Weatherproof Protection. Better Efficiency. Stronger Building Envelope.
Start ProjectOttawa’s changing weather puts constant pressure on a home’s exterior walls. House wrap adds a protective layer behind the siding, helping manage moisture and unwanted air movement while supporting the building envelope. Proper installation is essential to its performance.
Big City Roofing approaches house wrap installation as part of a complete exterior system, coordinating wall protection with siding and other components.
Why it matters?
House wrap helps protect exterior walls from wind-driven rain while managing unwanted air movement. When properly installed, it supports moisture control, energy efficiency and overall building-envelope performance — especially important in Ottawa’s variable climate.
Core benefits
Transparent workflow
We treat house wrap as a critical part of the building envelope, with every detail planned for reliable moisture and air control.
We assess the exterior walls, existing materials and vulnerable areas before work begins.
We correct unsuitable or damaged areas to provide a sound base for installation.
The membrane is installed with controlled overlaps, secure fastening and continuous coverage.
Seams, penetrations, corners and transitions are carefully sealed to maintain continuity.
Openings are detailed to connect the house wrap with surrounding weather-resistant components.
We verify coverage, fastening, seams and critical transitions before exterior finishing begins.
The big city standard
A house wrap installation is only as effective as the detailing behind it. We focus on continuity, proper integration and workmanship that supports the entire building envelope.
We understand how house wrap works with cladding, flashing, windows and other exterior components.
We use quality weather-resistant membranes suited to the project and local climate conditions.
Correct overlaps, fastening and sealing help manage bulk water and uncontrolled air movement.
Windows, doors, corners and penetrations receive particular attention to maintain continuous protection.
We explain the scope, materials and installation approach before work begins, with straightforward communication throughout the project.
We protect surrounding areas, maintain an organized site and inspect completed work before exterior finishing proceeds. The result is a properly integrated weather-resistant layer designed to support durable exterior performance.
Enter your phone number to book a site inspection or get expert advice on your exterior.
House wrap is more than a layer hidden behind siding. In Ottawa, exterior walls face rain, snow, wind, freeze-thaw cycles and seasonal temperature changes, making the weather-resistant layer an important part of the wall assembly.
For homeowners, the key question is not simply what is house wrap, but whether it is selected and installed correctly. Properly detailed exterior house wrap helps control rainwater behind the cladding and supports building envelope performance.
House wrap is a weather-resistant membrane installed behind exterior cladding. Its primary job is to provide a drainage plane that helps prevent rainwater from reaching the wall sheathing and framing.
So, what is the purpose of house wrap? It helps:
The Building America Solution Center describes house wrap as a water-control layer behind siding that should connect with flashing to create a continuous drainage path.
A common question is, is house wrap waterproof? Quality membranes resist bulk water while allowing the wall assembly to manage moisture. However, house wrap does not replace properly installed siding, flashing or other water-management details.
Water can enter around windows, doors and vents when these areas are poorly detailed, so the membrane must be properly integrated with each penetration.
Professional house wrap installation depends heavily on sequencing and detailing. The membrane should create continuous protection, with overlaps and transitions arranged so water drains outward rather than behind the wall system.
Particular attention is needed for house wrap around windows. Window and door openings interrupt the wall assembly and require carefully coordinated flashing and membrane details. Technical guidance recommends integrating the weather-resistant barrier with head, jamb and sill flashing.
This is where workmanship matters most. A technically suitable membrane can perform poorly when seams, penetrations or transitions are left vulnerable.
For house wrap in Canada projects, material selection and detailing should reflect the building assembly and local climate rather than follow a one-size-fits-all approach.
Ottawa homes vary considerably, so a detached home, renovation, older siding system or modern high-performance wall may require different detailing.
CMHC emphasizes continuity of the building-envelope air barrier and careful installation, as uncontrolled air leakage can contribute to heat loss and moisture problems within wall assemblies.
One distinction is important: house wrap primarily manages exterior water, while the complete building envelope also includes air, vapour and thermal control layers. These functions must work together.
A house with wrap around porch has additional exterior transitions where walls, rooflines and porch structures meet. The same applies to a traditional wrap around porch house or a renovation involving it. These areas deserve careful inspection because architectural projections can create more joints and penetrations.
The goal is not to add more material everywhere. It is to create a continuous, properly drained and carefully sealed exterior wall system.
Part of the Building Envelope. Big City Roofing treats house wrap as part of the complete building envelope, not an isolated installation. The process includes assessing the wall, preparing the surface, installing the membrane with proper overlaps, detailing openings and checking critical transitions before exterior finishing.
Why Proper Installation Matters. Because house wrap is hidden behind siding, installation problems can be difficult to detect later. They are best addressed before the wall is closed, rather than after moisture damage appears.
Professional Assessment for Ottawa Homes. For Ottawa homeowners planning siding replacement or exterior renovations, a professional assessment can determine whether the existing weather-resistant layer is adequate and where improvements are needed.
Common inquiries
Everything you need to know about our process, materials, and standards before we start.
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