Exterior Door Replacement The Fire Station has three (3) exterior person doors, each approximately 80” tall by 36” wide, that are in poor condition and shall be replaced. 1. Materials a. Insulated Steel Pre-Hung Exterior doors i. Basis of design is an opaque Jeld-Wen steel prehung Front Door. Equal substitutions will be considered. These doors are within masonry openings, so welded metal frames may be required. ii. Doors shall have a maximum U-Factor 0.15, equivalent to R-6.7. iii. Hardware type and finish, interior finish, and exterior finish to be approved by Owner prior to ordering. b. Door Accessories i. All door installation accessory materials including but not limited to flashing tape, flashing membrane, sealants, and fasteners shall be in compliance with manufacturer’s written instructions. 2. Installation a. Existing exterior person doors and frames shall be removed and disposed of by the Contractor. b. Door and frame sizes shall be measured by contractor to fit in existing rough openings. c. Rough opening framing shall be inspected and confirmed acceptable prior to door installation. Any framing at the door opening in poor condition shall be replaced prior to installation. d. Doors and frames shall be installed level, plumb, square, and in accordance with manufacturer’s written instructions. Air sealing and water management practices shall also be installed per manufacturer’s instructions. e. After complete door installation, interior wooden trim shall also be installed. Finish to be approved by Owner. Air Seal and Insulate Attic Hatch The current attic hatch is not insulated or weather-stripped, resulting in excess heat loss via conductivity and air exfiltration. The intent of this scope is to build a new hatch that is effectively insulated and air sealed. 1. Materials a. Foil-Faced Polyisocyanurate Insulation i. Shall have a minimum R-value of 6.5 at 1 inch when tested in accordance with ASTM C1289 and C518 ii. Basis of design material is DuPont Tuff-R 2” Polyisocyanurate. Equal substitutions will be considered. b. 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. Finish Paint 2. Installation a. Existing hatch panel and perimeter trim is to be removed and disposed of by the Contractor. b. Install new wood trim around perimeter of hatch opening and create a continuous perimeter lip that can support a hatch panel on all 4 sides. c. 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. d. Using clear silicone sealant, caulk the perimeter of the wood trim to the surrounding ceiling. Include sealant at corner miters joints. Tool sealant in place. e. Build an insulated hatch panel that fits the hatch opening: i. A hatch panel made of ¾” should be cut to size to fit the hatch opening. The panel should rest comfortably on the gasketed lip and make contact with the foam gasket on all 4 sides. The panel should not bind against surrounding framing when lifting or replacing. ii. Adhere 4” (2-2” layers) of foil-faced polyisocyaurate to the attic side of the hatch panel. Insulation should be flash with the plywood on all 4 sides, creating a completely insulated panel. iii. Install foil-tape over the exposed foam edges to provide protection and reduce foam deterioration during use. iv. Paint trim and hatch panel in white, if desired by owner. Interior Window Inserts The Fire Station has (3) windows measuring 32”x32” which are single pane windows with low Rvalue and are assumed to be allowing air leakage/infiltration. Interior inserts are to be installed to increase the R-value and improve air sealing. 1. Materials a. Custom Interior Window Inserts i. Window inserts are to be custom sized to fit in the existing window openings without modifications to the existing framing or trim. ii. Inserts shall have 1/8” thick acrylic glazing. iii. Shall be edged with compression silicon or neoprene tubing to create a tight perimeter seal. iv. Insert color to be approved by Owner. v. Basis of design is Standard Grade Interior Storm Windows by Indow. Equal substitutions will be considered. 2. Installation of Interior Window Inserts a. Contractor is responsible for measuring each window opening to verify sizing prior to ordering. b. Existing window framing/sills are to be inspected and repaired as needed prior to field measuring for inserts. c. When installed, inserts shall create a tight seal around the perimeter with no visible gaps or voids. d. Inserts are to be compression-fit with no fasteners and shall be installed in accordance with manufacturer’s written instructions.
