flashing and finish manufacturer) iv. 3M 8067 All-Weather Tape (for counterflashing metal flashing) 2. Installation a. Existing foundation surface and surrounding finishes shall be properly prepared and/or removed as necessary to accept insulation, flashing, and finishes. Finish materials removed shall be salvaged to the extent possible in instances where salvaging materials is more cost-effective than replacement. On the south elevation, there is a stucco parge coat over CMU block that is beginning to deteriorate. Removal may be necessary prior to application of new insulation. b. From the exterior excavate into the soil/gravel around the foundation and expose 12 to 18” of the below-grade foundation wall, or as deep as possible if this depth cannot be obtained. Wash off the soil and allow the walls to dry completely. c. Remove trim at base of wall to the extent necessary to install aluminum flashing. i. Vertical leg of aluminum flashing should underlap trim as well as any weather barrier/building wrap, if present. If no weather barrier/building wrap is present and access allows, counterflash the leading edge of the metal flashing with a weather-barrier self-adhesive tape. ii. The horizontal leg of the flashing should sit just below the bottom edge of trim, with 1/8-1/4” gap. Bend the horizontal leg downward slightly, if necessary to create a positive slope. Reinstall trim and fasteners. iii. Overlap butt ends of flashing 3” minimum and bed in sealant. d. Adhere 3” thickness of rigid graphite polystyrene (GPS) foam board to the foundation with foam board adhesive per manufacturer’s instructions. Mechanical fastening with washers is also an acceptable method. Set the insulation from the bottom of the trench up to the top of the foundation. If insulation is to be installed in 2 layers, stagger layers 6” in both directions. Insulation should terminate close to the underside of the flashing but maintain a slight gap (approx. ¼”) so that it does not press against the flashing and create a negative slope. e. Cover the above grade GPS insulation with stucco and reinforced base coat or fiberglass reinforced plastic finish, following AWCI best practices (for stucco and reinforcing mesh) and manufacturer’s installation instructions. f. Backfill the trenches in the soil and replace gravel drip bed. Attic Air Sealing & Insulation The energy assessment report revealed that there is lack of a dedicated air barrier across the attic floor and the connection of the attic into the balloon framing cavities creates significant air bypasses. Further, current insulation R-values are below today’s code minimums. The intent of this scope is to start fresh with a whole-attic air sealing approach and replacement of insulation to codeminimum levels. Please note that the attic entails a flat cold attic area and enclosed roof framing cavities on either side, extending down to the eaves. The curvature of the finish ceiling makes it so that it does not contour with the anticipated structural rafters above it, creating uncertainty about the space between the ceiling and rafter edges. This should be reviewed by bidding contractors during the pre-bid meeting, particularly Installation scope items ‘C’ through ‘G’ below. Any modifications necessary to the below scope of work to establish better air barrier and thermal barrier continuity should be identified in proposals. 1. Materials a. Foamed-In-Place Insulation: Closed cell polyurethane foam. i. Shall have a minimum R-value of 6.0 at 1 inch thickness when tested in accordance with ASTM C518. ii. Shall utilize a blowing agent of water or non-ozone-depleting gas. iii. Shall have a maximum air permeance of 0.02 cfm per square foot when tested in accordance with ASTM E2178. iv. Basis of design material is Carlisle Spray Foam Insulation; Sealtite Pro HFO. Equal substitutions will be considered. b. Cellulose Insulation: Loose-fill and Dense-pack i. Shall have a minimum R-value of 3.7 at 1 inch thickness when tested in accordance with ASTM C518. ii. Basis of design material is Igloo; Cellulose. Equal substitutions will be considered. c. Rigid Board Insulation (for attic hatch and framing cavity plugs) d. Accessories i. ¾” Plywood ii. Foil Tape iii. Foam Board Adhesive iv. Wood Trim v. 100% Clear Silicone Sealant vi. Self-Adhered ½” Closed-Cell Foam Gasket vii. One-Component Can-Foam viii. Finish Paint 2. Installation a. All existing cellulose and debris is to be removed from the attic floor and disposed of by the Contractor. Access into the sloped ceiling cavities and verification of air sealing and insulation strategy there should be verified at this time. Any modifications required should be submitted to the Owner before proceeding. b. Replace Attic Hatch i. Existing hatch panel is to be removed but salvaged for reuse. Remove any existing insulation and clean attic side of panel surface. ii. Caulk-seal wood trim around perimeter of hatch opening on all 4 sides including gat corner miter joints. iii. Install self-adhered closed-cell foam gasketing on the attic side of the trim lip, taking care to ensure surfaces are clean and gasket joints are tight, without gaps that would allow air to bypass.
