How long does it take to insulate all the exterior walls in a 1,200 sq ft Bathurst bungalow with batt insulation?

For a typical 1,200 sq ft Bathurst bungalow, professional batt insulation of all exterior walls takes 1-2 days, while a skilled DIY homeowner should plan for 2-4 weekends depending on the complexity and their experience level.

The timeline depends heavily on whether you're working with an unfinished basement where the wall cavities are exposed, or if you're retrofitting finished walls. For unfinished basement walls and any exposed framing, professional installers can typically insulate 400-600 square feet of wall area per day with proper batt installation — cutting each piece precisely, ensuring no gaps or compression, and installing the vapour barrier correctly. A 1,200 sq ft bungalow typically has 800-1,000 square feet of exterior wall area depending on the floor plan.

Bathurst's harsh northern New Brunswick climate makes proper installation critical — your area sees some of the province's coldest temperatures and longest heating seasons, often accumulating over 5,200 heating degree days annually. This means any gaps, compression, or vapour barrier errors in your wall insulation will cost you significantly in heating bills and comfort. The installation must be meticulous because compressed batts lose much of their insulating value, and gaps allow cold air infiltration that makes rooms uncomfortable even with adequate R-values.

For retrofit work in finished walls, the timeline extends considerably because you'll need to remove interior drywall or exterior siding to access the wall cavities. Removing and replacing drywall adds 3-5 days to the project, while working from the exterior (removing siding) can add 4-7 days depending on siding type and weather conditions. Many Bathurst homeowners choose dense-pack cellulose wall retrofit instead — this method involves drilling small holes through the exterior siding and blowing insulation into the wall cavities at high density. Dense-pack installation typically takes just 1 day for the insulation work, though you'll still need to patch and paint the drill holes.

Key factors affecting timeline include the home's age and construction details. Many Bathurst homes built in the 1960s-1980s have 2x4 walls with minimal or no insulation, balloon framing that creates complex air sealing challenges, and electrical systems that require careful work around old wiring. Homes with stone or brick veneer, complex rooflines, or multiple dormers take longer due to irregular framing and difficult access areas.

Professional installation is strongly recommended for wall insulation in Bathurst's climate. Proper vapour barrier installation requires continuous 6-mil polyethylene with acoustical sealant at all edges, every seam carefully taped, and all electrical boxes and penetrations sealed. The consequences of moisture infiltration through poorly installed vapour barriers are severe in your cold climate — condensation leads to mould and rot that can remain hidden for years. Professional installers also have the experience to identify and address thermal bridging through studs, which reduces the effective R-value of even properly installed batts.

Budget 2-4 days for professional installation of batt insulation in exterior walls, or plan for several weekends if tackling this as a DIY project. Remember that wall insulation works best as part of a complete building envelope upgrade including attic insulation to R-50+, basement wall insulation, and comprehensive air sealing.

Need help finding a professional insulation contractor in the Bathurst area? New Brunswick Insulation can match you with experienced local professionals who understand northern NB's challenging climate conditions.