Insulate Sloped Ceiling of Original Building The sloped ceilings in the 3rd floor of the existing building have very little or no insulation. The floor area of this 3rd floor space is approximately 4,000 square feet. The existing sloped ceiling finish is a mixture of wood slats, and drywall over wooden slats. The intent of this project is to increase the R-value of this ceiling assembly and ultimately improve the energy efficiency of the building. 1. Materials a. Cellulose Insulation: Blown-In 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. 2. Installation a. Contractor shall inspect the attic space above the 3rd floor of the existing building to determine if the rafter bays of the sloped ceiling are accessible from above. If they are, insulation shall be installed from this access point. b. If the sloped ceiling is not accessible from the attic space, installation shall occur by carefully removing the historic ceiling boards and reinstalling them after insulation. If it is absolutely necessary to cut access holes into the historic ceiling material, the holes shall be patched with matching ceiling material and painted to match the existing color. Frequency and location of these access holes shall allow for R-value and density required to be met. Locations of access holes and proposed repairs after completion shall be reviewed and approved by the Owner prior to commencing the work. c. Contractor shall inspect spaces to receive insulation prior to installation to ensure they are acceptable. d. Contractor shall repair access holes after work is completed in a manner that has been approved by the Owner. e. Rafter bays shall be filled 100% with insulation, depth of bays is approximately 6”. f. Installed insulation shall have a settled density of approximately 1.5 lbs per cubic foot. g. Insulation shall be installed in accordance with manufacturer’s written instructions. Improve Air Sealing at Windows The windows present in the original portion of the building are wood framed with dual pane glass in fair condition, however exterior air infiltration was consistently present around window frames and trim. Interior window inserts are to be installed at these windows in the original building, and air sealing around the rough opening is to be completed to increase the R-value and reduce air infiltration. There is an estimated 800 SF of windows in the original building requiring these improvements, final quantity and sizing to be verified by Contractor. 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. b. Window & Door Polyurethane Foam Sealant i. Shall be a one component, minimal expanding, low pressure-build polyurethan foam sealant. ii. Shall be specified for use around windows and doors. iii. Basis of design is Great Stuff Pro Window and Door Polyurethane Foam Sealant. 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 the manufacturer’s written instructions. 3. Air Sealing at Existing Rough Openings a. Existing interior wood trim at the head, jambs, and sill of windows in the original building are to be removed by Contractor with minimal damage to the trim and surrounding finishes. b. After trim has been removed, the contractor shall install a release layer, such as plastic sheeting, in the rough opening so the sprayfoam does not contact the wood and can be removed in the future. Then, foam sealant is to be installed continuously in the existing rough opening between the building and window framing. Foam sealant is to extend full depth into the rough opening. c. After curing, any excess foam is to be trimmed flush by the Contractor. d. Original wood trim is then to be re-installed by Contractor. When complete nail holes shall be filled and any other damage to the trim or surrounding finishes caused by Contractor is to be repaired. Any trim pieces that are beyond repair are to be replaced by Contractor.
